Synonyms:CIS4, SOCS4 Background:SOCS family proteins form part of a classical negative feedback system that regulates cytokine signal transduction. May be a substrate recognition component of a SCF-like ECS(Elongin BC-CUL2/5-SOCS-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins(By similarity). Regulates KIT degradation by ubiquitination of the tyrosine-phosphorylated receptor.