Directly monitor protein rearrangement on a nanosecond-to-millisecond time-scale.
Directly monitor protein rearrangement on a nanosecond-to-millisecond time-scale.
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DOI:
10.1038/s41598-017-08385-0
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发表时间:
2017-08-18
影响因子:
4.6
通讯作者:
Chen RP
中科院分区:
文献类型:
--
作者:
Chen EH;Lu TT;Hsu JC;Tseng YJ;Lim TS;Chen RP
In order to directly observe the refolding kinetics from a partially misfolded state to a native state in the bottom of the protein-folding funnel, we used a “caging” strategy to trap the β-sheet structure of ubiquitin in a misfolded conformation. We used molecular dynamics simulation to generate the cage-induced, misfolded structure and compared the structure of the misfolded ubiquitin with native ubiquitin. Using laser flash irradiation, the cage can be cleaved from the misfolded structure within one nanosecond, and we monitored the refolding kinetics of ubiquitin from this misfolded state to the native state by photoacoustic calorimetry and photothermal beam deflection techniques on nanosecond to millisecond timescales. Our results showed two refolding events in this refolding process. The fast event is shorter than 20 ns and corresponds to the instant collapse of ubiquitin upon cage release initiated by laser irradiation. The slow event is ~60 μs, derived from a structural rearrangement in β-sheet refolding. The event lasts 10 times longer than the timescale of β-hairpin formation for short peptides as monitored by temperature jump, suggesting that rearrangement of a β-sheet structure from a misfolded state to its native state requires more time than ab initio folding of a β-sheet.
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DOI:
10.1073/pnas.0407982102
发表时间:
2005-02-22
影响因子:
11.1
作者:
Kimura, T;Uzawa, T;Fujisawa, T
通讯作者:
Fujisawa, T
影响因子:
4.1
作者:
HALFORD, SE
通讯作者:
HALFORD, SE
影响因子:
64.8
作者:
MINOR, DL;KIM, PS
通讯作者:
KIM, PS
影响因子:
3.3
作者:
Xu, Yao;Du, Deguo;Oyola, Rolando
通讯作者:
Oyola, Rolando
影响因子:
4.9
作者:
Huang, Joseph Jen-Tse;Larsen, Randy W.;Chan, Sunney I.
通讯作者:
Chan, Sunney I.