Submillisecond folding of the peripheral subunit-binding domain.

Submillisecond folding of the peripheral subunit-binding domain.
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外周亚基结合域的亚毫秒折叠。

DOI:
10.1006/jmbi.1999.3189
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发表时间:
1999
期刊:
Journal of molecular biology.
影响因子:
--
通讯作者:
Raleigh,DP
Raleigh,DP
中科院分区:
--
文献类型:
--
作者:
Spector,S;Raleigh,DP

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已经测量了外周亚单位结合域的折叠和去折叠速率,这是一种小的三螺旋蛋白质。这种蛋白质折叠得非常快,速度太快,无法用传统的停流技术进行测量。利用动态核磁共振线型分析,测量了折叠和去折叠速率作为温度的函数。在有足够展宽测量速率的最低温度41°C,折叠速率为16,050 S−1。因此,折叠所需的半衰期为43μS。在相同温度下,展开速率为2,800 S−1。使用来自环中的Val16和310-螺旋末端的Val21的分辨共振测量相同的速率。折叠速度与蛋白质拓扑结构有关,这种相关性与外周亚基结合结构域的快速折叠一致。这里提出的结果表明,外周亚基结合结构域是第三快的折叠蛋白质,其速率已被估计。折叠速度是直接测量到的最快的,这进一步支持了链拓扑作为折叠速度的主要决定因素的重要性。
Folding and unfolding rates have been measured for the peripheral subunit-binding domain, a small three-helix protein. The protein folds very fast, with rates too rapid to be measured using traditional stopped-flow techniques. Folding and unfolding rates were measured as a function of temperature using dynamic NMR lineshape analysis. At the lowest temperature at which there is sufficient broadening to measure rates, 41°C, the folding rate is 16,050 s−1. Thus, the halftime required for folding is 43 μs. At the same temperature, the unfolding rate is 2800 s−1. Identical rates were measured using resolved resonances from Val16 in the loop and Val21 at the end of the 310-helix. Folding rates have been correlated with protein topology, and this correlation is consistent with the rapid folding of the peripheral subunit-binding domain. The results presented here show that the peripheral subunit-binding domain is the third fastest folding protein for which rates have been estimated. The folding rate is the fastest that has been directly measured and provides further support for the importance of chain topology as a major determinant of folding rates.
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