Journal
FEBS LETTERS
Volume 582, Issue 2, Pages 177-184Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2007.11.083
Keywords
SREBP-1a; EGR-1; Sp1; gene expression; promoter; cell line
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Sterol regulatory element binding protein (SREBP)la is a transcription factor that is highly expressed in actively growing cells, and is involved in the biosynthesis of cholesterol, fatty acids and phospholipids. We have mapped the minimal human SREBP-1a promoter region to 75 bp upstream of the translation start site where we discovered a functional role for the 3 GC-boxes containing overlapping sites for the Sp1 and EGR-1 transcription factors. Intact SP1-binding sites are essential for promoter activity, whereas EGR-1 suppresses the transcription of the human SREBP-1a promoter. These results reveal a novel physiologically relevant transcriptional mechanism for the reciprocal regulation of the SREBP-1a expression. (C) 2007 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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