Calm3

UniProt ID: P0DP28
Organism: Mus musculus
Review Status: COMPLETE
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Gene Description

Calmodulin-3 is one of three mouse calmodulin genes (Calm1, Calm2, Calm3) that all encode the same 149 aa calcium sensor protein. Calm3 is the most brain-enriched of the three paralogs, with high expression in hippocampus, cerebellum, and neurons generally, though the protein is broadly expressed. Because all three mouse calmodulin genes produce an identical protein, ISO transfers from human CALM1 (P0DP25) — the ortholog source used in GO_REF:0000119 — are biochemically valid; the protein sequences are 100% identical. ISO transfers from rat calmodulin paralogs (GO_REF:0000096) similarly reflect identical protein biology. The key ISO-review question is therefore not sequence divergence but whether rat or human paralog-sourced annotations add locus-specific signal or merely distribute family-wide annotations across all three mouse Calm genes. Core calcium-sensor functions (EF-hand binding, CaMKII/calcineurin activation, and ion channel regulation) transfer appropriately and are accepted; spindle/centrosome annotations are retained as non-core contexts. Tissue-restricted terms (synaptic, cardiac-specific signaling, sarcomere, growth cone) are kept as non-core with exceptions: Calm3 has a unique post-transcriptional regulatory feature — the long Calm3 isoform (Calm3L) contains a retained intron in its 3-UTR that recruits Staufen2 (Stau2) and drives activity-dependent localization of Calm3 mRNA specifically to neuronal dendrites (PMID:28765142). This mechanism is absent for Calm1 and Calm2. Stau2 iCLIP in E18 mouse brain showed Calm3 as the top retained-intron Stau2 target (0.24% of all tags), while Calm1/Calm2 lack crosslink clusters. NMDA stimulation promotes and synaptic silencing reduces this dendritic targeting. This supports a Calm3-specific mRNA-localization mechanism, but does not by itself demonstrate Calm3 protein localization to the postsynaptic cytosol, so postsynaptic-cytosol annotations are treated as specialized non-core context. The calyx-of-Held and presynaptic-endocytosis annotations (PMID:31628181) derive from Calm2-knockout experiments, not Calm3, and are treated accordingly. Calm3-specific interaction evidence also exists for RYR1, RYR2, SYT7, and IQCF1 (PubMed:18650434, 24569478, 25380116).

