Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0000422 autophagy of mitochondrion	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation based on phylogenetic inference from orthologs. This annotation accurately reflects the core function of PINK-1 in initiating mitophagy. The PINK-1/PDR-1 pathway is the canonical mitophagy pathway in C. elegans, and multiple studies demonstrate PINK-1's essential role in this process [PMID:25896323, file:worm/pink-1/pink-1-deep-research-falcon.md]. Reason: PINK-1 is a central regulator of mitophagy. Upon mitochondrial depolarization, PINK-1 stabilizes on the outer mitochondrial membrane where it phosphorylates ubiquitin and PDR-1/Parkin to initiate the mitophagic cascade. This is well-established across species and supported by direct experimental evidence in C. elegans. The IBA annotation is phylogenetically sound and consistent with experimental data. Supporting Evidence: PMID:25896323 DCT-1 is a key mediator of mitophagy and longevity assurance under conditions of stress in C. elegans file:worm/pink-1/pink-1-deep-research-falcon.md The PINK-1/PDR-1 (Parkin homolog) pathway mediates mitophagy and mitochondrial quality control in worms
GO:0004674 protein serine/threonine kinase activity	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for the core molecular function of PINK-1 as a serine/threonine kinase. PINK-1 contains a conserved protein kinase domain (residues 137-483) and is classified in the Ser/Thr protein kinase family. The kinase catalyzes phosphorylation of serine residues on ubiquitin (Ser65) and Parkin/PDR-1 (Ser65 in the Ubl domain). Reason: This is the fundamental molecular function of PINK-1. The protein contains a conserved kinase domain with canonical N- and C-lobes and PINK1-specific insert regions. UniProt records the catalytic activity (EC 2.7.11.1) and the active site at position 338. The annotation is appropriately specific and reflects the core enzymatic activity. Supporting Evidence: UniProt:Q09298 Serine/threonine-protein kinase pink-1, mitochondrial
GO:0005739 mitochondrion	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for mitochondrial localization. PINK-1 contains an N-terminal mitochondrial targeting sequence (residues 1-74) and localizes to mitochondria. This localization is described in the deep research file based on PMID:19251702 and other sources. Reason: Mitochondrial localization is central to PINK-1 function. The N-terminal transit peptide directs PINK-1 to mitochondria. Under normal conditions PINK-1 is imported and cleaved; upon mitochondrial damage, full-length PINK-1 accumulates on the outer mitochondrial membrane where it functions. Supporting Evidence: file:worm/pink-1/pink-1-deep-research-falcon.md A rescuing Ppink-1::pink-1::gfp transgene shows broad expression in neurons and other tissues with partial mitochondrial co-localization
GO:0042981 regulation of apoptotic process	IBA GO_REF:0000033	KEEP AS NON CORE	Summary: IBA annotation suggesting PINK-1 involvement in regulation of apoptosis. While mammalian PINK1 has been implicated in apoptosis regulation, direct experimental evidence for this role in C. elegans is limited. The primary role of PINK-1 in worms appears to be in mitophagy and mitochondrial quality control rather than direct apoptosis regulation. Reason: PINK1 involvement in apoptosis regulation is primarily characterized in mammalian systems. While mitochondrial dysfunction (which PINK-1 regulates) can influence apoptotic pathways, direct evidence for PINK-1 regulation of apoptosis in C. elegans is not well established. The annotation may be valid based on phylogenetic inference but represents a secondary rather than core function in worms. Supporting Evidence: GO_REF:0000033 [IBA annotation inferred from phylogenetic trees]
GO:0090141 positive regulation of mitochondrial fission	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for positive regulation of mitochondrial fission. PINK-1 and Parkin are known to impact mitochondrial dynamics including fission/fusion. In C. elegans, pink-1 loss leads to altered mitochondrial morphology as described in the deep research file. Reason: PINK-1/Parkin impacts mitochondrial dynamics as part of the mitophagy quality control process. Damaged mitochondria undergo fission before mitophagic clearance. The IBA annotation reflects conserved roles in mitochondrial dynamics. Supporting Evidence: file:worm/pink-1/pink-1-deep-research-falcon.md PINK1-Parkin impacts fission/fusion components and mitochondrial motility; in worms, pink-1 loss alters cristae and stress responses
GO:0000166 nucleotide binding	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation based on UniProtKB keyword mapping. PINK-1 is a kinase that requires ATP for catalysis. The annotation is correct but overly general - ATP binding (GO:0005524) is a more specific and informative term. Reason: This is a correct but broad annotation. PINK-1 binds ATP as a kinase substrate. The annotation is technically accurate but less informative than GO:0005524 (ATP binding), which is also annotated. Acceptable as a parent term capture. Supporting Evidence: UniProt:Q09298 Nucleotide-binding; Reference proteome; Serine/threonine-protein kinase
GO:0004672 protein kinase activity	IEA GO_REF:0000002	ACCEPT	Summary: IEA annotation from InterPro domain IPR000719 (protein kinase domain). PINK-1 has a well-characterized protein kinase domain. This annotation is correct but less specific than GO:0004674 (protein serine/threonine kinase activity). Reason: Correct annotation based on the presence of the protein kinase domain. While GO:0004674 (protein serine/threonine kinase activity) is more specific and also annotated, this parent term is acceptable as a complementary IEA annotation. Supporting Evidence: UniProt:Q09298 InterPro; IPR000719; Prot_kinase_dom
GO:0004674 protein serine/threonine kinase activity	IEA GO_REF:0000120	ACCEPT	Summary: IEA annotation from combined automated methods including InterPro and EC number. Duplicates the IBA annotation for the same term. PINK-1 is a serine/threonine kinase (EC 2.7.11.1) that phosphorylates ubiquitin Ser65 and Parkin Ser65. Reason: Duplicate of the IBA annotation but via different evidence. The annotation is correct - PINK-1 is a serine/threonine kinase with defined catalytic activity. Having both IBA and IEA evidence provides independent support. Supporting Evidence: UniProt:Q09298 Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.
GO:0005524 ATP binding	IEA GO_REF:0000120	ACCEPT	Summary: IEA annotation for ATP binding. PINK-1 binds ATP as a substrate for its kinase activity. The ATP binding site is located at residues 143-151 and 199, as defined in the UniProt feature annotations. Reason: ATP binding is essential for PINK-1 kinase activity. The annotation is well-supported by the presence of canonical ATP-binding motifs in the kinase domain and explicit binding site annotations in UniProt. This is more specific and informative than the general nucleotide binding annotation. Supporting Evidence: UniProt:Q09298 ATP-binding; Kinase; Magnesium; Metal-binding; Mitochondrion
GO:0005739 mitochondrion	IEA GO_REF:0000120	ACCEPT	Summary: IEA annotation for mitochondrial localization. Duplicates the IBA annotation. PINK-1 contains an N-terminal mitochondrial transit peptide (residues 1-74) that targets it to mitochondria. Reason: Correct annotation supported by the presence of a mitochondrial targeting sequence and UniProt subcellular location annotation. The IEA provides computational support for the IBA and IDA annotations for this localization. Supporting Evidence: UniProt:Q09298 SUBCELLULAR LOCATION: Mitochondrion
GO:0006950 response to stress	IEA GO_REF:0000117	ACCEPT	Summary: IEA annotation from ARBA machine learning models. PINK-1 is involved in stress responses, particularly mitochondrial stress and oxidative stress. However, this term is very broad and more specific annotations exist (e.g., GO:0034599 cellular response to oxidative stress). Reason: PINK-1 is indeed involved in stress responses, functioning as a mitochondrial stress sensor. While the term is broad, it is not incorrect. More specific stress-related annotations (oxidative stress, ER stress) provide additional detail. The broad term captures the general stress-responsive role of PINK-1. Supporting Evidence: PMID:19251702 increased vulnerability to oxidative and endoplasmic reticulum stress
GO:0016301 kinase activity	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation based on keyword mapping. Very broad parent term of the more specific protein serine/threonine kinase activity annotation. PINK-1 is a kinase. Reason: This is a correct but very general annotation. It is a parent term of GO:0004674 (protein serine/threonine kinase activity) which is also annotated. Acceptable as broad IEA capture but provides less information than the specific kinase type. Supporting Evidence: UniProt:Q09298 Kinase; Magnesium; Metal-binding; Mitochondrion
GO:0016740 transferase activity	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation based on keyword mapping. Very broad parent term - kinases are transferases that transfer phosphate groups. This is the highest-level function class for PINK-1. Reason: Correct but extremely general annotation. Kinases are a subclass of transferases (they transfer phosphate groups from ATP to substrates). The annotation is technically accurate but provides minimal functional insight. Acceptable as broad IEA capture. Supporting Evidence: UniProt:Q09298 Transferase; Transit peptide
GO:0046872 metal ion binding	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation for metal ion binding. PINK-1 requires Mg2+ as a cofactor for kinase activity, which is typical for protein kinases. Reason: Protein kinases require divalent metal ions (typically Mg2+) for catalytic activity. UniProt records Mg2+ as a cofactor for PINK-1. This is a correct annotation reflecting the metal ion requirement for phosphotransfer reactions. Supporting Evidence: UniProt:Q09298 Name=Mg(2+); Xref=ChEBI:CHEBI:18420
GO:0106310 protein serine kinase activity	IEA GO_REF:0000116	ACCEPT	Summary: IEA annotation from Rhea reaction mapping. PINK-1 phosphorylates serine residues, specifically Ser65 of ubiquitin and Ser65 of Parkin. The Rhea database links the catalytic reaction (RHEA:17989) to this GO term. Reason: The best-characterized substrates of PINK1 are phosphorylated on serine residues (ubiquitin Ser65, Parkin Ser65). This annotation is appropriately specific and supported by the known substrate specificity. Complements the broader serine/threonine kinase activity annotation. Supporting Evidence: file:worm/pink-1/pink-1-deep-research-falcon.md The best-established substrates are ubiquitin (Ser65) and Parkin's Ubl domain (Ser65)
GO:0000423 mitophagy	IMP PMID:26469957 A bacterial metabolite induces glutathione-tractable proteos...	ACCEPT	Summary: IMP annotation based on mutant phenotype analysis in C. elegans. The study showed that a bacterial metabolite induces PINK-1-dependent autophagy, and pink-1 loss eliminates the autophagic response to mitochondrial stress. Reason: Direct experimental evidence in C. elegans demonstrating PINK-1's role in mitophagy. The study showed that metabolite-induced autophagy was PINK-1 dependent, and pink-1 loss-of-function epistatically regulated the effects of the metabolite on proteostasis and mitochondrial morphology. Supporting Evidence: file:worm/pink-1/pink-1-deep-research-falcon.md The PINK-1/PDR-1 (Parkin homolog) pathway mediates mitophagy and mitochondrial quality control in worms PMID:26469957 A bacterial metabolite induces glutathione-tractable proteostatic damage, proteasomal disturbances, and PINK1-dependent autophagy in C.
GO:0000423 mitophagy	IMP PMID:25896323 Coordination of mitophagy and mitochondrial biogenesis durin...	ACCEPT	Summary: IMP annotation from a key Nature paper demonstrating PINK-1 role in mitophagy during aging in C. elegans. The study established that mitophagy coordinates with mitochondrial biogenesis and that PINK-1/PDR-1 pathway is essential for this process. Reason: High-quality evidence from a Nature publication establishing PINK-1's central role in mitophagy in C. elegans. The study showed that impairment of mitophagy compromises stress resistance and that the PINK-1/PDR-1 pathway is critical for mitochondrial quality control during aging. This is a core function. Supporting Evidence: PMID:25896323 Impairment of mitophagy compromises stress resistance and triggers mitochondrial retrograde signalling UniProt:Q09298 Plays a role in mitophagy (PubMed:25896323)
GO:0031398 positive regulation of protein ubiquitination	IMP PMID:25896323 Coordination of mitophagy and mitochondrial biogenesis durin...	ACCEPT	Summary: IMP annotation for PINK-1's role in promoting protein ubiquitination. PINK-1 phosphorylates ubiquitin and Parkin to activate the ubiquitin ligase activity of Parkin/PDR-1, leading to ubiquitination of outer mitochondrial membrane proteins. Reason: This accurately reflects PINK-1's mechanism of action. Activated PINK-1 phosphorylates ubiquitin at Ser65 and Parkin at Ser65, which promotes Parkin's E3 ligase activity and creates a feed-forward loop of ubiquitination. This leads to ubiquitin chain deposition on mitochondrial proteins and recruitment of autophagy machinery. Supporting Evidence: file:worm/pink-1/pink-1-deep-research-falcon.md Activated PINK1 phosphorylates ubiquitin at Ser65 and also phosphorylates Parkin (PRKN) on Ser65 in its Ubl domain, promoting Parkin activation PMID:25896323 Coordination of mitophagy and mitochondrial biogenesis during ageing in C.
GO:0034976 response to endoplasmic reticulum stress	IGI PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	KEEP AS NON CORE	Summary: IGI annotation based on genetic interaction with lrk-1. The study showed that lrk-1 mutants are hypersensitive to ER stress (tunicamycin), and this was reduced in a pink-1 mutant background, demonstrating antagonistic interaction. Reason: The annotation is based on genetic interaction showing that pink-1 mutation suppresses the ER stress sensitivity of lrk-1 mutants. This indicates PINK-1 is involved in ER stress response, but the mechanism is indirect - through antagonistic interaction with LRK-1 rather than direct ER stress sensing. This is a secondary function related to the stress response network involving PINK-1 and LRK-1. Supporting Evidence: PMID:19251702 the hypersensitivity of lrk-1 mutant animals to the endoplasmic reticulum stressor tunicamycin was reduced in a pink-1 mutant background
GO:0007005 mitochondrion organization	IMP PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	ACCEPT	Summary: IMP annotation based on mutant phenotype. pink-1 mutants show reduced mitochondrial cristae length in body-wall muscle (approximately 12% reduction) and neurons (>30% reduction), demonstrating PINK-1's role in mitochondrial organization/morphology. Reason: Direct experimental evidence in C. elegans showing that pink-1 loss affects mitochondrial ultrastructure. The reduced cristae length indicates PINK-1 is required for proper mitochondrial organization. This is consistent with PINK-1's role in mitochondrial quality control. Supporting Evidence: PMID:19251702 a mutation in the Caenorhabditits elegans homologue of the PTEN-induced kinase pink-1 gene resulted in reduced mitochondrial cristae length
GO:0007411 axon guidance	IMP PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	KEEP AS NON CORE	Summary: IMP annotation based on mutant phenotype. pink-1 mutants display defects in axonal outgrowth of canal-associated neurons (CAN neurons). These defects are suppressed by lrk-1 loss, indicating antagonistic function. Reason: Direct experimental evidence shows pink-1 mutants have axon guidance defects. However, this appears to be a secondary consequence of mitochondrial dysfunction rather than a direct role in axon guidance signaling. The phenotype is suppressed by lrk-1 loss, suggesting it reflects the stress response network. Not a core function of PINK-1. Supporting Evidence: PMID:19251702 the mutants also displayed defects in axonal outgrowth of a pair of canal-associated neurons
GO:0034599 cellular response to oxidative stress	IMP PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	ACCEPT	Summary: IMP annotation based on mutant phenotype. pink-1 mutants show increased sensitivity to paraquat, a known inducer of oxidative stress. This demonstrates PINK-1's role in protection against oxidative stress. Reason: Direct experimental evidence showing pink-1 mutants are hypersensitive to oxidative stress (paraquat). This is consistent with PINK-1's role in mitochondrial quality control - damaged mitochondria are major sources of ROS, and failure to clear them leads to increased oxidative damage. The annotation reflects a core protective function. Supporting Evidence: PMID:19251702 reduced mitochondrial cristae length and increased paraquat sensitivity of the nematode
GO:0048846 axon extension involved in axon guidance	IMP PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	KEEP AS NON CORE	Summary: IMP annotation for more specific aspect of axon guidance. pink-1 mutants show defects in axonal extension of CAN neurons. Reason: This is a more specific child term of axon guidance (GO:0007411). The experimental evidence is the same - pink-1 mutants have CAN neuron axonal outgrowth defects. As with the parent term, this likely represents a secondary consequence of mitochondrial dysfunction rather than a direct axon extension function. Supporting Evidence: PMID:19251702 the mutants also displayed defects in axonal outgrowth of a pair of canal-associated neurons
GO:0048846 axon extension involved in axon guidance	IGI PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	KEEP AS NON CORE	Summary: IGI annotation based on genetic interaction with lrk-1. Loss of lrk-1 suppresses the axon extension defects of pink-1 mutants, demonstrating antagonistic interaction. Reason: Duplicate term with different evidence code. The genetic interaction evidence supports the antagonistic relationship between PINK-1 and LRK-1 in neuronal development. This reflects the stress response/neuronal function network rather than a core function of PINK-1. Supporting Evidence: PMID:19251702 in the absence of lrk-1, the C. elegans homologue of human LRRK2, all phenotypic aspects of pink-1 loss-of-function mutants were suppressed
GO:0005737 cytoplasm	IDA PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	ACCEPT	Summary: IDA annotation for cytoplasmic localization based on GFP-tagged PINK-1 imaging. The study showed PINK-1::GFP localizes to both mitochondria and cytoplasm. Reason: Direct experimental evidence from imaging of PINK-1::GFP transgene. PINK-1 is found in both mitochondria and cytoplasm. Under normal conditions, PINK-1 is imported into mitochondria, cleaved, and retrotranslocated to cytoplasm for degradation. The cytoplasmic pool reflects this processing pathway. Supporting Evidence: file:worm/pink-1/pink-1-deep-research-falcon.md A rescuing Ppink-1::pink-1::gfp transgene shows broad expression in neurons and other tissues with partial mitochondrial co-localization PMID:19251702 Epub 2009 Feb 27. Caenorhabditits elegans LRK-1 and PINK-1 act antagonistically in stress response and neurite outgrowth.
GO:0005739 mitochondrion	IDA PMID:19251702 Caenorhabditits elegans LRK-1 and PINK-1 act antagonisticall...	ACCEPT	Summary: IDA annotation for mitochondrial localization based on direct imaging of PINK-1::GFP in C. elegans. Shows co-localization with mitochondrial markers. Reason: High-quality direct experimental evidence. PINK-1::GFP shows mitochondrial co-localization, confirming that PINK-1 targets to mitochondria as expected from its N-terminal mitochondrial targeting sequence. This is the primary site of PINK-1 function in mitophagy initiation. Supporting Evidence: file:worm/pink-1/pink-1-deep-research-falcon.md A rescuing Ppink-1::pink-1::gfp transgene shows broad expression in neurons and other tissues with partial mitochondrial co-localization PMID:19251702 Epub 2009 Feb 27. Caenorhabditits elegans LRK-1 and PINK-1 act antagonistically in stress response and neurite outgrowth.

