Pulling single bacteriorhodopsin out of a membrane: Comparison of simulation and experiment

Marek Cieplak, Sławomir Filipek, Harald Janovjak, Krystiana A. Krzyśko

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15 Citations (Scopus)

Abstract

Mechanical unfolding of single bacteriorhodopsins from a membrane bilayer is studied using molecular dynamics simulations. The initial conformation of the lipid membrane is determined through all-atom simulations and then its coarse-grained representation is used in the studies of stretching. A Go-like model with a realistic contact map and with Lennard-Jones contact interactions is applied to model the protein-membrane system. The model qualitatively reproduces the experimentally observed differences between force-extension patterns obtained on bacteriorhodopsin at different temperatures and predicts a lack of symmetry in the choice of the terminus to pull by. It also illustrates the decisive role of the interactions of the protein with the membrane in determining the force pattern and thus the stability of transmembrane proteins.

Original languageEnglish
Pages (from-to)537-544
Number of pages8
JournalBiochimica et Biophysica Acta - Biomembranes
Volume1758
Issue number4
DOIs
Publication statusPublished - Apr 2006
Externally publishedYes

Keywords

  • AFM
  • Bacteriorhodopsin
  • Go model
  • Mechanical stretching of protein
  • Membrane
  • Molecular dynamic

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