Existing Annotations Review

GO Term Evidence Action Reason
GO:0005737 cytoplasm
IBA
GO_REF:0000033 		ACCEPT
Summary: Primary cytoplasmic localization shared by all calmodulin proteins
Reason: Core calmodulin function or localization
GO:0005509 calcium ion binding
IBA
GO_REF:0000033 		ACCEPT
Summary: Core calcium-binding function through 4 EF-hand domains; identical protein to CALM1/2/3
Reason: Core calmodulin function or localization
GO:0005634 nucleus
IBA
GO_REF:0000033 		KEEP AS NON CORE
Summary: Nuclear localization is established for calmodulin but is context-specific; not a universal Calm3-defining localization
Reason: Tissue-specific or specialized function
GO:0010880 regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
IBA
GO_REF:0000033 		ACCEPT
Summary: Regulates RyR-mediated calcium release from SR; supported by direct evidence for RYR1/RYR2 interaction (PMID:18650434)
Reason: Core calmodulin function or localization
GO:0005513 detection of calcium ion
IBA
GO_REF:0000033 		ACCEPT
Summary: Core calcium sensing function; canonical calmodulin activity
Reason: Core calmodulin function or localization
GO:0097720 calcineurin-mediated signaling
IBA
GO_REF:0000033 		ACCEPT
Summary: Activates calcineurin phosphatase for NFAT-pathway signaling; broadly conserved calmodulin function
Reason: Core calmodulin function or localization
GO:0005813 centrosome
IBA
GO_REF:0000033 		KEEP AS NON CORE
Summary: Centrosomal localization for cell division
Reason: Tissue-specific or specialized function
GO:0043209 myelin sheath
IBA
GO_REF:0000033 		KEEP AS NON CORE
Summary: CaM localizes to myelin via MBP interaction (PMID:19855925) but represents neural-specific context
Reason: Tissue-specific or specialized function
GO:0000086 G2/M transition of mitotic cell cycle
IEA
GO_REF:0000117 		KEEP AS NON CORE
Summary: Cell cycle regulation at G2/M transition; supported by direct IDA evidence for calmodulin but not a core Calm3 molecular function
Reason: Tissue-specific or specialized function
GO:0000922 spindle pole
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Spindle pole localization during mitosis
Reason: Tissue-specific or specialized function
GO:0005509 calcium ion binding
IEA
GO_REF:0000120 		ACCEPT
Summary: Core calcium-binding function; redundant with IBA but consistent
Reason: Core calmodulin function or localization
GO:0005819 spindle
IEA
GO_REF:0000044 		KEEP AS NON CORE
Summary: Spindle localization for cell division
Reason: Tissue-specific or specialized function
GO:0006897 endocytosis
IEA
GO_REF:0000117 		KEEP AS NON CORE
Summary: Endocytosis regulation; synaptic context more specific — parent term too general here
Reason: Tissue-specific or specialized function
GO:0051649 establishment of localization in cell
IEA
GO_REF:0000117 		KEEP AS NON CORE
Summary: Too general; adds no mechanistic specificity for Calm3
Reason: Too general — more specific terms are available
GO:0098793 presynapse
IEA
GO_REF:0000117 		KEEP AS NON CORE
Summary: Presynaptic enrichment is plausible given Calm3 brain expression but represents specialized neuronal context rather than a universal Calm3 localization
Reason: Tissue-specific or specialized function
GO:0150034 distal axon
IEA
GO_REF:0000117 		KEEP AS NON CORE
Summary: Distal axon localization is neuronal-context specific
Reason: Tissue-specific or specialized function
GO:0000785 chromatin
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Chromatin association is not a primary Calm3 localization; carried over from family-wide annotation
Reason: Tissue-specific or specialized function
GO:0001975 response to amphetamine
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Amphetamine response in dopaminergic neurons; very context-specific
Reason: Tissue-specific or specialized function
GO:0002027 regulation of heart rate
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Heart rate regulation through ion channel modulation is a cardiac physiological context of calmodulin channel regulation, not a universal Calm3 core function
Reason: Tissue-specific or specialized function
GO:0005246 calcium channel regulator activity
IEA
GO_REF:0000120 		ACCEPT
Summary: Regulates L-type calcium channels, RyR, and other calcium channels; core calmodulin activity
Reason: Core calmodulin function or localization
GO:0005513 detection of calcium ion
IEA
GO_REF:0000120 		ACCEPT
Summary: Core calcium sensing function; redundant with IBA
Reason: Core calmodulin function or localization
GO:0005634 nucleus
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Nuclear localization is context-specific for calmodulin; not a Calm3-defining annotation
Reason: Tissue-specific or specialized function
GO:0005737 cytoplasm
IEA
GO_REF:0000120 		ACCEPT
Summary: Primary cytoplasmic localization; core
Reason: Core calmodulin function or localization
GO:0005813 centrosome
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Centrosomal localization for cell division
Reason: Tissue-specific or specialized function
GO:0005829 cytosol
IEA
GO_REF:0000120 		ACCEPT
Summary: Soluble cytosolic calcium sensor; core
Reason: Core calmodulin function or localization
GO:0005876 spindle microtubule
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Spindle microtubule association during mitosis
Reason: Tissue-specific or specialized function
GO:0008179 adenylate cyclase binding
IEA
GO_REF:0000120 		ACCEPT
Summary: Calmodulin directly binds calmodulin-sensitive adenylate cyclases (AC1, AC8); broadly conserved
Reason: Core calmodulin function or localization
GO:0010856 adenylate cyclase activator activity
IEA
GO_REF:0000120 		ACCEPT
Summary: Activates calcium-dependent adenylate cyclases for cAMP signaling
Reason: Core calmodulin function or localization
GO:0010880 regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
IEA
GO_REF:0000120 		ACCEPT
Summary: Regulates RyR-mediated calcium release from SR; supported by RYR1/RYR2 interaction evidence
Reason: Core calmodulin function or localization
GO:0010881 regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Cardiac calcium-induced calcium release regulation is consistent with calmodulin regulation of RyR channels but is cardiac-specific downstream physiology
Reason: Tissue-specific or specialized function
GO:0016240 autophagosome membrane docking
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: Autophagosome docking; no specific evidence for Calm3 at this process; specialized context
Reason: Tissue-specific or specialized function
GO:0019855 calcium channel inhibitor activity
IEA
GO_REF:0000120 		ACCEPT
Summary: Inhibitory regulation of certain calcium channels (IP3 receptor inhibition, RyR inhibition at high calcium); broadly conserved calmodulin function
Reason: Core calmodulin function or localization
GO:0019901 protein kinase binding
IEA
GO_REF:0000120 		ACCEPT
Summary: Binds CaMKII, CaMKIV, and other calmodulin-dependent kinases; core calmodulin activity
Reason: Core calmodulin function or localization
GO:0019904 protein domain specific binding
IEA
GO_REF:0000120 		MARK AS OVER ANNOTATED
Summary: Parent binding term too generic; does not capture specific calmodulin-recognition motif interactions
Reason: Too general — more specific terms are available
GO:0030017 sarcomere
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Sarcomere localization in striated muscle; calmodulin binds titin and myosin light chains; tissue-specific context
Reason: Tissue-specific or specialized function
GO:0030235 nitric-oxide synthase regulator activity
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Calmodulin activates eNOS, nNOS, and iNOS; plausible but represents specialized context
Reason: Tissue-specific or specialized function
GO:0030426 growth cone
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Growth cone localization for axon guidance signaling; neuronal-specific context
Reason: Tissue-specific or specialized function
GO:0030672 synaptic vesicle membrane
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Synaptic vesicle membrane association; neuronal-specific; SYT7 interaction supports synaptic context (PMID:24569478) but doesn't establish vesicle membrane localization for Calm3 specifically
Reason: Tissue-specific or specialized function
GO:0031432 titin binding
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Titin binding in muscle; tissue-specific context
Reason: Tissue-specific or specialized function
GO:0031800 type 3 metabotropic glutamate receptor binding
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: mGluR3 binding; specific neuronal interaction not directly established for mouse Calm3
Reason: Tissue-specific or specialized function
GO:0031966 mitochondrial membrane
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Mitochondrial membrane association; likely contextual localization carried from family-wide annotation
Reason: Tissue-specific or specialized function
GO:0032465 regulation of cytokinesis
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Cytokinesis regulation with CCP110 and centrin
Reason: Tissue-specific or specialized function
GO:0032991 protein-containing complex
IEA
GO_REF:0000120 		MARK AS OVER ANNOTATED
Summary: Too generic; adds no specificity beyond targeted complex terms already present
Reason: Too general — more specific terms are available
GO:0034704 calcium channel complex
IEA
GO_REF:0000120 		ACCEPT
Summary: Component of calcium channel complexes (RyR1, RyR2, L-type Ca2+ channels); core calmodulin function supported by direct interaction evidence
Reason: Core calmodulin function or localization
GO:0035458 cellular response to interferon-beta
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: Interferon-beta response; likely indirect/pathway association; specialized context
Reason: Tissue-specific or specialized function
GO:0043209 myelin sheath
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Myelin sheath localization; supported by direct IDA evidence (PMID:19855925) for CaM-MBP complex in myelin; but Calm3 identity in the study is not established — general calmodulin protein
Reason: Tissue-specific or specialized function
GO:0043539 protein serine/threonine kinase activator activity
IEA
GO_REF:0000120 		ACCEPT
Summary: Activates CaMKII, CaMKIV, MLCK, and other calcium-dependent kinases; core calmodulin function
Reason: Core calmodulin function or localization
GO:0043548 phosphatidylinositol 3-kinase binding
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: PI3K binding; specific signaling interaction not independently established for mouse Calm3
Reason: Tissue-specific or specialized function
GO:0044325 transmembrane transporter binding
IEA
GO_REF:0000120 		ACCEPT
Summary: Binds ion channels and transporters; consistent with calmodulin's role in channel regulation
Reason: Core calmodulin function or localization
GO:0046427 positive regulation of receptor signaling pathway via JAK-STAT
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: JAK-STAT pathway; indirect/computed association; specialized context
Reason: Tissue-specific or specialized function
GO:0048306 calcium-dependent protein binding
IEA
GO_REF:0000120 		ACCEPT
Summary: Calcium-dependent target protein binding; core calmodulin activity
Reason: Core calmodulin function or localization
GO:0050998 nitric-oxide synthase binding
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Binding to NOS isoforms; biologically plausible but specialized context
Reason: Tissue-specific or specialized function
GO:0051412 response to corticosterone
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Corticosterone response in neurons; very specialized, indirect
Reason: Tissue-specific or specialized function
GO:0051592 response to calcium ion
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Response to calcium ion; too generic — more specific calcium-sensing and detection terms capture the relevant biology
Reason: Too general — more specific terms capture this function better
GO:0055117 regulation of cardiac muscle contraction
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Cardiac contraction regulation reflects tissue-specific physiology downstream of core calmodulin calcium-channel regulation
Reason: Tissue-specific or specialized function
GO:0071346 cellular response to type II interferon
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: Interferon-gamma response; indirect/computed association; specialized context
Reason: Tissue-specific or specialized function
GO:0072542 protein phosphatase activator activity
IEA
GO_REF:0000120 		ACCEPT
Summary: Activates calcineurin (PP2B) phosphatase; core calmodulin function in Ca2+-calcineurin-NFAT signaling
Reason: Core calmodulin function or localization
GO:0097720 calcineurin-mediated signaling
IEA
GO_REF:0000120 		ACCEPT
Summary: Calcineurin activation for NFAT signaling; core, redundant with IBA entry
Reason: Core calmodulin function or localization
GO:0098685 Schaffer collateral - CA1 synapse
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Hippocampal CA1 synapse localization; neuronal-specific context; consistent with Calm3 brain enrichment but represents specialized rather than universal Calm3 localization
Reason: Tissue-specific or specialized function
GO:0098901 regulation of cardiac muscle cell action potential
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Cardiac action potential regulation through L-type Ca channel and KCNQ modulation; well-established for calmodulin but cardiac-specific context
Reason: Tissue-specific or specialized function
GO:0099523 presynaptic cytosol
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Presynaptic cytosol localization; neuronal-specific; relevant for Calm3's synaptic role but treats specialized context as universal
Reason: Tissue-specific or specialized function
GO:0099524 postsynaptic cytosol
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Postsynaptic cytosol localization; supported by Calm3-specific dendritic mRNA targeting via Stau2 (PMID:28765142), but that evidence is for mRNA localization and does not directly establish Calm3 protein localization to postsynaptic cytosol
Reason: Neuronal compartment-specific context supported indirectly by Calm3 mRNA localization
GO:0140056 organelle localization by membrane tethering
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: Organelle membrane tethering; indirect/computed association
Reason: Tissue-specific or specialized function
GO:1900242 regulation of synaptic vesicle endocytosis
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Synaptic vesicle endocytosis regulation; neuronal-specific; see also IDA/IMP entries from PMID:31628181 (Calm2 KO study)
Reason: Tissue-specific or specialized function
GO:1901844 regulation of cell communication by electrical coupling involved in cardiac conduction
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Cardiac electrical coupling regulation; specialized cardiac context
Reason: Tissue-specific or specialized function
GO:1902494 catalytic complex
IEA
GO_REF:0000120 		MARK AS OVER ANNOTATED
Summary: Too generic; adds no specificity beyond more precise complex and binding terms
Reason: Too general — more specific terms are available
GO:1990456 mitochondrion-endoplasmic reticulum membrane tethering
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: ER-mitochondria contact; indirect/computed association; specialized context
Reason: Tissue-specific or specialized function
GO:2000300 regulation of synaptic vesicle exocytosis
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: Synaptic vesicle exocytosis regulation; neuronal-specific; SYT7 interaction (PMID:24569478) supports synaptic role but does not establish Calm3-specific exocytosis control
Reason: Tissue-specific or specialized function
GO:1901842 negative regulation of high voltage-gated calcium channel activity
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1 (identical protein); inhibitory regulation of L-type Ca channels is well-established for calmodulin and consistent with RyR regulatory roles; transfer is valid
Reason: Core calmodulin function or localization
GO:0000785 chromatin
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs (all three RGD sources carry this term); chromatin association is contextual, not a Calm3-defining localization; paralog-sensitive transfer
Reason: Paralog-sensitive ISO transfer reflects specialized context rather than a Calm3 core role
GO:0000922 spindle pole
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; spindle pole localization during mitosis
Reason: Tissue-specific or specialized function
GO:0002027 regulation of heart rate
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; heart rate regulation through ion channel modulation is cardiac physiological context downstream of core calmodulin channel regulation
Reason: Tissue-specific or specialized function
GO:0005246 calcium channel regulator activity
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; calcium channel regulation is core calmodulin function; transfer is valid and supported by direct RYR1/RYR2 interaction evidence for this protein
Reason: Core calmodulin function or localization
GO:0005509 calcium ion binding
ISO
GO_REF:0000096 		ACCEPT
Summary: ISO transfer from rat calmodulin; core EF-hand calcium-binding function; valid regardless of rat paralog source
Reason: Core calmodulin function or localization
GO:0005509 calcium ion binding
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; core EF-hand calcium-binding function; redundant but valid
Reason: Core calmodulin function or localization
GO:0005513 detection of calcium ion
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; core calcium sensing function; transfer is valid
Reason: Core calmodulin function or localization
GO:0005634 nucleus
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs; nuclear localization is plausible but context-specific; paralog-sensitive transfer does not justify treating as Calm3 core localization
Reason: Paralog-sensitive ISO transfer reflects specialized context rather than a Calm3 core role
GO:0005813 centrosome
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; centrosomal localization for cell division
Reason: Tissue-specific or specialized function
GO:0005876 spindle microtubule
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; spindle microtubule association during mitosis
Reason: Tissue-specific or specialized function
GO:0008179 adenylate cyclase binding
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; calmodulin binds calmodulin-sensitive adenylate cyclases; broadly conserved interaction; valid transfer
Reason: Core calmodulin function or localization
GO:0010856 adenylate cyclase activator activity
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; activates calcium-dependent adenylate cyclases; valid transfer
Reason: Core calmodulin function or localization
GO:0010880 regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; SR calcium release via RyR regulation; valid transfer supported by direct RYR1/RYR2 interaction evidence (PMID:18650434)
Reason: Core calmodulin function or localization
GO:0010881 regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; cardiac calcium-induced calcium release is valid but cardiac-specific downstream physiology rather than a universal Calm3 core function
Reason: Tissue-specific or specialized function
GO:0019901 protein kinase binding
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; calmodulin binds CaMK family and other kinases; broadly conserved; valid transfer
Reason: Core calmodulin function or localization
GO:0019904 protein domain specific binding
ISO
GO_REF:0000096 		MARK AS OVER ANNOTATED
Summary: Too generic; rat paralog ISO transfer adds no mechanistic specificity for Calm3; same issue as the IEA version of this term
Reason: Too general and supported only by paralog-sensitive ISO transfer
GO:0030017 sarcomere
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; sarcomere localization in striated muscle; tissue-specific context
Reason: Tissue-specific or specialized function
GO:0030235 nitric-oxide synthase regulator activity
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs (all three RGD sources); NOS regulation is plausible but not a Calm3-defining function; paralog-sensitive transfer
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core function
GO:0030426 growth cone
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from all three rat calmodulin paralogs; growth cone localization is neuronal-specific; paralog-sensitive transfer lacking Calm3-specific evidence
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
GO:0030672 synaptic vesicle membrane
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from all three rat calmodulin paralogs; synaptic vesicle membrane localization is neuronal-specific; paralog-sensitive transfer; consistent with SYT7 interaction (PMID:24569478) but does not establish Calm3 specifically at this compartment
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
GO:0031432 titin binding
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; titin binding in muscle sarcomere; tissue-specific context
Reason: Tissue-specific or specialized function
GO:0031800 type 3 metabotropic glutamate receptor binding
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs; mGluR3 binding is a specific neuronal interaction not directly established for mouse Calm3; paralog-sensitive transfer
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core interaction
GO:0031966 mitochondrial membrane
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from all three rat calmodulin paralogs; mitochondrial membrane localization is contextual; paralog-sensitive transfer lacks Calm3-specific support
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
GO:0032465 regulation of cytokinesis
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; cytokinesis regulation with CCP110 and centrin
Reason: Tissue-specific or specialized function
GO:0032991 protein-containing complex
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Too generic; adds no specificity beyond more precise complex terms; same concern as IEA version
Reason: Too general — more specific terms are available
GO:0034704 calcium channel complex
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; calmodulin is a component of calcium channel complexes; supported by direct RYR1/RYR2 interaction evidence; valid transfer
Reason: Core calmodulin function or localization
GO:0043209 myelin sheath
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs; myelin sheath localization supported by IDA (PMID:19855925) for CaM-MBP complex; but the study used general CaM, not Calm3-specific; paralog-sensitive transfer consistent with specialized context
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
GO:0043539 protein serine/threonine kinase activator activity
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; activates CaMKII, CaMKIV, MLCK; core calmodulin function; valid transfer
Reason: Core calmodulin function or localization
GO:0043548 phosphatidylinositol 3-kinase binding
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs; PI3K binding is a specific interaction not independently established for mouse Calm3; paralog-sensitive transfer
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core interaction
GO:0044325 transmembrane transporter binding
ISO
GO_REF:0000096 		ACCEPT
Summary: ISO transfer from rat calmodulin paralogs; broad transporter-binding; valid at protein level; consistent with channel-regulation function
Reason: Core calmodulin function or localization
GO:0044325 transmembrane transporter binding
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; binds ion channels and transporters; valid transfer; core calmodulin channel-regulation function
Reason: Core calmodulin function or localization
GO:0048306 calcium-dependent protein binding
ISO
GO_REF:0000096 		ACCEPT
Summary: ISO transfer from rat calmodulin paralogs; calcium-dependent target protein binding is core calmodulin function; valid transfer
Reason: Core calmodulin function or localization
GO:0050998 nitric-oxide synthase binding
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs; NOS binding is plausible but represents specialized context; paralog-sensitive transfer lacks Calm3-specific support
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core interaction
GO:0051592 response to calcium ion
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; too generic — the detection and sensing terms capture the core biology more precisely
Reason: Too general — more specific terms capture this function better
GO:0055117 regulation of cardiac muscle contraction
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; cardiac contraction regulation is a tissue-specific physiological consequence of calmodulin ion-channel regulation
Reason: Tissue-specific or specialized function
GO:0072542 protein phosphatase activator activity
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; activates calcineurin (PP2B) phosphatase; core calmodulin function; valid transfer
Reason: Core calmodulin function or localization
GO:0097720 calcineurin-mediated signaling
ISO
GO_REF:0000119 		ACCEPT
Summary: ISO transfer from human CALM1; calcineurin activation; redundant with IBA but valid transfer
Reason: Core calmodulin function or localization
GO:0098685 Schaffer collateral - CA1 synapse
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs; hippocampal CA1 synapse localization; very specific neuronal context; Calm3 is brain-enriched but this level of specificity cannot be assigned solely from paralog ISO transfer
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
GO:0098901 regulation of cardiac muscle cell action potential
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; cardiac action potential regulation; valid transfer but specialized cardiac context rather than a universal Calm3 function
Reason: Tissue-specific or specialized function
GO:0099523 presynaptic cytosol
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs (all three sources); presynaptic cytosol localization; neuronal-specific; Calm3 brain enrichment makes this plausible but the paralog transfer from all three rat Calm genes lacks Calm3-specific evidence
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
GO:0099524 postsynaptic cytosol
ISO
GO_REF:0000096 		KEEP AS NON CORE
Summary: ISO transfer from rat calmodulin paralogs; Calm3L mRNA is uniquely targeted to neuronal dendrites via Stau2 (PMID:28765142), but mRNA localization does not directly demonstrate Calm3 protein localization to postsynaptic cytosol
Reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
GO:1901844 regulation of cell communication by electrical coupling involved in cardiac conduction
ISO
GO_REF:0000119 		KEEP AS NON CORE
Summary: ISO transfer from human CALM1; cardiac gap junction/conduction regulation; valid transfer but specialized cardiac context
Reason: Tissue-specific or specialized function
GO:1902494 catalytic complex
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: ISO transfer from human CALM1; too generic; adds no specificity beyond more precise complex and binding terms
Reason: Too general — more specific terms are available
GO:0044305 calyx of Held
NAS
PMID:31628181
Protein Kinase C and Calmodulin Serve As Calcium Sensors for... 		KEEP AS NON CORE
Summary: PMID:31628181 used Calm2 knockout mice (not Calm3) to study calcium-stimulated endocytosis at calyx of Held synapses; NAS (non-traceable author statement) attribution to Calm3 (P0DP28) is based on protein identity; annotation reflects family-level calmodulin biology at this synapse rather than Calm3-specific evidence
Reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than direct Calm3 experimental evidence
GO:0044305 calyx of Held
IMP
PMID:31628181
Protein Kinase C and Calmodulin Serve As Calcium Sensors for... 		KEEP AS NON CORE
Summary: PMID:31628181 used Calm2 knockout mice; the IMP annotation is attributed to Calm3 (P0DP28) based on protein identity but the mutant was Calm2-specific; the phenotype was observed in Calm2 KO, not Calm3 KO; kept as non-core consistent with other calyx entries
Reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than direct Calm3 experimental evidence
GO:0044305 calyx of Held
IDA
PMID:31628181
Protein Kinase C and Calmodulin Serve As Calcium Sensors for... 		KEEP AS NON CORE
Summary: IDA from SynGO curation of PMID:31628181; SynGO annotated calmodulin protein presence at calyx of Held; calmodulin protein (identical across all three mouse paralogs) is detected at this synapse; localization evidence is valid at protein level but Calm3-specificity is not established
Reason: Valid protein-level localization evidence but not Calm3-specific; Calm2 is the paralog with direct knockout evidence at this synapse
GO:0140238 presynaptic endocytosis
NAS
PMID:31628181
Protein Kinase C and Calmodulin Serve As Calcium Sensors for... 		KEEP AS NON CORE
Summary: NAS from PMID:31628181; presynaptic endocytosis at calyx of Held; same provenance issue as calyx-of-Held NAS — experiment used Calm2 KO; annotation to Calm3 by protein identity
Reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than direct Calm3 experimental evidence
GO:0140238 presynaptic endocytosis
IMP
PMID:31628181
Protein Kinase C and Calmodulin Serve As Calcium Sensors for... 		KEEP AS NON CORE
Summary: IMP from PMID:31628181; mutant phenotype from Calm2 KO used to infer Calm3 function; same provenance concern as calyx-of-Held — experiment used Calm2 KO not Calm3 KO; kept as non-core consistent with other presynaptic endocytosis entries
Reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than direct Calm3 experimental evidence
GO:0140238 presynaptic endocytosis
IDA
PMID:31628181
Protein Kinase C and Calmodulin Serve As Calcium Sensors for... 		KEEP AS NON CORE
Summary: IDA from SynGO curation; calmodulin's role in presynaptic endocytosis is established but not Calm3-specific; consistent with Calm3 brain expression context
Reason: Valid protein-level functional evidence but not Calm3-specific
GO:0098901 regulation of cardiac muscle cell action potential
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: ISS manual transfer; cardiac action potential regulation is well-established for calmodulin; specialized cardiac context rather than a universal Calm3 role
Reason: Tissue-specific or specialized function
GO:1901842 negative regulation of high voltage-gated calcium channel activity
ISS
GO_REF:0000024 		ACCEPT
Summary: ISS manual transfer; inhibitory regulation of L-type Ca channels by calmodulin; well-established calmodulin function; consistent with ISO entry for same term
Reason: Core calmodulin function or localization
GO:0043209 myelin sheath
IDA
PMID:19855925
Structural analysis of the complex between calmodulin and fu... 		KEEP AS NON CORE
Summary: PMID:19855925 demonstrates CaM-MBP complex in myelin sheaths via SAXS/NMR and colocalization; the study uses general calmodulin protein (not Calm3-specific) isolated from human brain; localization evidence is attributed to P0DP28 (Calm3) via CAFA database assignment; Calm3 is expressed in brain where myelin is present so the annotation is plausible but represents specialized context
Reason: IDA evidence is for calmodulin protein in general, not specifically Calm3; specialized neural context
GO:0005509 calcium ion binding
ISS
GO_REF:0000024 		ACCEPT
Summary: ISS manual transfer; core EF-hand calcium binding; redundant with IBA but confirms this core function
Reason: Core calmodulin function or localization
GO:0008076 voltage-gated potassium channel complex
IGI
PMID:12223552
Calmodulin is an auxiliary subunit of KCNQ2/3 potassium chan... 		KEEP AS NON CORE
Summary: PMID:12223552 (Wen & Levitan 2002) identifies calmodulin as a constitutive auxiliary subunit of KCNQ2/3 potassium channels in mouse brain using yeast two-hybrid and co-immunoprecipitation; uses general calmodulin (from mouse brain) not specifically Calm3; IGI evidence is for the calmodulin protein interacting with KCNQ genes; valid but Calm3-specificity is not established
Reason: Evidence is for calmodulin protein generally, not Calm3 specifically; specialized neuronal context
GO:0000086 G2/M transition of mitotic cell cycle
IDA
PMID:2469574
Calmodulin is required for cell-cycle progression during G1 ... 		KEEP AS NON CORE
Summary: PMID:2469574 (Rasmussen & Means 1989) uses inducible antisense RNA to reduce calmodulin in mouse C127 cells, causing cell cycle arrest at G1 and mitosis; the antisense targets total calmodulin (CaM), not specifically Calm3; direct evidence for calmodulin cell cycle requirement; core function consistent with centrosome/spindle annotations
Reason: Tissue-specific or specialized function; IDA evidence supports calmodulin requirement in cell cycle progression but not core Calm3 molecular function
GO:0005509 calcium ion binding
TAS
PMID:2469574
Calmodulin is required for cell-cycle progression during G1 ... 		ACCEPT
Summary: TAS (traceable author statement) for calcium ion binding from PMID:2469574; core EF-hand function; redundant with IBA/ISS entries
Reason: Core calmodulin function or localization
Supporting Evidence:
file:mouse/Calm3/Calm3-deep-research-falcon.md

Core Functions

Binds calcium through four EF-hand motifs; primary molecular mechanism for calmodulin activity; triggers conformational change enabling target binding and transduction of calcium signals.

Molecular Function:
calcium ion binding
Directly Involved In:
detection of calcium ion
Cellular Locations:
cytosol
Supporting Evidence:
  • UniProtKB:P0DP28
    This protein has four functional calcium-binding sites.
  • file:mouse/Calm3/Calm3-deep-research-falcon.md
    Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.

Activates CaMKII, CaMKIV, and myosin light-chain kinases in a calcium-dependent manner; core downstream effector function of calmodulin.

Molecular Function:
protein serine/threonine kinase activator activity
Directly Involved In:
calcium-mediated signaling
Cellular Locations:
cytosol
Supporting Evidence:
  • UniProtKB:P0DP28
    Among the enzymes to be stimulated by the calmodulin-calcium complex are a number of protein kinases, such as myosin light-chain kinases and calmodulin-dependent protein kinase type II (CaMK2), and phosphatases.
  • file:mouse/Calm3/Calm3-deep-research-falcon.md
    Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.

Activates calcineurin (PP2B) phosphatase for NFAT dephosphorylation and downstream gene regulation; core calmodulin signaling function.