Core Functions

PINK-1 is a serine/threonine kinase that phosphorylates ubiquitin (Ser65) and Parkin/PDR-1 (Ser65) to activate the mitophagic cascade at the outer mitochondrial membrane. Loss of pink-1 eliminates stress-induced autophagic responses and prevents clearance of damaged mitochondria.

Molecular Function:

protein serine/threonine kinase activity

Directly Involved In:

mitophagy

Cellular Locations:

mitochondrion

Supporting Evidence:

PMID:25896323
Impairment of mitophagy compromises stress resistance and triggers mitochondrial retrograde signalling
file:worm/pink-1/pink-1-deep-research-falcon.md
The PINK-1/PDR-1 (Parkin homolog) pathway mediates mitophagy and mitochondrial quality control in worms

PINK-1 phosphorylates ubiquitin and Parkin to activate Parkin's E3 ligase activity, promoting ubiquitination of outer mitochondrial membrane proteins as part of the mitophagy initiation cascade.

Molecular Function:

protein serine/threonine kinase activity

Directly Involved In:

positive regulation of protein ubiquitination

Cellular Locations:

mitochondrion

Supporting Evidence:

file:worm/pink-1/pink-1-deep-research-falcon.md
Activated PINK1 phosphorylates ubiquitin at Ser65 and also phosphorylates Parkin (PRKN) on Ser65 in its Ubl domain, promoting Parkin activation

pink-1 mutants are hypersensitive to paraquat-induced oxidative stress. PINK-1-dependent clearance of damaged mitochondria (which produce ROS) is protective against oxidative damage.

Molecular Function:

protein serine/threonine kinase activity

Directly Involved In:

cellular response to oxidative stress

Cellular Locations:

mitochondrion

Supporting Evidence:

PMID:19251702
reduced mitochondrial cristae length and increased paraquat sensitivity of the nematode

References

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

GO_REF:0000033

Annotation inferences using phylogenetic trees

PAINT/IBA annotations provide phylogenetically consistent annotations based on well-characterized orthologs

GO_REF:0000043

Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

GO_REF:0000116

Automatic Gene Ontology annotation based on Rhea mapping

GO_REF:0000117

Electronic Gene Ontology annotations created by ARBA machine learning models

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:19251702

Caenorhabditits elegans LRK-1 and PINK-1 act antagonistically in stress response and neurite outgrowth.

pink-1 mutants have reduced mitochondrial cristae length and increased paraquat sensitivity

"a mutation in the Caenorhabditits elegans homologue of the PTEN-induced kinase pink-1 gene resulted in reduced mitochondrial cristae length and increased paraquat sensitivity of the nematode"
pink-1 mutants display axon guidance defects in CAN neurons

"the mutants also displayed defects in axonal outgrowth of a pair of canal-associated neurons"
lrk-1 loss suppresses all pink-1 phenotypes

"in the absence of lrk-1, the C. elegans homologue of human LRRK2, all phenotypic aspects of pink-1 loss-of-function mutants were suppressed"
pink-1 loss reduces lrk-1 ER stress sensitivity (tunicamycin)

"the hypersensitivity of lrk-1 mutant animals to the endoplasmic reticulum stressor tunicamycin was reduced in a pink-1 mutant background"

PMID:25896323

Coordination of mitophagy and mitochondrial biogenesis during ageing in C. elegans.

PINK-1/PDR-1 pathway is essential for mitophagy in C. elegans

"DCT-1 is a key mediator of mitophagy and longevity assurance under conditions of stress in C. elegans"
Mitophagy coordinates with mitochondrial biogenesis during aging

"mitophagy, a selective type of autophagy targeting mitochondria for degradation, interfaces with mitochondrial biogenesis to regulate mitochondrial content and longevity"
Impairment of mitophagy compromises stress resistance

"Impairment of mitophagy compromises stress resistance and triggers mitochondrial retrograde signalling"

PMID:26469957

A bacterial metabolite induces glutathione-tractable proteostatic damage, proteasomal disturbances, and PINK1-dependent autophagy in C. elegans.

