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PLCG1 (UniProt: P19174) encodes phospholipase C-gamma-1 (PLCγ1), also known as 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase gamma-1 (EC 3.1.4.11), in humans. This protein belongs to the phospholipase C family of signaling enzymes and is widely expressed across tissues (joel2020dynamicsofallosteric pages 28-32).
PLCγ1 is a phosphoinositide-specific phospholipase that catalyzes the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2), a phospholipid located at the inner leaflet of the plasma membrane (siralievperez2022dynamicsofallosteric pages 1-3, joel2020dynamicsofallosteric pages 12-19). The catalytic reaction cleaves the phosphodiester bond between the inositol head group and the glycerol backbone of PIP2, proceeding through a cyclic phosphate intermediate before generating the final products (singh2023phospholipasecunderrated pages 2-3).
This enzymatic reaction produces two critical second messengers that propagate distinct signaling pathways: inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG) (duarte2023multiplerolesof pages 22-26, siralievperez2022dynamicsofallosteric pages 1-3). IP3 is a soluble messenger that diffuses through the cytosol to bind IP3 receptors on the endoplasmic reticulum, triggering the release of stored Ca²⁺ into the cytoplasm and initiating calcium-dependent signaling cascades (chen2021emergingrolesof pages 9-11, joel2020dynamicsofallosteric pages 12-19). DAG, being hydrophobic, remains embedded in the plasma membrane where it recruits and activates conventional protein kinase C (PKC) isoforms, particularly in conjunction with the elevated calcium signal (joel2020dynamicsofallosteric pages 12-19, kanemaru2023activationmechanismsand pages 1-2, singh2023phospholipasecunderrated pages 2-3). Together, these products link receptor activation to coordinated calcium mobilization and PKC-dependent phosphorylation pathways (duarte2023multiplerolesof pages 26-30).
PLCγ1 possesses a complex modular architecture that distinguishes it from other phospholipase C family members. The protein contains a conserved catalytic core comprising an N-terminal pleckstrin homology (PH) domain, four EF-hand motifs, catalytic X and Y domains that form a TIM-barrel-like structure, and a C-terminal C2 domain (chen2021emergingrolesof pages 19-22, singh2023phospholipasecunderrated pages 3-5, singh2023phospholipasecunderrated pages 2-3).
The defining feature of PLCγ1 is a large regulatory insertion, termed the γ-specific array (γSA), located between the X and Y catalytic domains (duarte2023multiplerolesof pages 26-30). This insertion contains a split PH (sPH) domain flanking tandem Src homology 2 (SH2) domains—designated nSH2 and cSH2—followed by an SH3 domain (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 24-28, chen2021emergingrolesof pages 19-22). Each regulatory domain serves distinct functions in PLCγ1 regulation and signaling:
| Domain | Location in PLCγ1 | Key structural features | Primary function in regulation and signaling |
|---|---|---|---|
| Pleckstrin homology (PH) domain | N-terminal region, before the EF hands and catalytic core | Conserved PLC-core module with phosphoinositide- and membrane-interacting properties | Supports membrane targeting and interaction with phosphoinositides, helping position PLCγ1 near membrane-embedded PI(4,5)P₂; distinct from the split PH domain in the γ-specific insert. (singh2023phospholipasecunderrated pages 3-5, singh2023phospholipasecunderrated pages 2-3) |
| EF-hand motifs | Between the N-terminal PH domain and catalytic X region | Four EF-hand repeats arranged as paired helix–loop–helix modules; part of the conserved PLC core | Contribute to catalytic-core architecture and Ca²⁺-responsive regulation; Ca²⁺-dependent conformational changes can stabilize or expose interaction surfaces. (singh2023phospholipasecunderrated pages 3-5, joel2020dynamicsofallosteric pages 36-41) |
| X catalytic domain | First half of the catalytic core; precedes the γ-specific regulatory insertion | Combines with the Y region to form a TIM-barrel-like catalytic structure; contains conserved catalytic residues, including functionally important histidines | Participates directly in phosphodiester-bond cleavage during PI(4,5)P₂ hydrolysis and cyclic inositol-phosphate intermediate formation. (mariano2024intronretentionin pages 8-8, singh2023phospholipasecunderrated pages 2-3) |
