Domain:Contains one Pro-Xaa-Val-Xaa-Leu (PxVxL) motif , which is required for interaction with chromoshadow domains. This motif requires additional residues -7 , -6 , +4 and +5 of the central Val which contact the chromoshadow domain. ,Domain:The SH3 domain mediates the interaction with USP8. ,Domain:The VHS and UIM domains mediate the interaction with ubiquitinated proteins. ,Function:Involved in intracellular signal transduction mediated by cytokines and growth factors. Upon IL-2 and GM-CSL stimulation , it plays a role in signaling leading to DNA synthesis and c-myc induction. May also play a role in T-cell development. Involved in down-regulation of receptor tyrosine kinase via multivesicular body (MVBs) when complexed with HGS (ESCRT-0 complex) . The ESCRT-0 complex binds ubiquitin and acts as sorting machinery that recognizes ubiquitinated receptors and transfers them to further sequential lysosomal sorting/trafficking processes. ,PTM:Phosphorylated in response to IL-2 , GM-CSF , EGF and PDGF. ,similarity:Belongs to the STAM family. ,similarity:Contains 1 ITAM domain. ,similarity:Contains 1 SH3 domain. ,similarity:Contains 1 UIM (ubiquitin-interacting motif) repeat. ,similarity:Contains 1 VHS domain. ,subunit:Component of the ESCRT-0 complex composed of STAM or STAM2 and HGS. Part of a complex at least composed of HSG , STAM2 and EPS15. Interacts with JAK2 and JAK3. Interacts with ubiquitinated proteins and the deubiquitinating enzyme USP8/UBPY (By similarity) . Interacts (via the via the PxVxL motif) with CBX5; the interaction is direct. Interacts with VPS37C. Interacts with ubiquitin; the interaction is direct. ,tissue specificity:Ubiquitously expressed. ,
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