title: Cloning, sequence and expression of the gene (aprV5) encoding extracellular serine acidic protease V5 from Dichelobacter nodosus.
abstract: The acidic protease V5-encoding gene (aprV5) from Gram- Dichelobacter nodosus virulent strain 198 was isolated from a cosmid bank by activity screening and sequenced. The 2371-bp nucleotide (nt) sequence contained an open reading frame coding for a protein precursor of 595 amino acid (aa) residues composed of a signal peptide, a pro-region, a mature active protease of 347 aa and a C-terminal extension region of 120 aa. The deduced aa sequence of the pre-pro-mature protease regions showed about 65% similarity to that of D. nodosus basic protease while the C-terminal extension region showed only about 26% similarity. The aprV5 gene, without its C-terminal extension region, was cloned and expressed in Escherichia coli. The acidic protease B5-encoding gene (aprB5) from non-virulent strain 305 was also cloned and sequenced. The aprB5 nt sequence showed 99% homology to that of aprV5 with two single-aa changes occurring in the precursor.
authors.affiliation: Division of Animal Health, CSIRO, Parkville, Victoria, Australia.
authors.forename: M C
authors.initials: MC
authors.lastname: Riffkin
authors.forename: A
authors.initials: A
authors.lastname: Focareta
authors.forename: R D
authors.initials: RD
authors.lastname: Edwards
authors.forename: D J
authors.initials: DJ
authors.lastname: Stewart
authors.forename: A A
authors.initials: AA
authors.lastname: Kortt
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D003360:Cosmids; D004269:DNA, Bacterial; D004926:Escherichia coli; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D017386:Sequence Homology, Amino Acid; D012697:Serine Endopeptidases / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D012697:Serine Endopeptidases; C082170:acidic protease V5, Dichelobacter