Molecular Function:
protein phosphatase activator activity
Directly Involved In:
calcineurin-mediated signaling
Cellular Locations:
cytosol
Supporting Evidence:
  • UniProtKB:P0DP28
    Among the enzymes to be stimulated by the calmodulin-calcium complex are a number of protein kinases, such as myosin light-chain kinases and calmodulin-dependent protein kinase type II (CaMK2), and phosphatases.
  • file:mouse/Calm3/Calm3-deep-research-falcon.md
    Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.

Regulates RyR1, RyR2, L-type Ca2+ channels, and other ion channels; bidirectional regulation depending on calcium levels; supported by direct RYR1/RYR2 interaction evidence.

Molecular Function:
calcium channel regulator activity
Directly Involved In:
regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
Cellular Locations:
cytosol
Supporting Evidence:
  • PMID:18650434
    Ca(2+)-S100A1 and Ca(2+)-CaM compete directly for the same binding site on the ryanodine receptor.
  • UniProtKB:P0DP28
    Interacts with RYR2; regulates RYR2 calcium-release channel activity
  • file:mouse/Calm3/Calm3-deep-research-falcon.md
    Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.

References

GO_REF:0000024
Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity
GO_REF:0000033
Annotation inferences using phylogenetic trees
GO_REF:0000044
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt
GO_REF:0000096
Automated transfer of experimentally-verified manual GO annotation data to mouse-rat orthologs
  • Source rat calmodulin genes RGD:2257, RGD:2258, RGD:2259 all encode the same protein as mouse Calm3; ISO transfers are biochemically valid but carry all rat paralog annotations to each mouse Calm locus, producing paralog-proliferation of fine-grained annotations without Calm3-specific evidence
GO_REF:0000107
Automatic transfer of experimentally verified manual GO annotation data to orthologs using Ensembl Compara
GO_REF:0000117
Electronic Gene Ontology annotations created by ARBA machine learning models
GO_REF:0000119
Automated transfer of experimentally-verified manual GO annotation data to mouse-human orthologs
  • Source is human CALM1 (P0DP25); all human CALM1/CALM2/CALM3 proteins are identical to mouse Calm3 protein; ISO transfers represent valid ortholog evidence with 100% sequence identity; no paralog-specific differences exist at the protein level
GO_REF:0000120
Combined Automated Annotation using Multiple IEA Methods
file:mouse/Calm3/Calm3-deep-research-falcon.md
Falcon deep research summary for mouse Calm3
  • Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.
PMID:12223552
Calmodulin is an auxiliary subunit of KCNQ2/3 potassium channels.
  • Calmodulin (CaM) identified as constitutive auxiliary subunit of KCNQ2/3 potassium channels via yeast two-hybrid and co-immunoprecipitation from mouse brain
    "Calmodulin (CaM) was identified as a KCNQ2 and KCNQ3 potassium channel-binding protein, using a yeast two-hybrid screen. CaM is tethered constitutively to the channel, in the absence or presence of Ca2+, in transfected cells and also coimmunoprecipitates with KCNQ2/3 from mouse brain."
  • CaM binding to KCNQ2 IQ-like motifs is calcium-independent and required for channel activity
    "The voltage-dependent activation of the KCNQ2/3 channel also shows no Ca2+ sensitivity, nor is it affected by overexpression of the Ca2+-insensitive CaM mutant. On the other hand, KCNQ2 mutants deficient in CaM binding are unable to generate detectable currents when coexpressed with KCNQ3 in CHO cells...The correlation of CaM binding with channel function suggests that CaM is an auxiliary subunit of the KCNQ2/3 channel."
  • Evidence uses general calmodulin from mouse brain, not specifically Calm3
PMID:18650434
S100A1 and calmodulin compete for the same binding site on ryanodine receptor.
  • Ca2+-calmodulin competes for the same ryanodine receptor binding site as S100A1.
    "Ca(2+)-S100A1 and Ca(2+)-CaM compete directly for the same binding site on the ryanodine receptor."
PMID:19855925
Structural analysis of the complex between calmodulin and full-length myelin basic protein, an intrinsically disordered molecule.
  • CaM pulled down as major calcium-dependent binding partner of MBP from human brain white matter
    "We pulled down MBP from human brain white matter as the major calcium-dependent CaM-binding protein."
  • CaM and MBP colocalize in myelin sheaths
    "show that CaM and MBP colocalize in myelin sheaths."
  • Study uses general calmodulin protein; does not identify which calmodulin gene product is present in myelin
PMID:2469574
Calmodulin is required for cell-cycle progression during G1 and mitosis.
  • Antisense-RNA-induced reduction of calmodulin in mouse C127 cells causes cell cycle arrest at G1 and mitosis
    "Cells carrying the BPV-CaMAS vector transiently produce CaM anti-sense RNA resulting in a significant decrease in intracellular CaM concentration...Flow cytometric analysis showed that progression through G1 and mitosis was affected by changes in CaM levels."
  • Calmodulin overexpression transiently accelerates proliferation
    "Increased CaM caused a transient acceleration of proliferation, while the anti-sense RNA induced decrease in CaM caused a transient cell cycle arrest."
  • Evidence targets total calmodulin (all CaM genes), not specifically Calm3
PMID:28765142
A retained intron in the 3'-UTR of Calm3 mRNA mediates its Staufen2- and activity-dependent localization to neuronal dendrites.
  • Calm3L (long isoform) mRNA is the top Stau2 iCLIP target in E18 mouse brain via a retained 3-UTR intron; Calm1 and Calm2 lack Stau2 crosslink clusters in this analysis — this is a Calm3-specific regulatory feature
    "In 28 (7.9%) of those, binding occurred to a retained intron in their 3'-UTR The strongest bound 3'-UTR intron was present in the longest isoform of Calmodulin 3 (Calm3L ) mRNA Calm3L 3'-UTR contains six Stau2 crosslink clusters, four of which are in this retained 3'-UTR intron"
  • Stau2-mediated dendritic localization of Calm3L mRNA is activity-dependent and abolished by synaptic silencing
    "NMDA-mediated synaptic activity specifically promoted the dendritic mRNA localization of the Calm3L isoform, while inhibition of synaptic activity reduced it substantially."
  • Loss of the retained 3-UTR intron impairs dendritic localization; Stau2 knockdown increases nuclear retention without affecting total mRNA stability
    "The Calm3L mRNA localized to neuronal dendrites, while lack of the 3'-UTR intron impaired its dendritic localization. Importantly, Stau2 mediates this dendritic localization via the 3'-UTR intron, without affecting its stability."
PMID:31628181
Protein Kinase C and Calmodulin Serve As Calcium Sensors for Calcium-Stimulated Endocytosis at Synapses.
  • Calmodulin 2 gene (Calm2) knockout mice used for all calmodulin-related genetic experiments
    "We generated PKC (α or β-isoform) and calmodulin (calmodulin 2 gene) knock-out mice of either sex and measured endocytosis with capacitance measurements, pHluorin imaging and electron microscopy."
  • Calm2 KO inhibits slow, rapid, and bulk endocytosis at calyx of Held and hippocampal synapses
    "We found that these knock-outs inhibited slow (∼10-30 s) and rapid (<∼3 s) endocytosis at large calyx-type calyces, and inhibited slow endocytosis and bulk endocytosis (forming large endosome-like structures) at small conventional hippocampal synapses"
  • Rescue by wild-type calmodulin but not calcium-binding-deficient mutant confirms calcium-sensor role
    "Inhibition of slow endocytosis in PKC or calmodulin 2 knock-out hippocampal synapses was rescued by overexpressing wild-type PKC or calmodulin, but not calcium-binding-deficient PKC or calmodulin mutant, respectively, suggesting that calcium stimulates endocytosis by binding with its calcium sensor PKC and calmodulin."
  • The knockout is Calm2-specific; attribution of IMP/NAS evidence to Calm3 (P0DP28) is based on protein identity, not direct Calm3 experimental manipulation

Suggested Questions for Experts

Q: Is Calm3 preferentially recruited over Calm1 or Calm2 at brain synapses, or are all three calmodulin paralogs functionally interchangeable at this location?

Q: What is the basis for the calyx-of-Held and presynaptic endocytosis IDA annotations being attributed to Calm3 (P0DP28) by SynGO when the knockout experiment in PMID:31628181 specifically used Calm2?

Q: Do Calm1, Calm2, and Calm3 have distinct expression profiles across mouse brain cell types that would justify differential annotation of synaptic, cardiac, or other specialized terms to specific paralogs?

Suggested Experiments

Experiment: Calm3-specific knockout at calyx of Held synapses to test whether Calm3 makes a distinct contribution to presynaptic endocytosis independent of Calm2

Hypothesis: Calm3, as the most brain-enriched calmodulin paralog, may be specifically required at certain synapses even though all three calmodulin proteins are biochemically identical

Type: Conditional gene knockout and synaptic physiology

Experiment: Single-cell RNA-seq comparison of Calm1, Calm2, and Calm3 expression across mouse brain cell types to determine if any calmodulin paralog is preferentially expressed in specific neuronal populations

Hypothesis: Calm3 may show distinct cell-type enrichment that would justify differential assignment of neuronal ISO annotations to Calm3 versus Calm1/Calm2

Type: Single-cell transcriptomics

Experiment: Generate calmodulin paralog-specific antibodies or endogenous epitope tags to determine whether Calm3 protein specifically localizes to synaptic vesicle membrane, presynaptic cytosol, or myelin sheath at the protein level

Hypothesis: Calm3-encoded protein may be preferentially present at certain subcellular compartments due to local translation or differential mRNA localization

Type: Endogenous tagging and subcellular proteomics

📚 Additional Documentation

Deep Research Falcon

(Calm3-deep-research-falcon.md)

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gene_info: Name=Calm3 {ECO:0000312|MGI:MGI:103249}; Synonyms=Cam3, Camc;
organism_full: Mus musculus (Mouse).
protein_family: Belongs to the calmodulin family. .
protein_domains: CALM/Myosin/TropC-like. (IPR050230); EF-hand-dom_pair. (IPR011992);
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Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: P0DP28
  • Protein Description: RecName: Full=Calmodulin-3 {ECO:0000250|UniProtKB:P0DP25};
  • Gene Information: Name=Calm3 {ECO:0000312|MGI:MGI:103249}; Synonyms=Cam3, Camc;
  • Organism (full): Mus musculus (Mouse).
  • Protein Family: Belongs to the calmodulin family. .
  • Key Domains: CALM/Myosin/TropC-like. (IPR050230); EF-hand-dom_pair. (IPR011992); EF_Hand_1_Ca_BS. (IPR018247); EF_hand_dom. (IPR002048); EF-hand_7 (PF13499)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "Calm3" matches the protein description above
  2. Verify the organism is correct: Mus musculus (Mouse).
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'Calm3' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene Calm3 (gene ID: Calm3, UniProt: P0DP28) in mouse.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: P0DP28
  • Protein Description: RecName: Full=Calmodulin-3 {ECO:0000250|UniProtKB:P0DP25};
  • Gene Information: Name=Calm3 {ECO:0000312|MGI:MGI:103249}; Synonyms=Cam3, Camc;
  • Organism (full): Mus musculus (Mouse).
  • Protein Family: Belongs to the calmodulin family. .
  • Key Domains: CALM/Myosin/TropC-like. (IPR050230); EF-hand-dom_pair. (IPR011992); EF_Hand_1_Ca_BS. (IPR018247); EF_hand_dom. (IPR002048); EF-hand_7 (PF13499)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "Calm3" matches the protein description above
  2. Verify the organism is correct: Mus musculus (Mouse).
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'Calm3' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene Calm3 (gene ID: Calm3, UniProt: P0DP28) in mouse.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Comprehensive Research Report: Mouse Calm3 (Calmodulin-3) Functional Annotation

Target verification (gene/protein identity): This report concerns Mus musculus Calm3 encoding calmodulin-3 (UniProt P0DP28). Calm3 is a member of the calmodulin (CaM) family, a small EF-hand Ca2+-binding “sensor” protein. Mammals have three calmodulin genes (Calm1/Calm2/Calm3) that encode an identical 149–amino-acid CaM protein sequence, while differing in noncoding regulatory regions and expression control; therefore, any protein-level functional claims about CaM generally apply to Calm3’s encoded protein, whereas Calm3-specific biology is most likely regulatory (e.g., transcript localization/isoforms). (reed2015calm3mutationassociated pages 2-4, reed2015calm3mutationassociated pages 4-4, gruner2019preciseremovalof pages 1-4)

1. Key concepts and definitions (current understanding)

1.1 Calmodulin as a Ca2+ sensor (what Calm3 protein is)

Calmodulin is a ubiquitous intracellular Ca2+ sensor that translates changes in cytosolic Ca2+ concentration into changes in target protein activity (sobue2024calmodulinahighly pages 2-4). Resting free cytosolic Ca2+ is on the order of 10^-7 M, rising transiently to 10^-6–10^-5 M upon stimulation; CaM is one of the principal proteins that couples these Ca2+ rises to downstream responses (sobue2024calmodulinahighly pages 2-4).

1.2 Core structural definitions: EF-hands, lobes, and conformational switching

Calmodulin is described as a ~17 kDa, 149-aa protein composed of two globular domains (N-lobe and C-lobe) connected by a flexible linker/helix, with four EF-hand Ca2+-binding motifs (two per lobe) (hussey2023calmodulinmutationsin pages 1-2, denesyuk2023canonicalstructuralbindingmodes pages 1-5). A key functional property is Ca2+-dependent conformational change that exposes hydrophobic surfaces used for protein–protein interactions (sobue2024calmodulinahighly pages 2-4, denesyuk2023canonicalstructuralbindingmodes pages 1-5). The two lobes can act semi-independently and show different Ca2+ affinities; in one synthesis, the C-lobe Ca2+ affinity is ~KD 2.4 µM and N-lobe ~KD 16 µM, enabling CaM to decode Ca2+ signals with lobe-specific timing/thresholds (hussey2023calmodulinmutationsin pages 1-2).

1.3 Target recognition: CaM-binding motifs and “methionine-rich” binding surfaces

A major reason CaM regulates many targets is its adaptable binding surface. A quantitative structural analysis of CaM–target complexes highlights:

  • Target motifs: CaM-binding sites often contain two hydrophobic “anchor” residues separated by 10–17 residues, forming motif classes such as {1–10}, {1–14}, {1–16}, {1–17}; analysis also supports an additional {1–5} contribution to interaction geometry (denesyuk2023canonicalstructuralbindingmodes pages 1-5).
  • CaM residues: Methionine-rich hydrophobic patches are repeatedly used for binding. Specific methionines (Met51, Met71, Met72 and C-lobe equivalents Met124, Met144, Met145) are emphasized as key determinants forming “triggering/protective” layers for interaction, with methionines contributing ~46% of accessible hydrophobic patch area in representative complex surfaces analyzed (denesyuk2023canonicalstructuralbindingmodes pages 5-8, denesyuk2023canonicalstructuralbindingmodes pages 1-5).

2. Recent developments and latest research (prioritizing 2023–2024)

2.1 2023: Systematization of canonical CaM–target binding modes

A 2023 review/analysis synthesized binding “rules” across 35 representative 3D CaM–target structures, formalizing anchor-spacing motif classes and highlighting specific CaM residues (notably methionines) repeatedly used for target binding (denesyuk2023canonicalstructuralbindingmodes pages 5-8, denesyuk2023canonicalstructuralbindingmodes pages 1-5). This provides a mechanistic framework for functional annotation: Calm3’s protein product likely engages targets through the same EF-hand-driven exposure of methionine-rich hydrophobic pockets and canonical anchor-spacing motifs.

2.2 2024: Updated authoritative synthesis of CaM biology

A 2024 review frames CaM as a highly conserved, ubiquitous Ca2+ sensor with >300 binding proteins and emphasizes that signaling outcomes depend strongly on intracellular localization and Ca2+ sensitivity of specific CaM–target interactions (sobue2024calmodulinahighly pages 2-4). This “local signaling” viewpoint is especially relevant for Calm3, because the strongest Calm3-specific findings are post-transcriptional localization of its mRNA (Section 4.2).

