A cluster of four Sp1 binding sites required for efficient expression of the human insulin receptor gene

Fragments of 5'-flanking sequences of the human insulin receptor gene were analyzed in transient expression assays after transfection of cell lines with expression assays after transfection of cell lines with an improved low background chloramphenicol acetyl-transferase vector system pSVOOCAT (...

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Bibliographic Details
Published in:The Journal of biological chemistry 1991-02, Vol.266 (6), p.3944-3948
Main Authors: Araki, E, Murakami, T, Shirotani, T, Kanai, F, Shinohara, Y, Shimada, F, Mori, M, Shichiri, M, Ebina, Y
Format: Article
Language:English
Subjects:
Animals
Base Sequence
Binding Sites
Biological and medical sciences
Cells, Cultured
Chimera
Chloramphenicol O-Acetyltransferase - genetics
Cricetinae
Cricetulus
Electrophoresis, Agar Gel
Fundamental and applied biological sciences. Psychology
Gene Expression
genes
Humans
Molecular and cellular biology
Molecular genetics
Molecular Sequence Data
Plasmids
Promoter Regions, Genetic
Receptor, Insulin - genetics
Sp1 protein
Transcription, Genetic
Transcription. Transcription factor. Splicing. Rna processing
Transfection
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Summary:Fragments of 5'-flanking sequences of the human insulin receptor gene were analyzed in transient expression assays after transfection of cell lines with expression assays after transfection of cell lines with an improved low background chloramphenicol acetyl-transferase vector system pSVOOCAT (Araki, E., Shimada, F., Shichiri, M., Mori, M., and Ebina, Y. (1988) Nucleic Acids Res. 16, 1627). Transfection of chimeric chloramphenicol acetyltransferase plasmids containing various deletions and insertions of the promoter of HIR gene into CHO and COS cells indicated that the region between -629 and -1 (initiator ATG is +1) is sufficient for maximal promoter activity. The DNA element of the cluster of four G-C boxes (-593 to -618) enhanced the transcription, examined by the low background pSVOOCAT vector system in vivo. DNase I footprinting and gel retardation experiments using partially purified LacZ-Sp1 hybrid proteins showed that the transcription factor Sp1 can bind to the cluster of the four G-C boxes of the promoter. Thus, the efficient expression of the human insulin receptor gene possibly requires the binding of transcriptional factor Sp1 to four G-C boxes located -593 to -618 base pairs upstream of the ATG translation initiation codon.
ISSN:0021-9258
1083-351X
DOI:10.1016/S0021-9258(19)67884-1