The binding of UvrAB proteins to bubble and loop regions in duplex DNA

被引:24
作者
Ahn, BC [1 ]
Grossman, L [1 ]
机构
[1] JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT BIOCHEM,BALTIMORE,MD 21205
关键词
D O I
10.1074/jbc.271.35.21462
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Based on the binding of the UvrAB complex to a promoter region in transcription open complexes (Ahn, B., and Grossman, L, (1996) J. Biol. Chem. 271, 21453-21461) and the requirement of a single-stranded region for UVrAB helicase activity, we examined the binding of UvrAB proteins to synthetic bubble or loop regions in duplex DNA and the role of these regions in translocation of the UvrAB complex as well as incision of DNA damage. We found that the UvrAB complex was able to bind to bubble and loop regions with an affinity similar to that for damaged DNA in the absence of RNAP. The preferential recognition and incision of damaged sites by the UvAB complex was observed downstream of the bubble or loop region in the strand complementary to the strand along which the UVrAB complex translocates. These results imply that the bubble region generated in duplex DNA by RNAP serves as a preferred entry site for the translocation of the UvrAB complex, and that preferential binding and unidirectional translocation of the UvrAB complex predetermine where incision is to occur.
引用
收藏
页码:21462 / 21470
页数:9
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