title: Cloning the human SUMO1 promoter.
abstract: Regulation of the sumoylation system at the level of gene expression has not yet been explored. To begin to define transcriptional regulatory features, the promoter region for the SUMO1 gene was cloned from human genomic DNA and characterized. Initially, a 532 base pair fragment upstream of and including the predicted SUMO1 transcription start site (TSS) was cloned and shown to possess promoter activity. Subsequent deletion analysis showed that a smaller fragment containing 158 bp upstream of the TSS region exhibited basal promoter activity in both human and rodent cell lines. Within this basal promoter fragment, there were predicted binding sites for numerous transcription factors, including the nude mouse gene product, Whn (FoxN1). Electrophoretic mobility shift assays showed that Whn could bind to an ACGC motif adjacent to the TSR, and in transfection studies Whn stimulated a 3-fold increase in transcription from this cloned promoter in keratinocytes (HaCaT cells). Mutation of the ACGC motif abrogated both Whn binding and transcriptional activation, indicating that the Whn effect is likely due to direct interaction with this promoter element. Consistent with these observations on the cloned promoter region, Whn also modestly stimulated transcription from the endogenous, genomic SUMO1 promoter in HaCaT cells, consistent with Whn potentially playing a regulatory role for SUMO1 transcription in keratinocytes.
authors.affiliation: Graduate School of Biomedical Sciences at Houston, The University of Texas, Houston, TX 77225-0334, USA. Angela.M.Nanos@uth.tmc.edu
authors.forename: Angela
authors.initials: A
authors.lastname: Nanos-Webb
authors.forename: Adeline
authors.initials: A
authors.lastname: Deyrieux
authors.forename: Xue-lin
authors.initials: XL
authors.lastname: Bian
authors.forename: Germán
authors.initials: G
authors.lastname: Rosas-Acosta
authors.forename: Van G
authors.initials: VG
authors.lastname: Wilson
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002460:Cell Line; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D024202:Electrophoretic Mobility Shift Assay; D051858:Forkhead Transcription Factors / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation / Q000235:genetics*; D006801:Humans; D015603:Keratinocytes / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D025842:SUMO-1 Protein / Q000235:genetics*; D017422:Sequence Analysis, DNA
chemical_list: D017931:DNA Primers; D051858:Forkhead Transcription Factors; D025842:SUMO-1 Protein; C495501:SUMO1 protein, human; C090140:Whn protein