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• W1977196941 abstract "Exposing native calf thymus DNA to increasing concentrations of Hg(ClO4)2 not only produces dramatic changes in its circular dichroism (CD) but results also in the decrease, and ultimate cessation, of endonucleolytic DNA cleavage by staphylococcal nuclease. Let r = [moles of added Hg(II)]/[mole of DNA base]: the conservative CD spectrum of the DNA B-form becomes nonconservative in appearance at 0.01 less than r less than 0.12 (resembling DNA in C-form geometry) and assumes the spectral characteristics of a left-handed DNA double helix at 0.12 less than r less than or equal to 1.0. DNA cleavage proceeds at or near the rates exhibited by untreated DNA at 0 less than r less than 0.08. At Hg(II) levels of 0.08 less than r less than 0.5, the rate of DNA hydrolysis decreases monotonically with increasing Hg(II) concentrations, and at r greater than 0.4, DNA cleavage ceases. Both the CD changes and the changes in the rate of DNA digestion are totally reversible upon the removal of Hg(II), at least up to r = 1.0, demonstrating that Hg(II) keeps all base pairs in register. For comparison purposes, native calf thymus DNA was also treated with methylmercury [CH3Hg(II)], an agent known to disrupt the secondary structure of DNA. The treatment yielded single-stranded methylmercurated DNA with preserved right-handed helix screwness. In addition, this DNA is digested by staphylococcal nuclease much more rapidly than double-stranded control DNA. Lastly, neither the CD nor the cleavage rate changes are reversible upon the removal of methylmercury.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W1977196941 created "2016-06-24" @default.
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• W1977196941 date "1990-02-27" @default.
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• W1977196941 title "Mercury-induced DNA polymorphism: probing the conformation of mercury(II)-DNA via staphylococcal nuclease digestion and circular dichroism measurements" @default.
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• W1977196941 doi "https://doi.org/10.1021/bi00460a021" @default.
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