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.
中科院分区:
文献类型:
--
作者:
Tipton, Kimberly A.;Verges, Katherine J.;Weissman, Jonathan S.
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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DOI:
10.1083/jcb.114.4.623
发表时间:
1991-08
期刊:
The Journal of cell biology
影响因子:
--
作者:
Luke MM;Sutton A;Arndt KT
通讯作者:
Arndt KT
影响因子:
16
作者:
Flynn, JM;Neher, SB;Baker, TA
通讯作者:
Baker, TA
影响因子:
3
作者:
Boesl, Benjamin;Grimminger, Valerie;Walter, Stefan
通讯作者:
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影响因子:
3.3
作者:
Allen, KD;Wegrzyn, RD;Chernoff, YO
通讯作者:
Chernoff, YO
影响因子:
3.5
作者:
Krzewska, J;Langer, T;Liberek, K
通讯作者:
Liberek, K