SUMO-1 Modification Represses Sp3 Transcriptional Activation and Modulates Its Subnuclear Localization

• Autores: Jennifer L. Best, L. I. Zon, S. Ross, Grace Gill
• Localización: Molecular cell, ISSN 1097-2765, Nº 10, 2002, págs. 831-842
• Idioma: inglés
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• Resumen

  • The GC box binding transcription factor Sp3 both activates and represses transcription. We have found that Sp3 activity is regulated by SUMO-1 modification. Endogenous Sp3 is sumoylated and localized to the nuclear periphery and in nuclear dots. Removal of SUMO-1 from Sp3 by mutation of the SUMO acceptor lysines or expression of the SUMO-1 protease SuPr-1 converted Sp3 to a strong activator with a diffuse nuclear localization. Covalent attachment of SUMO-1 to Sp3 by gene fusion was sufficient to repress Sp3-dependent transcription and relocalize Sp3 to the nuclear periphery and nuclear dots. These studies reveal a direct effect of SUMO-1 modification on activity of a dual function transcription factor and provide a mechanism for functional specificity within the Sp transcription factor family.