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. 1992 Oct;11(10):3663–3671. doi: 10.1002/j.1460-2075.1992.tb05451.x

Two regulatory proteins that bind to the basic transcription element (BTE), a GC box sequence in the promoter region of the rat P-4501A1 gene.

H Imataka 1, K Sogawa 1, K Yasumoto 1, Y Kikuchi 1, K Sasano 1, A Kobayashi 1, M Hayami 1, Y Fujii-Kuriyama 1
PMCID: PMC556826  PMID: 1356762

Abstract

The cDNAs for two DNA binding proteins of BTE, a GC box sequence in the promoter region of the P-450IA1(CYP1A1) gene, have been isolated from a rat liver cDNA library by using the BTE sequence as a binding probe. While one is for the rat equivalent to human Sp1, the other encodes a primary structure of 244 amino acids, a novel DNA binding protein designated BTEB. Both proteins contain a zinc finger domain of Cys-Cys/His-His motif that is repeated three times with sequence similarity of 72% to each other, otherwise they share little or no similarity. The function of BTEB was analysed by transfection of plasmids expressing BTEB and/or Sp1 with appropriate reporter plasmids into a monkey cell line CV-1 and compared with Sp1. BTEB and Sp1 activated the expression of genes with repeated GC box sequences in promoters such as the simian virus 40 early promoter and the human immunodeficiency virus-1 long terminal repeat promoter. In contrast, BTEB repressed the activity of a promoter containing BTE, a single GC box of the CYP1A1 gene that is stimulated by Sp1. When the BTE sequence was repeated five times, however, BTEB turned out to be an activator of the promoter. RNA blot analysis showed that mRNAs for BTEB and Sp1 were expressed in all tissues tested, but their concentrations varied independently in tissues. The former mRNA was rich in the brain, kidney, lung and testis, while the latter was relatively abundant in the thymus and spleen.(ABSTRACT TRUNCATED AT 250 WORDS)

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