title: Cloning and nucleotide sequence of the Vibrio cholerae hemagglutinin/protease (HA/protease) gene and construction of an HA/protease-negative strain.
abstract: The structural gene hap for the extracellular hemagglutinin/protease (HA/protease) of Vibrio cholerae was cloned and sequenced. The cloned DNA fragment contained a 1,827-bp open reading frame potentially encoding a 609-amino-acid polypeptide. The deduced protein contains a putative signal sequence followed by a large propeptide. The extracellular HA/protease consists of 414 amino acids with a computed molecular weight of 46,700. In the absence of protease inhibitors, this is processed to the 32-kDa form which is usually isolated. The deduced amino acid sequence of the mature HA/protease showed 61.5% identity with the Pseudomonas aeruginosa elastase. The cloned hap gene was inactivated and introduced into the chromosome of V. cholerae by recombination to construct the HA/protease-negative strain HAP-1. The cloned fragment containing the hap gene was then shown to complement the mutant strain.
authors.affiliation: Department of Molecular Microbiology and Immunology, School of Medicine, University of Missouri, Columbia 65212.
authors.forename: C C
authors.initials: CC
authors.lastname: Häse
authors.forename: R A
authors.initials: RA
authors.lastname: Finkelstein
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D015153:Blotting, Western; D003001:Cloning, Molecular; D005798:Genes, Bacterial; D006388:Hemagglutinins / Q000235:genetics*; D008969:Molecular Sequence Data; D010957:Plasmids; D015183:Restriction Mapping; D014170:Transformation, Genetic; D014734:Vibrio cholerae / Q000235:genetics*
chemical_list: D006388:Hemagglutinins