Janus kinase 2

Last updated
JAK2
Protein JAK2 PDB 2b7a.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases JAK2 , JTK10, THCYT3, Janus kinase 2, MAX2
External IDs OMIM: 147796 MGI: 96629 HomoloGene: 21033 GeneCards: JAK2
Orthologs
SpeciesHumanMouse
Entrez

3717

16452

Ensembl

ENSG00000096968

ENSMUSG00000024789

UniProt

O60674

Q62120

RefSeq (mRNA)

NM_001048177
NM_008413

RefSeq (protein)

NP_001041642
NP_032439

Location (UCSC) Chr 9: 4.98 – 5.13 Mb Chr 19: 29.23 – 29.29 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Janus kinase 2 (commonly called JAK2) is a non-receptor tyrosine kinase. It is a member of the Janus kinase family and has been implicated in signaling by members of the type II cytokine receptor family (e.g. interferon receptors), the GM-CSF receptor family (IL-3R, IL-5R and GM-CSF-R), the gp130 receptor family (e.g., IL-6R), and the single chain receptors (e.g. Epo-R, Tpo-R, GH-R, PRL-R). [5] [6]

The distinguishing feature between janus kinase 2 and other JAK kinases is the lack of Src homology binding domains (SH2/SH3) and the presence of up to seven JAK homology domains (JH1-JH7). Nonetheless the terminal JH domains retain a high level of homology to tyrosine kinase domains. An interesting note is that only one of these carboxy-terminal JH domains retains full kinase function (JH1) while the other (JH2), previously thought to have no kinase functionality and accordingly termed a pseudokinase domain, has since been found to be catalytically active, albeit at only 10% that of the JH1 domain. [7] [8]

Loss of Jak2 is lethal by embryonic day 12 in mice. [9]

JAK2 orthologs [10] have been identified in all mammals for which complete genome data are available.

Clinical significance

JAK2 gene fusions with the TEL(ETV6) (TEL-JAK2) and PCM1 genes have been found in patients suffering leukemia, particularly clonal eosinophilia forms of the disease. [11] [12] [13]

Mutations in JAK2 have been implicated in polycythemia vera, essential thrombocythemia, and myelofibrosis as well as other myeloproliferative disorders. [14] This mutation (V617F), a change of valine to phenylalanine at the 617 position, appears to render hematopoietic cells more sensitive to growth factors such as erythropoietin and thrombopoietin, because the receptors for these growth factors require JAK2 for signal transduction. An inhibitor of JAK2-STAT5, AZD1480, was pointed as having activity in primary and CRPC. [15] Jak2 mutation, when demonstrable, is one of the methods of diagnosing polycythemia vera. [16]

Interactions

Janus kinase 2 has been shown to interact with:

Prolactin signals through JAK2 are dependent on STAT5, and on the RUSH transcription factors. [60]

See also

Related Research Articles

The JAK-STAT signaling pathway is a chain of interactions between proteins in a cell, and is involved in processes such as immunity, cell division, cell death, and tumour formation. The pathway communicates information from chemical signals outside of a cell to the cell nucleus, resulting in the activation of genes through the process of transcription. There are three key parts of JAK-STAT signalling: Janus kinases (JAKs), signal transducer and activator of transcription proteins (STATs), and receptors. Disrupted JAK-STAT signalling may lead to a variety of diseases, such as skin conditions, cancers, and disorders affecting the immune system.

<span class="mw-page-title-main">Epidermal growth factor receptor</span> Transmembrane protein

The epidermal growth factor receptor is a transmembrane protein that is a receptor for members of the epidermal growth factor family of extracellular protein ligands.

<span class="mw-page-title-main">Receptor tyrosine kinase</span> Class of enzymes

Receptor tyrosine kinases (RTKs) are the high-affinity cell surface receptors for many polypeptide growth factors, cytokines, and hormones. Of the 90 unique tyrosine kinase genes identified in the human genome, 58 encode receptor tyrosine kinase proteins. Receptor tyrosine kinases have been shown not only to be key regulators of normal cellular processes but also to have a critical role in the development and progression of many types of cancer. Mutations in receptor tyrosine kinases lead to activation of a series of signalling cascades which have numerous effects on protein expression. Receptor tyrosine kinases are part of the larger family of protein tyrosine kinases, encompassing the receptor tyrosine kinase proteins which contain a transmembrane domain, as well as the non-receptor tyrosine kinases which do not possess transmembrane domains.

