Recombinant Human Serine/threonine-protein phosphatase 2A activator (PTPA)

Uniprot Id

Q15257

Target Species

Human

Target Name

PTPA

Target Full Name

Serine/threonine-protein phosphatase 2A activator

Target Function

PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Acts as a regulatory subunit for serine/threonine-protein phosphatase 2A (PP2A) modulating its activity or substrate specificity, probably by inducing a conformational change in the catalytic subunit, a proposed direct target of the PPIase. Can reactivate inactive phosphatase PP2A-phosphatase methylesterase complexes (PP2A(i)) in presence of ATP and Mg(2+). Reversibly stimulates the variable phosphotyrosyl phosphatase activity of PP2A core heterodimer PP2A(D) in presence of ATP and Mg(2+) (in vitro). The phosphotyrosyl phosphatase activity is dependent of an ATPase activity of the PP2A(D):PPP2R4 complex. Is involved in apoptosis; the function appears to be independent from PP2A.

Target Subcellular Location

Cytoplasm. Nucleus.

Target Protein Families

PTPA-type PPIase family

Target Tissue Specificity

Widely expressed.

Target Research Area

others

Target Synonyms

subunit B''; KIAA0044; MGC2184; Phosphotyrosyl phosphatase activator; PP2A; PP2A phosphatase activator; PP2A subunit B'; PP2A subunit B' isoform PR53; PP2A subunit B' PR53 isoform; PPP2R4; PR53; PR53 isoform; Protein phosphatase 2, regulatory subunit B-prime; Protein phosphatase 2A activator regulatory subunit 4; Protein phosphatase 2A regulatory subunit B' (PR 53); PTPA; PTPA_HUMAN; Serine/threonine protein phosphatase 2A regulatory subunit B'; Serine/threonine-protein phosphatase 2A activator; Serine/threonine-protein phosphatase 2A regulatory subunit 4; Serine/threonine-protein phosphatase 2A regulatory subunit B''

Target Background

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.