Catalytic activity:ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. ,Function:Specifically phosphorylates 'Tyr-504' on LCK , which acts as a negative regulatory site. Can also act on the LYN and FYN kinases. ,PTM:Autophosphorylation of Tyr-304 occurs only at abnormally high CSK concentrations in vitro. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. CSK subfamily. ,similarity:Contains 1 protein kinase domain. ,similarity:Contains 1 SH2 domain. ,similarity:Contains 1 SH3 domain. ,subcellular location:Mainly cytoplasmic , also present in lipid rafts. ,subunit:Interacts with PTPN8 (By similarity) . Interacts with phosphorylated SIT1 , PAG1 , LIME1 and TGFB1I1. ,tissue specificity:Expressed in lung and macrophages. ,
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