Structure of outer membrane protein A transmembrane domain by NMR spectroscopy

Nat Struct Biol. 2001 Apr;8(4):334-8. doi: 10.1038/86214.


We have determined the three-dimensional fold of the 19 kDa (177 residues) transmembrane domain of the outer membrane protein A of Escherichia coli in dodecylphosphocholine (DPC) micelles in solution using heteronuclear NMR. The structure consists of an eight-stranded beta-barrel connected by tight turns on the periplasmic side and larger mobile loops on the extracellular side. The solution structure of the barrel in DPC micelles is similar to that in n-octyltetraoxyethylene (C(8)E(4)) micelles determined by X-ray diffraction. Moreover, data from NMR dynamic experiments reveal a gradient of conformational flexibility in the structure that may contribute to the membrane channel function of this protein.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Bacterial Outer Membrane Proteins / chemistry*
  • Bacterial Outer Membrane Proteins / genetics
  • Bacterial Outer Membrane Proteins / metabolism*
  • Cell Membrane / metabolism*
  • Detergents / metabolism
  • Escherichia coli / chemistry*
  • Escherichia coli / genetics
  • Micelles
  • Models, Molecular
  • Nuclear Magnetic Resonance, Biomolecular*
  • Protein Folding
  • Protein Renaturation
  • Protein Structure, Tertiary
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / genetics
  • Recombinant Proteins / metabolism


  • Bacterial Outer Membrane Proteins
  • Detergents
  • Micelles
  • Recombinant Proteins
  • OMPA outer membrane proteins

Associated data

  • PDB/1G90