Open AccessCloning and characterization of a Campylobacter jejuni 72Dz/92 gene encoding a 30 kDa immunopositive protein, component of the ABC transport system; expression of the gene in avirulent Salmonella typhimurium
Author(s) -
Pawelec Dariusz,
Rożynek Elżbieta,
Popowski Janusz,
JagusztynKrynicka Elżbieta K.
Publication year - 1997
Publication title -
fems immunology & medical microbiology
Language(s) - English
Resource type - Journals
eISSN - 1574-695X
pISSN - 0928-8244
DOI - 10.1111/j.1574-695x.1997.tb01083.x
Subject(s) - biology , campylobacter jejuni , gene , open reading frame , operon , homology (biology) , campylobacter , microbiology and biotechnology , molecular cloning , nucleic acid sequence , genetics , atp binding cassette transporter , escherichia coli , peptide sequence , bacteria , transporter
Three gene libraries of Campylobacter jejuni 72Dz/92 DNA were prepared using λgt11, pSupercos and pWSK129 cloning vectors. Screening of the libraries with Escherichia coli absorbed antiserum generated against whole C. jejuni revealed several immunoreactive clones of apparent molecular masses 19, 28, 30 and 50 kDa. The most commonly isolated clones expressed 30 kDa protein. The nucleotide sequence of the 1768 bp C. jejuni DNA yielded one complete (ORF2) and two partial open reading frames (ORF1 and ORF3). ORF2 encoded CjaA protein exhibits relevant overall homology to several prokaryotic solute binding proteins (family 3), components of the ABC transport system, while the product of the truncated ORF3 (CjaB protein) shows extensive homology to Gram‐negative bacterial proteins, members of the sugar transporter family. The genetic organization of the putative cjaAB operon was studied. The cjaA gene fragment (616 bp) was amplified from three C. jejuni strains isolated from patients with acute bloody diarrhea, whereas it was not amplified from strains which caused acute diarrhea with no blood in the stools. The gene was introduced into avirulent Salmonella typhimurium vaccine strain where it is expressed at a reasonably high level.