Differences in prion strain conformations result from non-native interactions in a nucleus.

Differences in prion strain conformations result from non-native interactions in a nucleus.
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DOI:
10.1038/nchembio.306
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发表时间:
2010-03
影响因子:
14.8
通讯作者:
Tanaka, Motomasa
Tanaka, Motomasa
中科院分区:
生物学1区
文献类型:
--
作者:
Ohhashi, Yumiko;Ito, Kazuki;Toyama, Brandon H.;Weissman, Jonathan S.;Tanaka, Motomasa

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聚集倾向蛋白质经常错误折叠成多种不同的淀粉样蛋白构象,决定了它们不同的生理影响。虽然淀粉样蛋白的形成是由一个短暂的细胞核触发的,但初始细胞核如何形成并允许蛋白质形成特定的淀粉样蛋白构象的机制仍不清楚。在这里,我们表明,在纤维形成之前,朊病毒结构域(Sup 35 NM,由残基1-254组成)的酵母朊病毒Sup 35,[PSI+]蛋白决定簇,以温度依赖性,可逆的方式形成寡聚体。突变和生物物理学分析表明,“非天然”芳香族相互作用的淀粉样蛋白核心驱动低聚物的形成,使不同的Sup 35 NM单体在一起,这特别是导致形成高感染性菌株构象与更有限的淀粉样蛋白核心。因此,在初始细胞核中的瞬时非天然相互作用在决定淀粉样蛋白构象的多样性和由此产生的朊病毒株表型中起着关键作用。
Aggregation-prone proteins often misfold into multiple distinct amyloid conformations dictating their different physiological impacts. Although amyloid formation is triggered by a transient nucleus, the mechanism of how an initial nucleus is formed and allows the protein to form a specific amyloid conformation remains unclear. Here we show that, prior to fiber formation, the prion domain (Sup35NM, consisting of residues 1-254) of yeast prion Sup35, the [PSI+] protein determinant, forms oligomers in a temperature-dependent, reversible manner. Mutational and biophysical analyses revealed that “nonnative” aromatic interactions outside of the amyloid core drive oligomer formation by bringing different Sup35NM monomers together, which specifically leads to the formation of highly infectious strain conformations with more limited amyloid cores. Thus, transient nonnative interactions in the initial nucleus play pivotal roles in determining the diversity of amyloid conformations and resulting prion strain phenotypes.
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