Optical trapping with high forces reveals unexpected behaviors of prion fibrils.

Optical trapping with high forces reveals unexpected behaviors of prion fibrils.
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DOI:
10.1038/nsmb.1954
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发表时间:
2010-12
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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淀粉样原纤维在多种细胞功能中起重要作用,在许多人类疾病中具有特征,并且在纳米技术中具有潜在的应用。在这里,我们开发的方法,结合联合收割机的光学捕获和荧光成像的特点的力量,管理的完整性淀粉样纤维形成的酵母朊病毒蛋白。一个关键的进展是利用淀粉样蛋白的自模板特性来束缚朊病毒原纤维,使它们能够在光学陷阱中进行操纵。在正常的拉力下,原纤维不受破坏。在高得多的力(高达250 pN),不连续性发生在原纤维断裂之前的力延伸的痕迹。选择性淀粉样蛋白破坏剂和突变表明,这种不连续性是由个别亚结构域的解折叠引起的。因此,我们的研究结果揭示了异常强大的非共价分子间的接触,保持原纤维的完整性,即使个别单体部分展开和延长原纤维长度。
Amyloid fibrils are important in diverse cellular functions, feature in many human diseases and have potential applications in nanotechnology. Here we developed methods that combine optical trapping and fluorescent imaging to characterize the forces that govern the integrity of amyloid fibrils formed by a yeast prion protein. A critical advance was to employ the self-templating properties of amyloidogenic proteins to tether prion fibrils, enabling their manipulation in the optical trap. At normal pulling forces the fibrils were impervious to disruption. At much higher forces (up to 250 pN), discontinuities occurred in force-extension traces prior to fibril rupture. Selective amyloid disrupting agents and mutations demonstrated that such discontinuities resulted from the unfolding of individual subdomains. Thus, our results reveal unusually strong non-covalent intermolecular contacts that maintain fibril integrity, even when individual monomers partially unfold and extend fibril length.
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