Metabolite-induced autophagy is PINK-1 dependent

"the induced autophagy observed in metabolite-treated animals is PINK-1 dependent"
PINK-1 is required for stress-induced autophagic response

"animals with reduced pink-1 no longer have increased mCherry::LGG-1 accumulation in the presence of the metabolite"

file:worm/pink-1/pink-1-deep-research-falcon.md

Deep research on C. elegans pink-1

PINK-1 is a mitochondrial stress-activated serine/threonine kinase

"PINK-1 is a mitochondrial stress-activated serine/threonine kinase whose substrates include ubiquitin (Ser65) and Parkin/PRKN (Ser65)"
PINK-1 localizes to mitochondria with a cytoplasmic pool

"A rescuing Ppink-1::pink-1::gfp transgene shows broad expression in neurons and other tissues with partial mitochondrial co-localization"
pink-1 loss reduces mitochondrial cristae length

"pink-1 loss reduces mitochondrial cristae length (approximately 12% reduction in body-wall muscle; >30% in neurons)"

Suggested Experiments

Experiment: In vitro kinase assays with purified C. elegans PINK-1 to identify substrates

Hypothesis: C. elegans PINK-1 phosphorylates ubiquitin and PDR-1 at conserved Ser65 positions

Experiment: Phosphoproteomics in pink-1 mutants to identify PINK-1-dependent phosphorylation events

Hypothesis: PINK-1 has additional substrates beyond ubiquitin and Parkin

Experiment: Tissue-specific rescue experiments to determine cell-autonomous vs non-autonomous functions

Hypothesis: PINK-1 function in neurons is cell-autonomous for mitophagy and stress response

📚 Additional Documentation

Deep Research Bioreason

(pink-1-deep-research-bioreason.md)

BioReason Chat Export

Exported on March 22, 2026 at 01:14 AM

Organism: Caenorhabditis elegans

Sequence:

MSMKRFGKAAYRIANELVAKGGRLPIFQRFLPRIFPATYNLGVHVVLKKAPFPRQNALRIARLVTRHGRVFRPFSSVIIERHRFQNQNDWRRKFQPIRKELPRNVDLVERIRQIFGNSLRYNEDLKSTEWPNRIDSYEFGEFLGQGCNAAVYSARLANSDAESSGNTHYGAGFNEVTNILAEIPPVSKVAQKKFPLAIKLMFNFEHDRDGDAHLLKSMGNELAPYPNAAKLLNGQMGTFRPLPAKHPNVVRIQTAFIDSLKVLPDAIERYPDALHTARWYESIASEPKTMYVVMRRYRQTLHEYVWTRHRNYWTGRVIIAQLLEACTYLHKHKVAQRDMKSDNILLEYDFDDEIPQLVVADFGCALACDNWQVDYESDEVSLGGNAKTKAPEIATAVPGKNVKVNFEMADTWAAGGLSYEVLTRSNPFYKLLDTATYQESELPALPSRVNFVARDVIFDLLKRDPNERVKPNIAANALNLSLFRMGEDVKQMMEKCGISQMTTLLAGSSKVLSQKINSRLDKVMNLITAETIMANLAPHLISRAERQLRATFLSRMNREDIWRSLQYFFPAGVQLDTPATSSDCLETISSLMSSFSNDSENYEKQQKPAKNGYNNVPLLLRNVIRTDADGINGIVHRVRSK

Thinking Trace

I begin by dissecting the InterPro architecture and its order along the polypeptide. The N-terminal half transitions into a central kinase core defined by IPR011009 (Protein kinase-like domain superfamily, residues 128–471) that houses IPR000719 (Protein kinase domain, residues 137–483). Within this catalytic engine sits IPR040110 (PINK1, protein kinase domain, residues 143–483), a hallmark that specifies a PINK1-like atypical Ser/Thr kinase fold. The entire catalytic region and its flanking sequences are embedded within IPR051511 (Mitochondrial Quality Control and Scaffold Kinases family, residues 47–570), which ties this kinase to mitochondrial surveillance pathways. The ordered layout—an N-terminal region feeding into a well-formed protein kinase-like core with PINK1-specific determinants—causes ATP-dependent phosphotransfer chemistry and supports ATP binding and protein kinase activity. This architecture dictates GO:0004672 protein kinase activity and, mechanistically, entails ATP binding and serine/threonine phosphorylation.

From this catalytic foundation, I infer molecular function first and foremost as a protein kinase (GO:0004672), because the canonical domain ensemble and PINK1-class signature enforce ATP-dependent phosphotransfer. The PINK1-specific module often operates as a regulatory scaffold as well—stabilizing assemblies at damaged mitochondria—so the same architecture both drives phosphorylation and organizes signaling hubs.

This kinase-centric design directly links to mitochondrial quality control biology. Membership in the mitochondrial quality control/scaffold kinase family (IPR051511) causally connects the enzyme to surveillance pathways that determine whether injured mitochondria are preserved, repaired, or removed. Such pathways constitute mitochondrion organization and homeostasis; thus, the kinase’s activity propagates into broader cellular programs of organelle maintenance. Therefore, the most parsimonious biological process annotation is mitochondrion organization (GO:0007005), capturing the assembly and remodeling of mitochondrial networks that underpin cellular energy balance and stress resistance.

The cellular component and subcellular location are resolved by the soluble kinase architecture without predicted transmembrane segments, which aligns with a soluble, matrix-facing enzyme that associates peripherally with mitochondrial membranes and protein complexes. The experimentally consistent placement is the mitochondrial compartment, which I formalize as GO:0005737 mitochondrion, matching a matrix- and inner-membrane-proximal kinase that senses and responds to mitochondrial status.

Mechanistically, I propose the following model. The N-to-C arrangement culminating in a PINK1-like kinase core enables ATP-dependent phosphorylation that toggles assembly states of mitochondrial surveillance complexes. The kinase likely phosphorylates matrix or membrane-associated targets to coordinate mitophagy initiation and repair pathways, with scaffold-like behavior positioning substrates and adaptors. This activity integrates into mitochondrial quality control circuits, where phosphorylation gates the assembly of ubiquitination and autophagy machinery. In this framework, probable interaction partners include mitochondrial dynamics factors and mitophagy initiators that reside at or near the organelle’s inner membrane and matrix interface, forming transient hubs that decide between repair and turnover.

Functional Summary

A soluble mitochondrial kinase in Caenorhabditis elegans that uses an atypical protein kinase core to bind ATP and phosphorylate targets central to organelle surveillance. By assembling and regulating signaling hubs at the mitochondrial interface, it coordinates quality control pathways that balance repair with selective removal of damaged organelles. Its scaffold-like behavior positions substrates and adaptors within the mitochondrial compartment, coupling phosphorylation to broader programs of organelle organization and homeostasis.

UniProt Summary

Probable kinase that may be involved in mitochondrial quality control.

InterPro Domains

Mitochondrial Quality Control and Scaffold Kinases (IPR051511, family) — residues 47-570
Protein kinase-like domain superfamily (IPR011009, homologous_superfamily) — residues 128-471
Protein kinase domain (IPR000719, domain) — residues 137-483
PINK1, protein kinase domain (IPR040110, domain) — residues 143-483

GO Terms

Molecular Function: molecular_function (GO:0003674), catalytic activity (GO:0003824), transferase activity (GO:0016740), catalytic activity, acting on a protein (GO:0140096), GO:0004674 protein kinase activity (GO:0004672), transferase activity, transferring phosphorus-containing groups (GO:0016772), phosphotransferase activity, alcohol group as acceptor (GO:0016773), protein serine/threonine kinase activity (GO:0004674), kinase activity (GO:0016301)

Biological Process: biological_process (GO:0008150), metabolic process (GO:0008152), locomotion (GO:0040011), positive regulation of biological process (GO:0048518), regulation of biological process (GO:0050789), growth (GO:0040007), multicellular organismal process (GO:0032501), biological regulation (GO:0065007), response to stimulus (GO:0050896), developmental process (GO:0032502), cellular process (GO:0009987), response to external stimulus (GO:0009605), developmental growth (GO:0048589), cellular developmental process (GO:0048869), anatomical structure development (GO:0048856), multicellular organism development (GO:0007275), anatomical structure morphogenesis (GO:0009653), response to chemical (GO:0042221), taxis (GO:0042330), regulation of metabolic process (GO:0019222), cellular component organization or biogenesis (GO:0071840), catabolic process (GO:0009056), cellular metabolic process (GO:0044237), cell growth (GO:0016049), positive regulation of metabolic process (GO:0009893), cellular response to stimulus (GO:0051716), response to stress (GO:0006950), process utilizing autophagic mechanism (GO:0061919), cellular component morphogenesis (GO:0032989), positive regulation of macromolecule metabolic process (GO:0010604), response to oxidative stress (GO:0006979), cell development (GO:0048468), developmental growth involved in morphogenesis (GO:0060560), cell differentiation (GO:0030154), cellular catabolic process (GO:0044248), system development (GO:0048731), regulation of macromolecule metabolic process (GO:0060255), autophagy (GO:0006914), cell morphogenesis (GO:0000902), developmental cell growth (GO:0048588), cellular response to chemical stimulus (GO:0070887), cellular response to stress (GO:0033554), regulation of nitrogen compound metabolic process (GO:0051171), cellular component organization (GO:0016043), regulation of primary metabolic process (GO:0080090), chemotaxis (GO:0006935), positive regulation of nitrogen compound metabolic process (GO:0051173), cellular response to oxidative stress (GO:0034599), cell projection organization (GO:0030030), regulation of protein metabolic process (GO:0051246), cellular response to chemical stress (GO:0062197), neuron projection guidance (GO:0097485), cell part morphogenesis (GO:0032990), autophagy of mitochondrion (GO:0000422), neuron development (GO:0048666), response to endoplasmic reticulum stress (GO:0034976), neurogenesis (GO:0022008), cell morphogenesis involved in differentiation (GO:0000904), nervous system development (GO:0007399), positive regulation of protein metabolic process (GO:0051247), organelle organization (GO:0006996), cell projection morphogenesis (GO:0048858), neuron projection extension (GO:1990138), cellular component disassembly (GO:0022411), neuron differentiation (GO:0030182), cell morphogenesis involved in neuron differentiation (GO:0048667), mitochondrion organization (GO:0007005), regulation of protein modification process (GO:0031399), plasma membrane bounded cell projection morphogenesis (GO:0120039), plasma membrane bounded cell projection organization (GO:0120036), neuron projection extension involved in neuron projection guidance (GO:1902284), organelle disassembly (GO:1903008), axon guidance (GO:0007411), neuron projection development (GO:0031175), generation of neurons (GO:0048699), axon extension (GO:0048675), positive regulation of protein modification process (GO:0031401), neuron projection morphogenesis (GO:0048812), regulation of protein modification by small protein conjugation or removal (GO:1903320), mitochondrion disassembly (GO:0061726), axon development (GO:0061564), positive regulation of protein modification by small protein conjugation or removal (GO:1903322), axonogenesis (GO:0007409), axon extension involved in axon guidance (GO:0048846), regulation of protein ubiquitination (GO:0031396), positive regulation of protein ubiquitination (GO:0031398)

Cellular Component: cellular_component (GO:0005575), cellular anatomical entity (GO:0110165), intracellular anatomical structure (GO:0005622), organelle (GO:0043226), mitochondrion (GO:0005737), intracellular organelle (GO:0043229), mitochondrion (GO:0005739), membrane-bounded organelle (GO:0043227), intracellular membrane-bounded organelle (GO:0043231)

Generated by BioReason

Deep Research Bioreason Rl

(pink-1-deep-research-bioreason-rl.md)

BioReason Chat Export

Exported on March 22, 2026 at 01:14 AM

Organism: Caenorhabditis elegans

Sequence:

MSMKRFGKAAYRIANELVAKGGRLPIFQRFLPRIFPATYNLGVHVVLKKAPFPRQNALRIARLVTRHGRVFRPFSSVIIERHRFQNQNDWRRKFQPIRKELPRNVDLVERIRQIFGNSLRYNEDLKSTEWPNRIDSYEFGEFLGQGCNAAVYSARLANSDAESSGNTHYGAGFNEVTNILAEIPPVSKVAQKKFPLAIKLMFNFEHDRDGDAHLLKSMGNELAPYPNAAKLLNGQMGTFRPLPAKHPNVVRIQTAFIDSLKVLPDAIERYPDALHTARWYESIASEPKTMYVVMRRYRQTLHEYVWTRHRNYWTGRVIIAQLLEACTYLHKHKVAQRDMKSDNILLEYDFDDEIPQLVVADFGCALACDNWQVDYESDEVSLGGNAKTKAPEIATAVPGKNVKVNFEMADTWAAGGLSYEVLTRSNPFYKLLDTATYQESELPALPSRVNFVARDVIFDLLKRDPNERVKPNIAANALNLSLFRMGEDVKQMMEKCGISQMTTLLAGSSKVLSQKINSRLDKVMNLITAETIMANLAPHLISRAERQLRATFLSRMNREDIWRSLQYFFPAGVQLDTPATSSDCLETISSLMSSFSNDSENYEKQQKPAKNGYNNVPLLLRNVIRTDADGINGIVHRVRSK

Thinking Trace

Functional Summary

UniProt Summary

Probable kinase that may be involved in mitochondrial quality control.

