The mechanism of denaturation and the unfolded state of the α-helical membrane-associated protein Mistic.

The mechanism of denaturation and the unfolded state of the α-helical membrane-associated protein Mistic.
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α螺旋膜相关蛋白Mistic的变性机制和展开状态

DOI:
10.1021/ja408644f
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发表时间:
2013
影响因子:
15
通讯作者:
Reif B
Reif B
中科院分区:
化学1区
文献类型:
--
作者:
Jacso T;Bardiaux B;Broecker J;Fiedler S;Barwinkel T;Mainz A;Fink U;Vargas C;Oschkinat H;Keller S;Reif B

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在体外蛋白质折叠研究中,使用化学变性剂,如尿素,对于阐明决定水溶性蛋白质稳定性、结构和动力学的力和机制是不可或缺的。相比之下,α螺旋膜相关蛋白在很大程度上避免了这种方法,因为它们对广泛的展开具有弹性。我们使用光学和核磁共振光谱在原子水平上剖析了尿素对α螺旋膜相关蛋白的结构和动力学的影响,以及它与洗涤剂和溶剂分子的相互作用。在两性离子洗涤剂十二烷基二甲胺氧化物的存在下,尿素浓度的增加会导致一系列复杂的构象变化,而不仅仅是简单的两态展开。利用这一发现,我们首次报道了α螺旋膜相关蛋白的尿素变性过程及其完全未折叠状态的高分辨率结构模型,该状态几乎不包含规则的二级结构,但仍保持接近折叠状态的拓扑结构。
In vitroprotein-folding studies using chemical denaturants such as urea are indispensible in elucidating the forces and mechanisms determining the stability, structure, and dynamics of water-soluble proteins. By contrast, α-helical membrane-associated proteins largely evade such approaches because they are resilient to extensive unfolding. We have used optical and NMR spectroscopy to provide an atomistic-level dissection of the effects of urea on the structure and dynamics of the α-helical membrane-associated protein Mistic as well as its interactions with detergent and solvent molecules. In the presence of the zwitterionic detergent lauryl dimethylamine oxide, increasing concentrations of urea result in a complex sequence of conformational changes that go beyond simple two-state unfolding. Exploiting this finding, we report the first high-resolution structural models of the urea denaturation process of an α-helical membrane-associated protein and its completely unfolded state, which contains almost no regular secondary structure but nevertheless retains a topology close to that of the folded state.
DOI: 10.1021/la4013747
发表时间: 2013-07-09
期刊: LANGMUIR
影响因子: 3.9
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