Molecular analysis of urease genes from a newly identified uncultured species of Helicobacter

Jay V Solnick, J. O'Rourke, A. Lee, L. S. Tompkins

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


'Gastrospirillum hominis' is an uncultured gastric spiral bacterium that has recently been shown by 16S rDNA sequence analysis to be a newly recognized species of Helicobacter that infects humans, and it has been provisionally designated 'Helicobacter heilmannii.' We used PCR to directly amplify the urease structural genes of 'H. heilmannii' from infected gastric tissue. DNA sequence analysis identified two open reading frames, ureA and ureB, which code for polypeptides with predicted molecular weights of 25,729 and 61,831, respectively. The urease subunit genes from 'H. heilmannii' were cloned and expressed in Escherichia coli. Western blot (immunoblot) analysis showed that antiserum directed against the ureA and ureB gene products from H. pylori was cross-reactive with the corresponding polypeptides from 'H. heilmannii.' Analysis of the derived amino acid sequences of 'H. heilmannii' UreA and UreB demonstrated that 'H. heilmannii' urease is more highly related to the urease from H. felis (found in the stomachs of cats and dogs) than to the urease from H. pylori. These data are consistent with 16S rDNA sequence analysis and suggest that 'H. heilmannii' is phylogenetically most closely related to H. felis.

Original languageEnglish (US)
Pages (from-to)1631-1638
Number of pages8
JournalInfection and Immunity
Issue number5
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Immunology


Dive into the research topics of 'Molecular analysis of urease genes from a newly identified uncultured species of Helicobacter'. Together they form a unique fingerprint.

Cite this