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

Research output: Contribution to journalJournal articleResearchpeer-review

  • Jitka Petrlova
  • Arnab Bhattacherjee
  • Boomsma, Wouter
  • Stefan Wallin
  • Jens O. Lagerstedt
  • Anders Irbäck

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.

Original languageEnglish
JournalProtein Science
Issue number11
Pages (from-to)1559-1571
Number of pages13
Publication statusPublished - 2014
Externally publishedYes

ID: 123508160