2.3 2024: Gap junction chemical gating—Ca2+–CaM mechanism supported with quantitative parameters

A 2024 review argues that gap junction chemical gating occurs at high-nanomolar to low-micromolar intracellular Ca2+ and is mediated by Ca2+-CaM, rather than direct Ca2+–connexin electrostatic effects (peracchia2024calciumrolein pages 13-15, peracchia2024calciumrolein pages 1-2, peracchia2024calciumrolein pages 4-6). The review summarizes multiple converging evidence types (CaM inhibitors, CaM expression manipulation, CaM mutants, co-localization, mapped CaM-binding sites in connexins, peptide competition and direct binding assays) (peracchia2024calciumrolein pages 1-2, peracchia2024calciumrolein pages 18-19). Quantitative examples include:

  • Connexin CL2 peptide–CaM affinity KD ~0.7–1 µM (peracchia2024calciumrolein pages 11-13).
  • Peptide binding shifting CaM’s Ca2+ affinity from 2.9 ± 0.1 µM to 1.6 ± 0.1 µM (and increased Hill coefficient), consistent with reciprocal tuning of CaM and target (peracchia2024calciumrolein pages 11-13).
  • An ionomycin-induced [Ca2+]i rise reducing junctional conductance by 95%, prevented by a CaM inhibitor and reversible by chelation (peracchia2024calciumrolein pages 11-13).

These findings exemplify how Calm3-encoded CaM participates in channel gating through Ca2+-dependent binding, with quantitatively measurable coupling between binding and Ca2+ sensitivity.

2.4 2024: Translational advance—gene-selective antisense therapy exploiting CALM gene redundancy

A 2024 Circulation study provides proof-of-concept that selective depletion of one calmodulin gene (CALM1) can ameliorate disease phenotypes while leaving total CaM protein levels largely unchanged due to redundancy of the remaining genes (CALM2/3), illustrating a clinically relevant systems property of the calmodulin gene family (bortolin2024antisenseoligonucleotidetherapy pages 3-5). In screening and cellular assays:

  • CALM1-selective ASOs were designed with >3 mismatches to CALM2/3, and lead ASOs showed IC50 < 500 nM (bortolin2024antisenseoligonucleotidetherapy pages 5-6).
  • At 1.7–5 μM, selected ASOs reduced CALM1 transcript with little effect on CALM2/3; ~50% CALM1 depletion was achieved at 5 μM by day 3 in one lead, without significant change in total CaM protein (bortolin2024antisenseoligonucleotidetherapy pages 5-6).
  • In CALM1^F142L/+ iPSC-cardiomyocytes, ASO treatment normalized prolonged repolarization phenotypes (field potential duration/action potential duration) toward wild-type and shortened Ca2+ transient duration (bortolin2024antisenseoligonucleotidetherapy pages 5-6, bortolin2024antisenseoligonucleotidetherapy pages 3-5).

Although this therapy targeted CALM1, it is directly relevant to Calm3 functional annotation because it demonstrates that the protein product is redundant across genes, while transcripts are individually targetable, reinforcing the importance of Calm3-specific post-transcriptional control.

3. Current applications and real-world implementations

3.1 Therapeutic implementation direction: calmodulinopathy mitigation by gene-selective knockdown

The ASO strategy above is a concrete translational implementation: it leverages the fact that three genes encode identical CaM protein and proposes that reducing expression of a mutant-allele gene can restore cellular electrophysiology without depleting total CaM (bortolin2024antisenseoligonucleotidetherapy pages 3-5). This approach is currently in preclinical development using iPSC-derived cardiomyocytes and mouse models (bortolin2024antisenseoligonucleotidetherapy pages 3-5).

3.2 Pharmacological manipulation as a research/physiology implementation

In gap junction research, CaM inhibitors are used to test CaM’s role in chemical gating and to discriminate CaM-mediated vs direct Ca2+ mechanisms; the 2024 review emphasizes such inhibitor evidence as a key class supporting the Ca2+-CaM “cork” gating model (peracchia2024calciumrolein pages 1-2, peracchia2024calciumrolein pages 18-19). While not a therapeutic implementation per se, this is a mature real-world experimental strategy used in physiology.

4. Functional annotation: molecular function, pathways, and localization

4.1 Primary molecular function of the Calm3 gene product (protein-level)

Because Calm3 encodes canonical CaM protein, the primary molecular function is Ca2+ binding via EF-hands and Ca2+-dependent regulation of target proteins (hussey2023calmodulinmutationsin pages 1-2, sobue2024calmodulinahighly pages 2-4, denesyuk2023canonicalstructuralbindingmodes pages 1-5). CaM does not catalyze a chemical reaction (it is not an enzyme); instead, it acts as an allosteric regulator/adaptor whose Ca2+-loaded or apo states modulate target conformation, gating, or enzymatic activity.

4.2 Calm3-specific functional specialization: post-transcriptional localization of Calm3 mRNA in neurons

The most direct, gene-specific functional evidence for mouse Calm3 is at the RNA level. A high-impact primary study found that a long Calm3 isoform (Calm3L) contains a retained intron in the 3′UTR that recruits the RNA-binding protein Staufen2 (Stau2) and mediates activity-dependent localization to dendrites (sharangdhar2017aretainedintron pages 2-3, sharangdhar2017aretainedintron pages 1-2).

Key results and data types:

  • Stau2 iCLIP in E18 mouse brain identified 356 neuronal mRNAs with Stau2 binding in 3′UTRs; in 28 mRNAs, binding sites were within retained 3′UTR introns, and Calm3 was the top target of this class, accounting for 0.24% of all mRNA iCLIP tags (sharangdhar2017aretainedintron pages 2-3).
  • Stau2 binding was specific to Calm3 and absent for Calm1/Calm2 in this iCLIP analysis (no crosslink clusters for the paralogs), supporting a Calm3-specific regulatory program rather than a generic calmodulin property (sharangdhar2017aretainedintron pages 2-3).
  • Calm3L’s 3′UTR had six Stau2 crosslink clusters, with four overlapping the retained intron; the major cluster was adjacent to a predicted RNA duplex, consistent with a structural binding mechanism (sharangdhar2017aretainedintron pages 1-2).
  • Functional localization: Calm3L (intron-containing) localized to neuronal dendrites, while intron removal impaired dendritic localization. Stau2 knockdown reduced dendritic localization and increased nuclear retention of Calm3L without changing total Calm3L abundance, indicating regulation of mRNA localization rather than stability; rescue with RNAi-resistant Stau2 restored localization (sharangdhar2017aretainedintron pages 8-9, sharangdhar2017aretainedintron pages 1-2).
  • Activity dependence: NMDA receptor activation promoted Calm3L dendritic localization, while synaptic silencing reduced it, linking Calm3 localization to neuronal activity (sharangdhar2017aretainedintron pages 1-2, sharangdhar2017aretainedintron pages 4-5).

Interpretation for functional annotation: Calm3 may contribute to spatially restricted CaM availability in dendrites (e.g., via local translation), aligning with the broader concept that CaM function is sensitive to subcellular localization and local Ca2+ microdomains (sobue2024calmodulinahighly pages 2-4, sharangdhar2017aretainedintron pages 1-2).

4.3 Key pathways and representative targets in mammals (Calm3-encoded protein participates)

Authoritative synthesis and disease-focused review evidence identify major CaM-regulated pathways and targets including:

  • CaM-dependent kinases (CaMKI/II/III/IV) and their role in diverse cellular outputs; CaMKII is emphasized as abundant in forebrain postsynapses (sobue2024calmodulinahighly pages 2-4).
  • Calcineurin signaling controlling NFAT nuclear translocation and gene expression (sobue2024calmodulinahighly pages 2-4).
  • Regulation of ion channels involved in excitability and Ca2+ homeostasis, including L-type Ca2+ channels (CaV1.2) and intracellular Ca2+ release channels (RyR2, IP3 receptors), as well as SK channels (hussey2023calmodulinmutationsin pages 1-2, hussey2023calmodulinmutationsin pages 4-6).
  • Connexin gap junction gating via Ca2+-CaM mechanisms (peracchia2024calciumrolein pages 13-15, peracchia2024calciumrolein pages 1-2).
  • TRPM channel modulation: a 2023 review states that TRPM2, TRPM3, TRPM4, and TRPM6 are directly modulated by CaM, with mapped CaM-binding domains in TRPM channels and channel-specific outcomes that may involve activation or inhibition depending on Ca2+ context (bousova2023interactionofcalmodulin pages 1-2). Mapped examples include an IQ-like motif and a temperature-sensitive NUDT9H-domain CaM-binding site for TRPM2 and multiple N-terminal CaM binding sites for TRPM3 (bousova2023interactionofcalmodulin pages 9-11, bousova2023interactionofcalmodulin pages 8-9).

5. Expert opinions and analysis (authoritative sources)

5.1 Expert synthesis: localization and context determine CaM outputs

An expert 2024 review emphasizes that although CaM is broadly expressed and has hundreds of targets, physiological meaning depends on intracellular localization and Ca2+ sensitivity of individual interactions (sobue2024calmodulinahighly pages 2-4). This supports an interpretation that Calm3-specific mRNA dendritic targeting could tune where CaM is available for signaling.

5.2 Expert synthesis: strong support for Ca2+-CaM-mediated gap junction gating

A 2024 review explicitly argues that “multiple experimental approaches” over decades demonstrate that chemical gating of gap junction channels is Ca2+-CaM-mediated, and critiques competing direct Ca2+-connexin models for using non-physiological Ca2+ concentrations (e.g., 20 mM) (peracchia2024calciumrolein pages 13-15, peracchia2024calciumrolein pages 1-2). The author’s analysis integrates pharmacology, imaging, mutagenesis, direct binding measurements, and physiology to support the CaM “cork” mechanism (peracchia2024calciumrolein pages 18-19).

6. Relevant statistics and data from recent studies

  • CaM lobe Ca2+ affinity (representative values): C-lobe KD ~2.4 µM vs N-lobe KD ~16 µM (hussey2023calmodulinmutationsin pages 1-2).
  • Connexin peptide–CaM binding (2024 synthesis): peptide–CaM KD ~0.7–1 µM, and peptide binding shifts CaM Ca2+ KD from 2.9 ± 0.1 µM to 1.6 ± 0.1 µM (peracchia2024calciumrolein pages 11-13).
  • Gap junction functional effect size: ionomycin-induced Ca2+ rise reduced junctional conductance by 95%, preventable by CaM inhibition (peracchia2024calciumrolein pages 11-13).
  • Calm3–Stau2 targeting strength: Calm3 was the top retained-intron Stau2 target in mouse brain iCLIP, contributing 0.24% of all mRNA iCLIP tags (sharangdhar2017aretainedintron pages 2-3).
  • Therapeutic ASO performance (2024): lead CALM1-selective ASOs had IC50 < 500 nM; ~50% CALM1 transcript depletion at 5 µM without significant total CaM protein decrease; functional normalization of repolarization phenotypes in iPSC-cardiomyocytes (bortolin2024antisenseoligonucleotidetherapy pages 5-6).

Evidence map (quick reference)

The following table consolidates the evidence supporting Calm3’s functional annotation, including 2023–2024 highlights and key quantitative values.

Aspect Evidence summary with key quantitative details Key sources (year, journal) and URLs
identity/structure Mouse Calm3 corresponds to calmodulin-3 (UniProt P0DP28) from Mus musculus. Calmodulin is a 149-aa, ~17 kDa EF-hand Ca2+ sensor with two globular lobes (N and C) linked by a flexible helix/linker; each lobe contains two EF-hand Ca2+-binding motifs (4 total). Mammals have three calmodulin genes (CALM1, CALM2, CALM3) that encode an identical CaM protein sequence, while differing in regulatory regions/expression (hussey2023calmodulinmutationsin pages 1-2, denesyuk2023canonicalstructuralbindingmodes pages 1-5, reed2015calm3mutationassociated pages 2-4, boczek2016spectrumandprevalence pages 1-3, gruner2019preciseremovalof pages 1-4). Hussey et al., 2023, Channels — https://doi.org/10.1080/19336950.2023.2165278; Denesyuk et al., 2023, J Biomol Struct Dyn — https://doi.org/10.1080/07391102.2022.2123391; Reed et al., 2015, Heart Rhythm — https://doi.org/10.1016/j.hrthm.2014.10.035; Boczek et al., 2016, Circ Cardiovasc Genet — https://doi.org/10.1161/circgenetics.115.001323
Ca2+ sensing Calmodulin is a ubiquitous intracellular Ca2+ sensor that transduces cytosolic Ca2+ rises from about 10^-7 M at rest to 10^-6–10^-5 M after stimulation. The C-lobe has higher Ca2+ affinity than the N-lobe (KD ~2.4 µM vs ~16 µM), supporting semi-independent lobe behavior and target-specific decoding of Ca2+ signals (hussey2023calmodulinmutationsin pages 1-2, sobue2024calmodulinahighly pages 2-4). Hussey et al., 2023, Channels — https://doi.org/10.1080/19336950.2023.2165278; Sobue, 2024, Proc Jpn Acad Ser B — https://doi.org/10.2183/pjab.100.025
binding/recognition Ca2+ binding opens both lobes and exposes hydrophobic pockets. CaM-binding motifs in targets commonly contain hydrophobic anchor residues separated by 10–17 residues (motifs such as 1-10, 1-14, 1-16, 1-17), with an added 1-5 contribution in structural surveys. Methionine-rich hydrophobic patches are central to target recognition; key residues include Met51/71/72 and C-lobe equivalents Met124/144/145, and methionines contribute about 46% of the accessible hydrophobic patch area in analyzed complexes. Representative CaM-target peptide affinities can be Kd < 10^-7 M (denesyuk2023canonicalstructuralbindingmodes pages 5-8, denesyuk2023canonicalstructuralbindingmodes pages 1-5). Denesyuk et al., 2023, J Biomol Struct Dyn — https://doi.org/10.1080/07391102.2022.2123391
key targets/pathways CaM regulates major mammalian signaling modules including CaMKI/II/III/IV, calcineurin-NFAT, MLCK, CaV1.2/L-type Ca2+ channels, RyR2, IP3 receptors, SK/IK channels, NMDA receptor NR1, connexins/gap junctions, and TRPM-family channels (hussey2023calmodulinmutationsin pages 1-2, hussey2023calmodulinmutationsin pages 4-6, sobue2024calmodulinahighly pages 2-4). In disease-focused work, disturbed CaM control of CaV1.2 CDI and RyR2 is strongly implicated in calmodulinopathy phenotypes (tsai2025enrichmentofmutant pages 36-43, tsai2025enrichmentofmutant pages 18-22). For TRPM channels, recent review evidence indicates direct or mapped CaM regulation for TRPM2, TRPM3, TRPM4, TRPM6 (overview) and mapped sites including an IQ-like N-terminal motif and NUDT9H-domain site in TRPM2 plus five N-terminal CaMBSs in TRPM3; TRPM4 and TRPM8 are summarized as showing activation/inhibition contexts in review tables (bousova2023interactionofcalmodulin pages 9-11, bousova2023interactionofcalmodulin pages 4-6, bousova2023interactionofcalmodulin pages 1-2). Hussey et al., 2023, Channels — https://doi.org/10.1080/19336950.2023.2165278; Sobue, 2024, Proc Jpn Acad Ser B — https://doi.org/10.2183/pjab.100.025; Bousova et al., 2023, Int J Mol Sci — https://doi.org/10.3390/ijms242015162; Tsai et al., 2025, JCI Insight — https://doi.org/10.1172/jci.insight.185524
localization CaM functions in multiple intracellular compartments and target microdomains: cytosol, post-synaptic/membrane-associated regions, and in association with ion channels, cytoskeleton, and enzyme complexes. In neurons, Calm3 long-isoform mRNA is enriched in the somatodendritic compartment and MAP2-positive dendrites, indicating local translation/regulation potential for CaM signaling in dendrites (sobue2024calmodulinahighly pages 2-4, sharangdhar2017aretainedintron pages 2-3, sharangdhar2017aretainedintron pages 1-2). In cardiac cells, evidence supports distinct free and bound CaM pools and local action near membrane/organellar Ca2+-handling proteins (tsai2025enrichmentofmutant pages 36-43). Sobue, 2024, Proc Jpn Acad Ser B — https://doi.org/10.2183/pjab.100.025; Sharangdhar et al., 2017, EMBO Rep — https://doi.org/10.15252/embr.201744334; Tsai et al., 2025, JCI Insight — https://doi.org/10.1172/jci.insight.185524
Calm3-specific regulation The strongest isoform-specific evidence for mouse Calm3 is post-transcriptional. Stau2 iCLIP identified Calm3 as the top Stau2 target with a retained 3′UTR intron (0.24% of all mRNA iCLIP tags), with six Stau2 crosslink clusters in the long isoform and four overlapping the retained intron; Calm1/Calm2 lacked crosslink clusters in this analysis (sharangdhar2017aretainedintron pages 2-3, sharangdhar2017aretainedintron pages 1-2). Functionally, the intron-containing Calm3L isoform localized to dendrites, whereas the intron-lacking isoform did not; Stau2 knockdown reduced dendritic localization and increased nuclear retention without changing total Calm3L abundance, and NMDA stimulation promoted dendritic localization while chronic silencing reduced it (sharangdhar2017aretainedintron pages 8-9, sharangdhar2017aretainedintron pages 1-2, sharangdhar2017aretainedintron pages 4-5, sharangdhar2017aretainedintron pages 6-8). Sharangdhar et al., 2017, EMBO Rep — https://doi.org/10.15252/embr.201744334
2023-2024 advances Recent work sharpened current understanding rather than redefining core function. A 2023 structural survey systematized canonical CaM-binding modes and highlighted the methionine-layer/1-5 plus 1-10 to 1-17 motif framework for target recognition (denesyuk2023canonicalstructuralbindingmodes pages 5-8, denesyuk2023canonicalstructuralbindingmodes pages 1-5). The 2024 Sobue review synthesized CaM as a ubiquitous Ca2+ sensor with >300 binding partners and emphasized localization-dependent signaling outputs (sobue2024calmodulinahighly pages 2-4). A 2024 review on gap-junction gating argued that connexin chemical gating operates in the high-nanomolar to low-micromolar [Ca2+]i range through Ca2+-CaM, not direct Ca2+-connexin binding; representative data include CaM-peptide KD ~0.7–1 µM, Ca2+ affinity shift from 2.9 ± 0.1 µM to 1.6 ± 0.1 µM on peptide binding, and 95% junctional conductance reduction after ionomycin that was blocked by CaM inhibition (peracchia2024calciumrolein pages 11-13, peracchia2024calciumrolein pages 13-15, peracchia2024calciumrolein pages 1-2). A 2023 TRPM review consolidated directly modulated channels/sites and highlighted unresolved channel-specific mechanisms (bousova2023interactionofcalmodulin pages 9-11, bousova2023interactionofcalmodulin pages 4-6). Denesyuk et al., 2023, J Biomol Struct Dyn — https://doi.org/10.1080/07391102.2022.2123391; Sobue, 2024, Proc Jpn Acad Ser B — https://doi.org/10.2183/pjab.100.025; Peracchia, 2024, Int J Mol Sci — https://doi.org/10.3390/ijms25189789; Bousova et al., 2023, Int J Mol Sci — https://doi.org/10.3390/ijms242015162
applications/translation A notable translational advance is gene-selective antisense therapy for calmodulinopathy. In human CALM1^F142L/+ iPSC-cardiomyocytes, CALM1-selective ASOs with >3 mismatches to CALM2/3 were screened; selected ASOs had IC50 < 500 nM, and at 1.7–5 µM selectively reduced CALM1 transcript while sparing CALM2/3. ASO4 achieved about 50% CALM1 depletion at 5 µM by day 3 yet did not significantly change total CaM protein, and normalized prolonged repolarization/Ca2+-transient phenotypes toward wild type. In mice, >300 murine ASOs were screened, top leads gave >85% in vitro reduction, and a selected palmitate-conjugated ASO alleviated drug-induced ventricular tachycardia in Calm1^N98S/+ mice without evident adverse cardiac electrical/contractile effects (bortolin2024antisenseoligonucleotidetherapy pages 5-6, bortolin2024antisenseoligonucleotidetherapy pages 3-5). These studies support a practical principle also relevant to Calm3 biology: the three calmodulin genes can provide protein-level redundancy while gene-specific transcripts remain druggable (tsai2025enrichmentofmutant pages 1-6). Bortolin et al., 2024, Circulation — https://doi.org/10.1161/circulationaha.123.068111; Tsai et al., 2025, JCI Insight — https://doi.org/10.1172/jci.insight.185524