<span class="mw-page-title-main">Erythropoietin receptor</span> Protein-coding gene in the species Homo sapiens

The erythropoietin receptor (EpoR) is a protein that in humans is encoded by the EPOR gene. EpoR is a 52kDa peptide with a single carbohydrate chain resulting in an approximately 56-57 kDa protein found on the surface of EPO responding cells. It is a member of the cytokine receptor family. EpoR pre-exists as dimers. These dimers were originally thought to be formed by extracellular domain interactions, however, it is now assumed that it is formed by interactions of the transmembrane domain and that the original structure of the extracellular interaction site was due to crystallisation conditions and does not depict the native conformation. Binding of a 30 kDa ligand erythropoietin (Epo), changes the receptor's conformational change, resulting in the autophosphorylation of Jak2 kinases that are pre-associated with the receptor. At present, the most well-established function of EpoR is to promote proliferation and rescue of erythroid progenitors from apoptosis.

<span class="mw-page-title-main">GRB2</span> Protein-coding gene in the species Homo sapiens

Growth factor receptor-bound protein 2 also known as Grb2 is an adaptor protein involved in signal transduction/cell communication. In humans, the GRB2 protein is encoded by the GRB2 gene.

<span class="mw-page-title-main">ZAP70</span> Protein-coding gene in the species Homo sapiens

ZAP-70 is a protein normally expressed near the surface membrane of lymphocytes. It is most prominently known to be recruited upon antigen binding to the T cell receptor (TCR), and it plays a critical role in T cell signaling.

<span class="mw-page-title-main">Glycoprotein 130</span> Mammalian protein found in Homo sapiens

Glycoprotein 130 is a transmembrane protein which is the founding member of the class of all cytokine receptors. It forms one subunit of the type I cytokine receptor within the IL-6 receptor family. It is often referred to as the common gp130 subunit, and is important for signal transduction following cytokine engagement. As with other type I cytokine receptors, gp130 possesses a WSXWS amino acid motif that ensures correct protein folding and ligand binding. It interacts with Janus kinases to elicit an intracellular signal following receptor interaction with its ligand. Structurally, gp130 is composed of five fibronectin type-III domains and one immunoglobulin-like C2-type (immunoglobulin-like) domain in its extracellular portion.

<span class="mw-page-title-main">STAT3</span> Protein-coding gene in the species Homo sapiens

Signal transducer and activator of transcription 3 (STAT3) is a transcription factor which in humans is encoded by the STAT3 gene. It is a member of the STAT protein family.

<span class="mw-page-title-main">Tyrosine kinase 2</span> Enzyme and coding gene in humans

Non-receptor tyrosine-protein kinase TYK2 is an enzyme that in humans is encoded by the TYK2 gene.

<span class="mw-page-title-main">Janus kinase 3</span> Mammalian protein found in Homo sapiens

Tyrosine-protein kinase JAK3 is a tyrosine kinase enzyme that in humans is encoded by the JAK3 gene.

<span class="mw-page-title-main">Janus kinase 1</span>

JAK1 is a human tyrosine kinase protein essential for signaling for certain type I and type II cytokines. It interacts with the common gamma chain (γc) of type I cytokine receptors, to elicit signals from the IL-2 receptor family, the IL-4 receptor family, the gp130 receptor family. It is also important for transducing a signal by type I (IFN-α/β) and type II (IFN-γ) interferons, and members of the IL-10 family via type II cytokine receptors. Jak1 plays a critical role in initiating responses to multiple major cytokine receptor families. Loss of Jak1 is lethal in neonatal mice, possibly due to difficulties suckling. Expression of JAK1 in cancer cells enables individual cells to contract, potentially allowing them to escape their tumor and metastasize to other parts of the body.

<span class="mw-page-title-main">IRS1</span> Protein-coding gene in the species Homo sapiens

Insulin receptor substrate 1 (IRS-1) is a signaling adapter protein that in humans is encoded by the IRS-1 gene. It is a 131 kDa protein with amino acid sequence of 1242 residues. It contains a single pleckstrin homology (PH) domain at the N-terminus and a PTB domain ca. 40 residues downstream of this, followed by a poorly conserved C-terminus tail. Together with IRS2, IRS3 (pseudogene) and IRS4, it is homologous to the Drosophila protein chico, whose disruption extends the median lifespan of flies up to 48%. Similarly, Irs1 mutant mice experience moderate life extension and delayed age-related pathologies.

