Janus kinase
From Proteopedia
FunctionJanus kinase or tyrosine-protein kinase JAK (JAK) are nonreceptor tyrosine kinases which transduces cytokine-mediated signals via the JAK-STAT pathway. The JAK-STAT pathway transmits signals through the cell membrane to DNA promoters thus causing transcription. The name JAK is derived from Just Another Kinase. JAK proteins contain 2 phosphate-transfer domains, one with kinase activity using a phosphotyrosine (PTyr) and the other a pseudokinase domain which negatively regulates the kinase domain. JAK contains seven Janus homology domains named JH1-7. JAK family members are JAK1, JAK2, JAK3 and TYK2[1]. See Tyrosine kinase. RelevanceJak3 inhibitors are tested in treatment of autoimmune diseases and transplant rejection[2]. DiseaseMutations in Jak2 are associated with chronic myeloproliferative neoplasms, polycythemia vera, essential thrombocytosis and primary myelofibrosis[3]. Mutations in Jak3 are associated with immune deficiency. Structural highlightsJak2 containing phosphotyrosine binds the thienopyridine potent inhibitor in the ATP-binding pocket[4]. Water molecules shown as red spheres. 3D Structures of Janus kinase
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References
- ↑ Liu KD, Gaffen SL, Goldsmith MA, Greene WC. Janus kinases in interleukin-2-mediated signaling: JAK1 and JAK3 are differentially regulated by tyrosine phosphorylation. Curr Biol. 1997 Nov 1;7(11):817-26. PMID:9382798
- ↑ O'Shea JJ, Kontzias A, Yamaoka K, Tanaka Y, Laurence A. Janus kinase inhibitors in autoimmune diseases. Ann Rheum Dis. 2013 Apr;72 Suppl 2:ii111-5. doi: 10.1136/annrheumdis-2012-202576. PMID:23532440 doi:http://dx.doi.org/10.1136/annrheumdis-2012-202576
- ↑ Levine RL. Janus kinase mutations. Semin Oncol. 2009 Apr;36(2 Suppl 1):S6-11. doi: 10.1053/j.seminoncol.2009.02.005. PMID:19393837 doi:http://dx.doi.org/10.1053/j.seminoncol.2009.02.005
- ↑ Schenkel LB, Huang X, Cheng A, Deak HL, Doherty E, Emkey R, Gu Y, Gunaydin H, Kim JL, Lee J, Loberg R, Olivieri P, Pistillo J, Tang J, Wan Q, Wang HL, Wang SW, Wells MC, Wu B, Yu V, Liu L, Geuns-Meyer S. Discovery of Potent and Highly Selective Thienopyridine Janus Kinase 2 Inhibitors. J Med Chem. 2011 Nov 16. PMID:22087750 doi:10.1021/jm200911r
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