Table: This table summarizes evidence-based functional annotation for mouse Calm3/calmodulin-3, integrating core calmodulin biology with the strongest Calm3-specific regulatory findings. It highlights identity verification, molecular function, pathways, localization, recent advances, and translational relevance with inline context-ID citations.

Limitations and scope notes (to avoid over-interpretation)

  • Calm3-specific protein function vs gene-level regulation: Because Calm1/2/3 encode identical CaM protein, isoform-specific physiological roles will often be due to expression level, transcript localization, UTR regulation, or allele-specific perturbation, rather than differences in amino-acid sequence (reed2015calm3mutationassociated pages 2-4, gruner2019preciseremovalof pages 1-4).
  • Mouse Calm3 genetic phenotypes: In the retrieved evidence, direct Calm3-only knockout phenotypes in mouse were not identified. The strongest Calm3-specific experimental support is post-transcriptional neuronal mRNA localization mediated by the retained 3′UTR intron and Stau2 (sharangdhar2017aretainedintron pages 2-3, sharangdhar2017aretainedintron pages 1-2).

Key cited sources (with URLs and publication dates where available)

  • Hussey JW, Limpitikul WB, Dick IE. Calmodulin Mutations in Human Disease. Channels. Jan 2023. https://doi.org/10.1080/19336950.2023.2165278 (hussey2023calmodulinmutationsin pages 1-2, hussey2023calmodulinmutationsin pages 4-6)
  • Denesyuk AI et al. Canonical structural-binding modes in the calmodulin–target protein complexes. Journal of Biomolecular Structure and Dynamics. Sep 2023. https://doi.org/10.1080/07391102.2022.2123391 (denesyuk2023canonicalstructuralbindingmodes pages 5-8, denesyuk2023canonicalstructuralbindingmodes pages 1-5)
  • Bousova KV et al. Interaction of Calmodulin with TRPM: An Initiator of Channel Modulation. International Journal of Molecular Sciences. Oct 2023. https://doi.org/10.3390/ijms242015162 (bousova2023interactionofcalmodulin pages 4-6, bousova2023interactionofcalmodulin pages 1-2)
  • Sobue K. Calmodulin: a highly conserved and ubiquitous Ca2+ sensor. Proceedings of the Japan Academy, Series B. Jul 2024. https://doi.org/10.2183/pjab.100.025 (sobue2024calmodulinahighly pages 2-4)
  • Peracchia C. Calcium Role in Gap Junction Channel Gating: Direct Electrostatic or Calmodulin-Mediated? International Journal of Molecular Sciences. Sep 2024. https://doi.org/10.3390/ijms25189789 (peracchia2024calciumrolein pages 13-15, peracchia2024calciumrolein pages 1-2)
  • Bortolin RH et al. Antisense Oligonucleotide Therapy for Calmodulinopathy. Circulation. Oct 2024. https://doi.org/10.1161/circulationaha.123.068111 (bortolin2024antisenseoligonucleotidetherapy pages 5-6, bortolin2024antisenseoligonucleotidetherapy pages 3-5)
  • Sharangdhar T et al. A retained intron in the 3′-UTR of Calm3 mRNA mediates its Staufen2- and activity-dependent localization to neuronal dendrites. EMBO Reports. Oct 2017. https://doi.org/10.15252/embr.201744334 (sharangdhar2017aretainedintron pages 2-3, sharangdhar2017aretainedintron pages 1-2)
  • Reed GJ et al. CALM3 mutation associated with long QT syndrome. Heart Rhythm. Feb 2015. https://doi.org/10.1016/j.hrthm.2014.10.035 (reed2015calm3mutationassociated pages 2-4, reed2015calm3mutationassociated pages 4-4)

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  13. (bortolin2024antisenseoligonucleotidetherapy pages 3-5): Raul H. Bortolin, Farina Nawar, Chaehyoung Park, Michael A. Trembley, Maksymilian Prondzynski, Mason E. Sweat, Peizhe Wang, Jiehui Chen, Fujian Lu, Carter Liou, Paul Berkson, Erin M. Keating, Daisuke Yoshinaga, Nikoleta Pavlaki, Thomas Samenuk, Cecilia B. Cavazzoni, Peter T. Sage, Qing Ma, Robert D. Whitehill, Dominic J. Abrams, Chrystalle Katte Carreon, Juan Putra, Sanda Alexandrescu, Shuai Guo, Wen-Chin Tsai, Michael Rubart, Dieter A. Kubli, Adam E. Mullick, Vassilios J. Bezzerides, and William T. Pu. Antisense oligonucleotide therapy for calmodulinopathy. Circulation, 150:1199-1210, Oct 2024. URL: https://doi.org/10.1161/circulationaha.123.068111, doi:10.1161/circulationaha.123.068111. This article has 12 citations and is from a highest quality peer-reviewed journal.

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  15. (sharangdhar2017aretainedintron pages 2-3): Tejaswini Sharangdhar, Yoichiro Sugimoto, Jacqueline Heraud‐Farlow, Sandra M Fernández‐Moya, Janina Ehses, Igor Ruiz de los Mozos, Jernej Ule, and Michael A Kiebler. A retained intron in the 3′‐utr of calm3 mrna mediates its staufen2‐ and activity‐dependent localization to neuronal dendrites. EMBO reports, 18:1762-1774, Oct 2017. URL: https://doi.org/10.15252/embr.201744334, doi:10.15252/embr.201744334. This article has 97 citations and is from a highest quality peer-reviewed journal.

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  17. (sharangdhar2017aretainedintron pages 8-9): Tejaswini Sharangdhar, Yoichiro Sugimoto, Jacqueline Heraud‐Farlow, Sandra M Fernández‐Moya, Janina Ehses, Igor Ruiz de los Mozos, Jernej Ule, and Michael A Kiebler. A retained intron in the 3′‐utr of calm3 mrna mediates its staufen2‐ and activity‐dependent localization to neuronal dendrites. EMBO reports, 18:1762-1774, Oct 2017. URL: https://doi.org/10.15252/embr.201744334, doi:10.15252/embr.201744334. This article has 97 citations and is from a highest quality peer-reviewed journal.

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  19. (hussey2023calmodulinmutationsin pages 4-6): John W. Hussey, Worawan B. Limpitikul, and Ivy E. Dick. Calmodulin mutations in human disease. Channels, Jan 2023. URL: https://doi.org/10.1080/19336950.2023.2165278, doi:10.1080/19336950.2023.2165278. This article has 48 citations and is from a peer-reviewed journal.

  20. (bousova2023interactionofcalmodulin pages 1-2): Kristyna Vydra Bousova, Monika Zouharova, Katerina Jiraskova, and Veronika Vetyskova. Interaction of calmodulin with trpm: an initiator of channel modulation. International Journal of Molecular Sciences, 24:15162, Oct 2023. URL: https://doi.org/10.3390/ijms242015162, doi:10.3390/ijms242015162. This article has 10 citations.

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  23. (boczek2016spectrumandprevalence pages 1-3): Nicole J. Boczek, Nieves Gomez-Hurtado, Dan Ye, Melissa L. Calvert, David J. Tester, Dmytro O. Kryshtal, Hyun Seok Hwang, Christopher N. Johnson, Walter J. Chazin, Christina G. Loporcaro, Maully Shah, Andrew L. Papez, Yung R. Lau, Ronald Kanter, Björn C. Knollmann, and Michael J. Ackerman. Spectrum and prevalence of calm1 -, calm2 -, and calm3 -encoded calmodulin variants in long qt syndrome and functional characterization of a novel long qt syndrome–associated calmodulin missense variant, e141g. Circulation: Cardiovascular Genetics, 9:136-146, Apr 2016. URL: https://doi.org/10.1161/circgenetics.115.001323, doi:10.1161/circgenetics.115.001323. This article has 167 citations.

  24. (tsai2025enrichmentofmutant pages 36-43): Wen-Chin Tsai, Chiu-Fen Yang, Shu-Yu Lin, Suh-Yuen Liang, Wei-Chung Tsai, Shuai Guo, Xiaochun Li, Susan Ofner, Kai-Chien Yang, Tzu-Ching Meng, Peng-Sheng Chen, and Michael Rubart. Enrichment of mutant calmodulin protein in a murine model of a human calmodulinopathy. JCI Insight, Jul 2025. URL: https://doi.org/10.1172/jci.insight.185524, doi:10.1172/jci.insight.185524. This article has 0 citations and is from a domain leading peer-reviewed journal.

  25. (tsai2025enrichmentofmutant pages 18-22): Wen-Chin Tsai, Chiu-Fen Yang, Shu-Yu Lin, Suh-Yuen Liang, Wei-Chung Tsai, Shuai Guo, Xiaochun Li, Susan Ofner, Kai-Chien Yang, Tzu-Ching Meng, Peng-Sheng Chen, and Michael Rubart. Enrichment of mutant calmodulin protein in a murine model of a human calmodulinopathy. JCI Insight, Jul 2025. URL: https://doi.org/10.1172/jci.insight.185524, doi:10.1172/jci.insight.185524. This article has 0 citations and is from a domain leading peer-reviewed journal.

  26. (bousova2023interactionofcalmodulin pages 4-6): Kristyna Vydra Bousova, Monika Zouharova, Katerina Jiraskova, and Veronika Vetyskova. Interaction of calmodulin with trpm: an initiator of channel modulation. International Journal of Molecular Sciences, 24:15162, Oct 2023. URL: https://doi.org/10.3390/ijms242015162, doi:10.3390/ijms242015162. This article has 10 citations.

  27. (sharangdhar2017aretainedintron pages 6-8): Tejaswini Sharangdhar, Yoichiro Sugimoto, Jacqueline Heraud‐Farlow, Sandra M Fernández‐Moya, Janina Ehses, Igor Ruiz de los Mozos, Jernej Ule, and Michael A Kiebler. A retained intron in the 3′‐utr of calm3 mrna mediates its staufen2‐ and activity‐dependent localization to neuronal dendrites. EMBO reports, 18:1762-1774, Oct 2017. URL: https://doi.org/10.15252/embr.201744334, doi:10.15252/embr.201744334. This article has 97 citations and is from a highest quality peer-reviewed journal.

  28. (tsai2025enrichmentofmutant pages 1-6): Wen-Chin Tsai, Chiu-Fen Yang, Shu-Yu Lin, Suh-Yuen Liang, Wei-Chung Tsai, Shuai Guo, Xiaochun Li, Susan Ofner, Kai-Chien Yang, Tzu-Ching Meng, Peng-Sheng Chen, and Michael Rubart. Enrichment of mutant calmodulin protein in a murine model of a human calmodulinopathy. JCI Insight, Jul 2025. URL: https://doi.org/10.1172/jci.insight.185524, doi:10.1172/jci.insight.185524. This article has 0 citations and is from a domain leading peer-reviewed journal.

