Serine/threonine-protein phosphatase 2A activator 1

UniProtKB accession:  P40454

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UniProtKB description:  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 TAP42-associated PP2A-like phosphatases modulating their activity or substrate specificity, probably by inducing a conformational change in the catalytic subunit, a direct target of the PPIase. Can reactivate inactive phosphatase PP2A-phosphatase methylesterase complexes (PP2Ai) in presence of ATP and Mg(2+) by dissociating the inactive form from the complex. Involved in the regulation of cell cycle progression, mitotic spindle formation, bud morphogenesis and DNA repair.