National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM099836
米国
American Heart Association
15PRE25090089
米国
National Science Foundation (NSF, United States)
DGE-1321851
米国
Muscular Dystrophy Association
MDA277268
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2016 タイトル: Spiral architecture of the Hsp104 disaggregase reveals the basis for polypeptide translocation. 著者: Adam L Yokom / Stephanie N Gates / Meredith E Jackrel / Korrie L Mack / Min Su / James Shorter / Daniel R Southworth / 要旨: Hsp104, a conserved AAA+ protein disaggregase, promotes survival during cellular stress. Hsp104 remodels amyloids, thereby supporting prion propagation, and disassembles toxic oligomers associated ...Hsp104, a conserved AAA+ protein disaggregase, promotes survival during cellular stress. Hsp104 remodels amyloids, thereby supporting prion propagation, and disassembles toxic oligomers associated with neurodegenerative diseases. However, a definitive structural mechanism for its disaggregase activity has remained elusive. We determined the cryo-EM structure of wild-type Saccharomyces cerevisiae Hsp104 in the ATP state, revealing a near-helical hexamer architecture that coordinates the mechanical power of the 12 AAA+ domains for disaggregation. An unprecedented heteromeric AAA+ interaction defines an asymmetric seam in an apparent catalytic arrangement that aligns the domains in a two-turn spiral. N-terminal domains form a broad channel entrance for substrate engagement and Hsp70 interaction. Middle-domain helices bridge adjacent protomers across the nucleotide pocket, thus explaining roles in ATP hydrolysis and protein disaggregation. Remarkably, substrate-binding pore loops line the channel in a spiral arrangement optimized for substrate transfer across the AAA+ domains, thereby establishing a continuous path for polypeptide translocation.