A model structure for the heterodimer apoA-IMilano-apoA-II supports its peculiar susceptibility to proteolysis

Biophys J. 2006 Oct 15;91(8):3043-9. doi: 10.1529/biophysj.106.085886. Epub 2006 Aug 4.

Abstract

In this study, we propose a structure for the heterodimer between apolipoprotein A-I(Milano) and apolipoprotein A-II (apoA-I(M)-apoA-II) in a synthetic high-density lipoprotein (HDL) containing L-alpha-palmitoyloleoyl phosphatidylcholine. We applied bioinformatics/computational tools and procedures, such as molecular docking, molecular and essential dynamics, starting from published crystal structures for apolipoprotein A-I and apolipoprotein A-II. Structural and energetic analyses onto the simulated system showed that the molecular dynamics produced a stabilized synthetic HDL. The essential dynamic analysis showed a deviation from the starting belt structure. Our structural results were validated by limited proteolysis experiments on HDL from apoA-I(M) carriers in comparison with control HDL. The high sensitivity of apoA-I(M)-apoA-II to proteases was in agreement with the high root mean-square fluctuation values and the reduction in secondary structure content from molecular dynamics data. Circular dichroism on synthetic HDL containing apoA-I(M)-apoA-II was consistent with the alpha-helix content computed on the proposed model.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Apolipoprotein A-I / chemistry*
  • Apolipoprotein A-I / genetics
  • Apolipoprotein A-II / chemistry*
  • Apolipoprotein A-II / genetics
  • Computer Simulation*
  • Dimerization
  • Humans
  • Hydrolysis
  • Lipoproteins, HDL / chemistry
  • Models, Molecular*
  • Mutation
  • Phosphatidylcholines / chemistry
  • Protein Structure, Secondary

Substances

  • Apolipoprotein A-I
  • Apolipoprotein A-II
  • Lipoproteins, HDL
  • Phosphatidylcholines
  • apolipoprotein A-I Milano
  • 1-palmitoyl-2-oleoylphosphatidylcholine