title: Cloning, sequencing and expression of full-length Campylobacter invasion antigen B gene operon from Campylobacter lari.
abstract: A novel PCR primer pair for amplification of full-length cia B gene from thermophilic campylobacters, generated an amplicon of approximately 2.2 kilo base pairs (kbp) with all 18 isolates (n = 7 for urease-negative (UN) C. lari; n = 9 urease-positive thermophilic Campylobacter (UPTC); n = 1 C. jejuni; n = 1 C. coli). The putative open reading frame (ORF) of the cia B from C. lari isolates consisted of 1,833 bp similarly, but differing from those of C. jejuni and C. coli isolates. The putative promoter structures consisting of a semi-conserved T -rich sequence and a consensus sequence at the -10 region were identified upstream of the putative ORF in all the C. lari isolates. A start codon ATG and a probable ribosome binding site were also identified in all the isolates. In addition, two distinctly different and taxon (UN C. lari and UPTC) dependent hypothetically intrinsic rho -independent transcriptional terminators for the cia B were identified to occur within the C. lari. Reverse transcription-PCR analysis identified the transcription of cia B gene in the C. lari cells. The neighbor joining tree suggested that the nucleotide sequence information of the cia B had molecular discrimination efficacy among UN C. lari, UPTC, C. jejuni and C. coli organisms.
authors.affiliation: Azabu University, Fuchinobe, Sagamihara, Japan.
authors.forename: Junnosuke
authors.initials: J
authors.lastname: Onozato
authors.forename: Atsuko
authors.initials: A
authors.lastname: Kumagai
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Sekizuka
authors.forename: Akihiro
authors.initials: A
authors.lastname: Tazumi
authors.forename: John E
authors.initials: JE
authors.lastname: Moore
authors.forename: B Cherie
authors.initials: BC
authors.lastname: Millar
authors.forename: Motoo
authors.initials: M
authors.lastname: Matsuda