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• W2020377141 abstract "In an attempt to understand the role of ATP as a cofactor at the interaction of the RecA protein with DNA, we have studied the orientation geometries of the cofactor analogs adenosine 5'-O-(3-thiotriphosphate) (ATP gamma S) and guanosine 5'-O-(3-thiotriphosphate) (GTP gamma S) in RecA-DNA complexes using flow linear dichroism spectroscopy. Both cofactors promote the formation of RecA-DNA complexes of similar structure as judged from similar orientations of DNA bases. The DNA orientation was probed through the dichroism of the long-wavelength absorption of a DNA analog, poly(d epsilon A). In this way differences between the dichroic spectra of the ATP gamma S-RecA-DNA and GTP gamma S-RecA-DNA complexes, observed in the shorter-wavelength region, are related to orientation at variations of the cofactor chromophores. The results show that the guanine plane of GTP gamma S is oriented parallel with the principal axis of the complex in contrast to the more perpendicular orientation of the DNA bases. This observation directly excludes the possibility that the cofactor could be intercalated between the DNA bases. The orientation of the adenine base of ATP gamma S, which may be similar to that of guanine of GTP gamma S albeit not exactly the same, is also inconsistent with intercalation. The possibility that the cofactor bound to the protein could be intercalated in DNA had been speculated from the observation that some DNA intercalators can induce RecA binding to DNA in the absence of cofactor.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W2020377141 date "1994-09-01" @default.
• W2020377141 modified "2023-09-25" @default.
• W2020377141 title "The cofactor ATP in DNA-RecA complexes is not intercalated between DNA bases" @default.
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• W2020377141 doi "https://doi.org/10.1002/jmr.300070311" @default.
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