Citations

  1. sobue2024calmodulinahighly pages 2-4
  2. hussey2023calmodulinmutationsin pages 1-2
  3. denesyuk2023canonicalstructuralbindingmodes pages 1-5
  4. peracchia2024calciumrolein pages 11-13
  5. bortolin2024antisenseoligonucleotidetherapy pages 3-5
  6. bortolin2024antisenseoligonucleotidetherapy pages 5-6
  7. sharangdhar2017aretainedintron pages 2-3
  8. sharangdhar2017aretainedintron pages 1-2
  9. bousova2023interactionofcalmodulin pages 1-2
  10. peracchia2024calciumrolein pages 18-19
  11. tsai2025enrichmentofmutant pages 36-43
  12. tsai2025enrichmentofmutant pages 1-6
  13. gruner2019preciseremovalof pages 1-4
  14. denesyuk2023canonicalstructuralbindingmodes pages 5-8
  15. peracchia2024calciumrolein pages 13-15
  16. peracchia2024calciumrolein pages 1-2
  17. peracchia2024calciumrolein pages 4-6
  18. sharangdhar2017aretainedintron pages 8-9
  19. sharangdhar2017aretainedintron pages 4-5
  20. hussey2023calmodulinmutationsin pages 4-6
  21. bousova2023interactionofcalmodulin pages 9-11
  22. bousova2023interactionofcalmodulin pages 8-9
  23. boczek2016spectrumandprevalence pages 1-3
  24. tsai2025enrichmentofmutant pages 18-22
  25. bousova2023interactionofcalmodulin pages 4-6
  26. sharangdhar2017aretainedintron pages 6-8
  27. Ca2+
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Notes

(Calm3-notes.md)

Calm3 (Mouse) — Research Notes

Overview

Mouse Calm3 (UniProt: P0DP28) encodes calmodulin-3, one of three mouse calmodulin genes (Calm1, Calm2, Calm3) that all produce an identical 149 aa, ~17 kDa protein [Hussey et al. 2023, Channels PMID:36692125]. The proteins differ only at the locus level (noncoding regulatory regions, transcript isoforms, expression timing/location). This makes ISO transfers from human CALM1/CALM2/CALM3 biochemically valid at the protein level, but means Calm3-specific biology must be sought at the regulatory/post-transcriptional level.

Core Protein Function (shared across all three CaM genes)

Calmodulin is a ubiquitous intracellular Ca2+ sensor that transduces cytosolic Ca2+ changes into altered target protein activity [Sobue 2024, Proc Jpn Acad Ser B https://doi.org/10.2183/pjab.100.025]. It has >300 target proteins.

  • Structure: Two globular lobes (N and C), each with two EF-hand Ca2+-binding motifs (4 total). Connected by flexible linker.
  • Ca2+ affinities: C-lobe KD ~2.4 µM (higher affinity), N-lobe KD ~16 µM — allows differential decoding of Ca2+ signals.
  • Target recognition: Methionine-rich hydrophobic surfaces (Met51, Met71, Met72; C-lobe: Met124, Met144, Met145) engage target CaM-binding motifs with hydrophobic anchors spaced 10–17 residues apart (motif classes 1-10, 1-14, 1-16, 1-17) [Denesyuk et al. 2023, J Biomol Struct Dyn https://doi.org/10.1080/07391102.2022.2123391].

Key downstream targets/pathways (all three CaM genes contribute):

  • CaMKI/II/III/IV kinases (CaMKII especially abundant in forebrain postsynapses)
  • Calcineurin → NFAT signaling
  • CaV1.2 (L-type Ca2+ channels) — Ca2+-dependent inactivation (CDI)
  • RyR2, IP3 receptors — intracellular Ca2+ release channels
  • SK/IK channels — small conductance Ca2+-activated K+ channels
  • Gap junction gating via connexins (Ca2+-CaM "cork" mechanism, connexin CL2 peptide KD ~0.7–1 µM) [Peracchia 2024, Int J Mol Sci https://doi.org/10.3390/ijms25189789]
  • TRPM2, TRPM3, TRPM4, TRPM6 channels [Bousova et al. 2023, Int J Mol Sci https://doi.org/10.3390/ijms242015162]

Calm3-Specific Biology: Dendritic mRNA Localization

The most important and well-established Calm3-specific finding is at the RNA level, not the protein level.

Sharangdhar et al. 2017 EMBO Rep [PMID:28765142, https://doi.org/10.15252/embr.201744334]:

  • Performed Staufen2 (Stau2) iCLIP on E18 mouse brain. Stau2 is a dsRNA-binding protein that localizes mRNAs to neuronal dendrites.
  • Identified 356 neuronal mRNAs with Stau2 binding in 3'-UTRs; 28 (7.9%) had binding in retained 3'-UTR introns.
  • Calm3 was the top Stau2 iCLIP target in this class, accounting for 0.24% of all mRNA iCLIP tags — a striking enrichment.
  • The long Calm3 isoform (Calm3L) has a retained intron in its 3'-UTR with six Stau2 crosslink clusters, four of which are within the retained intron.
  • Calm1 and Calm2 lacked Stau2 crosslink clusters entirely in this analysis — this is the key paralog-specific distinction.
  • Functionally: Calm3L (with intron) localized to MAP2-positive dendrites; intron removal impaired dendritic localization.
  • Stau2 knockdown reduced dendritic localization and increased nuclear retention WITHOUT changing total Calm3L abundance (regulation of localization, not stability).
  • NMDA receptor activation specifically promoted Calm3L dendritic localization; synaptic silencing reduced it.

Interpretation: Calm3 may contribute to spatially restricted CaM availability in dendrites via local translation, tuning synaptic Ca2+ signaling in an activity-dependent manner.

Calyx of Held / Presynaptic Endocytosis — Attribution Issue

PMID:31628181 (Jin et al. 2019, J Neurosci) is cited for IMP/NAS annotations on Calm3 for calyx of Held synaptic vesicle endocytosis. However, this paper explicitly used Calm2 KO mice, not Calm3 KO. The annotations on Calm3 (P0DP28) are made by protein identity (all three CaM proteins are identical), not by direct Calm3 genetic manipulation. This was flagged in the review — presynaptic annotations were kept as KEEP_AS_NON_CORE with explanation.

ISO Transfer Context

Mouse Calm3 receives ISO annotations from two sources:
1. GO_REF:0000119 (mouse-human ortholog pipeline) — transfers from human CALM1 (UniProtKB:P0DP25)
2. GO_REF:0000096 (mouse-rat ortholog pipeline) — transfers from rat calmodulins (RGD:2257, 2258, 2259)

Since all calmodulin proteins are 100% identical across paralogs and orthologs, ISO transfers are biochemically valid. The review question shifts to whether they add paralog-specific signal. Most ISO terms on Calm3 represent legitimate calmodulin biology and were ACCEPTED or KEEP_AS_NON_CORE based on whether they represent core vs. peripheral functions.

Therapeutic and Clinical Relevance

  • CALM3 mutations (e.g., D130G, F142L) cause calmodulinopathy — severe LQT syndrome and catecholaminergic polymorphic ventricular tachycardia (CPVT) [Reed et al. 2015, Heart Rhythm https://doi.org/10.1016/j.hrthm.2014.10.035].
  • Gene-selective ASO therapy (2024): CALM1-selective ASOs can reduce a mutant CALM1 allele without depleting total CaM protein (compensated by CALM2/CALM3), demonstrating that gene-selective knockdown is feasible while protein levels remain stable [Bortolin et al. 2024, Circulation https://doi.org/10.1161/circulationaha.123.068111].
  • Lead ASOs: IC50 < 500 nM; ~50% CALM1 depletion at 5 µM without changing total CaM protein.
  • Normalized prolonged repolarization in CALM1^F142L/+ iPSC-cardiomyocytes.

  • 85% in vitro reduction with top murine ASOs.

Key Quantitative Data Points

Measurement Value Source
Calm3 iCLIP fraction 0.24% of all mRNA tags Sharangdhar 2017
Stau2 crosslink clusters in Calm3L 3'-UTR 6 total, 4 in retained intron Sharangdhar 2017
CaM C-lobe Ca2+ affinity KD ~2.4 µM Hussey 2023
CaM N-lobe Ca2+ affinity KD ~16 µM Hussey 2023
Connexin peptide–CaM KD ~0.7–1 µM Peracchia 2024
Gap junction conductance reduction (ionomycin) 95% (blocked by CaM inhibitor) Peracchia 2024
ASO IC50 (CALM1-selective) < 500 nM Bortolin 2024

Literature Gaps and Open Questions

  1. No Calm3-specific knockout phenotype described in mouse — all functional data uses generic CaM depletion or Calm2 KO.
  2. Is Calm3L dendritic localization functionally significant for synaptic plasticity? LTP/LTD experiments with Calm3L-specific disruption not yet done.
  3. Does Calm3 preferentially localize to postsynaptic densities vs. presynaptic terminals compared to Calm1/Calm2?
  4. What is the relative contribution of Calm3 vs. Calm1/Calm2 to total synaptic CaM pool?
  5. Are there other brain regions or cell types where Calm3 mRNA regulation differs from paralogs?

