In vivo monitoring of the prion replication cycle reveals a critical role for Sis1 in delivering substrates to Hsp104.

In vivo monitoring of the prion replication cycle reveals a critical role for Sis1 in delivering substrates to Hsp104.
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DOI:
10.1016/j.molcel.2008.11.003
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发表时间:
2008-11-21
期刊:
影响因子:
16
通讯作者:
Weissman, Jonathan S.
Weissman, Jonathan S.
中科院分区:
生物学1区
文献类型:
--
作者:
Tipton, Kimberly A.;Verges, Katherine J.;Weissman, Jonathan S.

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酿酒酵母中的朊病毒是遗传的有序聚集体,依赖于分解酶Hsp104的稳定维持。其他因素在自然朊病毒周期中的作用尚不清楚。我们构建了酵母-细菌嵌合伴侣来解析Hsp104结构域的作用,并扩展了与这些结构域相互作用的伴侣在朊病毒繁殖中的作用。我们的研究结果表明,与非晶态聚集体溶解一样,Hsp70/40体系通过其顶环将朊病毒底物招募到Hsp104中。通过将嵌合体与失活蛋白酶“陷阱”结合,我们监测了朊病毒在体内繁殖的反应产物。我们发现朊病毒的维持伴随着朊病毒蛋白通过Hsp104六聚体的易位,这两个过程都严重依赖于Hsp40 Sis1。我们的数据表明,酵母朊病毒复制是伴侣蛋白活性在溶解无定形聚集体中的自然延伸,与它的祖先反应不同,是由底物的有序、自繁殖结构区分的。
Prions in Saccharomyces cerevisiae are inherited ordered aggregates reliant upon the disaggregase Hsp104 for stable maintenance. The function of other factors in the natural prion cycle is unclear. We constructed yeast-bacterial chimeric chaperones to resolve the roles of Hsp104 domains, and by extension chaperones that interact with these domains, in prion propagation. Our results show that, as with amorphous aggregate dissolution, the Hsp70/40 system recruits prion substrates to Hsp104 via its top ring. By adapting our chimera to couple to an inactive protease “trap”, we monitored the reaction products of prion propagation in vivo. We find that prion maintenance is accompanied by translocation of prion proteins through Hsp104 hexamers and that both processes critically rely upon the Hsp40 Sis1. Our data suggests that yeast prion replication is a natural extension of chaperone activity in dissolving amorphous aggregates, distinguished from its ancestral reaction by the ordered, self-propagating structure of the substrate.
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