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JNK1 a protein kinase of the MAPK family that is potently activated by a variety of environmental stresses, including UV and gamma radiation, ceramides, pro-inflammatory cytokines and, in some instances, by growth factors and GPCR agonists. Substrates include a number of transcription factors, primarily components of AP-1 such as c-Jun and ATF2, thus regulating AP-1 transcriptional activity. In T- cells, JNK1 and JNK2 are required for polarized differentiation of T-helper cells into Th1 cells. Binds to at least four scaffolding proteins, JIP-1, -2, -3 and -4. Activity increased in obesity. Inhibition or mouse knockout increases insulin sensitivity. Part of NFB pathway involved in inflammation and cancer, and signals downstream of Ras, though possibly as an apoptotic negative regulator of growth. Four alternatively-spliced isoforms have been described. Note: This description may include information from UniProtKB.
Protein type: CMGC group; EC; JNK subfamily; Kinase, protein; MAPK family; MAPK/JNK subfamily; Protein kinase, CMGC; Protein kinase, Ser/Thr (non-receptor)
Chromosomal Location of Human Ortholog: 10q11.22
Cellular Component: cytoplasm; cytosol; neuron projection; nucleoplasm; nucleus
Molecular Function: enzyme binding; histone deacetylase binding; histone deacetylase regulator activity; JUN kinase activity; kinase activity; protein binding; protein serine/threonine kinase activity
Biological Process: cellular response to amino acid starvation; JNK cascade; JUN phosphorylation; negative regulation of apoptosis; negative regulation of protein binding; neuron development; peptidyl-serine phosphorylation; peptidyl-threonine phosphorylation; positive regulation of apoptosis; positive regulation of cyclase activity; positive regulation of protein metabolic process; protein amino acid phosphorylation; regulation of circadian rhythm; regulation of macroautophagy; regulation of protein localization; regulation of transcription factor activity; response to stress; response to UV; stress-activated MAPK cascade
Reference #:  P45983 (UniProtKB)
Alt. Names/Synonyms: c-Jun N-terminal kinase 1; JNK; JNK-46; JNK1; JNK1 alpha protein kinase; JNK1 beta protein kinase; JNK1A2; JNK21B1/2; JUN N-terminal kinase; MAP kinase 8; MAPK 8; MAPK8; Mitogen-activated protein kinase 8; mitogen-activated protein kinase 8 isoform JNK1 alpha1; mitogen-activated protein kinase 8 isoform JNK1 beta2; MK08; PRKM8; protein kinase JNK1; SAPK1; Stress-activated protein kinase 1; Stress-activated protein kinase JNK1
Gene Symbols: MAPK8
Molecular weight: 48,296 Da
Basal Isoelectric point: 6.43  Predict pI for various phosphorylation states
CST Pathways:  Apoptosis Regulation  |  B Cell Receptor Signaling  |  Death Receptor Signaling  |  ErbB/HER Signaling  |  Inhibition of Apoptosis  |  Insulin Receptor Signaling  |  Mitochondrial Control of Apoptosis  |  NF-kB Signaling  |  Parkinson's Disease  |  SAPK/JNK Signaling Cascades  |  T Cell Receptor Signaling  |  TGF-ß Signaling  |  Toll-Like Receptor Signaling
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