Stealth carriers for low-resolution structure determination of membrane proteins in solution.

Stealth carriers for low-resolution structure determination of membrane proteins in solution.
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用于溶液中膜蛋白低分辨率结构测定的隐形载体。

DOI:
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发表时间:
2014
期刊:
Acta Crystallographica Section D: Biological Crystallography
影响因子:
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通讯作者:
Lise Arleth
Lise Arleth
中科院分区:
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文献类型:
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作者:
S. Maric;Nicholas Skar;S. Midtgaard;M. Thygesen;Jürgen Schiller;H. Frielinghaus;M. Moulin;M. Haertlein;V. T. Forsyth;T. Pomorski;Lise Arleth

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膜蛋白的结构研究仍然是一个巨大的实验挑战。功能性重构为模拟天然双层环境的人造纳米级双层盘载体,允许在溶液中处理膜蛋白。这使得能够使用小角度散射技术进行快速可靠的结构分析。这种方法的困难在于,承载盘以一种非常重要的方式对测量的散射强度产生影响,这使得后续的数据分析具有挑战性。这里,提出了一种巧妙的解决方案来规避因承载盘的存在而带来的固有复杂性。结合小角中子散射 (SANS) 和基于 D2O/H2O 的溶剂对比变化方法,证明可以制备特定的氘化载体,这些载体在 100% D2O 中在与 SANS 相关的长度尺度上对中子来说是不可见的。这些“隐形”载体盘可用作膜蛋白低分辨率结构研究的通用平台,使用最初为可溶性蛋白质开发的完善的数据分析工具。
Structural studies of membrane proteins remain a great experimental challenge. Functional reconstitution into artificial nanoscale bilayer disc carriers that mimic the native bilayer environment allows the handling of membrane proteins in solution. This enables the use of small-angle scattering techniques for fast and reliable structural analysis. The difficulty with this approach is that the carrier discs contribute to the measured scattering intensity in a highly nontrivial fashion, making subsequent data analysis challenging. Here, an elegant solution to circumvent the intrinsic complexity brought about by the presence of the carrier disc is presented. In combination with small-angle neutron scattering (SANS) and the D2O/H2O-based solvent contrast-variation method, it is demonstrated that it is possible to prepare specifically deuterated carriers that become invisible to neutrons in 100% D2O at the length scales relevant to SANS. These `stealth' carrier discs may be used as a general platform for low-resolution structural studies of membrane proteins using well established data-analysis tools originally developed for soluble proteins.
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