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- W2022328036 abstract "The DNA-binding domain of c-Myb consists of three imperfect tandem repeats, R1, R2, and R3. Each repeat contains three helices. The minimal DNA-binding domain is an R2R3 fragment. Here, we have examined the backbone dynamics of R2R3 in its DNA-bound form by NMR. Upon binding to DNA, the N- and C-termini, and the linker between R2 and R3 become less flexible. In the free form the third helix of R2 exhibits slow conformational exchange fluctuations owing to a cavity in the hydrophobic core of R2. Upon binding to DNA, the conformational exchange contributions in R2 are reduced but remain significant in NMR relaxation measurements. Upon binding to DNA, the third helix of R3 comes to exhibit significant chemical exchange contributions. These findings suggest that the orientations of the third helices of both R2 and R3 as to DNA are being chemically exchanged. In the DNA-bound form both R2 and R3 exhibit similar dynamical characters, except for amino acids Trp 95, Thr 96, and Val 103 of R2, which are located around the cavity of the unbound form. Upon binding to DNA, since Trp 95 moves into the cavity to fill it up, the local conformational exchange contributions seem to be still observable around the filled cavity." @default.
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- W2022328036 date "2000-06-01" @default.
- W2022328036 modified "2023-09-26" @default.
- W2022328036 title "Backbone Dynamics of the c-Myb DNA-Binding Domain Complexed with a Specific DNA" @default.
- W2022328036 doi "https://doi.org/10.1093/oxfordjournals.jbchem.a022710" @default.
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