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Population of nonnative states of lysozyme variants drives amyloid fibril formation.

Buell, AK and Dhulesia, A and Mossuto, MF and Cremades, N and Kumita, JR and Dumoulin, M and Welland, ME and Knowles, TP and Salvatella, X and Dobson, CM (2011) Population of nonnative states of lysozyme variants drives amyloid fibril formation. J Am Chem Soc, 133. pp. 7737-7743.

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Abstract

The propensity of protein molecules to self-assemble into highly ordered, fibrillar aggregates lies at the heart of understanding many disorders ranging from Alzheimer's disease to systemic lysozyme amyloidosis. In this paper we use highly accurate kinetic measurements of amyloid fibril growth in combination with spectroscopic tools to quantify the effect of modifications in solution conditions and in the amino acid sequence of human lysozyme on its propensity to form amyloid fibrils under acidic conditions. We elucidate and quantify the correlation between the rate of amyloid growth and the population of nonnative states, and we show that changes in amyloidogenicity are almost entirely due to alterations in the stability of the native state, while other regions of the global free-energy surface remain largely unmodified. These results provide insight into the complex dynamics of a macromolecule on a multidimensional energy landscape and point the way for a better understanding of amyloid diseases.

Item Type: Article
Uncontrolled Keywords: Amyloid Humans Muramidase
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:22
Last Modified: 23 Jun 2014 01:02
DOI: 10.1021/ja109620d

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