NMR analyses of the interaction between the FYVE domain of early endosome antigen 1 (EEA1) and phosphoinositide embedded in a lipid bilayer

J Biol Chem. 2012 Oct 12;287(42):34936-34945. doi: 10.1074/jbc.M112.398255. Epub 2012 Aug 22.

Abstract

Phosphoinositides (PIs) are crucial lipid components of membranes and are involved in a number of cellular processes through interactions with their effector proteins. Recently, we have established a lipid-protein nanoscale bilayer (nanodisc) containing PIs, hereafter referred to as PI-nanodisc and demonstrated that it could be used for both qualitative and quantitative evaluations of protein-membrane interactions. Here, we report further NMR analyses for obtaining structural insights at the residue-specific level between PI-binding effector protein and PI-nanodisc, using the FYVE domain of early endosome antigen 1 (EEA1), denoted as EEA1 FYVE, and PI(3)P-nanodisc as a model system. We performed a combination of the NMR analyses including chemical shift perturbation, transferred cross-saturation, and paramagnetic relaxation enhancement experiments. These enabled an identification of the interaction surface, structural change, and relative orientation of EEA1 FYVE to the PI(3)P-incorporated lipid bilayer, substantiating that NMR analyses of protein-membrane interactions using nanodisc makes it possible to show the residue-specific interactions in the lipid bilayer environment.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Humans
  • Lipid Bilayers / chemistry*
  • Nanostructures / chemistry*
  • Nuclear Magnetic Resonance, Biomolecular
  • Phosphatidylinositols / chemistry*
  • Phosphatidylinositols / metabolism
  • Protein Structure, Tertiary
  • Vesicular Transport Proteins / chemistry*
  • Vesicular Transport Proteins / genetics
  • Vesicular Transport Proteins / metabolism

Substances

  • Lipid Bilayers
  • Phosphatidylinositols
  • Vesicular Transport Proteins
  • early endosome antigen 1