Identification and mutational analysis of rfbG, the gene encoding CDP-D-glucose-4,6-dehydratase, isolated from free living soil bacterium Azotobacter vinelandii Academic Article uri icon


MeSH Major

  • Azotobacter vinelandii
  • Bacterial Proteins
  • Genes, Bacterial
  • Hydro-Lyases


  • We have identified the rfbG from a non-symbiotic and non-pathogenic soil bacterium, Azotobacter vinelandii. The nucleotide sequence analysis of the rfbG revealed an open reading frame that encodes a peptide of 360 amino acids. This deduced peptide shares 57% homology with the RfbG of Synechocystis and 47% homology with the RfbG of Yersinia pseudotuberculosis. The previously identified short-chain dehydrogenases/reductases family signature sequence is conserved in the sequence of the RfbG of A. vinelandii. Southern blotting analysis of A. vinelandii chromosome by probed with 1.1 kb PstI DNA fragment corresponding to rfbG revealed that it is present as single copy on A. vinelandii chromosome. Disrupting the rfbG present on the chromosome of A. vinelandii, by insertion of kanamycin resistance marker via homologous recombination, resulted in drastic changes in the growth characteristics. The rfbG-negative A. vinelandii grown in liquid medium exhibited agglutination that is characteristic of rfb- mutants of other bacteria, suggesting that we have cloned the functional copy of the rfbG of A. vinelandii.

publication date

  • November 7, 1997



  • Academic Article



  • eng

Digital Object Identifier (DOI)

  • 10.1006/bbrc.1997.7545

PubMed ID

  • 9367902

Additional Document Info

start page

  • 153

end page

  • 61


  • 240


  • 1