serine/threonine protein phosphatase 2A regulatory subunit B" alpha and beta subunits, and similar proteins
Heterotrimeric serine/threonine protein phosphatase 2A (PP2A) consists of scaffolding (A), catalytic (C), and variable (B, B', and B") subunits. The variable subunits dictate subcellular localization and substrate specificity of the PP2A holoenzyme. These B-family regulatory subunits play various roles including regulation of cytoskeletal assembly, neuronal differentiation, mitogen-activated protein kinase signaling, and apoptosis. This subfamily includes protein phosphatase 2A regulatory subunit B'' subunits alpha and beta, encoded by PPP2R3A and PPP2R3B. It also includes subunit delta encoded by PPP2R3D in mouse. They contain two-domain elongated structures with two calcium EF-hands which mediate Ca2+-dependent changes in phosphatase activity.
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