| Split PH (sPH) domain | Two discontinuous segments flanking the SH2–SH2–SH3 modules within the insertion between X and Y | Reassembles into a stable PH-like fold; lies over the catalytic TIM barrel in the inactive structure and forms part of the γ-specific array | Helps maintain autoinhibition by obstructing catalytic-core access to the membrane; also mediates regulatory interactions, including coupling to TRPC3 and reported small-GTPase binding. (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 24-28) |
| N-terminal SH2 (nSH2) domain | Within the γ-specific insertion, after the N-terminal portion of the sPH domain | Phosphotyrosine-recognition module exposed for receptor engagement | Recruits cytosolic PLCγ1 to phosphorylated receptor tyrosine kinases or adaptor proteins, positioning it for Tyr783 phosphorylation and membrane-proximal activation; also participates in LAT binding in T-cell signaling. (joel2020dynamicsofallosteric pages 24-28, zeng2020plcγ1promotesphase pages 11-15) |
| C-terminal SH2 (cSH2) domain | Within the γ-specific insertion, immediately following nSH2 | Phosphotyrosine-binding module whose electropositive loops contact the catalytic-core C2 domain in resting PLCγ1 | Principal autoinhibitory switch: clasps the C2 domain in the closed state; after Tyr783 phosphorylation, intramolecular pTyr783 binding displaces these contacts and promotes catalytic-core exposure. It can also contribute to phosphotyrosine-dependent signal-complex assembly. (joel2020dynamicsofallosteric pages 24-28, joel2020dynamicsofallosteric pages 28-32) |
| SH3 domain | Within the γ-specific insertion, after the tandem SH2 domains and before the C-terminal sPH segment | Proline-rich-sequence-binding module that helps stabilize the regulatory-domain arrangement | Provides noncatalytic scaffolding by binding proteins such as SLP-76, Vav1, SOS and dynamin; supports LAT signalosome organization and can help stabilize the autoinhibited γ-specific array. (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 28-32, joel2020dynamicsofallosteric pages 24-28) |
| Y catalytic domain | Second half of the catalytic core; follows the γ-specific insertion | Completes the TIM-barrel-like active site with the X region and contributes to substrate-recognition surfaces | Cooperates with the X domain to recognize and hydrolyze membrane PI(4,5)P₂, generating IP₃ and diacylglycerol after autoinhibition is relieved. (singh2023phospholipasecunderrated pages 3-5, mariano2024intronretentionin pages 8-8, singh2023phospholipasecunderrated pages 2-3) |
| C2 domain | C-terminal portion of the conserved catalytic core, after the Y region | β-sandwich module; provides membrane- and protein-interaction surfaces and forms a major interface with cSH2 in inactive PLCγ1 | Contributes to membrane engagement and catalytic-core organization; in the resting enzyme, its interaction with cSH2 stabilizes autoinhibition, whereas disruption of that interface permits productive membrane binding and catalysis. (duarte2023multiplerolesof pages 26-30, singh2023phospholipasecunderrated pages 3-5, joel2020dynamicsofallosteric pages 96-99, joel2020dynamicsofallosteric pages 28-32) |
Table: This table maps the principal catalytic and regulatory domains of human PLCγ1 and summarizes how each contributes to membrane recruitment, autoinhibition, activation, catalysis, or signaling-complex assembly.
The nSH2 domain mediates recruitment of cytosolic PLCγ1 to phosphorylated receptor tyrosine kinases (RTKs) and adaptor proteins such as LAT in T-cell signaling (joel2020dynamicsofallosteric pages 24-28, zeng2020plcγ1promotesphase pages 11-15). The cSH2 domain functions as the principal autoinhibitory element, maintaining PLCγ1 in an inactive state through interactions with the catalytic core (joel2020dynamicsofallosteric pages 24-28). The SH3 domain provides scaffolding functions, binding proline-rich sequences in proteins including SLP-76, Vav1, and SOS (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 28-32).
