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- W2066663194 abstract "The sequence of non-contacted bases at the center of the 434 repressor binding site affects the strength of the repressor-DNA complex by influencing the structure and flexibility of DNA (Koudelka, G. B., and Carlson, P. (1992) Nature355, 89–91). We synthesized 434 repressor binding sites that differ in their central sequence base composition to test the importance of minor groove substituents and/or the number of base pair hydrogen bonds between these base pairs on DNA structure and strength of the repressor-DNA complex. We show here that the number of base pair H-bonds between the central bases apparently has no role in determining the relative affinity of a DNA site for repressor. Instead we find that the affinity of DNA for repressor depends on the absence or presence the N2-NH2 group on the purine bases at the binding site center. The N2-NH2 group on bases at the center of the 434 binding site appears to destabilize 434 repressor-DNA complexes by decreasing the intimacy of the specific repressor-DNA contacts, while increasing the reliance on protein contacts to the DNA phosphate backbone. Thus, the presence of an N2-NH2 group on the purines at the center of a binding site globally alters the precise conformation of the protein-DNA interface." @default.
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- W2066663194 date "2003-04-01" @default.
- W2066663194 modified "2023-09-29" @default.
- W2066663194 title "The Role of the Minor Groove Substituents in Indirect Readout of DNA Sequence by 434 Repressor" @default.
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- W2066663194 doi "https://doi.org/10.1074/jbc.m212667200" @default.
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