Serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit gamma isoform - Q13362 (2A5G_HUMAN)

 

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Function
The B regulatory subunit might modulate substrate selectivity and catalytic activity, and also might direct the localization of the catalytic enzyme to a particular subcellular compartment. The PP2A-PPP2R5C holoenzyme may specifically dephosphorylate and activate TP53 and play a role in DNA damage-induced inhibition of cell proliferation. PP2A-PPP2R5C may also regulate the ERK signaling pathway through ERK dephosphorylation. UniProt
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Subunit Structure
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. Interacts with PPP2CA AND PPP2R1A; the interaction is direct. Interacts with SGO1; the interaction is direct. Isoform 1 and isoform 2 interact with TP53 (phosphorylated at Ser-15 by ATM); increased upon DNA damage it drives PP2A-mediated dephosphorylation of TP53 at Thr-55. Interacts with IER3 and/or ERK kinases; regulates ERK dephosphorylation. Interacts with CIP2A; this interaction stabilizes CIP2A (PubMed:28174209). UniProt
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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