Protein phosphatase 2A is one of the four major Ser/Thr phosphatases and is implicated in the negative control of cell growth and division. Protein phosphatase 2A holoenzymes are heterotrimeric proteins composed of a structural subunit A, a catalytic subunit C, and a regulatory subunit B. The regulatory subunit is encoded by a diverse set of genes that have been grouped into the B/PR55, B'/PR61, and B''/PR72 families. These different regulatory subunits confer distinct enzymatic specificities and intracellular localizations to the holozenzyme. The product of this gene belongs to the B' family. This gene encodes a specific phosphotyrosyl phosphatase activator of the dimeric form of protein phosphatase 2A. Alternative splicing results in multiple transcript variants encoding different isoforms.
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Protein Aliases: MGC2184; OTTHUMP00000022333; Phosphotyrosyl phosphatase activator; PP2A phosphatase activator; PP2A subunit B' isoform PR53; PP2A, subunit B', PR53 isoform; protein phosphatase 2 regulatory subunit 4; protein phosphatase 2A activator, regulatory subunit 4; protein phosphatase 2A regulatory subunit 4; protein phosphatase 2A, regulatory subunit B (PR 53); protein phosphatase 2A, regulatory subunit B' (PR 53); PTPA; Serine/threonine-protein phosphatase 2A activator; Serine/threonine-protein phosphatase 2A regulatory subunit 4; Serine/threonine-protein phosphatase 2A regulatory subunit B'
Gene Aliases: 2610042B21Rik; C77440; N28142; PP2A; PPP2R4; PR53; PTPA