InterPro Domains

Mitochondrial Quality Control and Scaffold Kinases (IPR051511, family) — residues 47-570
Protein kinase-like domain superfamily (IPR011009, homologous_superfamily) — residues 128-471
Protein kinase domain (IPR000719, domain) — residues 137-483
PINK1, protein kinase domain (IPR040110, domain) — residues 143-483

GO Terms

Generated by BioReason

Deep Research Falcon

(pink-1-deep-research-falcon.md)

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EC=2.7.11.1; AltName: Full=PTEN-induced kinase 1 homolog; Flags: Precursor;'
gene_info: Name=pink-1; ORFNames=EEED8.9;
organism_full: Caenorhabditis elegans.
protein_family: Belongs to the protein kinase superfamily. Ser/Thr protein
protein_domains: Kinase-like_dom_sf. (IPR011009); MitoQC_Scaffold_Kinases. (IPR051511);
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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: Q09298
Protein Description: RecName: Full=Serine/threonine-protein kinase pink-1, mitochondrial; EC=2.7.11.1; AltName: Full=PTEN-induced kinase 1 homolog; Flags: Precursor;
Gene Information: Name=pink-1; ORFNames=EEED8.9;
Organism (full): Caenorhabditis elegans.
Protein Family: Belongs to the protein kinase superfamily. Ser/Thr protein
Key Domains: Kinase-like_dom_sf. (IPR011009); MitoQC_Scaffold_Kinases. (IPR051511); PINK1_STKc. (IPR040110); Prot_kinase_dom. (IPR000719); Pkinase (PF00069)

MANDATORY VERIFICATION STEPS:

Check if the gene symbol "pink-1" matches the protein description above
Verify the organism is correct: Caenorhabditis elegans.
Check if protein family/domains align with what you find in literature
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 'pink-1' 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 pink-1 (gene ID: pink-1, UniProt: Q09298) in worm.

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: Q09298
Protein Description: RecName: Full=Serine/threonine-protein kinase pink-1, mitochondrial; EC=2.7.11.1; AltName: Full=PTEN-induced kinase 1 homolog; Flags: Precursor;
Gene Information: Name=pink-1; ORFNames=EEED8.9;
Organism (full): Caenorhabditis elegans.
Protein Family: Belongs to the protein kinase superfamily. Ser/Thr protein
Key Domains: Kinase-like_dom_sf. (IPR011009); MitoQC_Scaffold_Kinases. (IPR051511); PINK1_STKc. (IPR040110); Prot_kinase_dom. (IPR000719); Pkinase (PF00069)

MANDATORY VERIFICATION STEPS:

Check if the gene symbol "pink-1" matches the protein description above
Verify the organism is correct: Caenorhabditis elegans.
Check if protein family/domains align with what you find in literature
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:

Research Target:

Please provide a comprehensive research report on the gene pink-1 (gene ID: pink-1, UniProt: Q09298) in worm.

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.

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.

Research plan and verification
We verified the target identity and context before research. The gene symbol pink-1 in Caenorhabditis elegans encodes a PTEN-induced serine/threonine protein kinase with an N-terminal mitochondrial targeting sequence/transmembrane region and a cytosol-facing catalytic domain, localizing to mitochondria and cytoplasm; this is consistent with UniProt Q09298 and the protein kinase superfamily/domain annotations (Prot_kinase_dom, Pkinase) (Sämann et al., Journal of Biological Chemistry, published June 2009, https://doi.org/10.1074/jbc.m808255200; Onishi et al., The EMBO Journal, published January 2021, https://doi.org/10.15252/embj.2020104705) (samann2009caenorhabdititseleganslrk1 pages 2-3, onishi2021molecularmechanismsand pages 7-9).

Comprehensive research report: C. elegans pink-1 (UniProt Q09298)
1) Key concepts and definitions with current understanding
- Identity and domains: C. elegans pink-1 encodes a serine/threonine kinase homologous to human PINK1. It contains an N-terminal mitochondrial targeting sequence (MTS) and a transmembrane segment that anchor PINK-1 to the outer mitochondrial membrane (OMM), with a cytosolic catalytic kinase domain featuring canonical N- and C-lobes and PINK1-specific insert regions; a conserved C-terminal region supports activation and substrate recognition (JBC 2009; EMBO J 2021) (samann2009caenorhabdititseleganslrk1 pages 2-3, onishi2021molecularmechanismsand pages 7-9).
- Localization and processing: Under normal mitochondrial membrane potential, PINK1 is imported, cleaved by PARL in the inner membrane, retrotranslocated to the cytosol, and degraded via the N-end rule pathway. Upon mitochondrial depolarization/damage, full-length PINK1 is stabilized on the OMM, accumulates, dimerizes, and autophosphorylates to become active (Biophysical Reviews 2021; EMBO J 2021) (markaki2021mitophagymechanismsin pages 1-2, onishi2021molecularmechanismsand pages 7-9).
- Biochemical function: Activated PINK1 phosphorylates ubiquitin at Ser65 and also phosphorylates Parkin (PRKN) on Ser65 in its Ubl domain, promoting Parkin activation. Phospho-ubiquitin amplifies Parkin recruitment in a feed-forward loop that labels damaged mitochondria with ubiquitin chains, recruiting autophagy receptors and driving mitophagy. Deubiquitinases counterbalance this cascade (Biophysical Reviews 2021; EMBO J 2021; Autophagy 2022) (https://doi.org/10.1007/s12551-021-00894-7; https://doi.org/10.15252/embj.2020104705; https://doi.org/10.1080/15548627.2021.1975914) (markaki2021mitophagymechanismsin pages 1-2, onishi2021molecularmechanismsand pages 7-9, zhang2022themultifacetedregulation pages 17-18).
- Pathway role in C. elegans: The PINK-1/PDR-1 (Parkin homolog) pathway mediates mitophagy and mitochondrial quality control in worms, with additional cooperation from the mitophagy receptor DCT-1/BNIP3 depending on context (Antioxidants 2024) (https://doi.org/10.3390/antiox13111343) (ganguly2024mitochondrialqualitycontrol pages 14-15).

2) Recent developments and latest research (prioritize 2023–2024)
- Chemical activation of PINK1-dependent mitophagy in vivo: Spautin-1, despite being a macroautophagy inhibitor, was shown in 2024 to promote PINK1–PRKN-dependent mitophagy by binding TOMM20/TOMM70, preventing PINK1 import/cleavage and stabilizing full-length PINK1 on the OMM. In C. elegans, spautin-1 induced neuronal mitophagy and improved associative learning in an Alzheimer’s-like model; these benefits were abolished by neuronal pink-1/pdr-1 knockdown, demonstrating pink-1 dependence in vivo (Autophagy, published August 2024, https://doi.org/10.1080/15548627.2024.2383145) (yi2024spautin1promotespink1prkndependent pages 6-9, yi2024spautin1promotespink1prkndependent pages 1-2, yi2024spautin1promotespink1prkndependent pages 11-13).
- Neurodegeneration models and mitophagy: A 2024 review synthesizing C. elegans data reported that stimulating mitophagy reverses cognitive deficits in Aβ- and tau-driven models, with rescue requiring functional PINK-1 and PDR-1 and, in some contexts, DCT-1; pink-1 and pdr-1 mutants show depolarized mitochondria, reduced ATP, elevated ROS and Ca2+ (Antioxidants, published November 2024, https://doi.org/10.3390/antiox13111343) (ganguly2024mitochondrialqualitycontrol pages 14-15).

3) Current applications and real-world implementations
- In vivo mitophagy assays: Worm neuronal mitophagy reporters (e.g., mt-Rosella ratiometric biosensor) quantify mitophagic flux; spautin-1 at 1 μM enhances neuronal mitophagy in N2 and rescues mitophagy/learning deficits in AD-like strains in a pink-1/pdr-1–dependent manner, providing a tractable pharmacological tool and readout pipeline in C. elegans (Autophagy 2024) (yi2024spautin1promotespink1prkndependent pages 6-9, yi2024spautin1promotespink1prkndependent pages 11-13).
- Disease-modifying interventions: Pharmacological stimulation of mitophagy in worm AD models improves memory/behavioral phenotypes, and these effects require PINK-1/PDR-1. This positions pink-1 as an essential node for validating mitophagy-enhancing therapeutics in vivo (Antioxidants 2024) (ganguly2024mitochondrialqualitycontrol pages 14-15).
- Genetic interaction mapping: Antagonism between lrk-1 (LRRK2 homolog) and pink-1 informs epistasis tests in stress-response and neuronal morphology assays. Loss of lrk-1 suppresses pink-1 loss-of-function phenotypes (and vice versa for certain ER stress phenotypes), enabling pathway dissection in genetic screens (JBC 2009) (samann2009caenorhabdititseleganslrk1 pages 2-3, samann2009caenorhabdititseleganslrk1 pages 1-1).

4) Expert opinions and analysis from authoritative sources
- Mechanistic consensus: High-impact reviews concur that PINK1 is a mitochondrial stress sensor whose OMM stabilization upon depolarization is the trigger for a biochemical cascade: autophosphorylated PINK1 phosphorylates Ub and Parkin Ser65, amplifying ubiquitylation of OMM substrates and recruiting autophagy machinery for mitophagy (EMBO J 2021; Biophysical Reviews 2021) (onishi2021molecularmechanismsand pages 7-9, markaki2021mitophagymechanismsin pages 1-2).
- Integration with mitochondrial dynamics: PINK1–Parkin impacts fission/fusion components and mitochondrial motility; in worms, pink-1 loss alters cristae and stress responses, consistent with conserved roles in mitochondrial quality control (Cells 2018; JBC 2009). While Cells 2018 is mammalian-focused, its mechanistic framework aligns with worm observations (https://doi.org/10.3390/cells7100154) (salazar2018theinterplayamong pages 3-5, salazar2018theinterplayamong pages 19-21, samann2009caenorhabdititseleganslrk1 pages 2-3).
- Translational relevance in neurodegeneration: Reviews emphasize that mitophagy deficits and oxidative stress are central in PD and AD models, and that interventions restoring PINK1–Parkin signaling show functional rescue in C. elegans, underscoring target validity for therapeutic strategies (Antioxidants 2024; Biophysical Reviews 2021) (ganguly2024mitochondrialqualitycontrol pages 14-15, markaki2021mitophagymechanismsin pages 1-2).

