Electrostatic stabilization of a native protein structure in the gas phase.

Electrostatic stabilization of a native protein structure in the gas phase.
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DOI:
10.1002/anie.201005112
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发表时间:
2011-01-24
影响因子:
16.6
通讯作者:
Tollinger, Martin
Tollinger, Martin
中科院分区:
化学1区
文献类型:
--
作者:
Breuker, Kathrin;Brueschweiler, Sven;Tollinger, Martin

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最近,已经提出了一个一般的图片多久,在何种程度上,天然蛋白质结构可以保留在气相中。[1a]特别是,分子动力学模拟表明,盐桥和离子氢键的蛋白质表面上可以暂时稳定的全球折叠后不久,去溶剂化。[1b]然而,使用天然质谱[2]研究蛋白质溶液结构仍然存在争议,主要是因为特定地点的实验气相数据[3]很少。在这里,我们报告了三螺旋束蛋白KIX [5](图1)气相结构的电子捕获解离(ECD)[4]数据,表明在至少4 s的时间尺度上基本保留了天然溶液结构。我们证明,在气相中,最稳定的区域是那些稳定的盐桥和离子氢键。
Recently, a general picture has been proposed of how long, and to what extent, native protein structure can be retained in the gas phase.[1a] In particular, molecular dynamics simulations suggest that salt bridges and ionic hydrogen bonds on the protein surface can transiently stabilize the global fold shortly after desolvation.[1b] However, the use of native mass spectrometry [2] for studying protein solution structure is still controversial, mostly because site-specific experimental gasphase data [3] is scarce. Here we report electron capture dissociation (ECD)[4] data on the gas-phase structures of the three-helix bundle protein KIX [5](Figure1) that indicate substantial preservation of the native solution structure on a timescale of at least 4 s. We demonstrate that in the gas phase, the most stable regions are those stabilized by salt bridges and ionic hydrogen bonds.
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