期刊
PROTEIN SCIENCE
卷 16, 期 4, 页码 626-634出版社
WILEY-BLACKWELL
DOI: 10.1110/ps.062599907
关键词
prefoldin; molecular chaperones; protein filaments; heat-shock response
资金
- NCRR NIH HHS [RR-01081, P41 RR001081] Funding Source: Medline
Prefoldin is a molecular chaperone found in the domains eukarya and archaea that acts in conjunction with Group II chaperonin to correctly fold other nascent proteins. Previously, our group identified a putative single subunit of prefoldin, gamma PFD, that was up-regulated in response to heat stress in the hyperthermophilic archaeon Methanocaldococcus jannaschii. In order to characterize this protein, we subcloned and expressed it and the other two prefoldin subunits from M. jannaschii, alpha and beta PFD, into Eschericia coli and characterized the proteins. Whereas alpha and beta PFD readily assembled into the expected hexamer, gamma PFD would not assemble with either protein. Instead, gamma PFD forms long filaments of defined dimensions measuring 8.5 nm x 1.7 - 3.5 nm and lengths exceeding 1 mu m. Filamentous gamma PFD acts as a molecular chaperone through in vitro assays, in a manner comparable to PFD. A possible molecular model for filament assembly is discussed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据