<span class="mw-page-title-main">SOCS3</span> Protein

Suppressor of cytokine signaling 3 is a protein that in humans is encoded by the SOCS3 gene. This gene encodes a member of the STAT-induced STAT inhibitor (SSI), also known as suppressor of cytokine signaling (SOCS), family. SSI family members are cytokine-inducible negative regulators of cytokine signaling.

<span class="mw-page-title-main">CRKL</span> Protein-coding gene in the species Homo sapiens

Crk-like protein is a protein that in humans is encoded by the CRKL gene.

<span class="mw-page-title-main">Suppressor of cytokine signaling 1</span> Protein-coding gene in the species Homo sapiens

Suppressor of cytokine signaling 1 is a protein that in humans is encoded by the SOCS1 gene. SOCS1 orthologs have been identified in several mammals for which complete genome data are available.

<span class="mw-page-title-main">TEC (gene)</span> Human gene

Tyrosine-protein kinase Tec is a tyrosine kinase that in humans is encoded by the TEC gene. Tec kinase is expressed in hematopoietic, liver, and kidney cells and plays an important role in T-helper cell processes. Tec kinase is the name-giving member of the Tec kinase family, a family of non-receptor protein-tyrosine kinases.

<span class="mw-page-title-main">STAM2</span> Protein-coding gene in the species Homo sapiens

Signal transducing adapter molecule 2 is a protein that in humans is encoded by the STAM2 gene.

<span class="mw-page-title-main">Signal transducing adaptor molecule</span> Protein-coding gene in the species Homo sapiens

Signal transducing adapter molecule 1 is a protein that in humans is encoded by the STAM gene.

A non-receptor tyrosine kinase (nRTK) is a cytosolic enzyme that is responsible for catalysing the transfer of a phosphate group from a nucleoside triphosphate donor, such as ATP, to tyrosine residues in proteins. Non-receptor tyrosine kinases are a subgroup of protein family tyrosine kinases, enzymes that can transfer the phosphate group from ATP to a tyrosine residue of a protein (phosphorylation). These enzymes regulate many cellular functions by switching on or switching off other enzymes in a cell.

<span class="mw-page-title-main">Tyrosine-protein kinase CSK</span> Kinase enzyme that phosphorylates Src-family kinases

Tyrosine-protein kinase CSK also known as C-terminal Src kinase is an enzyme that, in humans, is encoded by the CSK gene. This enzyme phosphorylates tyrosine residues located in the C-terminal end of Src-family kinases (SFKs) including SRC, HCK, FYN, LCK, LYN and YES1.

