PTM:Phosphorylated upon DNA damage, probably by ATM or ATR.,similarity:Belongs to the SF3B5 family.,subunit:Component of splicing factor SF3B which is composed of four subunits; SF3B4/SAP49, SF3B3/SAP130, SF3B2/SAP145, SF3B1/SAP155. SF3B associates with the splicing factor SF3A and a 12S RNA unit to form the U2 small nuclear ribonucleoproteins complex (U2 snRNP).,
Nucleus .
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