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竹红菌甲素敏化质粒pBR 322 DNA光氧化——使封闭环DNA转变为开环DNA

Hypocrellin A-sensitized Pnotooxidation of pBR 322 DNA Resulting in Strand Scission to Open Circular DNA

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【作者】 贾弘(礻是)付毅平董苍玉

【Author】 Jia, Hong-ti Fu, Yi-ping Dong, Caug-yu(Department of Biochemistry, Beijing Medical University, Beijing)

【机构】 北京医科大学生物化学教研室北京医科大学基础医学专业北京医科大学生物化学教研室 北京82级学生北京

【摘要】 甲素可敏化质粒pBR 322 DNA光氧化断链的使其封闭环DNA转变为开环DNA。甲素敏化pBR 322 DNA光氧化反应可被单线态氧淬灭剂-NaN3抑制,证明此光敏氧化机制属Ⅱ型过程。

【Abstract】 The photooxidation of pBR 322 DNA sensitized by Hypocrellin A resulted in the conversion of closed circular DNA to open circular DNA. This result showed that strand scission of pBR 322 DNA might occur in this photooxidation. Singlet oxgen quencher-NaN3 could protect DNA from strand scission suggesting that Type Ⅱ process was involved in Hypocrellin A-sensitized photooxidation of pBR 322 DNA.

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