Disordered Protein Diffusion under Crowded Conditions.

Disordered Protein Diffusion under Crowded Conditions.
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DOI:
10.1021/jz3010915
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发表时间:
2012-09-20
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Pielak GJ
Pielak GJ
中科院分区:
其他
文献类型:
--
作者:
Wang Y;Benton LA;Singh V;Pielak GJ

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内含子无序蛋白在信号传导、调节和易位中是重要的。了解它们在生理相关条件下的扩散将有助于深入了解它们的功能。我们用核磁共振定量的球状和无序的蛋白质在稀溶液中的平移扩散和拥挤的条件下。在稀溶液中,球状蛋白糜蛋白酶抑制剂2(CI 2,7.4kDa)比无序蛋白α-突触核蛋白(14 kDa)扩散更快。令人惊讶的是,在拥挤的条件下发生相反的情况; α-突触核蛋白比CI 2扩散得更快,即使α-突触核蛋白比CI 2大。这些数据表明,形状是决定蛋白质扩散拥挤的条件下,增加了已知的大分子拥挤的影响的属性的关键参数。这些结果也提供了一条线索,解释为什么许多信号蛋白是无序的。
Intrinsically disordered proteins are important in signaling, regulation, and translocation. Understanding their diffusion under physiologically relevant conditions will yield insight into their functions. We used NMR to quantify the translational diffusion of a globular and a disordered protein in dilute solution and under crowded conditions. In dilute solution, the globular protein chymotrypsin inhibitor 2 (CI2, 7.4 kDa) diffuses faster than the disordered protein α-synuclein (14 kDa). Surprisingly, the opposite occurs under crowded conditions; α-synuclein diffuses faster than CI2, even though α-synuclein is larger than CI2. These data show that shape is a key parameter determining protein diffusion under crowded conditions, adding to the properties known to be affected by macromolecular crowding. The results also offer a clue about why many signaling proteins are disordered.
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