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Jens Lagerstedt

Associate professor

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Secondary Structure Changes in ApoA-I Milano (R173C) Are Not Accompanied by a Decrease in Protein Stability or Solubility.

Author

  • Jitka Petrlova
  • Jonathan Dalla-Riva
  • Matthias Mörgelin
  • Maria Lindahl
  • Ewa Krupinska
  • Karin Stenkula
  • John Voss
  • Jens Lagerstedt

Summary, in English

Apolipoprotein A-I (apoA-I) is the main protein of high-density lipoprotein (HDL) and a principal mediator of the reverse cholesterol transfer pathway. Variants of apoA-I have been shown to be associated with hereditary amyloidosis. We previously characterized the G26R and L178H variants that both possess decreased stability and increased fibril formation propensity. Here we investigate the Milano variant of apoAI (R173C; apoAI-M), which despite association with low plasma levels of HDL leads to low prevalence of cardiovascular disease in carriers of this mutation. The R173C substitution is located to a region (residues 170 to 178) that contains several fibrillogenic apoA-I variants, including the L178H variant, and therefore we investigated a potential fibrillogenic property of the apoAI-M protein. Despite the fact that apoAI-M shared several features with the L178H variant regarding increased helical content and low degree of ThT binding during prolonged incubation in physiological buffer, our electron microscopy analysis revealed no formation of fibrils. These results suggest that mutations inducing secondary structural changes may be beneficial in cases where fibril formation does not occur.

Department/s

  • Medical Protein Science
  • Infection Medicine (BMC)
  • EXODIAB: Excellence in Diabetes Research in Sweden

Publishing year

2014

Language

English

Publication/Series

PLoS ONE

Volume

9

Issue

4

Document type

Journal article

Publisher

Public Library of Science

Topic

  • Infectious Medicine
  • Cell and Molecular Biology

Status

Published

Research group

  • Medical Protein Science

ISBN/ISSN/Other

  • ISSN: 1932-6203