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Related Experiment Videos

A transmembrane helix dimer: structure and implications

K R MacKenzie1, J H Prestegard, D M Engelman

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520-8114, USA.

Science (New York, N.Y.)
|April 4, 1997
PubMed
Summary
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The transmembrane domain of glycophorin A (GpA) forms a dimer through specific van der Waals interactions. This study reveals the 3D structure of the GpA dimer, explaining its stable association.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Membrane Proteins

Background:

  • Glycophorin A (GpA) is a major sialoglycoprotein of the human erythrocyte membrane.
  • The dimerization of GpA's transmembrane domain is crucial for its function and stability.
  • Previous studies indicated sequence-dependent dimerization of GpA.

Purpose of the Study:

  • To determine the three-dimensional structure of the dimeric transmembrane domain of glycophorin A (GpA).
  • To elucidate the molecular interactions mediating GpA dimerization.
  • To explain the sequence-specific association of GpA transmembrane helices.

Main Methods:

  • Solution nuclear magnetic resonance (NMR) spectroscopy.
  • Utilized a 40-residue GpA peptide solubilized in aqueous detergent micelles.

Related Experiment Videos

  • 3D structure determination of the dimeric transmembrane domain.

    • Main Results:

    • The dimeric transmembrane domain of GpA features two membrane-spanning alpha helices.
    • These helices cross at an angle of -40 degrees, forming a well-packed interface.
    • No intermonomer hydrogen bonds were observed; dimerization is mediated by van der Waals interactions.

    Conclusions:

    • The determined 3D structure explains the sequence-dependent dimerization of GpA.
    • Van der Waals interactions alone are sufficient for stable and specific transmembrane helix associations.
    • Provides a structural basis for understanding protein-protein interactions within cell membranes.