Open AccessIdentification and characterization of the TonB region and its role in transferrin‐mediated iron acquisition in Haemophilus parasuis
Author(s) -
Río María Luisa,
GutiérrezMartín César B.,
RodríguezBarbosa José I.,
Navas Jesús,
RodríguezFerri Elías F.
Publication year - 2005
Publication title -
fems immunology & medical microbiology
Language(s) - English
Resource type - Journals
eISSN - 1574-695X
pISSN - 0928-8244
DOI - 10.1016/j.femsim.2005.02.008
Subject(s) - polyclonal antibodies , actinobacillus pleuropneumoniae , biology , pasteurella multocida , haemophilus , transferrin , pasteurellaceae , fusion protein , amino acid , microbiology and biotechnology , peptide sequence , antibody , serotype , biochemistry , recombinant dna , bacteria , gene , genetics , haemophilus influenzae , antibiotics
Haemophilus parasuis is the causative agent of Glässer's disease, which is responsible for considerable economic losses in the pig‐rearing industry. The aim of the study reported here was the identification, sequencing and molecular characterization of the TonB region that includes tonB , exbBD , and tbpBA genes in H. parasuis. In addition, two fusion proteins were generated. One of them (pGEX‐6P‐1‐GST‐TbpB) contained the first 501 amino acids of H. parasuis TbpB protein, while the second (pBAD‐Thio‐TbpB‐V5‐His) included the first 102 amino acids of H. parasuis TbpB N‐terminus domain. A panel of 14 hybridomas secreting monoclonal antibodies was raised against the two recombinant TbpB fusion proteins. Furthermore, to assess whether the expression of the H. parasuis ExbB, TbpB, and TbpA proteins was upregulated under conditions of restricted availability of iron, a rabbit polyclonal antibody against H. parasuis TbpB‐His fusion protein was produced. A rabbit polyclonal antibody against serotype 7 of Actinobacillus pleuropneumoniae ExbB and TbpA proteins was also used for the detection of the homologous proteins in H. parasuis . Overall, the data indicate that H. parasuis , like other members of the Pasteurellaceae family, possesses the genetic elements of the TonB region for iron acquisition and the transferrin‐binding proteins encoded under this region are upregulated under restricted iron availability.