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. 1987 Apr;84(7):1764–1768. doi: 10.1073/pnas.84.7.1764

Evidence for altered DNA conformations in the simian virus 40 genome: site-specific DNA cleavage by the chiral complex lambda-tris(4,7-diphenyl-1,10-phenanthroline)cobalt(III).

B C Müller, A L Raphael, J K Barton
PMCID: PMC304521  PMID: 3031649

Abstract

lambda-Tris(4,7-diphenyl-1,10-phenanthroline)cobalt(III), a photoactivated DNA-cleaving agent, is a small molecular probe of DNA structure. Because of its chirality, the complex cannot bind to regular right-handed B-form DNA but exhibits site-specific cleavage along the polymer strand at conformationally distinct sites such as those in a left-handed conformation. Both coarse and higher resolution mapping experiments using the chiral cobalt complex indicate intriguing conformational variations along the simian virus 40 genome. Highly specific cleavage is evident in the enhancer and promoter blocks and in the region downstream of 3' termini. A specific cleavage pattern borders an alternating purine/pyrimidine stretch within the enhancer, which was found earlier to bind anti-Z-DNA antibodies. Throughout the simian virus 40 genome, variations in structure delineated with the cobalt complex appear to correlate with regions important for control of gene expression.

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