Modification of Deoxyribonucleic Acid with Reductively Activated Mitomycin C. Structures of Modified Nucleotides

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概要

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• Mitomycin C (MMC) binds to deoxyribonucleic acid (DNA) after its reductive activation by catalytic hydrogenation with Pd on charcoal. Three modified nucleotides, named MG-1,MG-2 and MA, were isolated and purified by high performance liquid chromatography (HPLC) from the modified DNA after enzymatic hydrolysis to 5'-nucleotides with nuclease P1. Analysis of the proton nuclear magnetic resonance (^1H-NMR) and ultraviolet (UV) spectra, and studies of the acid and enzymatic hydrolysates of these modified nucleotides suggested that MG-1 and MG-2 are deoxyguanylic acid-MMC adducts bound at position 1 of mitosene and a heteroatom of the guanine moiety. Analogous binding to an adenine moiety is proposed for the adduct, MA. Chemical transformations (methylation, diazotization and thioketonization) were used to unambiguously determine the binding sites of the purine bases. The binding sites were identified as the N^2 atom of guanine for MG-1,the O^6 atom of guanine for MG-2,and the N^6 atom of adenine for MA. Thus, these three modified nucleotides were concluded to be 1,2-trans-2,7-diamino-1-(N^2-deoxyguanylyl) mitosene (MG-1), 2,7-diamino-1-(O^6-deoxyguanylyl) mitosene (MG-2), and 2,7-diamino-1-(N^6-deoxyadenylyl) mitosene (MA). These same modified nucleotides were identified in DNA extracted from the livers of rats treated with MMC.

• 1983-03-25

著者

• 岡本 敏彦

  Faculty of Pharmaceutical Sciences, University of Tokyo

• 首藤 紘一

  Faculty of Pharmaceutical Sciences, University of Tokyo

• 首藤 紘一

  Facutly Of Pharmaceutical Sciences University Of Tokyo

• 岡本 敏彦

  Faculty Of Pharmaceutical Sciences University Of Tokyo

• 橋本 祐一

  Faculty of Pharmaceutical Sciences, University of Tokyo

• 首藤 紘一

  東京大・薬学

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