MGP Database

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MGP002426

UniProt Annotations

Entry Information
Gene Nameprotein kinase C, eta
Protein EntryKPCL_HUMAN
UniProt IDP24723
SpeciesHuman
Comments
Comment typeDescription
Alternative ProductsEvent=Alternative splicing; Named isoforms=2; Name=1; IsoId=P24723-1; Sequence=Displayed; Name=2; IsoId=P24723-2; Sequence=VSP_056572; Note=No experimental confirmation available.;
Catalytic ActivityATP + a protein = ADP + a phosphoprotein.
DiseaseIschemic stroke (ISCHSTR) [MIM:601367]: A stroke is an acute neurologic event leading to death of neural tissue of the brain and resulting in loss of motor, sensory and/or cognitive function. Ischemic strokes, resulting from vascular occlusion, is considered to be a highly complex disease consisting of a group of heterogeneous disorders with multiple genetic and environmental risk factors. {ECO:0000269|PubMed:17206144}. Note=Disease susceptibility is associated with variations affecting the gene represented in this entry.
DomainThe C1 domain, containing the phorbol ester/DAG-type region 1 (C1A) and 2 (C1B), is the diacylglycerol sensor and the C2 domain is a non-calcium binding domain.
Enzyme RegulationNovel PKCs (PRKCD, PRKCE, PRKCH and PRKCQ) are calcium-insensitive, but activated by diacylglycerol (DAG) and phosphatidylserine. Three specific sites; Thr-513 (activation loop of the kinase domain), Thr-656 (turn motif) and Ser-675 (hydrophobic region), need to be phosphorylated for its full activation.
FunctionCalcium-independent, phospholipid- and diacylglycerol (DAG)-dependent serine/threonine-protein kinase that is involved in the regulation of cell differentiation in keratinocytes and pre-B cell receptor, mediates regulation of epithelial tight junction integrity and foam cell formation, and is required for glioblastoma proliferation and apoptosis prevention in MCF-7 cells. In keratinocytes, binds and activates the tyrosine kinase FYN, which in turn blocks epidermal growth factor receptor (EGFR) signaling and leads to keratinocyte growth arrest and differentiation. Associates with the cyclin CCNE1-CDK2-CDKN1B complex and inhibits CDK2 kinase activity, leading to RB1 dephosphorylation and thereby G1 arrest in keratinocytes. In association with RALA activates actin depolymerization, which is necessary for keratinocyte differentiation. In the pre-B cell receptor signaling, functions downstream of BLNK by up-regulating IRF4, which in turn activates L chain gene rearrangement. Regulates epithelial tight junctions (TJs) by phosphorylating occludin (OCLN) on threonine residues, which is necessary for the assembly and maintenance of TJs. In association with PLD2 and via TLR4 signaling, is involved in lipopolysaccharide (LPS)-induced RGS2 down-regulation and foam cell formation. Upon PMA stimulation, mediates glioblastoma cell proliferation by activating the mTOR pathway, the PI3K/AKT pathway and the ERK1- dependent phosphorylation of ELK1. Involved in the protection of glioblastoma cells from irradiation-induced apoptosis by preventing caspase-9 activation. In camptothecin-treated MCF-7 cells, regulates NF-kappa-B upstream signaling by activating IKBKB, and confers protection against DNA damage-induced apoptosis. Promotes oncogenic functions of ATF2 in the nucleus while blocking its apoptotic function at mitochondria. Phosphorylates ATF2 which promotes its nuclear retention and transcriptional activity and negatively regulates its mitochondrial localization. {ECO:0000269|PubMed:10806212, ECO:0000269|PubMed:11112424, ECO:0000269|PubMed:11772428, ECO:0000269|PubMed:15489897, ECO:0000269|PubMed:17146445, ECO:0000269|PubMed:18780722, ECO:0000269|PubMed:19114660, ECO:0000269|PubMed:20558593, ECO:0000269|PubMed:21820409, ECO:0000269|PubMed:22304920}.
SimilarityBelongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family. PKC subfamily. {ECO:0000305}.
SimilarityContains 1 AGC-kinase C-terminal domain. {ECO:0000305}.
SimilarityContains 1 C2 domain. {ECO:0000255|PROSITE- ProRule:PRU00041}.
SimilarityContains 1 protein kinase domain. {ECO:0000255|PROSITE-ProRule:PRU00159}.
SimilarityContains 2 phorbol-ester/DAG-type zinc fingers. {ECO:0000255|PROSITE-ProRule:PRU00226}.
Subcellular LocationCytoplasm {ECO:0000250}.
SubunitInteracts with FYN and RALA (By similarity). Interacts with DGKQ. {ECO:0000250, ECO:0000269|PubMed:15632189}.
Tissue SpecificityMost abundant in lung, less in heart and skin. {ECO:0000269|PubMed:1986216}.
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