UNIPROT #

Q08209

PROTEIN NAME

Serine/threonine-protein phosphatase 2B catalytic subunit alpha isoform

GENE NAME

PPP3CA

SYNONYMS

PPP3CA

SEQUENCE SIMILARITIES

Belongs to the PPP phosphatase family. PP-2B subfamily.

TISSUE SPECIFICITY

Expressed in keratinocytes (at protein level).

SUBCELLULAR LOCATION

Cytoplasm. Cell membrane; Peripheral membrane protein. Cell membrane, sarcolemma. Note=Colocalizes with ACTN1 and MYOZ2 at the Z line in heart and skeletal muscle (By similarity). Recruited to the cell membrane by scaffold protein AKAP5 following L-type Ca(2+)-channel activation.

FUNCTION

Calcium-dependent, calmodulin-stimulated protein phosphatase which plays an essential role in the transduction of intracellular Ca(2+)-mediated signals. Many of the substrates contain a PxIxIT motif and/or a LxVP motif. In response to increased Ca(2+) levels, dephosphorylates and activates phosphatase SSH1 which results in cofilin dephosphorylation. In response to increased Ca(2+) levels following mitochondrial depolarization, dephosphorylates DNM1L inducing DNM1L translocation to the mitochondrion. Dephosphorylates heat shock protein HSPB1 (By similarity). Dephosphorylates and activates transcription factor NFATC1. In response to increased Ca(2+) levels, regulates NFAT-mediated transcription probably by dephosphorylating NFAT and promoting its nuclear translocation. Dephosphorylates and inactivates transcription factor ELK1. Dephosphorylates DARPP32. May dephosphorylate CRTC2 at 'Ser-171' resulting in CRTC2 dissociation from 14-3-3 proteins.