In resting cells, PLCγ1 exists in an autoinhibited conformation maintained by intramolecular interactions between the regulatory domains and the catalytic core (joel2020dynamicsofallosteric pages 96-99, joel2020dynamicsofallosteric pages 28-32). The cSH2 domain plays a critical role by clasping the C2 domain through electrostatic contacts, burying the cSH2 phosphotyrosine-binding surface and preventing productive activation (joel2020dynamicsofallosteric pages 28-32, joel2020dynamicsofallosteric pages 24-28). Additionally, the split PH domain lies directly over the catalytic TIM barrel, sterically blocking access to the active site and preventing membrane engagement (joel2020dynamicsofallosteric pages 24-28, siralievperez2022dynamicsofallosteric pages 11-12). This regulatory architecture ensures that PLCγ1 cannot access its membrane-embedded PIP2 substrate in the absence of appropriate upstream signals (joel2020dynamicsofallosteric pages 76-80, siralievperez2022dynamicsofallosteric pages 1-3).
Unlike other PLC isoforms, PLCγ1 requires tyrosine phosphorylation for activation (joel2020dynamicsofallosteric pages 71-76, joel2020dynamicsofallosteric pages 124-128). The activation process follows a coordinated sequence initiated by receptor stimulation. Upon ligand binding, receptor tyrosine kinases such as EGFR, VEGFR, FGFR, and PDGFR undergo dimerization and autophosphorylation, creating phosphotyrosine docking sites (joel2020dynamicsofallosteric pages 24-28, duarte2023multiplerolesof pages 26-30, chen2021emergingrolesof pages 8-9). The nSH2 domain of PLCγ1 recognizes these phosphorylated receptor sites and recruits the enzyme from the cytoplasm to the plasma membrane, positioning it near active kinases and membrane-embedded substrate (joel2020dynamicsofallosteric pages 24-28, joel2020dynamicsofallosteric pages 28-32).
Following membrane recruitment, receptor-associated kinases phosphorylate PLCγ1 at multiple regulatory tyrosines, most critically at Tyr783 (joel2020dynamicsofallosteric pages 24-28, siralievperez2022dynamicsofallosteric pages 1-3). Phosphorylation of Tyr783 is essential for lipase activation: the phosphorylated tyrosine binds intramolecularly to the cSH2 domain, disrupting its inhibitory interaction with the C2 domain and triggering a conformational rearrangement that exposes the catalytic core (joel2020dynamicsofallosteric pages 28-32, duarte2023multiplerolesof pages 26-30). This release from autoinhibition allows the catalytic domains to productively engage the membrane and hydrolyze PIP2 (siralievperez2022dynamicsofallosteric pages 1-3).
Recent structural studies using hydrogen-deuterium exchange mass spectrometry (HDX-MS) have revealed that receptor engagement also allosterically primes PLCγ1 for activation (siralievperez2022dynamicsofallosteric pages 1-3). Binding to the FGFR1 kinase domain shifts PLCγ1 toward an activation-competent conformational state even before complete phosphorylation, demonstrating cooperativity between receptor engagement, phosphorylation, and membrane proximity in promoting full activation (siralievperez2022dynamicsofallosteric pages 1-3).
PLCγ1 exhibits dynamic subcellular localization that is tightly coupled to its activation state. In the resting, autoinhibited state, PLCγ1 resides primarily in the cytoplasm, sequestered from its membrane-associated substrate (duarte2023multiplerolesof pages 26-30, kanemaru2023activationmechanismsand pages 4-6, joel2020dynamicsofallosteric pages 28-32). The regulatory domain architecture prevents spontaneous membrane association and maintains the enzyme in a soluble, inactive form (joel2020dynamicsofallosteric pages 124-128).
