Phosphorylation on the PPP2R5D B regulatory subunit modulates the biochemical properties of protein phosphatase 2A.
To characterize the biochemical properties of the PP2A regulatory B subunit, PPP2R5D, we analyzed its phosphorylation sites, stoichiometry and effect on holoenzyme activity. PPP2R5D was phosphorylated on Ser-53, Ser-68, Ser-81, and Ser-566 by protein kinase A, and mutations at all four of these sites abolished any significant phosphorylation in vitro. In HEK293 cells, however, the Ser-566 was the major phosphorylation site after PKA activation by forskolin, with marginal phosphorylation on Ser-81. Inhibitory tyrosine phosphorylation on Tyr-307 of the PP2A catalytic C subunit was decreased after forskolin treatment. Kinetic analysis showed that overall PP2A activity was increased with phosphorylation by PPP2R5D phosphorylation. The apparent Km was reduced from 11.25 microM to 1.175 microM with PPP2R5D phosphorylation, resulting in an increase in catalytic activity. These data suggest that PKAmediated activation of PP2A is enabled by PPP2R5D phosphorylation, which modulates the affinity of the PP2A holoenzyme to its physiological substrates.
Yu
Un Young
UY
Department of Biochemistry, Ewha Womans University School of Medicine, Seoul 158-710, Korea.
Ahn
Jung-Hyuck
JH
D020134:Catalytic Domain; D002460:Cell Line; D005576:Colforsin / Q000494:pharmacology; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D016297:Mutagenesis, Site-Directed; D010766:Phosphorylation; D054648:Protein Phosphatase 2 / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
C525691:PPP2R5D protein, human; D005576:Colforsin; D017868:Cyclic AMP-Dependent Protein Kinases; D054648:Protein Phosphatase 2