5) Relevant statistics and data from recent and classical studies
- Localization and expression: A rescuing Ppink-1::pink-1::gfp transgene shows broad expression in neurons and other tissues with partial mitochondrial co-localization, validating identity and subcellular targeting in vivo (JBC 2009) (samann2009caenorhabdititseleganslrk1 pages 2-3, samann2009caenorhabdititseleganslrk1 pages 1-2).
- Ultrastructure and stress phenotypes: pink-1 loss reduces mitochondrial cristae length (approximately 12% reduction in body-wall muscle; >30% in neurons), increases paraquat (oxidative stress) sensitivity, and reduces brood size at 20 °C; these phenotypes are suppressed by lrk-1 loss, demonstrating antagonistic interaction (JBC 2009) (samann2009caenorhabdititseleganslrk1 pages 2-3, samann2009caenorhabdititseleganslrk1 pages 1-1).
- Biochemistry: PINK1 phosphorylates ubiquitin at Ser65 and Parkin Ser65; phospho-ubiquitin promotes Parkin activation and E3 ligase activity in vitro and in cells, forming a feed-forward mitophagy initiation loop (EMBO J 2021; Biophysical Reviews 2021) (onishi2021molecularmechanismsand pages 7-9, markaki2021mitophagymechanismsin pages 1-2).
- 2024 pharmacology in worms: Spautin-1 induces neuronal mitophagy and improves associative learning in C. elegans AD-like models at low micromolar doses; pink-1/pdr-1 knockdown abolishes the effect, demonstrating pathway dependence. Higher doses inhibit development/growth, consistent with macroautophagy inhibition, underscoring the importance of dosing windows (Autophagy 2024) (yi2024spautin1promotespink1prkndependent pages 6-9, yi2024spautin1promotespink1prkndependent pages 11-13).

Function and pathways in C. elegans pink-1
- Primary function: PINK-1 is a mitochondrial stress-activated serine/threonine kinase whose substrates include ubiquitin (Ser65) and Parkin/PRKN (Ser65). By phosphorylating Ub and Parkin on damaged mitochondria, PINK-1 recruits and activates the E3 ligase PDR-1 (Parkin), leading to ubiquitin-chain deposition on OMM proteins and recruitment of autophagy receptors to drive mitophagy (Biophysical Reviews 2021; EMBO J 2021) (markaki2021mitophagymechanismsin pages 1-2, onishi2021molecularmechanismsand pages 7-9).
- Substrate specificity: The best-established substrates are ubiquitin (Ser65) and Parkin’s Ubl domain (Ser65), with additional context-dependent targets in other species; the Ub/PRKN phosphorylation axis is conserved and central to mitophagy in worms (Biophysical Reviews 2021; Autophagy 2022) (markaki2021mitophagymechanismsin pages 1-2, zhang2022themultifacetedregulation pages 17-18).
- Localization/compartment: PINK-1 acts at the OMM under depolarization; in healthy mitochondria it is imported/cleaved and degraded. Worm transgenes and co-localization confirm mitochondrial targeting, with a cytosolic pool also observed (JBC 2009; Biophysical Reviews 2021) (samann2009caenorhabdititseleganslrk1 pages 2-3, markaki2021mitophagymechanismsin pages 1-2).
- Pathway integration: In worms, PINK-1 cooperates with PDR-1/Parkin to mediate mitophagy; DCT-1/BNIP3 can function with or upstream of PINK-1/PDR-1 depending on stimuli (Antioxidants 2024) (ganguly2024mitochondrialqualitycontrol pages 14-15).
- Genetic interactions: lrk-1 (LRRK2 homolog) and pink-1 act antagonistically; lrk-1 loss suppresses pink-1 phenotypes related to oxidative stress sensitivity, mitochondrial ultrastructure, and neurite outgrowth, highlighting interconnected stress-response networks (JBC 2009) (samann2009caenorhabdititseleganslrk1 pages 2-3, samann2009caenorhabdititseleganslrk1 pages 1-1).

Conclusions and outlook
C. elegans pink-1 encodes a conserved mitochondrial stress sensor kinase that triggers PDR-1/Parkin-mediated mitophagy by phosphorylating ubiquitin and Parkin at Ser65. Its mitochondrial targeting, import/cleavage/degradation under basal conditions, OMM stabilization upon depolarization, and feed-forward activation of mitophagy are well supported by structural and mechanistic work and validated in vivo in worms. Recent 2024 studies demonstrate that pharmacologic stabilization/activation of PINK1 (e.g., spautin-1) can restore neuronal mitophagy and learning in C. elegans neurodegeneration models in a pink-1/pdr-1–dependent manner, highlighting actionable therapeutic avenues and underscoring the value of worm models for pathway-dissection and compound triage (Autophagy 2024; Antioxidants 2024) (yi2024spautin1promotespink1prkndependent pages 6-9, ganguly2024mitochondrialqualitycontrol pages 14-15).

References

(samann2009caenorhabdititseleganslrk1 pages 2-3): Julia Sämann, Jan Hegermann, Erika von Gromoff, Stefan Eimer, Ralf Baumeister, and Enrico Schmidt. Caenorhabditits elegans lrk-1 and pink-1 act antagonistically in stress response and neurite outgrowth. Journal of Biological Chemistry, 284:16482-16491, Jun 2009. URL: https://doi.org/10.1074/jbc.m808255200, doi:10.1074/jbc.m808255200. This article has 224 citations and is from a domain leading peer-reviewed journal.
(onishi2021molecularmechanismsand pages 7-9): Mashun Onishi, Koji Yamano, Miyuki Sato, Noriyuki Matsuda, and Koji Okamoto. Molecular mechanisms and physiological functions of mitophagy. The EMBO Journal, Jan 2021. URL: https://doi.org/10.15252/embj.2020104705, doi:10.15252/embj.2020104705. This article has 1302 citations.
(markaki2021mitophagymechanismsin pages 1-2): Maria Markaki, Dikaia Tsagkari, and Nektarios Tavernarakis. Mitophagy mechanisms in neuronal physiology and pathology during ageing. Biophysical Reviews, 13:955-965, Nov 2021. URL: https://doi.org/10.1007/s12551-021-00894-7, doi:10.1007/s12551-021-00894-7. This article has 20 citations and is from a peer-reviewed journal.
(zhang2022themultifacetedregulation pages 17-18): Ting Zhang, Qian Liu, Weihua Gao, Sheikh Arslan Sehgal, and Hao Wu. The multifaceted regulation of mitophagy by endogenous metabolites. Autophagy, 18:1216-1239, Sep 2022. URL: https://doi.org/10.1080/15548627.2021.1975914, doi:10.1080/15548627.2021.1975914. This article has 167 citations and is from a domain leading peer-reviewed journal.
(ganguly2024mitochondrialqualitycontrol pages 14-15): Upasana Ganguly, Trae Carroll, Keith Nehrke, and Gail V. W. Johnson. Mitochondrial quality control in alzheimer’s disease: insights from caenorhabditis elegans models. Antioxidants, 13:1343, Nov 2024. URL: https://doi.org/10.3390/antiox13111343, doi:10.3390/antiox13111343. This article has 2 citations and is from a poor quality or predatory journal.
(yi2024spautin1promotespink1prkndependent pages 6-9): Juan Yi, He-Ling Wang, Guang Lu, Hailong Zhang, Lina Wang, Zhen-Yu Li, Liming Wang, Yihua Wu, Dajing Xia, Evandro F. Fang, and Han-Ming Shen. Spautin-1 promotes pink1-prkn-dependent mitophagy and improves associative learning capability in an alzheimer disease animal model. Autophagy, 20:2655-2676, Aug 2024. URL: https://doi.org/10.1080/15548627.2024.2383145, doi:10.1080/15548627.2024.2383145. This article has 30 citations and is from a domain leading peer-reviewed journal.
(yi2024spautin1promotespink1prkndependent pages 1-2): Juan Yi, He-Ling Wang, Guang Lu, Hailong Zhang, Lina Wang, Zhen-Yu Li, Liming Wang, Yihua Wu, Dajing Xia, Evandro F. Fang, and Han-Ming Shen. Spautin-1 promotes pink1-prkn-dependent mitophagy and improves associative learning capability in an alzheimer disease animal model. Autophagy, 20:2655-2676, Aug 2024. URL: https://doi.org/10.1080/15548627.2024.2383145, doi:10.1080/15548627.2024.2383145. This article has 30 citations and is from a domain leading peer-reviewed journal.
(yi2024spautin1promotespink1prkndependent pages 11-13): Juan Yi, He-Ling Wang, Guang Lu, Hailong Zhang, Lina Wang, Zhen-Yu Li, Liming Wang, Yihua Wu, Dajing Xia, Evandro F. Fang, and Han-Ming Shen. Spautin-1 promotes pink1-prkn-dependent mitophagy and improves associative learning capability in an alzheimer disease animal model. Autophagy, 20:2655-2676, Aug 2024. URL: https://doi.org/10.1080/15548627.2024.2383145, doi:10.1080/15548627.2024.2383145. This article has 30 citations and is from a domain leading peer-reviewed journal.
(samann2009caenorhabdititseleganslrk1 pages 1-1): Julia Sämann, Jan Hegermann, Erika von Gromoff, Stefan Eimer, Ralf Baumeister, and Enrico Schmidt. Caenorhabditits elegans lrk-1 and pink-1 act antagonistically in stress response and neurite outgrowth. Journal of Biological Chemistry, 284:16482-16491, Jun 2009. URL: https://doi.org/10.1074/jbc.m808255200, doi:10.1074/jbc.m808255200. This article has 224 citations and is from a domain leading peer-reviewed journal.
(salazar2018theinterplayamong pages 3-5): Celia Salazar, Paula Ruiz-Hincapie, and Lina María Ruiz. The interplay among pink1/parkin/dj-1 network during mitochondrial quality control in cancer biology: protein interaction analysis. Cells, 7:154, Sep 2018. URL: https://doi.org/10.3390/cells7100154, doi:10.3390/cells7100154. This article has 70 citations and is from a poor quality or predatory journal.
(salazar2018theinterplayamong pages 19-21): Celia Salazar, Paula Ruiz-Hincapie, and Lina María Ruiz. The interplay among pink1/parkin/dj-1 network during mitochondrial quality control in cancer biology: protein interaction analysis. Cells, 7:154, Sep 2018. URL: https://doi.org/10.3390/cells7100154, doi:10.3390/cells7100154. This article has 70 citations and is from a poor quality or predatory journal.
(samann2009caenorhabdititseleganslrk1 pages 1-2): Julia Sämann, Jan Hegermann, Erika von Gromoff, Stefan Eimer, Ralf Baumeister, and Enrico Schmidt. Caenorhabditits elegans lrk-1 and pink-1 act antagonistically in stress response and neurite outgrowth. Journal of Biological Chemistry, 284:16482-16491, Jun 2009. URL: https://doi.org/10.1074/jbc.m808255200, doi:10.1074/jbc.m808255200. This article has 224 citations and is from a domain leading peer-reviewed journal.

