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- Title
Crystal structure and assembly of a eukaryotic small heat shock protein.
- Authors
van Montfort, Rob L. M.; Basha, Eman; Friedrich, Kenneth L.; Slingsby, Christine; Vierling, Elizabeth
- Abstract
The 2.7 Å structure of wheat HSP16.9, a member of the small heat shock proteins (sHSPs), indicates how its α-crystallin domain and flanking extensions assemble into a dodecameric double disk. The folding of the monomer and assembly of the oligomer are mutually interdependent, involving strand exchange, helix swapping, loose knots and hinged extensions. In support of the chaperone mechanism, the substrate-bound dimers, in temperature-dependent equilibrium with higher assembly forms, have unfolded N-terminal arms and exposed conserved hydrophobic binding sites on the α-crystallin domain. The structure also provides a model by which members of the sHSP protein family bind unfolded substrates, which are involved in a variety of neurodegenerative diseases and cataract formation.
- Subjects
HEAT shock proteins; CRYSTALLOGRAPHY; EUKARYOTIC cells; PROTEIN folding
- Publication
Nature Structural Biology, 2001, Vol 8, Issue 12, p1025
- ISSN
1072-8368
- Publication type
Article
- DOI
10.1038/nsb722