Crystal structure of the Campylobacter jejuni CmeC outer membrane channel

Protein Sci. 2014 Jul;23(7):954-61. doi: 10.1002/pro.2478. Epub 2014 May 6.


As one of the world's most prevalent enteric pathogens, Campylobacter jejuni is a major causative agent of human enterocolitis and is responsible for more than 400 million cases of diarrhea each year. The impact of this pathogen on children is of particular significance. Campylobacter has developed resistance to many antimicrobial agents via multidrug efflux machinery. The CmeABC tripartite multidrug efflux pump, belonging to the resistance-nodulation-cell division (RND) superfamily, plays a major role in drug resistant phenotypes of C. jejuni. This efflux complex spans the entire cell envelop of C. jejuni and mediates resistance to various antibiotics and toxic compounds. We here report the crystal structure of C. jejuni CmeC, the outer membrane component of the CmeABC tripartite multidrug efflux system. The structure reveals a possible mechanism for substrate export.

Keywords: Campylobacter jejuni; efflux channel; membrane protein; multidrug resistance; resistance-nodulation-cell division.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Bacterial Proteins / chemistry*
  • Bacterial Proteins / genetics
  • Campylobacter jejuni / genetics
  • Campylobacter jejuni / metabolism*
  • Crystallography, X-Ray*
  • Cysteine / metabolism
  • Ion Channels / chemistry*
  • Models, Molecular
  • Protein Conformation
  • Protein Structure, Secondary


  • Bacterial Proteins
  • Ion Channels
  • Cysteine

Associated data

  • PDB/4MT4