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- Title
Hsp70 and Hsp40 attenuate formation of spherical and annular polyglutamine oligomers by partitioning monomer.
- Authors
Wacker, Jennifer L.; Zareie, M. Hadi; Hanson Fong; Sarikaya, Mehmet; Muchowski, Paul J.
- Abstract
Protein conformational changes that result in misfolding, aggregation and amyloid fibril formation are a common feature of many neurodegenerative disorders. Studies withß-amyloid (Aß),a-synuclein and other amyloid-forming proteins indicate that the assembly of misfolded protein conformers into fibrils is a complex process that may involve the population of metastable spherical and/or annular oligomeric assemblies. Here, we show by atomic force microscopy that a mutant huntingtin fragment with an expanded polyglutamine repeat forms spherical and annular oligomeric structures reminiscent of those formed by Aßanda-synuclein. Notably, the molecular chaperones Hsp70 and Hsp40, which are protective in animal models of neurodegeneration, modulate polyglutamine aggregation reactions by partitioning monomeric conformations and disfavoring the accretion of spherical and annular oligomers.
- Subjects
OLIGOMERS; PROTEINS; NEURODEGENERATION; MONOMERS; MOLECULAR biology; PROTEOMICS
- Publication
Nature Structural & Molecular Biology, 2004, Vol 11, Issue 12, p1215
- ISSN
1545-9993
- Publication type
Article
- DOI
10.1038/nsmb860