The Clostridium botulinum GerAB germination protein is located in the inner membrane of spores

FEMS Microbiol Lett. 2005 Dec 15;253(2):231-5. doi: 10.1016/j.femsle.2005.09.037. Epub 2005 Oct 10.


Clostridium botulinum dormant spores germinate in presence of l-alanine via a specific receptor composed of GerAA, GerAB and GerAC proteins. In Bacillus subtilis spores, GerAA and GerAC proteins were located in the inner membrane of the spore. We studied the location of the GerAB protein in C. botulinum spore fractions by Western-blot analysis, using an antipeptidic antibody. The protein GerAB was in vitro translated and used to confirm the specificity of the antibodies. GerAB was not present in a coat and spore outer membrane fraction but was present in a fraction of decoated spores containing inner membrane. These results strongly suggest that the protein GerAB is located in the inner membrane of the spore.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Bacterial / analysis
  • Antibody Specificity
  • Bacterial Proteins / analysis*
  • Bacterial Proteins / immunology
  • Cell Membrane / chemistry*
  • Clostridium botulinum / chemistry*
  • Clostridium botulinum / cytology
  • Membrane Proteins / analysis*
  • Membrane Proteins / immunology
  • Spores, Bacterial / chemistry*
  • Spores, Bacterial / cytology


  • Antibodies, Bacterial
  • Bacterial Proteins
  • Membrane Proteins