Description
E3 SUMO-protein ligase PIAS1 is an enzyme that in humans is encoded by the PIAS1 gene. This gene encodes a member of the mammalian PIAS [protein inhibitor of activated STAT-1(signal transducer and activator of transcription-1)] family. It contains a putative zinc-binding motif and a highly acidic region. PIAS1 inhibited STAT1-mediated gene activation in response to interferon when expressed in mammalian cells. It functions in testis as a nuclear receptor transcriptional coregulator and may have a role in AR initiation and maintenance of spermatogenesis. PIAS1 can also function as a SUMO ligase, or possibly as a tightly bound regulator of it, toward p53