Upon receptor activation, PLCγ1 is actively recruited to the plasma membrane through SH2-domain-mediated interactions with phosphorylated receptors (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 28-32). The plasma membrane serves as the principal functional site where activated PLCγ1 hydrolyzes PIP2 to generate IP3 and DAG (chen2021emergingrolesof pages 1-3, joel2020dynamicsofallosteric pages 12-19). Following activation and signaling, PLCγ1 can dissociate from receptors and return to the cytosol in its autoinhibited conformation (duarte2023multiplerolesof pages 26-30).
Beyond plasma membrane signaling, PLCγ1 has been reported to function in additional cellular compartments. The SH3 domain mediates interactions with dynamin-1 during receptor endocytosis, suggesting roles at endocytic membrane compartments (chen2021emergingrolesof pages 1-3, chen2021emergingrolesof pages 13-14). Nuclear functions have also been described, including interaction with the nuclear GTPase PIKE and potential roles in nuclear phosphoinositide signaling, although the plasma membrane remains the best-characterized site of PLCγ1 catalytic activity (chen2021emergingrolesof pages 1-3, chen2021emergingrolesof pages 9-11, chen2021emergingrolesof pages 13-14).
PLCγ1 functions as a critical node linking extracellular receptor activation to multiple intracellular signaling pathways. Its versatile domain architecture enables both catalytic lipase activity and noncatalytic scaffolding functions that organize signaling complexes.
| Pathway name | Upstream activators (receptors/kinases) | PLCG1 activation mechanism | Downstream effectors | Biological outcomes |
|---|---|---|---|---|
| Receptor tyrosine kinase signaling | EGFR, VEGFR1/2, FGFR1, PDGFR and Trk receptors; receptor-associated tyrosine kinases | Ligand-induced receptor autophosphorylation creates phosphotyrosine docking sites for PLCγ1 SH2 domains. Membrane recruitment, receptor engagement and phosphorylation—especially at Tyr783—disrupt cSH2–C2 autoinhibitory contacts, expose membrane-binding surfaces and permit hydrolysis of PI(4,5)P2 (PIP2). (joel2020dynamicsofallosteric pages 24-28, siralievperez2022dynamicsofallosteric pages 1-3, chen2021emergingrolesof pages 8-9) | IP3–IP3 receptor–Ca²⁺ signaling; DAG–PKC; Raf–MEK–ERK; context-dependent CaMK and CREB signaling | Growth-factor responses including proliferation, differentiation, survival and migration; VEGFR2–PLCγ1 signaling is particularly important for endothelial sprouting, vascular development and permeability. (joel2020dynamicsofallosteric pages 32-36, chen2021emergingrolesof pages 8-9, chen2021emergingrolesof pages 9-11) |
| T-cell receptor signaling | TCR–CD3 complex; Lck and ZAP-70; phosphorylated LAT; SLP-76/GADS signalosome; ITK | TCR ligation triggers ITAM phosphorylation and ZAP-70-dependent LAT phosphorylation. PLCγ1 binds phosphorylated LAT, participates in multivalent LAT–SLP-76 signaling assemblies, and is phosphorylated by ITK at Tyr783, relieving autoinhibition and activating PIP2 hydrolysis. Its SH2/SH3 modules also crosslink and stabilize LAT clusters and protect LAT phosphosites from CD45-mediated dephosphorylation. (zeng2020plcγ1promotesphase pages 15-22, zeng2020plcγ1promotesphase pages 11-15, joel2020dynamicsofallosteric pages 32-36, joel2020dynamicsofallosteric pages 28-32) | IP3–Ca²⁺–calcineurin–NFAT; DAG–PKCθ–NF-κB; DAG–RasGRP–Ras–ERK–AP-1; SLP-76 and LAT microcluster signaling | Thymocyte development and selection, mature T-cell activation, proliferation, cytokine production and regulatory T-cell development/function; excessive activation contributes to T-cell lymphomagenesis. (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 32-36) |
