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Chaperone proteostasis in Parkinson's disease: stabilization of the Hsp70/alpha-synuclein complex by Hip

Roodveldt, C. and Bertoncini, C.W. and Andersson, A. and van der Goot, A.T. and Hsu, S.T.D. and Fernandez Montesinos, R. and de Jong, J. and van Ham, T.J. and Nollen, E.A. and Pozo, D. and Christodoulou, John and Dobson, C.M. (2008) Chaperone proteostasis in Parkinson's disease: stabilization of the Hsp70/alpha-synuclein complex by Hip. Embo Journal 28 (23), pp. 3758-3770. ISSN 0261-4189.

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Official URL: http://dx.doi.org/10.1038/emboj.2009.298

Abstract

The ATP-dependent protein chaperone heat-shock protein 70 (Hsp70) displays broad anti-aggregation functions and has a critical function in preventing protein misfolding pathologies. According to in vitro and in vivo models of Parkinson's disease (PD), loss of Hsp70 activity is associated with neurodegeneration and the formation of amyloid deposits of α-synuclein (αSyn), which constitute the intraneuronal inclusions in PD patients known as Lewy bodies. Here, we show that Hsp70 depletion can be a direct result of the presence of aggregation-prone polypeptides. We show a nucleotide-dependent interaction between Hsp70 and αSyn, which leads to the aggregation of Hsp70, in the presence of ADP along with αSyn. Such a co-aggregation phenomenon can be prevented in vitro by the co-chaperone Hip (ST13), and the hypothesis that it might do so also in vivo is supported by studies of a Caenorhabditis elegans model of αSyn aggregation. Our findings indicate that a decreased expression of Hip could facilitate depletion of Hsp70 by amyloidogenic polypeptides, impairing chaperone proteostasis and stimulating neurodegeneration.

Item Type: Article
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/1005

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