Citations

ganguly2024mitochondrialqualitycontrol pages 14-15
onishi2021molecularmechanismsand pages 7-9
markaki2021mitophagymechanismsin pages 1-2
zhang2022themultifacetedregulation pages 17-18
salazar2018theinterplayamong pages 3-5
salazar2018theinterplayamong pages 19-21
https://doi.org/10.1074/jbc.m808255200;
https://doi.org/10.15252/embj.2020104705
https://doi.org/10.1007/s12551-021-00894-7;
https://doi.org/10.15252/embj.2020104705;
https://doi.org/10.1080/15548627.2021.1975914
https://doi.org/10.3390/antiox13111343
https://doi.org/10.1080/15548627.2024.2383145
https://doi.org/10.3390/cells7100154
https://doi.org/10.1074/jbc.m808255200,
https://doi.org/10.15252/embj.2020104705,
https://doi.org/10.1007/s12551-021-00894-7,
https://doi.org/10.1080/15548627.2021.1975914,
https://doi.org/10.3390/antiox13111343,
https://doi.org/10.1080/15548627.2024.2383145,
https://doi.org/10.3390/cells7100154,

Bioreason Rl Review

(pink-1-bioreason-rl-review.md)

BioReason-Pro RL Review: pink-1 (C. elegans)

Source: pink-1-deep-research-bioreason-rl.md

Correctness: 4/5
Completeness: 3/5

Functional Summary Review

The BioReason functional summary states:

A soluble mitochondrial kinase in Caenorhabditis elegans that uses an atypical protein kinase core to bind ATP and phosphorylate targets central to organelle surveillance. By assembling and regulating signaling hubs at the mitochondrial interface, it coordinates quality control pathways that balance repair with selective removal of damaged organelles. Its scaffold-like behavior positions substrates and adaptors within the mitochondrial compartment, coupling phosphorylation to broader programs of organelle organization and homeostasis.

This is a strong summary that captures several key aspects of PINK-1 biology:

Mitochondrial kinase: correct, matches GO:0004674 (protein serine/threonine kinase activity) and mitochondrial localization
"Atypical protein kinase core" from the PINK1-specific domain (IPR040110): accurate
"Organelle surveillance" and "quality control pathways": correctly identifies the mitochondrial quality control function
"Balance repair with selective removal of damaged organelles": this accurately captures the mitophagy decision (GO:0000422, autophagy of mitochondrion)
"Scaffold-like behavior": reasonably describes PINK-1's role in assembling the ubiquitination cascade

The correctness score is docked because "soluble mitochondrial kinase" is slightly misleading. The curated review specifies that PINK-1 has a transmembrane domain and under damage conditions accumulates as a full-length protein on the outer mitochondrial membrane -- it is not simply soluble within the mitochondrial matrix.

Key missing aspects:

The specific mechanism: PINK-1 phosphorylates ubiquitin at Ser65 and PDR-1/Parkin at Ser65, initiating a feed-forward ubiquitination cascade
The import/stabilization sensing mechanism: under normal conditions PINK-1 is imported and degraded; upon depolarization it stabilizes on the OMM
The antagonistic relationship with LRK-1 (LRRK2 homolog)
Axon guidance defects in pink-1 mutants
Paraquat sensitivity and cristae length defects

Comparison with interpro2go:

The interpro2go annotation (GO_REF:0000002) assigns GO:0004672 (protein kinase activity). BioReason substantially surpasses this by correctly identifying the mitochondrial quality control context from the IPR051511 (Mitochondrial Quality Control and Scaffold Kinases) family assignment. This demonstrates that family-level InterPro annotations can provide genuine biological insight when properly interpreted.

Notes on thinking trace

The trace correctly leverages the PINK1-specific domain (IPR040110) and the Mitochondrial Quality Control and Scaffold Kinases family (IPR051511) to infer mitophagy-related function. The reasoning about "phosphorylation gates the assembly of ubiquitination and autophagy machinery" is close to the actual mechanism. This is a case where informative family-level annotations enable good functional inference.