| Calcium–calcineurin–NFAT signaling | PLCγ1-activating RTKs or antigen receptors; IP3 receptors on the endoplasmic reticulum; store-operated Ca²⁺-entry machinery | Activated PLCγ1 cleaves plasma-membrane PIP2 into soluble IP3 and membrane-retained DAG. IP3 opens ER IP3-receptor channels; ER-store depletion promotes sustained extracellular Ca²⁺ entry. (chen2021emergingrolesof pages 1-3, chen2021emergingrolesof pages 9-11, kanemaru2023activationmechanismsand pages 1-2) | Cytosolic Ca²⁺, calmodulin, calcineurin and NFAT; Ca²⁺ plus DAG also activates conventional PKC isoforms, while DAG can activate TRPC3/6/7 channels. (chen2021emergingrolesof pages 9-11, kanemaru2023activationmechanismsand pages 1-2) | Nuclear NFAT-dependent transcription; receptor- and cell-context-dependent control of immune activation, endothelial proliferation and migration, angiogenic sprouting and vascular permeability. (chen2021emergingrolesof pages 9-11) |
Table: This table maps major PLCG1 pathways from receptor-proximal activation through IP3/DAG effectors to biological outcomes. It highlights the shared Tyr783-dependent activation mechanism and pathway-specific roles in growth-factor, T-cell and calcium/NFAT signaling.
PLCγ1 serves as a direct effector downstream of multiple RTK families, including EGFR, VEGFR1/2, FGFR1, PDGFR, and Trk receptors (duarte2023multiplerolesof pages 26-30, chen2021emergingrolesof pages 8-9, joel2020dynamicsofallosteric pages 32-36). In VEGFR2 signaling, particularly important in endothelial cells, PLCγ1 binds to phosphorylated Tyr1175 and mediates calcium mobilization and PKC activation (chen2021emergingrolesof pages 8-9). The resulting Ca²⁺-calcineurin-NFAT pathway drives endothelial proliferation, migration, angiogenic sprouting, and vascular permeability (chen2021emergingrolesof pages 9-11). DAG produced by PLCγ1 activates PKCβ, which contributes to VEGFR2-dependent Raf/MEK/ERK signaling and endothelial function (chen2021emergingrolesof pages 9-11).
In FGFR1 signaling, PLCγ1 is recruited through its cSH2 domain to phosphorylated Tyr766 and provides an additive contribution to ERK activation alongside the primary Frs2α-Grb2-SOS-Ras-MAPK cascade (chen2021emergingrolesof pages 8-9). The DAG produced by PLCγ1 can also generate intracellular gradients that regulate cytoskeletal dynamics and cell migration (joel2020dynamicsofallosteric pages 32-36).
PLCγ1 plays an essential, nonredundant role in T-cell development and function (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 32-36). Upon TCR engagement, the Src-family kinase Lck phosphorylates immunoreceptor tyrosine-based activation motifs (ITAMs) on CD3 and ζ-chain components, recruiting ZAP-70 kinase (joel2020dynamicsofallosteric pages 32-36). ZAP-70 then phosphorylates the adaptor protein LAT, creating docking sites for PLCγ1's SH2 domains (zeng2020plcγ1promotesphase pages 11-15, joel2020dynamicsofallosteric pages 32-36).
Recent studies have revealed that PLCγ1 functions not merely as a downstream effector but as an active organizer of TCR signaling complexes (zeng2020plcγ1promotesphase pages 15-22, zeng2020plcγ1promotesphase pages 44-48, zeng2020plcγ1promotesphase pages 11-15, zeng2020plcγ1promotesphase pages 1-6). PLCγ1 directly crosslinks phosphorylated LAT molecules through its tandem SH2 domains, with nSH2 binding LAT Tyr132 and cSH2 engaging Tyr171 (zeng2020plcγ1promotesphase pages 11-15). This multivalent binding promotes LAT microcluster formation and phase separation of signaling condensates at the plasma membrane (zeng2020plcγ1promotesphase pages 15-22, zeng2020plcγ1promotesphase pages 1-6). PLCγ1 also protects LAT phosphorylation sites from dephosphorylation by the phosphatase CD45, thereby stabilizing the signaling complex (zeng2020plcγ1promotesphase pages 15-22, zeng2020plcγ1promotesphase pages 11-15).
