Possible involvement of a novel STAM-associated molecule "AMSH" in intracellular signal transduction mediated by cytokines - PubMed

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• PMID: 10383417
• DOI: 10.1074/jbc.274.27.19129

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Possible involvement of a novel STAM-associated molecule "AMSH" in intracellular signal transduction mediated by cytokines

N Tanaka et al. J Biol Chem. 1999.

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Abstract

STAM containing an SH3 (Src homology 3) domain and an immunoreceptor tyrosine-based activation motif was previously revealed to be implicated in signaling pathways immediately downstream of Jak2 and Jak3 tyrosine kinases associated with cytokine receptors. We molecularly cloned a novel molecule interacting with the SH3 domain of STAM, which was named AMSH (associated molecule with the SH3 domain of STAM). AMSH contains a putative bipartite nuclear localization signal and a homologous region of a c-Jun activation domain-binding protein 1 (JAB1) subdomain in addition to a binding site for the SH3 domain of STAM. AMSH mutant deleted of the C-terminal half conferred dominant negative effects on signaling for DNA synthesis and c-myc induction mediated by interleukin 2 and granulocyte macrophage-colony-stimulating factor. These results suggest that AMSH plays a critical role in the cytokine-mediated intracellular signal transduction downstream of the Jak2/Jak3.STAM complex.

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