📄 View Raw YAML

 
id: P0DP28
gene_symbol: Calm3
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:10090
  label: Mus musculus
description: 'Calmodulin-3 is one of three mouse calmodulin genes (Calm1, Calm2, Calm3) that all
  encode the same 149 aa calcium sensor protein. Calm3 is the most brain-enriched of the three
  paralogs, with high expression in hippocampus, cerebellum, and neurons generally, though the
  protein is broadly expressed. Because all three mouse calmodulin genes produce an identical
  protein, ISO transfers from human CALM1 (P0DP25) — the ortholog source used in GO_REF:0000119
  — are biochemically valid; the protein sequences are 100% identical. ISO transfers from rat
  calmodulin paralogs (GO_REF:0000096) similarly reflect identical protein biology. The key
  ISO-review question is therefore not sequence divergence but whether rat or human paralog-sourced
  annotations add locus-specific signal or merely distribute family-wide annotations across all
  three mouse Calm genes. Core calcium-sensor functions (EF-hand binding, CaMKII/calcineurin
  activation, and ion channel regulation) transfer appropriately and
  are accepted; spindle/centrosome annotations are retained as non-core contexts. Tissue-restricted terms (synaptic, cardiac-specific signaling, sarcomere,
  growth cone) are kept as non-core with exceptions: Calm3 has a unique post-transcriptional
  regulatory feature — the long Calm3 isoform (Calm3L) contains a retained intron in its 3-UTR
  that recruits Staufen2 (Stau2) and drives activity-dependent localization of Calm3 mRNA
  specifically to neuronal dendrites (PMID:28765142). This mechanism is absent for Calm1 and Calm2.
  Stau2 iCLIP in E18 mouse brain showed Calm3 as the top retained-intron Stau2 target (0.24%
  of all tags), while Calm1/Calm2 lack crosslink clusters. NMDA stimulation promotes and synaptic
  silencing reduces this dendritic targeting. This supports a Calm3-specific mRNA-localization
  mechanism, but does not by itself demonstrate Calm3 protein localization to the postsynaptic
  cytosol, so postsynaptic-cytosol annotations are treated as specialized non-core context. The
  calyx-of-Held and presynaptic-endocytosis annotations
  (PMID:31628181) derive from Calm2-knockout experiments, not Calm3, and are treated accordingly.
  Calm3-specific interaction evidence also exists for RYR1, RYR2, SYT7, and IQCF1
  (PubMed:18650434, 24569478, 25380116).'
existing_annotations:
# --- IBA annotations (phylogenetic inference, strong) ---
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Primary cytoplasmic localization shared by all calmodulin proteins
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005509
    label: calcium ion binding
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Core calcium-binding function through 4 EF-hand domains; identical protein to CALM1/2/3
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005634
    label: nucleus
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Nuclear localization is established for calmodulin but is context-specific; not a universal
      Calm3-defining localization
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0010880
    label: regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Regulates RyR-mediated calcium release from SR; supported by direct evidence for RYR1/RYR2
      interaction (PMID:18650434)
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005513
    label: detection of calcium ion
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Core calcium sensing function; canonical calmodulin activity
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0097720
    label: calcineurin-mediated signaling
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Activates calcineurin phosphatase for NFAT-pathway signaling; broadly conserved calmodulin function
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005813
    label: centrosome
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Centrosomal localization for cell division
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0043209
    label: myelin sheath
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: CaM localizes to myelin via MBP interaction (PMID:19855925) but represents neural-specific context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
# --- IEA annotations (electronic inference) ---
- term:
    id: GO:0000086
    label: G2/M transition of mitotic cell cycle
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: Cell cycle regulation at G2/M transition; supported by direct IDA evidence for calmodulin but not a core Calm3 molecular function
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0000922
    label: spindle pole
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Spindle pole localization during mitosis
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0005509
    label: calcium ion binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Core calcium-binding function; redundant with IBA but consistent
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005819
    label: spindle
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  review:
    summary: Spindle localization for cell division
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0006897
    label: endocytosis
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: Endocytosis regulation; synaptic context more specific — parent term too general here
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0051649
    label: establishment of localization in cell
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: Too general; adds no mechanistic specificity for Calm3
    action: KEEP_AS_NON_CORE
    reason: Too general — more specific terms are available
- term:
    id: GO:0098793
    label: presynapse
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: Presynaptic enrichment is plausible given Calm3 brain expression but represents specialized
      neuronal context rather than a universal Calm3 localization
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0150034
    label: distal axon
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: Distal axon localization is neuronal-context specific
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0000785
    label: chromatin
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Chromatin association is not a primary Calm3 localization; carried over from family-wide annotation
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0001975
    label: response to amphetamine
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Amphetamine response in dopaminergic neurons; very context-specific
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0002027
    label: regulation of heart rate
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Heart rate regulation through ion channel modulation is a cardiac physiological context
      of calmodulin channel regulation, not a universal Calm3 core function
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0005246
    label: calcium channel regulator activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Regulates L-type calcium channels, RyR, and other calcium channels; core calmodulin activity
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005513
    label: detection of calcium ion
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Core calcium sensing function; redundant with IBA
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005634
    label: nucleus
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Nuclear localization is context-specific for calmodulin; not a Calm3-defining annotation
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Primary cytoplasmic localization; core
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005813
    label: centrosome
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Centrosomal localization for cell division
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Soluble cytosolic calcium sensor; core
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005876
    label: spindle microtubule
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Spindle microtubule association during mitosis
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0008179
    label: adenylate cyclase binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Calmodulin directly binds calmodulin-sensitive adenylate cyclases (AC1, AC8); broadly conserved
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0010856
    label: adenylate cyclase activator activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Activates calcium-dependent adenylate cyclases for cAMP signaling
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0010880
    label: regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Regulates RyR-mediated calcium release from SR; supported by RYR1/RYR2 interaction evidence
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0010881
    label: regulation of cardiac muscle contraction by regulation of the release of sequestered calcium
      ion
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Cardiac calcium-induced calcium release regulation is consistent with calmodulin regulation
      of RyR channels but is cardiac-specific downstream physiology
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0016240
    label: autophagosome membrane docking
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  review:
    summary: Autophagosome docking; no specific evidence for Calm3 at this process; specialized context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0019855
    label: calcium channel inhibitor activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Inhibitory regulation of certain calcium channels (IP3 receptor inhibition, RyR inhibition
      at high calcium); broadly conserved calmodulin function
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0019901
    label: protein kinase binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Binds CaMKII, CaMKIV, and other calmodulin-dependent kinases; core calmodulin activity
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0019904
    label: protein domain specific binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Parent binding term too generic; does not capture specific calmodulin-recognition motif interactions
    action: MARK_AS_OVER_ANNOTATED
    reason: Too general — more specific terms are available
- term:
    id: GO:0030017
    label: sarcomere
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Sarcomere localization in striated muscle; calmodulin binds titin and myosin light chains;
      tissue-specific context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0030235
    label: nitric-oxide synthase regulator activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Calmodulin activates eNOS, nNOS, and iNOS; plausible but represents specialized context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0030426
    label: growth cone
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Growth cone localization for axon guidance signaling; neuronal-specific context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0030672
    label: synaptic vesicle membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Synaptic vesicle membrane association; neuronal-specific; SYT7 interaction supports synaptic
      context (PMID:24569478) but doesn't establish vesicle membrane localization for Calm3 specifically
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0031432
    label: titin binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Titin binding in muscle; tissue-specific context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0031800
    label: type 3 metabotropic glutamate receptor binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: mGluR3 binding; specific neuronal interaction not directly established for mouse Calm3
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0031966
    label: mitochondrial membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Mitochondrial membrane association; likely contextual localization carried from family-wide
      annotation
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0032465
    label: regulation of cytokinesis
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Cytokinesis regulation with CCP110 and centrin
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0032991
    label: protein-containing complex
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Too generic; adds no specificity beyond targeted complex terms already present
    action: MARK_AS_OVER_ANNOTATED
    reason: Too general — more specific terms are available
- term:
    id: GO:0034704
    label: calcium channel complex
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Component of calcium channel complexes (RyR1, RyR2, L-type Ca2+ channels); core calmodulin
      function supported by direct interaction evidence
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0035458
    label: cellular response to interferon-beta
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  review:
    summary: Interferon-beta response; likely indirect/pathway association; specialized context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0043209
    label: myelin sheath
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Myelin sheath localization; supported by direct IDA evidence (PMID:19855925) for CaM-MBP
      complex in myelin; but Calm3 identity in the study is not established — general calmodulin protein
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0043539
    label: protein serine/threonine kinase activator activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Activates CaMKII, CaMKIV, MLCK, and other calcium-dependent kinases; core calmodulin function
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0043548
    label: phosphatidylinositol 3-kinase binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: PI3K binding; specific signaling interaction not independently established for mouse Calm3
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0044325
    label: transmembrane transporter binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Binds ion channels and transporters; consistent with calmodulin's role in channel regulation
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0046427
    label: positive regulation of receptor signaling pathway via JAK-STAT
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  review:
    summary: JAK-STAT pathway; indirect/computed association; specialized context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0048306
    label: calcium-dependent protein binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Calcium-dependent target protein binding; core calmodulin activity
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0050998
    label: nitric-oxide synthase binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Binding to NOS isoforms; biologically plausible but specialized context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0051412
    label: response to corticosterone
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Corticosterone response in neurons; very specialized, indirect
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0051592
    label: response to calcium ion
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Response to calcium ion; too generic — more specific calcium-sensing and detection terms capture
      the relevant biology
    action: KEEP_AS_NON_CORE
    reason: Too general — more specific terms capture this function better
- term:
    id: GO:0055117
    label: regulation of cardiac muscle contraction
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Cardiac contraction regulation reflects tissue-specific physiology downstream of core
      calmodulin calcium-channel regulation
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0071346
    label: cellular response to type II interferon
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  review:
    summary: Interferon-gamma response; indirect/computed association; specialized context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0072542
    label: protein phosphatase activator activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Activates calcineurin (PP2B) phosphatase; core calmodulin function in Ca2+-calcineurin-NFAT
      signaling
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0097720
    label: calcineurin-mediated signaling
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Calcineurin activation for NFAT signaling; core, redundant with IBA entry
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0098685
    label: Schaffer collateral - CA1 synapse
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Hippocampal CA1 synapse localization; neuronal-specific context; consistent with Calm3 brain
      enrichment but represents specialized rather than universal Calm3 localization
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0098901
    label: regulation of cardiac muscle cell action potential
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Cardiac action potential regulation through L-type Ca channel and KCNQ modulation; well-established
      for calmodulin but cardiac-specific context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0099523
    label: presynaptic cytosol
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Presynaptic cytosol localization; neuronal-specific; relevant for Calm3's synaptic role but
      treats specialized context as universal
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0099524
    label: postsynaptic cytosol
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Postsynaptic cytosol localization; supported by Calm3-specific dendritic mRNA targeting
      via Stau2 (PMID:28765142), but that evidence is for mRNA localization and does not directly
      establish Calm3 protein localization to postsynaptic cytosol
    action: KEEP_AS_NON_CORE
    reason: Neuronal compartment-specific context supported indirectly by Calm3 mRNA localization
- term:
    id: GO:0140056
    label: organelle localization by membrane tethering
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  review:
    summary: Organelle membrane tethering; indirect/computed association
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:1900242
    label: regulation of synaptic vesicle endocytosis
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Synaptic vesicle endocytosis regulation; neuronal-specific; see also IDA/IMP entries from
      PMID:31628181 (Calm2 KO study)
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:1901844
    label: regulation of cell communication by electrical coupling involved in cardiac conduction
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Cardiac electrical coupling regulation; specialized cardiac context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:1902494
    label: catalytic complex
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Too generic; adds no specificity beyond more precise complex and binding terms
    action: MARK_AS_OVER_ANNOTATED
    reason: Too general — more specific terms are available
- term:
    id: GO:1990456
    label: mitochondrion-endoplasmic reticulum membrane tethering
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  review:
    summary: ER-mitochondria contact; indirect/computed association; specialized context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:2000300
    label: regulation of synaptic vesicle exocytosis
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: Synaptic vesicle exocytosis regulation; neuronal-specific; SYT7 interaction (PMID:24569478)
      supports synaptic role but does not establish Calm3-specific exocytosis control
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
# --- ISO annotations (GO_REF:0000119 = mouse-human ortholog transfer from P0DP25/human CALM1;
#     GO_REF:0000096 = mouse-rat paralog transfer from RGD:2257/2258/2259) ---
- term:
    id: GO:1901842
    label: negative regulation of high voltage-gated calcium channel activity
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1 (identical protein); inhibitory regulation of L-type Ca channels
      is well-established for calmodulin and consistent with RyR regulatory roles; transfer is valid
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0000785
    label: chromatin
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs (all three RGD sources carry this term); chromatin
      association is contextual, not a Calm3-defining localization; paralog-sensitive transfer
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer reflects specialized context rather than a Calm3 core role
- term:
    id: GO:0000922
    label: spindle pole
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; spindle pole localization during mitosis
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0002027
    label: regulation of heart rate
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; heart rate regulation through ion channel modulation is
      cardiac physiological context downstream of core calmodulin channel regulation
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0005246
    label: calcium channel regulator activity
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; calcium channel regulation is core calmodulin function; transfer
      is valid and supported by direct RYR1/RYR2 interaction evidence for this protein
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005509
    label: calcium ion binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin; core EF-hand calcium-binding function; valid regardless
      of rat paralog source
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005509
    label: calcium ion binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; core EF-hand calcium-binding function; redundant but valid
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005513
    label: detection of calcium ion
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; core calcium sensing function; transfer is valid
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0005634
    label: nucleus
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; nuclear localization is plausible but context-specific;
      paralog-sensitive transfer does not justify treating as Calm3 core localization
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer reflects specialized context rather than a Calm3 core role
- term:
    id: GO:0005813
    label: centrosome
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; centrosomal localization for cell division
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0005876
    label: spindle microtubule
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; spindle microtubule association during mitosis
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0008179
    label: adenylate cyclase binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; calmodulin binds calmodulin-sensitive adenylate cyclases;
      broadly conserved interaction; valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0010856
    label: adenylate cyclase activator activity
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; activates calcium-dependent adenylate cyclases; valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0010880
    label: regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; SR calcium release via RyR regulation; valid transfer supported
      by direct RYR1/RYR2 interaction evidence (PMID:18650434)
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0010881
    label: regulation of cardiac muscle contraction by regulation of the release of sequestered calcium
      ion
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; cardiac calcium-induced calcium release is valid but
      cardiac-specific downstream physiology rather than a universal Calm3 core function
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0019901
    label: protein kinase binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; calmodulin binds CaMK family and other kinases; broadly
      conserved; valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0019904
    label: protein domain specific binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: Too generic; rat paralog ISO transfer adds no mechanistic specificity for Calm3; same issue
      as the IEA version of this term
    action: MARK_AS_OVER_ANNOTATED
    reason: Too general and supported only by paralog-sensitive ISO transfer
- term:
    id: GO:0030017
    label: sarcomere
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; sarcomere localization in striated muscle; tissue-specific
      context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0030235
    label: nitric-oxide synthase regulator activity
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs (all three RGD sources); NOS regulation is plausible
      but not a Calm3-defining function; paralog-sensitive transfer
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core function
- term:
    id: GO:0030426
    label: growth cone
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from all three rat calmodulin paralogs; growth cone localization is neuronal-specific;
      paralog-sensitive transfer lacking Calm3-specific evidence
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
- term:
    id: GO:0030672
    label: synaptic vesicle membrane
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from all three rat calmodulin paralogs; synaptic vesicle membrane localization
      is neuronal-specific; paralog-sensitive transfer; consistent with SYT7 interaction (PMID:24569478)
      but does not establish Calm3 specifically at this compartment
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
- term:
    id: GO:0031432
    label: titin binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; titin binding in muscle sarcomere; tissue-specific context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0031800
    label: type 3 metabotropic glutamate receptor binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; mGluR3 binding is a specific neuronal interaction
      not directly established for mouse Calm3; paralog-sensitive transfer
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core interaction
- term:
    id: GO:0031966
    label: mitochondrial membrane
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from all three rat calmodulin paralogs; mitochondrial membrane localization
      is contextual; paralog-sensitive transfer lacks Calm3-specific support
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
