PPP1R15A

Recruits the serine/threonine-protein phosphatase PPP1CA to prevents excessive phosphorylation of the translation initiation factor eIF-2A/EIF2S1, thereby reversing the shut-off of protein synthesis initiated by stress-inducible kinases and facilitating recovery of cells from stress. Down-regulates the TGF-beta signaling pathway by promoting dephosphorylation of TGFB1 by PP1. May promote apoptosis by inducing p53/TP53 phosphorylation on 'Ser-15'. Plays an essential role in autophagy by tuning translation during starvation, thus enabling lysosomal biogenesis and a sustained autophagic flux. Also acts a viral restriction factor by attenuating HIV-1 and influenza A virus replication. Mechanistically, mediates the inhibition of HIV-1 TAR RNA-mediated translation. Mediates the inhibition of influenza A virus RNA polymerase..

Function from UniProtKB (O75807), read 2026-09-23. CC BY 4.0.