Using thioamides to site-specifically interrogate the dynamics of hydrogen bond formation in β-sheet folding.
Using thioamides to site-specifically interrogate the dynamics of hydrogen bond formation in β-sheet folding.
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DOI:
10.1021/ja301681v
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发表时间:
2012-05-16
影响因子:
15
通讯作者:
Gai, Feng
中科院分区:
文献类型:
--
作者:
Culik, Robert M.;Jo, Hyunil;DeGrado, William F.;Gai, Feng
Thioamides are sterically almost identical to their oxoamide counterparts, but are weaker hydrogen bond acceptors in comparison. Therefore, thioamide amino acids are excellent candidates for perturbing the energetics of backbone-backbone hydrogen bonds in proteins and hence should be useful in elucidating protein folding mechanisms in a site-specific manner. Herein, we validate this approach by applying it to probe the dynamic role of interstrand hydrogen bond formation in the folding kinetics of a well-studied β-hairpin, tryptophan zipper. Our results show that reducing the strength of the peptide’s backbone-backbone hydrogen bonds, except the one directly next to the β-turn, does not change the folding rate, suggesting that most native interstrand hydrogen bonds in β-hairpins are formed only after the folding transition state.
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DOI:
10.1073/pnas.1016685108
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