Janus kinase 3

Janus kinase 3

PDB rendering based on 1yvj.
Identifiers
Symbols JAK3; JAK-3; JAK3_HUMAN; JAKL; L-JAK; LJAK
External IDs OMIM600173 MGI99928 HomoloGene181 GeneCards: JAK3 Gene
EC number 2.7.10.2
Orthologs
Species Human Mouse
Entrez 3718 16453
Ensembl ENSG00000105639 ENSMUSG00000031805
UniProt P52333 n/a
RefSeq (mRNA) NM_000215.3 NM_010589
RefSeq (protein) NP_000206.2 NP_034719
Location (UCSC) Chr 19:
17.94 – 17.96 Mb
Chr 8:
74.2 – 74.21 Mb
PubMed search [1] [2]

Tyrosine-protein kinase JAK3 is an enzyme that in humans is encoded by the JAK3 gene.[1][2]

JAK3 encodes Janus kinase 3, a tyrosine kinase that belongs to the Janus family. JAK3 functions in signal transduction and interacts with members of the STAT (signal transduction and activators of transcription) family. JAK3 is predominantly expressed in immune cells and transduces a signal in response to its activation via tyrosine phosphorylation by interleukin receptors. Mutations that abrogate Janus kinase 3 function cause an autosomal SCID (severe combined immunodeficiency disease).[3]

Since JAK3 expression is restricted mostly to hematopoietic cells, its role in cytokine signaling is thought to be more restricted than other JAKs. It is most commonly expressed in T cells and NK cells, but has been induced in other leukocytes, including monocytes. Jak3 is involved in signal transduction by receptors that employ the common gamma chain (γC) of the type I cytokine receptor family (e.g. IL-2R, IL-4R, IL-7R, IL-9R, IL-15R, and IL-21R).[4] Mutations of JAK3 result in severe combined immunodeficiency (SCID). Mice that do not express JAK3 have T-cells and B-cells that fail to respond to many cytokines.[5]

Contents

Interactions

Janus kinase 3 has been shown to interact with CD247,[6] TIAF1[7] and IL2RG.[8][9]

References

  1. ^ Riedy MC, Dutra AS, Blake TB, Modi W, Lal BK, Davis J, Bosse A, O'Shea JJ, Johnston JA (Feb 1997). "Genomic sequence, organization, and chromosomal localization of human JAK3". Genomics 37 (1): 57–61. doi:10.1006/geno.1996.0520. PMID 8921370. 
  2. ^ Hoffman SM, Lai KS, Tomfohrde J, Bowcock A, Gordon LA, Mohrenweiser HW (Sep 1997). "JAK3 maps to human chromosome 19p12 within a cluster of proto-oncogenes and transcription factors". Genomics 43 (1): 109–11. doi:10.1006/geno.1997.4792. PMID 9226382. 
  3. ^ "Entrez Gene: JAK3 Janus kinase 3 (a protein tyrosine kinase, leukocyte)". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=3718. 
  4. ^ Johnston JA, Kawamura M, Kirken RA, Chen YQ, Blake TB, Shibuya K, Ortaldo JR, McVicar DW, O'Shea JJ. (1994). "Phosphorylation and activation of the Jak-3 Janus kinase in response to interleukin-2". Nature 370 (6485): 151–153. doi:10.1038/370151a0. PMID 8022485. 
  5. ^ Fujimoto M, Naka T, Nakagawa R, Kawazoe Y, Morita Y, Tateishi A, Okumura K, Narazaki M, Kishimoto T (2000). "Defective thymocyte development and perturbed homeostasis of T cells in STAT-induced STAT inhibitor-1/suppressors of cytokine signaling-1 transgenic mice". J. Immunol. 165 (4): 1799–806. PMID 10925257. 
  6. ^ Tomita, K; Saijo K, Yamasaki S, Iida T, Nakatsu F, Arase H, Ohno H, Shirasawa T, Kuriyama T, O'Shea J J, Saito T (Jul. 2001). "Cytokine-independent Jak3 activation upon T cell receptor (TCR) stimulation through direct association of Jak3 and the TCR complex". J. Biol. Chem. (United States) 276 (27): 25378–85. doi:10.1074/jbc.M011363200. ISSN 0021-9258. PMID 11349123. 
  7. ^ Ji, H; Zhai Q, Zhu J, Yan M, Sun L, Liu X, Zheng Z (Apr. 2000). "A novel protein MAJN binds to Jak3 and inhibits apoptosis induced by IL-2 deprival". Biochem. Biophys. Res. Commun. (UNITED STATES) 270 (1): 267–71. doi:10.1006/bbrc.2000.2413. ISSN 0006-291X. PMID 10733938. 
  8. ^ Miyazaki, T; Kawahara A, Fujii H, Nakagawa Y, Minami Y, Liu Z J, Oishi I, Silvennoinen O, Witthuhn B A, Ihle J N (Nov. 1994). "Functional activation of Jak1 and Jak3 by selective association with IL-2 receptor subunits". Science (UNITED STATES) 266 (5187): 1045–7. doi:10.1126/science.7973659. ISSN 0036-8075. PMID 7973659. 
  9. ^ Russell, S M; Johnston J A, Noguchi M, Kawamura M, Bacon C M, Friedmann M, Berg M, McVicar D W, Witthuhn B A, Silvennoinen O (Nov. 1994). "Interaction of IL-2R beta and gamma c chains with Jak1 and Jak3: implications for XSCID and XCID". Science (UNITED STATES) 266 (5187): 1042–5. doi:10.1126/science.7973658. ISSN 0036-8075. PMID 7973658. 

Further reading

External links