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- W2017764675 abstract "Rapid recognition of DNA target sites involves facilitated diffusion through which alternative sites are searched on genomic DNA. A key mechanism facilitating the localization of the target by a DNA-binding protein (DBP) is one-dimensional diffusion (sliding) in which electrostatic forces attract the protein to the DNA. As the protein reaches its target DNA site, it switches from purely electrostatic binding to a specific set of interactions with the DNA bases that also involves hydrogen bonding and van der Waals forces. High overlap between the DBP patches used for nonspecific and specific interactions with DNA may enable an immediate transition between the two binding modes following target site localization. By contrast, an imperfect overlap may result in greater frustration between the two potentially competing binding modes and consequently slower switching between them. A structural analysis of 125 DBPs indicates frustration between the two binding modes that results in a large difference between the orientations of the protein to the DNA when it slides compared to when it specifically interacts with DNA. Coarse-grained molecular dynamics simulations of in silico designed peptides comprising the full range of frustrations between the two interfaces show slower transition from nonspecific to specific DNA binding as the overlap between the patches involved in the two binding modes decreases. The complex search kinetics may regulate the search by eliminating trapping of the protein in semispecific sites while sliding." @default.
- W2017764675 created "2016-06-24" @default.
- W2017764675 creator A5054904960 @default.
- W2017764675 creator A5066579719 @default.
- W2017764675 date "2011-10-14" @default.
- W2017764675 modified "2023-10-03" @default.
- W2017764675 title "Frustration in protein–DNA binding influences conformational switching and target search kinetics" @default.
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- W2017764675 doi "https://doi.org/10.1073/pnas.1109594108" @default.
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