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- W2058690915 abstract "The UvrA protein is the initial damage-recognizing factor in bacterial nucleotide excision repair. Each monomer of the UvrA dimer contains two ATPase sites. Using single-molecule analysis we show that dimerization of UvrA in the presence of ATP is significantly higher than with ADP or nonhydrolyzable ATPγS, suggesting that the active UvrA dimer contains a mixture of ADP and ATP. We also show that the UvrA dimer has a high preference of binding the end of a linear DNA fragment, independent on the presence or type of cofactor. Apparently ATP binding or hydrolysis is not needed to discriminate between DNA ends and internal sites. A significant number of complexes could be detected where one UvrA dimer bridges two DNA ends implying the presence of two separate DNA-binding domains, most likely present in each monomer. On DNA containing a site-specific lesion the damage-specific binding is much higher than DNA-end binding, but only in the absence of cofactor or with ATP. With ATPγS no discrimination between a DNA end and a DNA damage could be observed. We present a model where damage recognition of UvrA depends on the ability of both UvrA monomers to interact with the DNA flanking the lesion." @default.
- W2058690915 created "2016-06-24" @default.
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- W2058690915 date "2009-02-10" @default.
- W2058690915 modified "2023-10-18" @default.
- W2058690915 title "Single-molecule analysis reveals two separate DNA-binding domains in the Escherichia coli UvrA dimer" @default.
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- W2058690915 doi "https://doi.org/10.1093/nar/gkp071" @default.
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