PPP2R1A-PPP2R2A-interacting phosphatase regulator 1 is a protein that in humans is encoded by the PABIR1 gene. The PABIR1 protein acts to promote cell growth and the progression of mitosis (specifically the G2/M checkpoint). It does this by inhibiting the protein phosphatase PP2A by binding to PPP2R2A and PPP2CA, and blocking their substrate binding site and active site respectively.
See also PABIR2 PABIR3
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