Serine/threonine-protein kinase 4 is an enzyme that in humans is encoded by the STK4 gene.[5][6][7]
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The protein encoded by this gene is a cytoplasmic kinase that is structurally similar to the yeast Ste20p (sterile 20 protein) kinase, which acts upstream of the stress-induced mitogen-activated protein kinase (MAPK) cascade. The encoded protein can phosphorylate myelin basic protein and undergoes autophosphorylation. A caspase-cleaved fragment of the encoded protein has been shown to be capable of phosphorylating histone H2B. The particular phosphorylation catalyzed by this protein has been correlated with apoptosis, and it's possible that this protein induces the chromatin condensation observed in this process.[8]
STK4 has been shown to interact with PRKRIR.[9]
STK4 has also been shown to prevent, through Yap1 coactivator modulation, haematological tumor cell apoptosis.[10]
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- Creasy CL, Chernoff J (1995). "Cloning and characterization of a human protein kinase with homology to Ste20". J. Biol. Chem. 270 (37): 21695–700. doi:10.1074/jbc.270.37.21695. PMID 7665586.
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- Creasy CL, Chernoff J (1995). "Cloning and characterization of a member of the MST subfamily of Ste20-like kinases". Gene. 167 (1–2): 303–6. doi:10.1016/0378-1119(95)00653-2. PMID 8566796.
- Creasy CL, Ambrose DM, Chernoff J (1996). "The Ste20-like protein kinase, Mst1, dimerizes and contains an inhibitory domain". J. Biol. Chem. 271 (35): 21049–53. doi:10.1074/jbc.271.35.21049. PMID 8702870.
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- Lee KK, Ohyama T, Yajima N, Tsubuki S, Yonehara S (2001). "MST, a physiological caspase substrate, highly sensitizes apoptosis both upstream and downstream of caspase activation". J. Biol. Chem. 276 (22): 19276–85. doi:10.1074/jbc.M005109200. PMID 11278283.
- Graves JD, Draves KE, Gotoh Y, Krebs EG, Clark EA (2001). "Both phosphorylation and caspase-mediated cleavage contribute to regulation of the Ste20-like protein kinase Mst1 during CD95/Fas-induced apoptosis". J. Biol. Chem. 276 (18): 14909–15. doi:10.1074/jbc.M010905200. PMID 11278782.
- Lee KK, Yonehara S (2002). "Phosphorylation and dimerization regulate nucleocytoplasmic shuttling of mammalian STE20-like kinase (MST)". J. Biol. Chem. 277 (14): 12351–8. doi:10.1074/jbc.M108138200. PMID 11805089.
- Khokhlatchev A, Rabizadeh S, Xavier R, Nedwidek M, Chen T, Zhang XF, Seed B, Avruch J (2002). "Identification of a novel Ras-regulated proapoptotic pathway". Curr. Biol. 12 (4): 253–65. doi:10.1016/S0960-9822(02)00683-8. PMID 11864565. S2CID 14053233.
- De Souza PM, Kankaanranta H, Michael A, Barnes PJ, Giembycz MA, Lindsay MA (2002). "Caspase-catalyzed cleavage and activation of Mst1 correlates with eosinophil but not neutrophil apoptosis". Blood. 99 (9): 3432–8. doi:10.1182/blood.V99.9.3432. PMID 11964314.
- Glantschnig H, Rodan GA, Reszka AA (2002). "Mapping of MST1 kinase sites of phosphorylation. Activation and autophosphorylation". J. Biol. Chem. 277 (45): 42987–96. doi:10.1074/jbc.M208538200. PMID 12223493.
- Lin Y, Khokhlatchev A, Figeys D, Avruch J (2002). "Death-associated protein 4 binds MST1 and augments MST1-induced apoptosis". J. Biol. Chem. 277 (50): 47991–8001. doi:10.1074/jbc.M202630200. PMID 12384512.