Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Chem Biol. 2012 May 25;19(5):599-607. doi: 10.1016/j.chembiol.2012.04.007.

Dissecting heterogeneous molecular chaperone complexes using a mass spectrum deconvolution approach.

Author information

  • 1Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QZ, UK.

Abstract

Small heat-shock proteins (sHSPs) are molecular chaperones that prevent irreversible aggregation through binding nonnative target proteins. Due to their heterogeneity, these sHSP:target complexes remain poorly understood. We present a nanoelectrospray mass spectrometry analysis algorithm for estimating the distribution of stoichiometries comprising a polydisperse ensemble of oligomers. We thus elucidate the organization of complexes formed between sHSPs and different target proteins. We find that binding is mass dependent, with the resultant complexes reflecting the native quaternary architecture of the target, indicating that protection happens early in the denaturation. Our data therefore explain the apparent paradox of how variable complex morphologies result from the generic mechanism of protection afforded by sHSPs. Our approach is applicable to a range of polydisperse proteins and provides a means for the automated and accurate interpretation of mass spectra derived from heterogeneous protein assemblies.

Copyright © 2012 Elsevier Ltd. All rights reserved.

Comment in

PMID:
22633411
[PubMed - indexed for MEDLINE]
PMCID:
PMC3458707
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for PubMed Central
    Loading ...
    Write to the Help Desk