Single-molecule fluorescence experiments determine protein folding transition path times.
Single-molecule fluorescence experiments determine protein folding transition path times.
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DOI:
10.1126/science.1215768
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发表时间:
2012-02-24
期刊:
影响因子:
--
通讯作者:
Eaton WA
中科院分区:
文献类型:
--
作者:
Chung HS;McHale K;Louis JM;Eaton WA
The transition path is the tiny fraction of an equilibrium molecular trajectory when a transition occurs by crossing the free-energy barrier between two states. It is a single-molecule property that contains all the mechanistic information on how a process occurs. As a step toward observing transition paths in protein folding we determined the average transition-path time for a fast- and a slow-folding protein from a photon-by-photon analysis of fluorescence trajectories in single-molecule Förster-resonance-energy-transfer experiments. While the folding rate coefficients differ by a factor of 10,000, the transition-path times differ by less than a factor of 5, showing that a fast-and a slow-folding protein take almost the same time to fold when folding actually happens. A very simple model based on energy landscape theory can explain this result.
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