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:
文献类型:
--
作者:
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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影响因子:
9.8
作者:
Collins SR;Douglass A;Vale RD;Weissman JS
通讯作者:
Weissman JS
DOI:
10.1073/pnas.0806085105
发表时间:
2008-10-14
影响因子:
11.1
作者:
Dudko, Olga K.;Hummer, Gerhard;Szabo, Attila
通讯作者:
Szabo, Attila
DOI:
10.1038/nsb786
发表时间:
2002-05-01
期刊:
NATURE STRUCTURAL BIOLOGY
影响因子:
--
作者:
DePace, AH;Weissman, JS
通讯作者:
Weissman, JS
影响因子:
3.4
作者:
Lang, MJ;Asbury, CL;Block, SM
通讯作者:
Block, SM
影响因子:
3
作者:
Karsai, A.;Martonfalvi, Zs.;Kellermayer, M. S. Z.
通讯作者:
Kellermayer, M. S. Z.