Nucleotide sequence encoding the mannose-fucose-resistant hemagglutinin of Vibrio cholerae O1 and construction of a mutant.

Abstract

The region of DNA encoding the mannose-fucose-resistant hemagglutinin (MFRHA) of Vibrio cholerae O1 has been localized, and the nucleotide sequence has been determined. The region contains a single open reading frame encoding 230 amino acids, corresponding to a protein of 26.9 kDa. The N terminus of this protein is atypical for a protein localized in the outer membrane. A mutant lacking MFRHA activity has been constructed by allelic exchange after inactivation via the insertion of a kanamycin resistance gene cartridge. The MFRHA-negative mutant has been assessed for virulence in the infant mouse cholera model. This mutant shows a marked defect in its ability to persist in the infant mouse gut and is incapable of competing with the wild-type organism, even when given in 25-fold excess. This defect also leads to a > 100-fold increase in the 50% lethal dose. These data suggest that the MFRHA is an important colonization factor in the infant mouse model.

• Authors: V L Franzon, A Barker, P A Manning
• Journal: Infection and immunity (Infect Immun) Vol. 61 Issue 7 Pg. 3032-7 (Jul 1993) ISSN: 0019-9567 [Print] United States
• PMID: 8514410 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Hemagglutinins
• Lectins
• mannose-fucose-resistant hemagglutinin
• Fucose
• Mannose

Topics

• Amino Acid Sequence
• Animals
• Base Sequence
• Fucose (pharmacology)
• Hemagglutinins (chemistry, genetics, toxicity)
• Lectins
• Mannose (pharmacology)
• Mice
• Molecular Sequence Data
• Mutation
• Vibrio cholerae (genetics, pathogenicity)
• Virulence