The SH3 domain of PLCγ1 scaffolds additional signaling proteins, including SLP-76, which is required for PLCγ1 activation by the Tec-family kinase ITK (zeng2020plcγ1promotesphase pages 44-48, joel2020dynamicsofallosteric pages 28-32). Following ITK-mediated phosphorylation at Tyr783, activated PLCγ1 generates IP3 and DAG, initiating multiple downstream pathways: IP3-Ca²⁺-calcineurin-NFAT, DAG-PKCθ-NF-κB, and DAG-RasGRP-Ras-ERK-AP-1 (duarte2023multiplerolesof pages 26-30, joel2020dynamicsofallosteric pages 32-36). These pathways collectively drive the transcriptional programs required for thymocyte maturation, positive and negative selection, and mature T-cell activation, proliferation, and cytokine production (joel2020dynamicsofallosteric pages 32-36, duarte2023multiplerolesof pages 26-30).
Genetic studies confirm PLCγ1's critical role: T-cell-specific deletion impairs thymocyte development, TCR-induced responses, and regulatory T-cell function (duarte2023multiplerolesof pages 26-30). Conversely, gain-of-function mutations that disrupt autoinhibition drive excessive signaling and contribute to T-cell lymphomagenesis (duarte2023multiplerolesof pages 26-30).
The IP3 generated by activated PLCγ1 serves as the primary trigger for intracellular calcium signaling (chen2021emergingrolesof pages 1-3, chen2021emergingrolesof pages 9-11, kanemaru2023activationmechanismsand pages 1-2). IP3 opens ER-localized IP3 receptor channels, releasing stored Ca²⁺ into the cytosol (chen2021emergingrolesof pages 9-11, kanemaru2023activationmechanismsand pages 1-2). This initial ER-mediated calcium release can be sustained through store-operated calcium entry (SOCE) and other plasma membrane calcium channels (chen2021emergingrolesof pages 9-11).
The resulting elevation in cytosolic Ca²⁺ activates calmodulin and the calcium-dependent phosphatase calcineurin (chen2021emergingrolesof pages 9-11). Calcineurin dephosphorylates the transcription factor NFAT, enabling its nuclear translocation and transcriptional activation (chen2021emergingrolesof pages 9-11). This Ca²⁺-calcineurin-NFAT pathway is critical in both immune and endothelial contexts, regulating T-cell activation, endothelial proliferation and migration, and angiogenic responses (chen2021emergingrolesof pages 9-11).
PLCγ1's split PH domain also directly couples to calcium signaling through interaction with TRPC3 channels, further linking PLCγ1 to agonist-induced calcium entry (duarte2023multiplerolesof pages 26-30). Additionally, DAG can activate TRPC3/6/7 channels, which are calcium-permeable and amplify the calcium signal (kanemaru2023activationmechanismsand pages 1-2, kanemaru2023activationmechanismsand pages 2-4).
The understanding of PLCγ1 function is supported by diverse experimental approaches. Crystal structures and cryo-electron microscopy have revealed the autoinhibitory architecture, showing how the cSH2 domain clasps the C2 domain and the split PH domain occludes the catalytic site in the inactive state (joel2020dynamicsofallosteric pages 96-99, joel2020dynamicsofallosteric pages 28-32, joel2020dynamicsofallosteric pages 24-28). These structural studies have been complemented by hydrogen-deuterium exchange mass spectrometry (HDX-MS), which demonstrated that PLCγ1 undergoes extensive conformational changes upon receptor binding, shifting toward an activation-competent ensemble (siralievperez2022dynamicsofallosteric pages 1-3).
