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Conformational and aggregation properties of the 1-93 fragment of apolipoprotein A-I.

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Author

Summary, in English

Several disease-linked mutations of apolipoprotein A-I, the major protein in high-density lipoprotein (HDL), are known to be amyloidogenic, and the fibrils often contain N-terminal fragments of the protein. Here, we present a combined computational and experimental study of the fibril-associated disordered 1-93 fragment of this protein, in wild-type and mutated (G26R, S36A, K40L, W50R) forms. In atomic-level Monte Carlo simulations of the free monomer, validated by circular dichroism spectroscopy, we observe changes in the position-dependent β-strand probability induced by mutations. We find that these conformational shifts match well with the effects of these mutations in thioflavin T fluorescence and transmission electron microscopy experiments. Together, our results point to molecular mechanisms that may have a key role in disease-linked aggregation of apolipoprotein A-I.

Department/s

Publishing year

2014

Language

English

Pages

1559-1571

Publication/Series

Protein Science

Volume

23

Issue

11

Document type

Journal article

Publisher

The Protein Society

Topic

  • Cell and Molecular Biology

Status

Published

Research group

  • Medical Protein Science

ISBN/ISSN/Other

  • ISSN: 1469-896X