📄 View Raw YAML

id: Q09298
gene_symbol: pink-1
product_type: PROTEIN
status: IN_PROGRESS
taxon:
  id: NCBITaxon:6239
  label: Caenorhabditis elegans
description: PINK-1 is the C. elegans ortholog of mammalian PINK1 (PTEN-induced 
  kinase 1), a mitochondrial serine/threonine kinase that functions as a key 
  sensor of mitochondrial damage and initiator of mitophagy. The protein 
  contains an N-terminal mitochondrial targeting sequence (residues 1-74), a 
  transmembrane domain, and a cytosol-facing protein kinase catalytic domain 
  (residues 137-483). Under normal conditions with healthy mitochondria, PINK-1 
  is imported into mitochondria and cleaved by proteases. Upon mitochondrial 
  depolarization or damage, full-length PINK-1 accumulates on the outer 
  mitochondrial membrane where it autophosphorylates and becomes active. 
  Activated PINK-1 phosphorylates ubiquitin at Ser65 and also phosphorylates 
  PDR-1 (the C. elegans Parkin homolog) at Ser65, promoting PDR-1 activation and
  recruitment. This initiates a feed-forward ubiquitination cascade that labels 
  damaged mitochondria for autophagic clearance (mitophagy). In C. elegans, 
  PINK-1 is required for mitophagy, mitochondrial quality control during aging, 
  and stress responses including oxidative stress. pink-1 mutants show reduced 
  mitochondrial cristae length, increased paraquat sensitivity, and defects in 
  axon guidance. PINK-1 acts antagonistically to LRK-1 (LRRK2 homolog) in stress
  response and neurite outgrowth.
existing_annotations:
  - term:
      id: GO:0000422
      label: autophagy of mitochondrion
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: IBA annotation based on phylogenetic inference from orthologs. 
        This annotation accurately reflects the core function of PINK-1 in 
        initiating mitophagy. The PINK-1/PDR-1 pathway is the canonical 
        mitophagy pathway in C. elegans, and multiple studies demonstrate 
        PINK-1's essential role in this process [PMID:25896323, 
        file:worm/pink-1/pink-1-deep-research-falcon.md].
      action: ACCEPT
      reason: PINK-1 is a central regulator of mitophagy. Upon mitochondrial 
        depolarization, PINK-1 stabilizes on the outer mitochondrial membrane 
        where it phosphorylates ubiquitin and PDR-1/Parkin to initiate the 
        mitophagic cascade. This is well-established across species and 
        supported by direct experimental evidence in C. elegans. The IBA 
        annotation is phylogenetically sound and consistent with experimental 
        data.
      supported_by:
        - reference_id: PMID:25896323
          supporting_text: DCT-1 is a key mediator of mitophagy and longevity 
            assurance under conditions of stress in C. elegans
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: The PINK-1/PDR-1 (Parkin homolog) pathway mediates 
            mitophagy and mitochondrial quality control in worms
  - term:
      id: GO:0004674
      label: protein serine/threonine kinase activity
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: IBA annotation for the core molecular function of PINK-1 as a 
        serine/threonine kinase. PINK-1 contains a conserved protein kinase 
        domain (residues 137-483) and is classified in the Ser/Thr protein 
        kinase family. The kinase catalyzes phosphorylation of serine residues 
        on ubiquitin (Ser65) and Parkin/PDR-1 (Ser65 in the Ubl domain).
      action: ACCEPT
      reason: This is the fundamental molecular function of PINK-1. The protein 
        contains a conserved kinase domain with canonical N- and C-lobes and 
        PINK1-specific insert regions. UniProt records the catalytic activity 
        (EC 2.7.11.1) and the active site at position 338. The annotation is 
        appropriately specific and reflects the core enzymatic activity.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: Serine/threonine-protein kinase pink-1, mitochondrial
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: IBA annotation for mitochondrial localization. PINK-1 contains an
        N-terminal mitochondrial targeting sequence (residues 1-74) and 
        localizes to mitochondria. This localization is described in the deep 
        research file based on PMID:19251702 and other sources.
      action: ACCEPT
      reason: Mitochondrial localization is central to PINK-1 function. The 
        N-terminal transit peptide directs PINK-1 to mitochondria. Under normal 
        conditions PINK-1 is imported and cleaved; upon mitochondrial damage, 
        full-length PINK-1 accumulates on the outer mitochondrial membrane where
        it functions.
      supported_by:
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: A rescuing Ppink-1::pink-1::gfp transgene shows broad
            expression in neurons and other tissues with partial mitochondrial 
            co-localization
  - term:
      id: GO:0042981
      label: regulation of apoptotic process
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: IBA annotation suggesting PINK-1 involvement in regulation of 
        apoptosis. While mammalian PINK1 has been implicated in apoptosis 
        regulation, direct experimental evidence for this role in C. elegans is 
        limited. The primary role of PINK-1 in worms appears to be in mitophagy 
        and mitochondrial quality control rather than direct apoptosis 
        regulation.
      action: KEEP_AS_NON_CORE
      reason: PINK1 involvement in apoptosis regulation is primarily 
        characterized in mammalian systems. While mitochondrial dysfunction 
        (which PINK-1 regulates) can influence apoptotic pathways, direct 
        evidence for PINK-1 regulation of apoptosis in C. elegans is not well 
        established. The annotation may be valid based on phylogenetic inference
        but represents a secondary rather than core function in worms.
      supported_by:
        - reference_id: GO_REF:0000033
          supporting_text: '[IBA annotation inferred from phylogenetic trees]'
  - term:
      id: GO:0090141
      label: positive regulation of mitochondrial fission
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: IBA annotation for positive regulation of mitochondrial fission. 
        PINK-1 and Parkin are known to impact mitochondrial dynamics including 
        fission/fusion. In C. elegans, pink-1 loss leads to altered 
        mitochondrial morphology as described in the deep research file.
      action: ACCEPT
      reason: PINK-1/Parkin impacts mitochondrial dynamics as part of the 
        mitophagy quality control process. Damaged mitochondria undergo fission 
        before mitophagic clearance. The IBA annotation reflects conserved roles
        in mitochondrial dynamics.
      supported_by:
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: PINK1-Parkin impacts fission/fusion components and 
            mitochondrial motility; in worms, pink-1 loss alters cristae and 
            stress responses
  - term:
      id: GO:0000166
      label: nucleotide binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: IEA annotation based on UniProtKB keyword mapping. PINK-1 is a 
        kinase that requires ATP for catalysis. The annotation is correct but 
        overly general - ATP binding (GO:0005524) is a more specific and 
        informative term.
      action: ACCEPT
      reason: This is a correct but broad annotation. PINK-1 binds ATP as a 
        kinase substrate. The annotation is technically accurate but less 
        informative than GO:0005524 (ATP binding), which is also annotated. 
        Acceptable as a parent term capture.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: Nucleotide-binding; Reference proteome; 
            Serine/threonine-protein kinase
  - term:
      id: GO:0004672
      label: protein kinase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: IEA annotation from InterPro domain IPR000719 (protein kinase 
        domain). PINK-1 has a well-characterized protein kinase domain. This 
        annotation is correct but less specific than GO:0004674 (protein 
        serine/threonine kinase activity).
      action: ACCEPT
      reason: Correct annotation based on the presence of the protein kinase 
        domain. While GO:0004674 (protein serine/threonine kinase activity) is 
        more specific and also annotated, this parent term is acceptable as a 
        complementary IEA annotation.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: InterPro; IPR000719; Prot_kinase_dom
  - term:
      id: GO:0004674
      label: protein serine/threonine kinase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: IEA annotation from combined automated methods including InterPro
        and EC number. Duplicates the IBA annotation for the same term. PINK-1 
        is a serine/threonine kinase (EC 2.7.11.1) that phosphorylates ubiquitin
        Ser65 and Parkin Ser65.
      action: ACCEPT
      reason: Duplicate of the IBA annotation but via different evidence. The 
        annotation is correct - PINK-1 is a serine/threonine kinase with defined
        catalytic activity. Having both IBA and IEA evidence provides 
        independent support.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: Belongs to the protein kinase superfamily. Ser/Thr 
            protein kinase family.
  - term:
      id: GO:0005524
      label: ATP binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: IEA annotation for ATP binding. PINK-1 binds ATP as a substrate 
        for its kinase activity. The ATP binding site is located at residues 
        143-151 and 199, as defined in the UniProt feature annotations.
      action: ACCEPT
      reason: ATP binding is essential for PINK-1 kinase activity. The 
        annotation is well-supported by the presence of canonical ATP-binding 
        motifs in the kinase domain and explicit binding site annotations in 
        UniProt. This is more specific and informative than the general 
        nucleotide binding annotation.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: ATP-binding; Kinase; Magnesium; Metal-binding; 
            Mitochondrion
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: IEA annotation for mitochondrial localization. Duplicates the IBA
        annotation. PINK-1 contains an N-terminal mitochondrial transit peptide 
        (residues 1-74) that targets it to mitochondria.
      action: ACCEPT
      reason: Correct annotation supported by the presence of a mitochondrial 
        targeting sequence and UniProt subcellular location annotation. The IEA 
        provides computational support for the IBA and IDA annotations for this 
        localization.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: 'SUBCELLULAR LOCATION: Mitochondrion'
  - term:
      id: GO:0006950
      label: response to stress
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: IEA annotation from ARBA machine learning models. PINK-1 is 
        involved in stress responses, particularly mitochondrial stress and 
        oxidative stress. However, this term is very broad and more specific 
        annotations exist (e.g., GO:0034599 cellular response to oxidative 
        stress).
      action: ACCEPT
      reason: PINK-1 is indeed involved in stress responses, functioning as a 
        mitochondrial stress sensor. While the term is broad, it is not 
        incorrect. More specific stress-related annotations (oxidative stress, 
        ER stress) provide additional detail. The broad term captures the 
        general stress-responsive role of PINK-1.
      supported_by:
        - reference_id: PMID:19251702
          supporting_text: increased vulnerability to oxidative and endoplasmic 
            reticulum stress
  - term:
      id: GO:0016301
      label: kinase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: IEA annotation based on keyword mapping. Very broad parent term 
        of the more specific protein serine/threonine kinase activity 
        annotation. PINK-1 is a kinase.
      action: ACCEPT
      reason: This is a correct but very general annotation. It is a parent term
        of GO:0004674 (protein serine/threonine kinase activity) which is also 
        annotated. Acceptable as broad IEA capture but provides less information
        than the specific kinase type.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: Kinase; Magnesium; Metal-binding; Mitochondrion
  - term:
      id: GO:0016740
      label: transferase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: IEA annotation based on keyword mapping. Very broad parent term -
        kinases are transferases that transfer phosphate groups. This is the 
        highest-level function class for PINK-1.
      action: ACCEPT
      reason: Correct but extremely general annotation. Kinases are a subclass 
        of transferases (they transfer phosphate groups from ATP to substrates).
        The annotation is technically accurate but provides minimal functional 
        insight. Acceptable as broad IEA capture.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: Transferase; Transit peptide
  - term:
      id: GO:0046872
      label: metal ion binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: IEA annotation for metal ion binding. PINK-1 requires Mg2+ as a 
        cofactor for kinase activity, which is typical for protein kinases.
      action: ACCEPT
      reason: Protein kinases require divalent metal ions (typically Mg2+) for 
        catalytic activity. UniProt records Mg2+ as a cofactor for PINK-1. This 
        is a correct annotation reflecting the metal ion requirement for 
        phosphotransfer reactions.
      supported_by:
        - reference_id: UniProt:Q09298
          supporting_text: Name=Mg(2+); Xref=ChEBI:CHEBI:18420
  - term:
      id: GO:0106310
      label: protein serine kinase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000116
    review:
      summary: IEA annotation from Rhea reaction mapping. PINK-1 phosphorylates 
        serine residues, specifically Ser65 of ubiquitin and Ser65 of Parkin. 
        The Rhea database links the catalytic reaction (RHEA:17989) to this GO 
        term.
      action: ACCEPT
      reason: The best-characterized substrates of PINK1 are phosphorylated on 
        serine residues (ubiquitin Ser65, Parkin Ser65). This annotation is 
        appropriately specific and supported by the known substrate specificity.
        Complements the broader serine/threonine kinase activity annotation.
      supported_by:
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: The best-established substrates are ubiquitin (Ser65)
            and Parkin's Ubl domain (Ser65)
  - term:
      id: GO:0000423
      label: mitophagy
    evidence_type: IMP
    original_reference_id: PMID:26469957
    review:
      summary: IMP annotation based on mutant phenotype analysis in C. elegans. 
        The study showed that a bacterial metabolite induces PINK-1-dependent 
        autophagy, and pink-1 loss eliminates the autophagic response to 
        mitochondrial stress.
      action: ACCEPT
      reason: Direct experimental evidence in C. elegans demonstrating PINK-1's 
        role in mitophagy. The study showed that metabolite-induced autophagy 
        was PINK-1 dependent, and pink-1 loss-of-function epistatically 
        regulated the effects of the metabolite on proteostasis and 
        mitochondrial morphology.
      supported_by:
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: The PINK-1/PDR-1 (Parkin homolog) pathway mediates 
            mitophagy and mitochondrial quality control in worms
        - reference_id: PMID:26469957
          supporting_text: A bacterial metabolite induces glutathione-tractable 
            proteostatic damage, proteasomal disturbances, and PINK1-dependent 
            autophagy in C.
  - term:
      id: GO:0000423
      label: mitophagy
    evidence_type: IMP
    original_reference_id: PMID:25896323
    review:
      summary: IMP annotation from a key Nature paper demonstrating PINK-1 role 
        in mitophagy during aging in C. elegans. The study established that 
        mitophagy coordinates with mitochondrial biogenesis and that 
        PINK-1/PDR-1 pathway is essential for this process.
      action: ACCEPT
      reason: High-quality evidence from a Nature publication establishing 
        PINK-1's central role in mitophagy in C. elegans. The study showed that 
        impairment of mitophagy compromises stress resistance and that the 
        PINK-1/PDR-1 pathway is critical for mitochondrial quality control 
        during aging. This is a core function.
      supported_by:
        - reference_id: PMID:25896323
          supporting_text: Impairment of mitophagy compromises stress resistance
            and triggers mitochondrial retrograde signalling
        - reference_id: UniProt:Q09298
          supporting_text: Plays a role in mitophagy (PubMed:25896323)
  - term:
      id: GO:0031398
      label: positive regulation of protein ubiquitination
    evidence_type: IMP
    original_reference_id: PMID:25896323
    review:
      summary: IMP annotation for PINK-1's role in promoting protein 
        ubiquitination. PINK-1 phosphorylates ubiquitin and Parkin to activate 
        the ubiquitin ligase activity of Parkin/PDR-1, leading to ubiquitination
        of outer mitochondrial membrane proteins.
      action: ACCEPT
      reason: This accurately reflects PINK-1's mechanism of action. Activated 
        PINK-1 phosphorylates ubiquitin at Ser65 and Parkin at Ser65, which 
        promotes Parkin's E3 ligase activity and creates a feed-forward loop of 
        ubiquitination. This leads to ubiquitin chain deposition on 
        mitochondrial proteins and recruitment of autophagy machinery.
