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- W2100039265 abstract "Single-chain derivatives of the 434 repressor containing one wild-type and one mutant DNA-binding domain recognize the general operator ACAA-6 base pairs-NNNN, where the ACAA operator subsite is contacted by the wild-type and the NNNN tetramer by the mutant domain. The DNA-binding specificities of several single-chain mutants were studied in detail and the optimal subsites of the mutant domains were determined. The characterized mutant domains were used as building units to obtain homo- and heterodimeric single-chain derivatives. The DNA-binding properties of these domain-shuffled derivatives were tested with a series of designed operators of NNNN-6 base pairs-NNNN type. It was found that the binding specificities of the mutant domains were generally maintained in the new environments and the binding affinities for the optimal DNA ligands were high (with K(d) values in the range of 10(-11)-10(-10) M). Considering that only certain sequence motifs in place of the six base pair spacer can support optimal contacts between the mutant domains and their subsites, the single-chain 434 repressor mutants are highly specific for a limited subset of 14 base pair long DNA targets." @default.
- W2100039265 created "2016-06-24" @default.
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- W2100039265 date "2001-08-01" @default.
- W2100039265 modified "2023-10-03" @default.
- W2100039265 title "Modular construction of extended DNA recognition surfaces: mutant DNA-binding domains of the 434 repressor as building blocks" @default.
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- W2100039265 doi "https://doi.org/10.1093/protein/14.8.591" @default.
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