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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Assembly of the m2 tetramer is strongly modulated by lipid chain length

Sandra Schick1, Lirong Chen, Edwin Li

  • 1Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland, USA.

Biophysical Journal
|September 23, 2010
PubMed

Insights

The influenza virus matrix protein 2 (M2) forms tetramers. Shorter lipid chains enhance M2 helix association, suggesting lipid length influences membrane protein assembly.

Area of Science:

  • Biophysics
  • Structural Biology
  • Virology

Background:

  • The influenza virus matrix protein 2 (M2) is crucial for viral uncoating and maturation.
  • M2's transmembrane domain assembles into a tetramer and serves as a model for membrane protein interactions.
  • Understanding protein-lipid and protein-protein interactions is key to membrane protein structure and function.

Purpose of the Study:

  • To investigate how lipid chain length affects the association of the M2 transmembrane domain into tetramers.
  • To determine the role of bilayer thickness in modulating M2 helix interactions.

Main Methods:

  • Utilized Förster resonance energy transfer (FRET) to monitor M2 helix association.
  • Compared M2 behavior in two distinct phospholipid bilayers: 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC).

Main Results:

  • M2 helix interactions were significantly stronger in DLPC bilayers compared to POPC bilayers.
  • The observed differences correlate with the differing lipid chain lengths and resulting bilayer thicknesses.

Conclusions:

  • Lipid chain length and bilayer thickness are critical factors influencing transmembrane helix association.
  • These lipid properties can significantly modulate the formation of functional membrane protein oligomers, including viral proteins like M2.

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