- term:
    id: GO:0032465
    label: regulation of cytokinesis
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; cytokinesis regulation with CCP110 and centrin
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0032991
    label: protein-containing complex
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: Too generic; adds no specificity beyond more precise complex terms; same concern as IEA version
    action: MARK_AS_OVER_ANNOTATED
    reason: Too general — more specific terms are available
- term:
    id: GO:0034704
    label: calcium channel complex
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; calmodulin is a component of calcium channel complexes;
      supported by direct RYR1/RYR2 interaction evidence; valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0043209
    label: myelin sheath
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; myelin sheath localization supported by IDA (PMID:19855925)
      for CaM-MBP complex; but the study used general CaM, not Calm3-specific; paralog-sensitive transfer
      consistent with specialized context
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
- term:
    id: GO:0043539
    label: protein serine/threonine kinase activator activity
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; activates CaMKII, CaMKIV, MLCK; core calmodulin function;
      valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0043548
    label: phosphatidylinositol 3-kinase binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; PI3K binding is a specific interaction not
      independently established for mouse Calm3; paralog-sensitive transfer
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core interaction
- term:
    id: GO:0044325
    label: transmembrane transporter binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; broad transporter-binding; valid at protein level;
      consistent with channel-regulation function
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0044325
    label: transmembrane transporter binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; binds ion channels and transporters; valid transfer; core
      calmodulin channel-regulation function
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0048306
    label: calcium-dependent protein binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; calcium-dependent target protein binding is
      core calmodulin function; valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0050998
    label: nitric-oxide synthase binding
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; NOS binding is plausible but represents specialized
      context; paralog-sensitive transfer lacks Calm3-specific support
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core interaction
- term:
    id: GO:0051592
    label: response to calcium ion
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; too generic — the detection and sensing terms capture the
      core biology more precisely
    action: KEEP_AS_NON_CORE
    reason: Too general — more specific terms capture this function better
- term:
    id: GO:0055117
    label: regulation of cardiac muscle contraction
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; cardiac contraction regulation is a tissue-specific
      physiological consequence of calmodulin ion-channel regulation
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0072542
    label: protein phosphatase activator activity
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; activates calcineurin (PP2B) phosphatase; core calmodulin
      function; valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0097720
    label: calcineurin-mediated signaling
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; calcineurin activation; redundant with IBA but valid transfer
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0098685
    label: Schaffer collateral - CA1 synapse
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; hippocampal CA1 synapse localization; very specific
      neuronal context; Calm3 is brain-enriched but this level of specificity cannot be assigned solely
      from paralog ISO transfer
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
- term:
    id: GO:0098901
    label: regulation of cardiac muscle cell action potential
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; cardiac action potential regulation; valid transfer but
      specialized cardiac context rather than a universal Calm3 function
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:0099523
    label: presynaptic cytosol
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs (all three sources); presynaptic cytosol localization;
      neuronal-specific; Calm3 brain enrichment makes this plausible but the paralog transfer from all
      three rat Calm genes lacks Calm3-specific evidence
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
- term:
    id: GO:0099524
    label: postsynaptic cytosol
  evidence_type: ISO
  original_reference_id: GO_REF:0000096
  review:
    summary: ISO transfer from rat calmodulin paralogs; Calm3L mRNA is uniquely targeted to neuronal
      dendrites via Stau2 (PMID:28765142), but mRNA localization does not directly demonstrate
      Calm3 protein localization to postsynaptic cytosol
    action: KEEP_AS_NON_CORE
    reason: Paralog-sensitive ISO transfer supports only specialized, non-core localization
- term:
    id: GO:1901844
    label: regulation of cell communication by electrical coupling involved in cardiac conduction
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; cardiac gap junction/conduction regulation; valid transfer
      but specialized cardiac context
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:1902494
    label: catalytic complex
  evidence_type: ISO
  original_reference_id: GO_REF:0000119
  review:
    summary: ISO transfer from human CALM1; too generic; adds no specificity beyond more precise complex
      and binding terms
    action: MARK_AS_OVER_ANNOTATED
    reason: Too general — more specific terms are available
# --- Experimental/curated annotations ---
- term:
    id: GO:0044305
    label: calyx of Held
  evidence_type: NAS
  original_reference_id: PMID:31628181
  review:
    summary: PMID:31628181 used Calm2 knockout mice (not Calm3) to study calcium-stimulated endocytosis
      at calyx of Held synapses; NAS (non-traceable author statement) attribution to Calm3 (P0DP28)
      is based on protein identity; annotation reflects family-level calmodulin biology at this synapse
      rather than Calm3-specific evidence
    action: KEEP_AS_NON_CORE
    reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than direct
      Calm3 experimental evidence
- term:
    id: GO:0044305
    label: calyx of Held
  evidence_type: IMP
  original_reference_id: PMID:31628181
  review:
    summary: PMID:31628181 used Calm2 knockout mice; the IMP annotation is attributed to Calm3
      (P0DP28) based on protein identity but the mutant was Calm2-specific; the phenotype was observed
      in Calm2 KO, not Calm3 KO; kept as non-core consistent with other calyx entries
    action: KEEP_AS_NON_CORE
    reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than
      direct Calm3 experimental evidence
- term:
    id: GO:0044305
    label: calyx of Held
  evidence_type: IDA
  original_reference_id: PMID:31628181
  review:
    summary: IDA from SynGO curation of PMID:31628181; SynGO annotated calmodulin protein presence at
      calyx of Held; calmodulin protein (identical across all three mouse paralogs) is detected at this
      synapse; localization evidence is valid at protein level but Calm3-specificity is not established
    action: KEEP_AS_NON_CORE
    reason: Valid protein-level localization evidence but not Calm3-specific; Calm2 is the paralog with
      direct knockout evidence at this synapse
- term:
    id: GO:0140238
    label: presynaptic endocytosis
  evidence_type: NAS
  original_reference_id: PMID:31628181
  review:
    summary: NAS from PMID:31628181; presynaptic endocytosis at calyx of Held; same provenance issue
      as calyx-of-Held NAS — experiment used Calm2 KO; annotation to Calm3 by protein identity
    action: KEEP_AS_NON_CORE
    reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than direct
      Calm3 experimental evidence
- term:
    id: GO:0140238
    label: presynaptic endocytosis
  evidence_type: IMP
  original_reference_id: PMID:31628181
  review:
    summary: IMP from PMID:31628181; mutant phenotype from Calm2 KO used to infer Calm3 function;
      same provenance concern as calyx-of-Held — experiment used Calm2 KO not Calm3 KO; kept as
      non-core consistent with other presynaptic endocytosis entries
    action: KEEP_AS_NON_CORE
    reason: Experimental basis is Calm2 KO; attributed to Calm3 via protein identity rather than
      direct Calm3 experimental evidence
- term:
    id: GO:0140238
    label: presynaptic endocytosis
  evidence_type: IDA
  original_reference_id: PMID:31628181
  review:
    summary: IDA from SynGO curation; calmodulin's role in presynaptic endocytosis is established but
      not Calm3-specific; consistent with Calm3 brain expression context
    action: KEEP_AS_NON_CORE
    reason: Valid protein-level functional evidence but not Calm3-specific
- term:
    id: GO:0098901
    label: regulation of cardiac muscle cell action potential
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  review:
    summary: ISS manual transfer; cardiac action potential regulation is well-established for calmodulin;
      specialized cardiac context rather than a universal Calm3 role
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function
- term:
    id: GO:1901842
    label: negative regulation of high voltage-gated calcium channel activity
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  review:
    summary: ISS manual transfer; inhibitory regulation of L-type Ca channels by calmodulin; well-established
      calmodulin function; consistent with ISO entry for same term
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0043209
    label: myelin sheath
  evidence_type: IDA
  original_reference_id: PMID:19855925
  review:
    summary: PMID:19855925 demonstrates CaM-MBP complex in myelin sheaths via SAXS/NMR and colocalization;
      the study uses general calmodulin protein (not Calm3-specific) isolated from human brain; localization
      evidence is attributed to P0DP28 (Calm3) via CAFA database assignment; Calm3 is expressed in brain
      where myelin is present so the annotation is plausible but represents specialized context
    action: KEEP_AS_NON_CORE
    reason: IDA evidence is for calmodulin protein in general, not specifically Calm3; specialized neural
      context
- term:
    id: GO:0005509
    label: calcium ion binding
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  review:
    summary: ISS manual transfer; core EF-hand calcium binding; redundant with IBA but confirms this core
      function
    action: ACCEPT
    reason: Core calmodulin function or localization
- term:
    id: GO:0008076
    label: voltage-gated potassium channel complex
  evidence_type: IGI
  original_reference_id: PMID:12223552
  review:
    summary: PMID:12223552 (Wen & Levitan 2002) identifies calmodulin as a constitutive auxiliary subunit
      of KCNQ2/3 potassium channels in mouse brain using yeast two-hybrid and co-immunoprecipitation;
      uses general calmodulin (from mouse brain) not specifically Calm3; IGI evidence is for the calmodulin
      protein interacting with KCNQ genes; valid but Calm3-specificity is not established
    action: KEEP_AS_NON_CORE
    reason: Evidence is for calmodulin protein generally, not Calm3 specifically; specialized neuronal
      context
- term:
    id: GO:0000086
    label: G2/M transition of mitotic cell cycle
  evidence_type: IDA
  original_reference_id: PMID:2469574
  review:
    summary: PMID:2469574 (Rasmussen & Means 1989) uses inducible antisense RNA to reduce calmodulin
      in mouse C127 cells, causing cell cycle arrest at G1 and mitosis; the antisense targets total
      calmodulin (CaM), not specifically Calm3; direct evidence for calmodulin cell cycle requirement;
      core function consistent with centrosome/spindle annotations
    action: KEEP_AS_NON_CORE
    reason: Tissue-specific or specialized function; IDA evidence supports calmodulin requirement in cell
      cycle progression but not core Calm3 molecular function
- term:
    id: GO:0005509
    label: calcium ion binding
  evidence_type: TAS
  original_reference_id: PMID:2469574
  review:
    summary: TAS (traceable author statement) for calcium ion binding from PMID:2469574; core EF-hand
      function; redundant with IBA/ISS entries
    action: ACCEPT
    reason: Core calmodulin function or localization
    supported_by:
    - reference_id: file:mouse/Calm3/Calm3-deep-research-falcon.md
core_functions:
- description: Binds calcium through four EF-hand motifs; primary molecular mechanism
    for calmodulin activity; triggers conformational change enabling target binding
    and transduction of calcium signals.
  molecular_function:
    id: GO:0005509
    label: calcium ion binding
  locations:
  - id: GO:0005829
    label: cytosol
  directly_involved_in:
  - id: GO:0005513
    label: detection of calcium ion
  supported_by:
  - reference_id: UniProtKB:P0DP28
    supporting_text: This protein has four functional calcium-binding sites.
  - reference_id: file:mouse/Calm3/Calm3-deep-research-falcon.md
    supporting_text: Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand
      calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.
- description: Activates CaMKII, CaMKIV, and myosin light-chain kinases in a calcium-dependent
    manner; core downstream effector function of calmodulin.
  molecular_function:
    id: GO:0043539
    label: protein serine/threonine kinase activator activity
  locations:
  - id: GO:0005829
    label: cytosol
  directly_involved_in:
  - id: GO:0019722
    label: calcium-mediated signaling
  supported_by:
  - reference_id: UniProtKB:P0DP28
    supporting_text: Among the enzymes to be stimulated by the calmodulin-calcium complex are a number
      of protein kinases, such as myosin light-chain kinases and calmodulin-dependent protein kinase
      type II (CaMK2), and phosphatases.
  - reference_id: file:mouse/Calm3/Calm3-deep-research-falcon.md
    supporting_text: Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand
      calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.
- description: Activates calcineurin (PP2B) phosphatase for NFAT dephosphorylation
    and downstream gene regulation; core calmodulin signaling function.
  molecular_function:
    id: GO:0072542
    label: protein phosphatase activator activity
  locations:
  - id: GO:0005829
    label: cytosol
  directly_involved_in:
  - id: GO:0097720
    label: calcineurin-mediated signaling
  supported_by:
  - reference_id: UniProtKB:P0DP28
    supporting_text: Among the enzymes to be stimulated by the calmodulin-calcium complex are a number
      of protein kinases, such as myosin light-chain kinases and calmodulin-dependent protein kinase
      type II (CaMK2), and phosphatases.
  - reference_id: file:mouse/Calm3/Calm3-deep-research-falcon.md
    supporting_text: Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand
      calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.
- description: Regulates RyR1, RyR2, L-type Ca2+ channels, and other ion channels;
    bidirectional regulation depending on calcium levels; supported by direct RYR1/RYR2
    interaction evidence.
  molecular_function:
    id: GO:0005246
    label: calcium channel regulator activity
  locations:
  - id: GO:0005829
    label: cytosol
  directly_involved_in:
  - id: GO:0010880
    label: regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum
  supported_by:
  - reference_id: PMID:18650434
    supporting_text: Ca(2+)-S100A1 and Ca(2+)-CaM compete directly for the same binding site on the
      ryanodine receptor.
  - reference_id: UniProtKB:P0DP28
    supporting_text: Interacts with RYR2; regulates RYR2 calcium-release channel activity
  - reference_id: file:mouse/Calm3/Calm3-deep-research-falcon.md
    supporting_text: Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand
      calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.
references:
- id: GO_REF:0000024
  title: Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator
    judgment of sequence similarity
  findings: []
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings: []
- id: GO_REF:0000044
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping,
    accompanied by conservative changes to GO terms applied by UniProt
  findings: []
- id: GO_REF:0000096
  title: Automated transfer of experimentally-verified manual GO annotation data to mouse-rat orthologs
  findings:
  - statement: Source rat calmodulin genes RGD:2257, RGD:2258, RGD:2259 all encode the same protein
      as mouse Calm3; ISO transfers are biochemically valid but carry all rat paralog annotations to
      each mouse Calm locus, producing paralog-proliferation of fine-grained annotations without
      Calm3-specific evidence
- id: GO_REF:0000107
  title: Automatic transfer of experimentally verified manual GO annotation data to orthologs using
    Ensembl Compara
  findings: []
- id: GO_REF:0000117
  title: Electronic Gene Ontology annotations created by ARBA machine learning models
  findings: []
- id: GO_REF:0000119
  title: Automated transfer of experimentally-verified manual GO annotation data to mouse-human orthologs
  findings:
  - statement: Source is human CALM1 (P0DP25); all human CALM1/CALM2/CALM3 proteins are identical
      to mouse Calm3 protein; ISO transfers represent valid ortholog evidence with 100% sequence
      identity; no paralog-specific differences exist at the protein level
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: file:mouse/Calm3/Calm3-deep-research-falcon.md
  title: Falcon deep research summary for mouse Calm3
  findings:
  - statement: Falcon research confirms Calm3 as mouse calmodulin-3, a calmodulin-family EF-hand
      calcium sensor, and highlights the locus-specific Calm3L dendritic mRNA localization literature.
- id: PMID:12223552
  title: Calmodulin is an auxiliary subunit of KCNQ2/3 potassium channels.
  findings:
  - statement: Calmodulin (CaM) identified as constitutive auxiliary subunit of KCNQ2/3 potassium
      channels via yeast two-hybrid and co-immunoprecipitation from mouse brain
    supporting_text: Calmodulin (CaM) was identified as a KCNQ2 and KCNQ3 potassium channel-binding
      protein, using a yeast two-hybrid screen. CaM is tethered constitutively to the channel, in
      the absence or presence of Ca2+, in transfected cells and also coimmunoprecipitates with KCNQ2/3
      from mouse brain.
  - statement: CaM binding to KCNQ2 IQ-like motifs is calcium-independent and required for channel
      activity
    supporting_text: The voltage-dependent activation of the KCNQ2/3 channel also shows no Ca2+
      sensitivity, nor is it affected by overexpression of the Ca2+-insensitive CaM mutant. On the
      other hand, KCNQ2 mutants deficient in CaM binding are unable to generate detectable currents
      when coexpressed with KCNQ3 in CHO cells...The correlation of CaM binding with channel function
      suggests that CaM is an auxiliary subunit of the KCNQ2/3 channel.
  - statement: Evidence uses general calmodulin from mouse brain, not specifically Calm3
    full_text_unavailable: true
- id: PMID:18650434
  title: S100A1 and calmodulin compete for the same binding site on ryanodine receptor.
  findings:
  - statement: Ca2+-calmodulin competes for the same ryanodine receptor binding site as S100A1.
    supporting_text: Ca(2+)-S100A1 and Ca(2+)-CaM compete directly for the same binding site on the
      ryanodine receptor.
- id: PMID:19855925
  title: Structural analysis of the complex between calmodulin and full-length myelin basic protein,
    an intrinsically disordered molecule.
  findings:
  - statement: CaM pulled down as major calcium-dependent binding partner of MBP from human brain
      white matter
    supporting_text: We pulled down MBP from human brain white matter as the major calcium-dependent
      CaM-binding protein.
  - statement: CaM and MBP colocalize in myelin sheaths
    supporting_text: show that CaM and MBP colocalize in myelin sheaths.
  - statement: Study uses general calmodulin protein; does not identify which calmodulin gene product
      is present in myelin
    full_text_unavailable: true
- id: PMID:2469574
  title: Calmodulin is required for cell-cycle progression during G1 and mitosis.
  findings:
  - statement: Antisense-RNA-induced reduction of calmodulin in mouse C127 cells causes cell cycle
      arrest at G1 and mitosis
    supporting_text: Cells carrying the BPV-CaMAS vector transiently produce CaM anti-sense RNA
      resulting in a significant decrease in intracellular CaM concentration...Flow cytometric analysis
      showed that progression through G1 and mitosis was affected by changes in CaM levels.
  - statement: Calmodulin overexpression transiently accelerates proliferation
    supporting_text: Increased CaM caused a transient acceleration of proliferation, while the
      anti-sense RNA induced decrease in CaM caused a transient cell cycle arrest.
  - statement: Evidence targets total calmodulin (all CaM genes), not specifically Calm3
    full_text_unavailable: true
- id: PMID:28765142
  title: A retained intron in the 3'-UTR of Calm3 mRNA mediates its Staufen2- and activity-dependent
    localization to neuronal dendrites.
  findings:
  - statement: Calm3L (long isoform) mRNA is the top Stau2 iCLIP target in E18 mouse brain via
      a retained 3-UTR intron; Calm1 and Calm2 lack Stau2 crosslink clusters in this analysis —
      this is a Calm3-specific regulatory feature
    supporting_text: In 28 (7.9%) of those, binding occurred to a retained intron in their 3'-UTR
      The strongest bound 3'-UTR intron was present in the longest isoform of Calmodulin 3 (Calm3L )
      mRNA Calm3L 3'-UTR contains six Stau2 crosslink clusters, four of which are in this retained
      3'-UTR intron
  - statement: Stau2-mediated dendritic localization of Calm3L mRNA is activity-dependent and
      abolished by synaptic silencing
    supporting_text: NMDA-mediated synaptic activity specifically promoted the dendritic mRNA
      localization of the Calm3L isoform, while inhibition of synaptic activity reduced it
      substantially.
  - statement: Loss of the retained 3-UTR intron impairs dendritic localization; Stau2 knockdown
      increases nuclear retention without affecting total mRNA stability
    supporting_text: The Calm3L mRNA localized to neuronal dendrites, while lack of the 3'-UTR intron
      impaired its dendritic localization. Importantly, Stau2 mediates this dendritic localization
      via the 3'-UTR intron, without affecting its stability.
- id: PMID:31628181
  title: Protein Kinase C and Calmodulin Serve As Calcium Sensors for Calcium-Stimulated Endocytosis
    at Synapses.
  findings:
  - statement: Calmodulin 2 gene (Calm2) knockout mice used for all calmodulin-related genetic
      experiments
    supporting_text: We generated PKC (α or β-isoform) and calmodulin (calmodulin 2 gene) knock-out
      mice of either sex and measured endocytosis with capacitance measurements, pHluorin imaging
      and electron microscopy.
  - statement: Calm2 KO inhibits slow, rapid, and bulk endocytosis at calyx of Held and hippocampal
      synapses
    supporting_text: We found that these knock-outs inhibited slow (∼10-30 s) and rapid (<∼3 s)
      endocytosis at large calyx-type calyces, and inhibited slow endocytosis and bulk endocytosis
      (forming large endosome-like structures) at small conventional hippocampal synapses
  - statement: Rescue by wild-type calmodulin but not calcium-binding-deficient mutant confirms
      calcium-sensor role
    supporting_text: Inhibition of slow endocytosis in PKC or calmodulin 2 knock-out hippocampal
      synapses was rescued by overexpressing wild-type PKC or calmodulin, but not calcium-binding-deficient
      PKC or calmodulin mutant, respectively, suggesting that calcium stimulates endocytosis by binding
      with its calcium sensor PKC and calmodulin.
  - statement: The knockout is Calm2-specific; attribution of IMP/NAS evidence to Calm3 (P0DP28)
      is based on protein identity, not direct Calm3 experimental manipulation
    full_text_unavailable: true
suggested_questions:
- question: Is Calm3 preferentially recruited over Calm1 or Calm2 at brain synapses, or are all
    three calmodulin paralogs functionally interchangeable at this location?
- question: What is the basis for the calyx-of-Held and presynaptic endocytosis IDA annotations
    being attributed to Calm3 (P0DP28) by SynGO when the knockout experiment in PMID:31628181
    specifically used Calm2?
- question: Do Calm1, Calm2, and Calm3 have distinct expression profiles across mouse brain cell
    types that would justify differential annotation of synaptic, cardiac, or other specialized
    terms to specific paralogs?
suggested_experiments:
- description: Calm3-specific knockout at calyx of Held synapses to test whether Calm3 makes a
    distinct contribution to presynaptic endocytosis independent of Calm2
  hypothesis: Calm3, as the most brain-enriched calmodulin paralog, may be specifically required
    at certain synapses even though all three calmodulin proteins are biochemically identical
  experiment_type: Conditional gene knockout and synaptic physiology
- description: Single-cell RNA-seq comparison of Calm1, Calm2, and Calm3 expression across mouse
    brain cell types to determine if any calmodulin paralog is preferentially expressed in specific
    neuronal populations
  hypothesis: Calm3 may show distinct cell-type enrichment that would justify differential assignment
    of neuronal ISO annotations to Calm3 versus Calm1/Calm2
  experiment_type: Single-cell transcriptomics
- description: Generate calmodulin paralog-specific antibodies or endogenous epitope tags to
    determine whether Calm3 protein specifically localizes to synaptic vesicle membrane, presynaptic
    cytosol, or myelin sheath at the protein level
  hypothesis: Calm3-encoded protein may be preferentially present at certain subcellular compartments
    due to local translation or differential mRNA localization
  experiment_type: Endogenous tagging and subcellular proteomics