Carboxy-terminal domain RNA polymerase II polypeptide A small phosphatase 3, CTD small phosphatase-like protein, CTDSL_HUMAN, CTDSP-like, Ctdspl, hYA22, N-like protein, NLI-interacting factor 1, Nuclear LIM interactor-interacting factor 1, Protein YA22, RBSP3, SCP3, Small C-terminal domain phosphatase 3, Small CTD phosphatase 3.
Preferentially catalyzes the dephosphorylation of Ser-5 within the tandem 7 residues repeats in the C-terminal domain (CTD) of the largest RNA polymerase II subunit POLR2A. Negatively regulates RNA polymerase II transcription, possibly by controlling the transition from initiation/capping to processive transcript elongation (By similarity). Recruited by REST to neuronal genes that contain RE-1 elements, leading to neuronal gene silencing in non-neuronal cells.
