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The secondary structure of apolipoprotein A-I on 9.6-nm reconstituted high-density lipoprotein determined by EPR spectroscopy

In English

Författare

Summary, in English

ApolipoproteinA-I (ApoA-I) is the major protein component of high-density lipoprotein (HDL), and is critical for maintenance of cholesterol homeostasis. During reverse cholesterol transport, HDL transitions between an array of subclasses, differing in size and composition. This process requires ApoA-I to adapt to changes in the shape of the HDL particle, transiting from an apolipoprotein to a myriad of HDL subclass-specific conformations. Changes in ApoA-I structure cause alterations in HDL-specific enzyme and receptor-binding properties, and thereby direct the HDL particle through the reverse cholesterol transport pathway. In this study, we used site-directed spin label spectroscopy to examine the conformational details of the ApoA-I central domain on HDL. The motional dynamics and accessibility to hydrophobic/hydrophilic relaxation agents of ApoA-I residues99-163 on 9.6-nm reconstituted HDL was analyzed by EPR. In previous analyses, we examined residues6-98 and 164-238 (of ApoA-I's 243 residues), and combining these findings with the current results, we have generated a full-length map of the backbone structure of reconstituted HDL-associated ApoA-I. Remarkably, given that the majority of ApoA-I's length is composed of amphipathic helices, we have identified nonhelical residues, specifically the presence of a -strand (residues149-157). The significance of these nonhelical residues is discussed, along with the other features, in the context of ApoA-I function in contrast to recent models derived by other methods.

Avdelning/ar

Publiceringsår

2013

Språk

Engelska

Sidor

3416-3424

Publikation/Tidskrift/Serie

The FEBS Journal

Volym

280

Issue

14

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Biochemistry and Molecular Biology

Nyckelord

  • apolipoproteinA-I (ApoA-I)
  • cardiovascular
  • cholesterol
  • EPR
  • spectroscopy
  • high-density lipoprotein (HDL)

Status

Published

Forskningsgrupp

  • Medical Protein Science

ISBN/ISSN/Övrigt

  • ISSN: 1742-464X