      supported_by:
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: Activated PINK1 phosphorylates ubiquitin at Ser65 and
            also phosphorylates Parkin (PRKN) on Ser65 in its Ubl domain, 
            promoting Parkin activation
        - reference_id: PMID:25896323
          supporting_text: Coordination of mitophagy and mitochondrial 
            biogenesis during ageing in C.
  - term:
      id: GO:0034976
      label: response to endoplasmic reticulum stress
    evidence_type: IGI
    original_reference_id: PMID:19251702
    review:
      summary: IGI annotation based on genetic interaction with lrk-1. The study
        showed that lrk-1 mutants are hypersensitive to ER stress (tunicamycin),
        and this was reduced in a pink-1 mutant background, demonstrating 
        antagonistic interaction.
      action: KEEP_AS_NON_CORE
      reason: The annotation is based on genetic interaction showing that pink-1
        mutation suppresses the ER stress sensitivity of lrk-1 mutants. This 
        indicates PINK-1 is involved in ER stress response, but the mechanism is
        indirect - through antagonistic interaction with LRK-1 rather than 
        direct ER stress sensing. This is a secondary function related to the 
        stress response network involving PINK-1 and LRK-1.
      supported_by:
        - reference_id: PMID:19251702
          supporting_text: the hypersensitivity of lrk-1 mutant animals to the 
            endoplasmic reticulum stressor tunicamycin was reduced in a pink-1 
            mutant background
  - term:
      id: GO:0007005
      label: mitochondrion organization
    evidence_type: IMP
    original_reference_id: PMID:19251702
    review:
      summary: IMP annotation based on mutant phenotype. pink-1 mutants show 
        reduced mitochondrial cristae length in body-wall muscle (approximately 
        12% reduction) and neurons (>30% reduction), demonstrating PINK-1's role
        in mitochondrial organization/morphology.
      action: ACCEPT
      reason: Direct experimental evidence in C. elegans showing that pink-1 
        loss affects mitochondrial ultrastructure. The reduced cristae length 
        indicates PINK-1 is required for proper mitochondrial organization. This
        is consistent with PINK-1's role in mitochondrial quality control.
      supported_by:
        - reference_id: PMID:19251702
          supporting_text: a mutation in the Caenorhabditits elegans homologue 
            of the PTEN-induced kinase pink-1 gene resulted in reduced 
            mitochondrial cristae length
  - term:
      id: GO:0007411
      label: axon guidance
    evidence_type: IMP
    original_reference_id: PMID:19251702
    review:
      summary: IMP annotation based on mutant phenotype. pink-1 mutants display 
        defects in axonal outgrowth of canal-associated neurons (CAN neurons). 
        These defects are suppressed by lrk-1 loss, indicating antagonistic 
        function.
      action: KEEP_AS_NON_CORE
      reason: Direct experimental evidence shows pink-1 mutants have axon 
        guidance defects. However, this appears to be a secondary consequence of
        mitochondrial dysfunction rather than a direct role in axon guidance 
        signaling. The phenotype is suppressed by lrk-1 loss, suggesting it 
        reflects the stress response network. Not a core function of PINK-1.
      supported_by:
        - reference_id: PMID:19251702
          supporting_text: the mutants also displayed defects in axonal 
            outgrowth of a pair of canal-associated neurons
  - term:
      id: GO:0034599
      label: cellular response to oxidative stress
    evidence_type: IMP
    original_reference_id: PMID:19251702
    review:
      summary: IMP annotation based on mutant phenotype. pink-1 mutants show 
        increased sensitivity to paraquat, a known inducer of oxidative stress. 
        This demonstrates PINK-1's role in protection against oxidative stress.
      action: ACCEPT
      reason: Direct experimental evidence showing pink-1 mutants are 
        hypersensitive to oxidative stress (paraquat). This is consistent with 
        PINK-1's role in mitochondrial quality control - damaged mitochondria 
        are major sources of ROS, and failure to clear them leads to increased 
        oxidative damage. The annotation reflects a core protective function.
      supported_by:
        - reference_id: PMID:19251702
          supporting_text: reduced mitochondrial cristae length and increased 
            paraquat sensitivity of the nematode
  - term:
      id: GO:0048846
      label: axon extension involved in axon guidance
    evidence_type: IMP
    original_reference_id: PMID:19251702
    review:
      summary: IMP annotation for more specific aspect of axon guidance. pink-1 
        mutants show defects in axonal extension of CAN neurons.
      action: KEEP_AS_NON_CORE
      reason: This is a more specific child term of axon guidance (GO:0007411). 
        The experimental evidence is the same - pink-1 mutants have CAN neuron 
        axonal outgrowth defects. As with the parent term, this likely 
        represents a secondary consequence of mitochondrial dysfunction rather 
        than a direct axon extension function.
      supported_by:
        - reference_id: PMID:19251702
          supporting_text: the mutants also displayed defects in axonal 
            outgrowth of a pair of canal-associated neurons
  - term:
      id: GO:0048846
      label: axon extension involved in axon guidance
    evidence_type: IGI
    original_reference_id: PMID:19251702
    review:
      summary: IGI annotation based on genetic interaction with lrk-1. Loss of 
        lrk-1 suppresses the axon extension defects of pink-1 mutants, 
        demonstrating antagonistic interaction.
      action: KEEP_AS_NON_CORE
      reason: Duplicate term with different evidence code. The genetic 
        interaction evidence supports the antagonistic relationship between 
        PINK-1 and LRK-1 in neuronal development. This reflects the stress 
        response/neuronal function network rather than a core function of 
        PINK-1.
      supported_by:
        - reference_id: PMID:19251702
          supporting_text: in the absence of lrk-1, the C. elegans homologue of 
            human LRRK2, all phenotypic aspects of pink-1 loss-of-function 
            mutants were suppressed
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IDA
    original_reference_id: PMID:19251702
    review:
      summary: IDA annotation for cytoplasmic localization based on GFP-tagged 
        PINK-1 imaging. The study showed PINK-1::GFP localizes to both 
        mitochondria and cytoplasm.
      action: ACCEPT
      reason: Direct experimental evidence from imaging of PINK-1::GFP 
        transgene. PINK-1 is found in both mitochondria and cytoplasm. Under 
        normal conditions, PINK-1 is imported into mitochondria, cleaved, and 
        retrotranslocated to cytoplasm for degradation. The cytoplasmic pool 
        reflects this processing pathway.
      supported_by:
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: A rescuing Ppink-1::pink-1::gfp transgene shows broad
            expression in neurons and other tissues with partial mitochondrial 
            co-localization
        - reference_id: PMID:19251702
          supporting_text: Epub 2009 Feb 27. Caenorhabditits elegans LRK-1 and 
            PINK-1 act antagonistically in stress response and neurite 
            outgrowth.
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: IDA
    original_reference_id: PMID:19251702
    review:
      summary: IDA annotation for mitochondrial localization based on direct 
        imaging of PINK-1::GFP in C. elegans. Shows co-localization with 
        mitochondrial markers.
      action: ACCEPT
      reason: High-quality direct experimental evidence. PINK-1::GFP shows 
        mitochondrial co-localization, confirming that PINK-1 targets to 
        mitochondria as expected from its N-terminal mitochondrial targeting 
        sequence. This is the primary site of PINK-1 function in mitophagy 
        initiation.
      supported_by:
        - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
          supporting_text: A rescuing Ppink-1::pink-1::gfp transgene shows broad
            expression in neurons and other tissues with partial mitochondrial 
            co-localization
        - reference_id: PMID:19251702
          supporting_text: Epub 2009 Feb 27. Caenorhabditits elegans LRK-1 and 
            PINK-1 act antagonistically in stress response and neurite 
            outgrowth.
references:
  - id: GO_REF:0000002
    title: Gene Ontology annotation through association of InterPro records with
      GO terms
    findings: []
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings:
      - statement: PAINT/IBA annotations provide phylogenetically consistent 
          annotations based on well-characterized orthologs
  - id: GO_REF:0000043
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword 
      mapping
    findings: []
  - id: GO_REF:0000116
    title: Automatic Gene Ontology annotation based on Rhea mapping
    findings: []
  - id: GO_REF:0000117
    title: Electronic Gene Ontology annotations created by ARBA machine learning
      models
    findings: []
  - id: GO_REF:0000120
    title: Combined Automated Annotation using Multiple IEA Methods
    findings: []
  - id: PMID:19251702
    title: Caenorhabditits elegans LRK-1 and PINK-1 act antagonistically in 
      stress response and neurite outgrowth.
    findings:
      - statement: pink-1 mutants have reduced mitochondrial cristae length and 
          increased paraquat sensitivity
        supporting_text: a mutation in the Caenorhabditits elegans homologue of 
          the PTEN-induced kinase pink-1 gene resulted in reduced mitochondrial 
          cristae length and increased paraquat sensitivity of the nematode
      - statement: pink-1 mutants display axon guidance defects in CAN neurons
        supporting_text: the mutants also displayed defects in axonal outgrowth 
          of a pair of canal-associated neurons
      - statement: lrk-1 loss suppresses all pink-1 phenotypes
        supporting_text: in the absence of lrk-1, the C. elegans homologue of 
          human LRRK2, all phenotypic aspects of pink-1 loss-of-function mutants
          were suppressed
      - statement: pink-1 loss reduces lrk-1 ER stress sensitivity (tunicamycin)
        supporting_text: the hypersensitivity of lrk-1 mutant animals to the 
          endoplasmic reticulum stressor tunicamycin was reduced in a pink-1 
          mutant background
  - id: PMID:25896323
    title: Coordination of mitophagy and mitochondrial biogenesis during ageing 
      in C. elegans.
    findings:
      - statement: PINK-1/PDR-1 pathway is essential for mitophagy in C. elegans
        supporting_text: DCT-1 is a key mediator of mitophagy and longevity 
          assurance under conditions of stress in C. elegans
      - statement: Mitophagy coordinates with mitochondrial biogenesis during 
          aging
        supporting_text: mitophagy, a selective type of autophagy targeting 
          mitochondria for degradation, interfaces with mitochondrial biogenesis
          to regulate mitochondrial content and longevity
      - statement: Impairment of mitophagy compromises stress resistance
        supporting_text: Impairment of mitophagy compromises stress resistance 
          and triggers mitochondrial retrograde signalling
  - id: PMID:26469957
    title: A bacterial metabolite induces glutathione-tractable proteostatic 
      damage, proteasomal disturbances, and PINK1-dependent autophagy in C. 
      elegans.
    findings:
      - statement: Metabolite-induced autophagy is PINK-1 dependent
        supporting_text: the induced autophagy observed in metabolite-treated 
          animals is PINK-1 dependent
      - statement: PINK-1 is required for stress-induced autophagic response
        supporting_text: animals with reduced pink-1 no longer have increased 
          mCherry::LGG-1 accumulation in the presence of the metabolite
  - id: file:worm/pink-1/pink-1-deep-research-falcon.md
    title: Deep research on C. elegans pink-1
    findings:
      - statement: PINK-1 is a mitochondrial stress-activated serine/threonine 
          kinase
        supporting_text: PINK-1 is a mitochondrial stress-activated 
          serine/threonine kinase whose substrates include ubiquitin (Ser65) and
          Parkin/PRKN (Ser65)
      - statement: PINK-1 localizes to mitochondria with a cytoplasmic pool
        supporting_text: A rescuing Ppink-1::pink-1::gfp transgene shows broad 
          expression in neurons and other tissues with partial mitochondrial 
          co-localization
      - statement: pink-1 loss reduces mitochondrial cristae length
        supporting_text: pink-1 loss reduces mitochondrial cristae length 
          (approximately 12% reduction in body-wall muscle; >30% in neurons)
core_functions:
  - molecular_function:
      id: GO:0004674
      label: protein serine/threonine kinase activity
    directly_involved_in:
      - id: GO:0000423
        label: mitophagy
    locations:
      - id: GO:0005739
        label: mitochondrion
    description: PINK-1 is a serine/threonine kinase that phosphorylates 
      ubiquitin (Ser65) and Parkin/PDR-1 (Ser65) to activate the mitophagic 
      cascade at the outer mitochondrial membrane. Loss of pink-1 eliminates 
      stress-induced autophagic responses and prevents clearance of damaged 
      mitochondria.
    supported_by:
      - reference_id: PMID:25896323
        supporting_text: Impairment of mitophagy compromises stress resistance 
          and triggers mitochondrial retrograde signalling
      - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
        supporting_text: The PINK-1/PDR-1 (Parkin homolog) pathway mediates 
          mitophagy and mitochondrial quality control in worms
  - molecular_function:
      id: GO:0004674
      label: protein serine/threonine kinase activity
    directly_involved_in:
      - id: GO:0031398
        label: positive regulation of protein ubiquitination
    locations:
      - id: GO:0005739
        label: mitochondrion
    description: PINK-1 phosphorylates ubiquitin and Parkin to activate Parkin's
      E3 ligase activity, promoting ubiquitination of outer mitochondrial 
      membrane proteins as part of the mitophagy initiation cascade.
    supported_by:
      - reference_id: file:worm/pink-1/pink-1-deep-research-falcon.md
        supporting_text: Activated PINK1 phosphorylates ubiquitin at Ser65 and 
          also phosphorylates Parkin (PRKN) on Ser65 in its Ubl domain, 
          promoting Parkin activation
  - molecular_function:
      id: GO:0004674
      label: protein serine/threonine kinase activity
    directly_involved_in:
      - id: GO:0034599
        label: cellular response to oxidative stress
    locations:
      - id: GO:0005739
        label: mitochondrion
    description: pink-1 mutants are hypersensitive to paraquat-induced oxidative
      stress. PINK-1-dependent clearance of damaged mitochondria (which produce 
      ROS) is protective against oxidative damage.
    supported_by:
      - reference_id: PMID:19251702
        supporting_text: reduced mitochondrial cristae length and increased 
          paraquat sensitivity of the nematode
proposed_new_terms: []
suggested_questions:
  - question: What are the direct phosphorylation substrates of C. elegans 
      PINK-1 beyond the conserved ubiquitin Ser65?
  - question: Does C. elegans PINK-1 have kinase-independent functions as 
      observed in some mammalian studies?
  - question: What is the precise mechanism of PINK-1/LRK-1 antagonism in stress
      response?
suggested_experiments:
  - description: In vitro kinase assays with purified C. elegans PINK-1 to 
      identify substrates
    hypothesis: C. elegans PINK-1 phosphorylates ubiquitin and PDR-1 at 
      conserved Ser65 positions
  - description: Phosphoproteomics in pink-1 mutants to identify 
      PINK-1-dependent phosphorylation events
    hypothesis: PINK-1 has additional substrates beyond ubiquitin and Parkin
  - description: Tissue-specific rescue experiments to determine cell-autonomous
      vs non-autonomous functions
    hypothesis: PINK-1 function in neurons is cell-autonomous for mitophagy and 
      stress response
tags:
  - caeel-mitophagy

pink-1

Gene Description

Existing Annotations Review

Core Functions

PINK-1 is a serine/threonine kinase that phosphorylates ubiquitin (Ser65) and Parkin/PDR-1 (Ser65) to activate the mitophagic cascade at the outer mitochondrial membrane. Loss of pink-1 eliminates stress-induced autophagic responses and prevents clearance of damaged mitochondria.

PINK-1 phosphorylates ubiquitin and Parkin to activate Parkin's E3 ligase activity, promoting ubiquitination of outer mitochondrial membrane proteins as part of the mitophagy initiation cascade.

pink-1 mutants are hypersensitive to paraquat-induced oxidative stress. PINK-1-dependent clearance of damaged mitochondria (which produce ROS) is protective against oxidative damage.

References

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Thinking Trace

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Thinking Trace

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Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

Target Gene/Protein Identity (from UniProt):

MANDATORY VERIFICATION STEPS:

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

Research Target:

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Bioreason Rl Review

BioReason-Pro RL Review: pink-1 (C. elegans)

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