Anti-E3 SUMO-protein ligase PIAS1 PIAS1 Antibody Picoband® Fluoro488 Conjugated

E3 SUMO-protein ligase PIAS1 is an enzyme that in humans is encoded by the PIAS1 gene. It is mapped to 15q23. This gene encodes a member of the protein inhibitor of activated STAT (PIAS) family. PIAS proteins function as SUMO E3 ligases and play important roles in many cellular processes by mediating the sumoylation of target proteins. This protein plays a central role as a transcriptional coregulator of numerous cellular pathways includign the STAT1 and nuclear factor kappaB pathways. Alternate splicing results in multiple transcript variants.

E3 SUMO-protein ligase PIAS1; DEAD/H box-binding protein 1; E3 SUMO-protein transferase PIAS1; Gu-binding protein; GBP; Protein inhibitor of activated STAT protein 1; RNA helicase II-binding protein; PIAS1; DDXBP1

Functions as an E3-type small ubiquitin-like modifier (SUMO) ligase, stabilizing the interaction between UBE2I and the substrate, and as a SUMO-tethering factor. Plays a crucial role as a transcriptional coregulation in various cellular pathways, including the STAT pathway, the p53 pathway and the steroid hormone signaling pathway. In vitro, binds A/T-rich DNA. The effects of this transcriptional coregulation, transactivation or silencing, may vary depending upon the biological context. Sumoylates PML (at'Lys-65' and 'Lys-160') and PML-RAR and promotes their ubiquitin-mediated degradation. PIAS1-mediated sumoylation of PML promotes its interaction with CSNK2A1/CK2 which in turn promotes PML phosphorylation and degradation. Enhances the sumoylation of MTA1 and may participate in its paralog-selective sumoylation. Plays a dynamic role in adipogenesis by promoting the SUMOylation and degradation of CEBPB.

1. Kahyo, T., Nishida, T., Yasuda, H. Involvement of PIAS1 in the sumoylation of tumor suppressor p53. Molec. Cell 8: 713-718, 2001. 2. Lee, H., Quinn, J. C., Prasanth, K. V., Swiss, V. A., Economides, K. D., Camacho, M. M., Spector, D. L., Abate-Shen, C. PIAS1 confers DNA-binding specificity on the Msx1 homeoprotein. Genes Dev. 20: 784-794, 2006. 3. Liu, B., Liao, J., Rao, X., Kushner, S. A., Chung, C. D., Chang, D. D., Shuai, K. Inhibition of Stat1-mediated gene activation by PIAS1. Proc. Nat. Acad. Sci. 95: 10626-10631, 1998.