PIK3R4, also named as PI3-kinase p150 subunit, Belongs to the protein kinase superfamily and Ser/Thr protein kinase family. PIK3R4 is regulatory subunit of the PI3K complex. PIK3R4 may regulate membrane trafficking late in the endocytic pathway. PIK3R4 catalyze the reaction: ATP + a protein = ADP + a phosphoprotein. The antibody is specific to Ser1079(phospho).