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. 1996 Feb 15;314(Pt 1):293–296. doi: 10.1042/bj3140293

Single-strand-DNA-binding factors specifically recognize the pyrimidine element in the chick alpha2(I) collagen gene promoter.

D Bayarsaihan 1, L N Lukens 1
PMCID: PMC1217039  PMID: 8660297

Abstract

A pyrimidine element with mirror repeats centered at position -192 bp of the chick alpha2(I) collagen promoter interacts with sequence-specific DNA-binding factors. These factors bind to only the pyrimidine strand of this region and have no affinity for the complementary purine strand. Binding activity is also seen with the double-stranded form of this element, but with less affinity than to the single-stranded pyrimidine species. Southwestern blot analyses have shown that proteins of 80 and 134 kDa in chick embryo fibroblast nuclear-extracts bind to the pyrimidine strand, whereas only a 134 kDa DNA-binding protein was found in chondrocyte nuclear extracts. The binding mechanism of these nuclear proteins with single-stranded DNA might be based on a non-B-DNA conformation of the pyrimidine element. The position of this binding site in the promoter region, its potential for adopting an unusual secondary structure and the presence of the 80 kDa binding factor in chick embryo fibroblasts, but not in chondrocytes, suggest a possible role for this factor in the expression of the alpha2(I) collagen gene.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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