FEATURES

FAMILY

phosphatase 2A regulatory subunit A family

DESCRIPTION

Also known as 2AAA_HUMAN, PPP2R1A. The PR65 subunit of protein phosphatase 2A serves as a scaffolding molecule to coordinate the assembly of the catalytic subunit and a variable regulatory B subunit. Upon interaction with GNA12 promotes dephosphorylation of microtubule associated protein TAU/MAPT (PubMed:15525651). Required for proper chromosome segregation and for centromeric localization of SGO1 in mitosis (PubMed:16580887). PP2A consists of a common heterodimeric core enzyme, composed of PPP2CA a 36 kDa catalytic subunit (subunit C) and PPP2R1A a 65 kDa constant regulatory subunit (PR65 or subunit A), that associates with a variety of regulatory subunits. Proteins that associate with the core dimer include three families of regulatory subunits B (the R2/B/PR55/B55, R3/B''/PR72/PR130/PR59 and R5/B'/B56 families), the 48 kDa variable regulatory subunit, viral proteins, and cell signaling molecules. Found in a complex with at least ARL2, PPP2CB, PPP2R1A, PPP2R2A, PPP2R5E and TBCD (By similarity). Interacts with FOXO1; the interaction dephosphorylates FOXO1 on AKT-mediated phosphorylation sites (By similarity). Interacts with IPO9 (PubMed:12670497). Interacts with TP53 and SGO1 (PubMed:17245430, PubMed:16580887). Interacts with PLA2G16; this interaction might decrease PP2A activity (PubMed:17374643). Interacts with CTTNBP2NL (PubMed:18782753). Interacts with GNA12; the interaction promotes protein phosphatase 2A activation causing dephosphorylation of MAPT (PubMed:15525651). Interacts with CIP2A; this interaction stabilizes CIP2A (PubMed:28174209). Interacts with PABIR1/FAM122A (PubMed:27588481). Interacts with ADCY8; antagonizes interaction between ADCY8 and calmodulin (By similarity). Interacts with CRTC3 (when phosphorylated at 'Ser-391') (PubMed:30611118). Interacts with SPRY2 (PubMed:17974561).

EXTERNAL LINKS

PPP2R1A

Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoform

PPP2R1A

Molecular Synopsis