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The Journal of Membrane Biology

, Volume 247, Issue 9–10, pp 949–956 | Cite as

Outer Membrane Protein F Stabilised with Minimal Amphipol Forms Linear Arrays and LPS-Dependent 2D Crystals

  • Wanatchaporn Arunmanee
  • J. Robin Harris
  • Jeremy H. LakeyEmail author
Article

Abstract

Amphipols (APol) are polymers which can solubilise and stabilise membrane proteins (MP) in aqueous solutions. In contrast to conventional detergents, APol are able to keep MP soluble even when the free APol concentration is very low. Outer membrane protein F (OmpF) is the most abundant MP commonly found in the outer membrane (OM) of Escherichia coli. It plays a vital role in the transport of hydrophilic nutrients, as well as antibiotics, across the OM. In the present study, APol was used to solubilise OmpF to characterize its interactions with molecules such as lipopolysaccharides (LPS) or colicins. OmpF was reconstituted into APol by the removal of detergents using Bio-Beads followed by size-exclusion chromatography (SEC) to remove excess APol. OmpF/APol complexes were then analysed by SEC, dynamic light scattering (DLS) and transmission electron microscopy (TEM). TEM showed that in the absence of free APol–OmpF associated as long filaments with a thickness of ~6 nm. This indicates that the OmpF trimers lie on their sides on the carbon EM grid and that they also favour side by side association. The formation of filaments requires APol and occurs very rapidly. Addition of LPS to OmpF/APol complexes impeded filament formation and the trimers form 2D sheets which mimic the OM. Consequently, free APol is undoubtedly required to maintain the homogeneity of OmpF in solutions, but ‘minimum APol’ provides a new phase, which can allow weaker protein–protein and protein–lipid interactions characteristic of native membranes to take place and thus control 1D–2D crystallisation.

Keywords

OmpF Lipopolysaccharides Amphipol Transmission electron microscopy Dynamic light scattering SEC 

Notes

Acknowledgments

This work was supported by a Royal Thai Government Scholarship to WA and the Wellcome Trust (Grant number 093581). We thank the Newcastle University Biomedical Electron Microscopy Unit and Dr. Helen Ridley for her technical assistance. We thank Jean-Luc Popot and Christophe Tribet for advice and amphipol samples.

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Authors and Affiliations

  • Wanatchaporn Arunmanee
    • 1
  • J. Robin Harris
    • 1
    • 2
  • Jeremy H. Lakey
    • 1
    Email author
  1. 1.Institute for Cell and Molecular BiosciencesNewcastle UniversityNewcastle upon TyneUK
  2. 2.Institute of ZoologyUniversity of MainzMainzGermany

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