Reconstituted membrane systems have been instrumental in defining activation requirements (siralievperez2022dynamicsofallosteric pages 1-3, zeng2020plcγ1promotesphase pages 15-22). These studies showed that PLCγ1 is relatively inert toward PIP2-containing vesicles unless first engaged by receptor kinase domains, demonstrating the importance of receptor priming (siralievperez2022dynamicsofallosteric pages 1-3). Live-cell and reconstituted membrane experiments have also revealed PLCγ1's role in promoting phase separation of LAT signaling condensates, establishing a structural function beyond catalytic activity (zeng2020plcγ1promotesphase pages 15-22, zeng2020plcγ1promotesphase pages 1-6).
Phosphorylation studies using site-directed mutagenesis have confirmed Tyr783 as the critical regulatory site: mutation to phenylalanine prevents activation, while phosphomimetic substitutions or mutations disrupting cSH2-C2 interactions cause constitutive activation (joel2020dynamicsofallosteric pages 24-28, siralievperez2022dynamicsofallosteric pages 1-3). Disease-associated mutations that disrupt autoinhibitory interfaces similarly result in hyperactive PLCγ1 and drive pathological signaling in immune disorders and cancer (joel2020dynamicsofallosteric pages 96-99).
PLCG1 encodes a sophisticated signaling enzyme that couples receptor activation to coordinated calcium and lipid signaling. Through its unique domain architecture, PLCγ1 integrates tyrosine kinase signals, organizes signaling complexes, and catalyzes PIP2 hydrolysis to generate IP3 and DAG. These second messengers activate distinct but complementary pathways—IP3-mediated ER calcium release and DAG-dependent PKC activation—that drive diverse cellular responses including T-cell activation, vascular development, cell proliferation, and migration. The enzyme's regulation through autoinhibition and phosphorylation-dependent activation ensures precise spatiotemporal control of these critical signaling events.
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(chen2021emergingrolesof pages 1-3): Dongying Chen and Michael Simons. Emerging roles of plcγ1 in endothelial biology. Science Signaling, Aug 2021. URL: https://doi.org/10.1126/scisignal.abc6612, doi:10.1126/scisignal.abc6612. This article has 51 citations and is from a domain leading peer-reviewed journal.
(chen2021emergingrolesof pages 13-14): Dongying Chen and Michael Simons. Emerging roles of plcγ1 in endothelial biology. Science Signaling, Aug 2021. URL: https://doi.org/10.1126/scisignal.abc6612, doi:10.1126/scisignal.abc6612. This article has 51 citations and is from a domain leading peer-reviewed journal.
(joel2020dynamicsofallosteric pages 32-36): Dynamics of allosteric regulation of the phospholipase C-gamma isozymes This article has 0 citations and is from a peer-reviewed journal.
(zeng2020plcγ1promotesphase pages 15-22): Longhui Zeng, Ivan Palaia, Anđela Šarić, and Xiaolei Su. Plcγ1 promotes phase separation of the t cell signaling clusters. bioRxiv, Jul 2020. URL: https://doi.org/10.1101/2020.06.30.179630, doi:10.1101/2020.06.30.179630. This article has 2 citations.
(zeng2020plcγ1promotesphase pages 44-48): Longhui Zeng, Ivan Palaia, Anđela Šarić, and Xiaolei Su. Plcγ1 promotes phase separation of the t cell signaling clusters. bioRxiv, Jul 2020. URL: https://doi.org/10.1101/2020.06.30.179630, doi:10.1101/2020.06.30.179630. This article has 2 citations.
(zeng2020plcγ1promotesphase pages 1-6): Longhui Zeng, Ivan Palaia, Anđela Šarić, and Xiaolei Su. Plcγ1 promotes phase separation of the t cell signaling clusters. bioRxiv, Jul 2020. URL: https://doi.org/10.1101/2020.06.30.179630, doi:10.1101/2020.06.30.179630. This article has 2 citations.
(kanemaru2023activationmechanismsand pages 2-4): Kaori Kanemaru and Yoshikazu Nakamura. Activation mechanisms and diverse functions of mammalian phospholipase c. Biomolecules, 13:915, May 2023. URL: https://doi.org/10.3390/biom13060915, doi:10.3390/biom13060915. This article has 56 citations.