Peptide conformational preferences in osmolyte solutions: transfer free energies of decaalanine.
Peptide conformational preferences in osmolyte solutions: transfer free energies of decaalanine.
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DOI:
10.1021/ja1078128
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发表时间:
2011-02-16
影响因子:
15
通讯作者:
Pettitt BM
中科院分区:
文献类型:
--
作者:
Kokubo H;Hu CY;Pettitt BM
The nature in which the protecting osmolyte trimethylamine-N-oxide (TMAO) and the denaturing osmolyte urea affect protein stability is investigated simulating a deca-alanine peptide model in multiple conformations of the denatured ensemble. Binary solutions of both osmolytes and mixed osmolyte solutions at physiologically-relevant concentrations of 2:1 (urea:TMAO) are studied using standard molecular dynamics simulations and solvation free energy calculations. Component analysis reveals the differences in the importance of the van der Waals (vdW) and electrostatic interactions for protecting and denaturing osmolytes. We find that urea denaturation governed by transfer free energy differences is dominated by vdW attractions, whereas TMAO exerts its effect by causing unfavorable electrostatic interactions both in the binary solution and mixed osmolyte solution. Analysis of the results showed no evidence in the ternary solution of disruption of the correlations among the peptide and osmolytes, nor of significant changes in the strength of the water hydrogen bond network.
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影响因子:
2.8
作者:
BEUTLER, TC;MARK, AE;VANGUNSTEREN, WF
通讯作者:
VANGUNSTEREN, WF
DOI:
10.1073/pnas.0812588106
发表时间:
2009-02-24
影响因子:
11.1
作者:
Lim, Woon Ki;Rosgen, Jorg;Englander, S. Walter
通讯作者:
Englander, S. Walter
影响因子:
4.4
作者:
Fukunishi, H;Watanabe, O;Takada, S
通讯作者:
Takada, S
影响因子:
8
作者:
Hu, Char Y.;Kokubo, Hironori;Pettitt, B. Montgomery
通讯作者:
Pettitt, B. Montgomery
影响因子:
3.3
作者:
Das, Atanu;Mukhopadhyay, Chaitali
通讯作者:
Mukhopadhyay, Chaitali