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Motor mechanism for protein threading through Hsp104

Wendler, Petra and Shorter, J. and Snead, D. and Plisson, Celia and Clare, Daniel K. and Lindquist, S. and Saibil, Helen R. (2009) Motor mechanism for protein threading through Hsp104. Molecular Cell 34 (1), pp. 81-92. ISSN 1097-2765.

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Official URL: http://dx.doi.org/10.1016/j.molcel.2009.02.026

Abstract

The protein-remodeling machine Hsp104 dissolves amorphous aggregates as well as ordered amyloid assemblies such as yeast prions. Force generation originates from a tandem AAA+ (ATPases associated with various cellular activities) cassette, but the mechanism and allostery of this action remain to be established. Our cryoelectron microscopy maps of Hsp104 hexamers reveal substantial domain movements upon ATP binding and hydrolysis in the first nucleotide-binding domain (NBD1). Fitting atomic models of Hsp104 domains to the EM density maps plus supporting biochemical measurements show how the domain movements displace sites bearing the substrate-binding tyrosine loops. This provides the structural basis for N- to C-terminal substrate threading through the central cavity, enabling a clockwise handover of substrate in the NBD1 ring and coordinated substrate binding between NBD1 and NBD2. Asymmetric reconstructions of Hsp104 in the presence of ATPγS or ATP support sequential rather than concerted ATP hydrolysis in the NBD1 ring.

Item Type: Article
Additional Information: *listed as BBK staff, no details found (PR 8.8.11) #listed as BBK staff, no details found (PR 8.8.11)
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Biological Sciences
Depositing User: Administrator
Date Deposited: 04 Aug 2010 14:09
Last Modified: 17 Apr 2013 12:17
URI: http://eprints.bbk.ac.uk/id/eprint/1079

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