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• W1991750502 abstract "The tyrosine kinase Janus kinase 2 (JAK2) is activated by many cytokine receptors, including receptors for GH, leptin, and erythropoietin. However, very few proteins have been identified as binding partners for JAK2. Using a yeast 2-hybrid screen, we identified steroid-sensitive gene-1 (SSG1)/coiled-coil domain-containing protein 80 (Ccdc80) as a JAK2-binding partner. We demonstrate that Ccdc80 preferentially binds activated, tyrosyl-phosphorylated JAK2 but not kinase-inactive JAK2 (K882E) in both yeast and mammalian systems. Ccdc80 is tyrosyl phosphorylated in the presence of JAK2. The binding of Ccdc80 to JAK2 occurs via 1 or more of the 3 DUDES/SRPX (DRO1-URB-DRS-Equarin-SRPUL/sushi repeat containing protein, x-linked) domain 5 domains of Ccdc80. Mutagenesis of the second DUDES domain suggests that the N-terminal third of the DUDES domain is sufficient for JAK2 binding. Ccdc80 does not alter the kinase activity of JAK2. However, Ccdc80 increases GH-dependent phosphorylation of Stat (signal transducer and activator of transcription) 5b on Tyr699 and substantially enhances both basal and GH-dependent phosphorylation/activation of Stat3 on Tyr705. Furthermore, Ccdc80 belongs to the group of proteins that function both in the intracellular compartment and are secreted. Secreted Ccdc80 associates with the extracellular matrix and is also found in the medium. A substantial portion of the Ccdc80 detected in the medium is cleaved. Finally, consistent with the DUDES domain serving as a JAK2-binding domain, we also demonstrate that another protein that contains a DUDES domain, SRPX2, binds preferentially to the activated tyrosyl-phosphorylated form of JAK2." @default.
• W1991750502 created "2016-06-24" @default.
• W1991750502 creator A5022632094 @default.
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• W1991750502 creator A5075548351 @default.
• W1991750502 creator A5089134677 @default.
• W1991750502 date "2013-04-01" @default.
• W1991750502 modified "2023-09-26" @default.
• W1991750502 title "Identification of Steroid-Sensitive Gene-1/Ccdc80 as a JAK2-Binding Protein" @default.
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• W1991750502 doi "https://doi.org/10.1210/me.2011-1275" @default.
• W1991750502 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3607695" @default.
• W1991750502 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23449887" @default.
• W1991750502 hasPublicationYear "2013" @default.
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