Photochemistry of DNA using 193 nm excimer laser radiation.

Photochemistry of DNA using 193 nm excimer laser radiation.
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使用 193 nm 准分子激光辐射进行 DNA 光化学。

DOI:
10.1111/j.1751-1097.1990.tb01961.x
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发表时间:
1990
影响因子:
3.3
通讯作者:
Buckley,LA
Buckley,LA
中科院分区:
生物学3区
文献类型:
--
作者:
Kochevar,IE;Buckley,LA

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Photoproducts in double‐stranded DNA induced by 193 nm radiation have been investigated. Double‐stranded, supercoiled pBR322 DNA in buffered aqueous solution was exposed to varying fluences of 193 nm radiation from an ArF excimer laser. The quantum yields for formation of cyclobutylpyrimidine dimers, frank strand breaks and alkali labile sites were calculated from the conversion of supercoiled (Form I) DNA to relaxed (Form II) DNA after treatment withMicrococcus luteusdimer‐specific endonuclease, no treatment, or treatment with alkali and heat, respectively. The quantum yields were 1.65 (± 0.03) × 10−3for pyrimidine dimers, 9.4 (± 3.2) × 10−5for frank strand breaks and 9.6 (± 3.6) × 10−5for alkali labile sites. The quantum yields for pyrimidine dimers and frank strand breaks were independent of Tris buffer and EDTA concentrations. The yields of frank strand breaks and alkali labile sites were not affected by 10mMmannitol. The relative quantum yields for these DNA photoproducts induced by 193 nm radiation differed markedly from those produced by 254 nm radiation.
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