References

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  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000024789 - Ensembl, May 2017
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  6. ↑ Brooks AJ, Dai W, O'Mara ML, Abankwa D, Chhabra Y, Pelekanos RA, et al. (2014). "Mechanism of activation of protein kinase JAK2 by the growth hormone receptor". Science. 344 (6185): 1249783. doi:10.1126/science.1249783. PMID   24833397. S2CID   27946074.
  7. ↑ Morgan KJ, Gilliland DG (2008). "A role for JAK2 mutations in myeloproliferative diseases". Annual Review of Medicine. 59 (1): 213–22. doi:10.1146/annurev.med.59.061506.154159. PMID   17919086.
  8. ↑ Ungureanu D, Wu J, Pekkala T, Niranjan Y, Young C, Jensen ON, Xu CF, Neubert TA, Skoda RC, Hubbard SR, Silvennoinen O (August 2011). "The pseudokinase domain of JAK2 is a dual-specificity protein kinase that negatively regulates cytokine signaling". Nature Structural & Molecular Biology. 18 (9): 971–976. doi:10.1038/nsmb.2099. PMC   4504201 . PMID   21841788.
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  12. ↑ Reiter A, Walz C, Watmore A, Schoch C, Blau I, Schlegelberger B, Berger U, Telford N, Aruliah S, Yin JA, Vanstraelen D, Barker HF, Taylor PC, O'Driscoll A, Benedetti F, Rudolph C, Kolb HJ, Hochhaus A, Hehlmann R, Chase A, Cross NC (April 2005). "The t(8;9)(p22;p24) is a recurrent abnormality in chronic and acute leukemia that fuses PCM1 to JAK2". Cancer Research. 65 (7): 2662–7. doi: 10.1158/0008-5472.CAN-04-4263 . PMID   15805263.
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  34. ↑ Yin T, Shen R, Feng GS, Yang YC (January 1997). "Molecular characterization of specific interactions between SHP-2 phosphatase and JAK tyrosine kinases". The Journal of Biological Chemistry. 272 (2): 1032–7. doi: 10.1074/jbc.272.2.1032 . PMID   8995399.
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  36. ↑ Maegawa H, Kashiwagi A, Fujita T, Ugi S, Hasegawa M, Obata T, Nishio Y, Kojima H, Hidaka H, Kikkawa R (November 1996). "SHPTP2 serves adapter protein linking between Janus kinase 2 and insulin receptor substrates". Biochemical and Biophysical Research Communications. 228 (1): 122–7. doi:10.1006/bbrc.1996.1626. PMID   8912646.
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  39. ↑ Pollack BP, Kotenko SV, He W, Izotova LS, Barnoski BL, Pestka S (October 1999). "The human homologue of the yeast proteins Skb1 and Hsl7p interacts with Jak kinases and contains protein methyltransferase activity". The Journal of Biological Chemistry. 274 (44): 31531–42. doi: 10.1074/jbc.274.44.31531 . PMID   10531356.
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  41. ↑ Xie S, Lin H, Sun T, Arlinghaus RB (October 2002). "Jak2 is involved in c-Myc induction by Bcr-Abl". Oncogene. 21 (47): 7137–46. doi: 10.1038/sj.onc.1205942 . PMID   12370803.
  42. ↑ VanderKuur J, Allevato G, Billestrup N, Norstedt G, Carter-Su C (March 1995). "Growth hormone-promoted tyrosyl phosphorylation of SHC proteins and SHC association with Grb2". The Journal of Biological Chemistry. 270 (13): 7587–93. doi: 10.1074/jbc.270.13.7587 . PMID   7535773.
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  45. ↑ Sasaki A, Yasukawa H, Suzuki A, Kamizono S, Syoda T, Kinjyo I, Sasaki M, Johnston JA, Yoshimura A (June 1999). "Cytokine-inducible SH2 protein-3 (CIS3/SOCS3) inhibits Janus tyrosine kinase by binding through the N-terminal kinase inhibitory region as well as SH2 domain". Genes to Cells. 4 (6): 339–51. doi:10.1046/j.1365-2443.1999.00263.x. PMID   10421843. S2CID   24871585.
  46. 1 2 Masuhara M, Sakamoto H, Matsumoto A, Suzuki R, Yasukawa H, Mitsui K, Wakioka T, Tanimura S, Sasaki A, Misawa H, Yokouchi M, Ohtsubo M, Yoshimura A (October 1997). "Cloning and characterization of novel CIS family genes". Biochemical and Biophysical Research Communications. 239 (2): 439–46. doi:10.1006/bbrc.1997.7484. PMID   9344848.
  47. 1 2 Barahmand-Pour F, Meinke A, Groner B, Decker T (May 1998). "Jak2-Stat5 interactions analyzed in yeast". The Journal of Biological Chemistry. 273 (20): 12567–75. doi: 10.1074/jbc.273.20.12567 . PMID   9575217.
  48. 1 2 Fujitani Y, Hibi M, Fukada T, Takahashi-Tezuka M, Yoshida H, Yamaguchi T, Sugiyama K, Yamanaka Y, Nakajima K, Hirano T (February 1997). "An alternative pathway for STAT activation that is mediated by the direct interaction between JAK and STAT". Oncogene. 14 (7): 751–61. doi: 10.1038/sj.onc.1200907 . PMID   9047382.
  49. ↑ Takeshita T, Arita T, Higuchi M, Asao H, Endo K, Kuroda H, Tanaka N, Murata K, Ishii N, Sugamura K (April 1997). "STAM, signal transducing adaptor molecule, is associated with Janus kinases and involved in signaling for cell growth and c-myc induction". Immunity. 6 (4): 449–57. doi: 10.1016/S1074-7613(00)80288-5 . PMID   9133424.
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