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Mol Cell Biol. 1990 June; 10(6): 2653-2659

Characterization of the promoter elements required for hepatic and intestinal transcription of the human apoB gene: definition of the DNA-binding site of a tissue-specific transcriptional factor.

D Kardassis, M Hadzopoulou-Cladaras, D P Ramji, R Cortese, V I Zannis and C Cladaras

Department of Medicine, Housman Medical Research Center, Boston University Medical Center, Massachusetts 02118.

ABSTRACT

The promoter elements important for intestinal and hepatic transcription of the human apoB gene have been localized downstream of nucleotide -150. Footprinting analysis using hepatic nuclear extracts identified four protected regions, -124 to -100, -97 to -93, -86 to -33, and +33 to +52. Gel electrophoretic mobility shift assays showed that multiple factors interact with the apoB sequence -86 to -33, while the region -88 to -61 binds a single nuclear factor. Methylation interference analysis and nucleotide substitution mutagenesis identified the binding site of the factor between residues -78 and -68. Binding competition experiments indicate that this factor recognizes the regulatory elements of other liver-specific genes.


Mol Cell Biol. 1990 June; 10(6): 2653-2659




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