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
Gai, Feng
中科院分区:
化学1区
文献类型:
--
作者:
Culik, Robert M.;Jo, Hyunil;DeGrado, William F.;Gai, Feng

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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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