On the Mechanism of Radiation Induced Reduction of Cytochrome C

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概要

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• Kinetic investigations for reduction of cytochrome c in aqueous solution induced by cobalt-60 gamma rays have been carried out. Initial reduction yield of cytochrome c is about 5 as limiting value. The decrease in initial reduction yield in presence of thallous ion as a radical scavenger with ferricytochrome c provides some evidences that OH radicals can contribute to reduction through some possible intermediate. The effects of concentration ratio in ferro-ferricytochrome c and thallous ion-ferricytochrome c systems on initial reduction yield were investigated. The results can be explained on the basis of some reaction scheme based on the contribution of OH radicals to reduction of ferricytochrome c. The following rate constants were determined by kinetic treatment of the results. k_<OH+RH2Fe1+>=5×10^<10>M^<-1>sec^<-1> k_<OH+RH2Fe2+>=4.1×10^<10>M^<-1>sec^<-1>.

• 日本放射線影響学会の論文

著者

• 増田 高広

  東京都立大学理学部化学科

• 近藤 正春

  東京都立大学理学部化学科

• 増田 高広

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

• 近藤 正春

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

• 松田 日吉

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

• 松田 日吉

  Department Of Chemistry Faculty Of Science Tokyo Metropolitan University

関連論文

• Reactions of Dichioride Anion Radicals with Pyrimidine and its Derivatives
• Reactions of Hydroxyl Radicals with Nucleic Acid Bases and the Related Compounds in Gamma-irradiated Aqueous Solution
• Reactions of Dichioride Anion Radicals with Aliphatic Peptides in Aqueous Solutions
• Reacttvlty of Cl2- Radical Toward Aliphatic Amino Acids
• Reactivity of Nucleotides and Polynucleotides Toward Hydroxyl Radical in Aqueous Solution
• A Mechanism of Direct Photoreduction of Ferricytochrome c
• Reactivity of Glycyl-Amino Acids Toward Hydroxyl Radical in Neutral Aqueous Solutions
• Photoreduction of Ferricvtcchrome C in the Presence and Absence of Electron-Donor
• Transient Absorptions over the Range 600-800 nm Observed in Flash-Photolysis of Aqueous Solutions of Indole
• Reactivity of Nucleosides Toward Hydroxyl Radicals in Aqueous Solution
• Reactivity of Aliphatic Peptides toward Hydroxyl Radicals in Aqueous Solution
• Partial Reactivities Observed in the Hydrogen Abstraction Reactions of Hydroxyl Radicals from Aliphatic Amino Acids
• Reactivities of Enzymes toward Hydroxyl Radicals
• Rate Constants for the Reactions of OH Radicals with the Enzyme Proteins as Determined by the p-Nitrosodimethylaniline Method
• Conformational Degradation of Cytochrome-C by Gamma Irradiation in Aqueous Solution
• Radiation-Induced Decoloration of Dyestuffs in Aqueous Solution
• On the Mechanism of Radiation Induced Reduction of Cytochrome C
• 放射線の線量測定 : 化学的および光学的方法

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