Fhua and HgbA, outer membrane proteins of Actinobacillus pleuropneumoniae: their role as virulence determinants.

Abstract:

:For the recently described serotype 15 of biotype I and serotypes 13 and 14 of biotype II of Actinobacillus pleuropneumoniae, fhuA and hgbA were detected by polymerase chain reaction and DNA sequencing. To determine the substrate specificity of the iron receptors FhuA and HgbA and to study their role in the virulence of A. pleuropneumoniae, we used two isogenic A. pleuropneumoniae serotype 1 deletion mutants of fhuA and hgbA. Different sources of iron and siderophores were tested in growth promotion assays. FhuA and HgbA are specific for their ligands ferrichrome and hemoglobin, respectively. The virulence of the two deletion mutant strains was evaluated in experimental infections using specific pathogen-free piglets. While the fhuA mutant (DG02) was as highly virulent as the parental strain S4074, the virulence of the hgbA mutant (DeltahgbA) was reduced. Our data indicate that both FhuA and HgbA are conserved among all serotypes and biotypes of A. pleuropneumoniae and that HgbA, the receptor for porcine hemoglobin, may play a role in virulence.

journal_name

Can J Microbiol

authors

Shakarji L,Mikael LG,Srikumar R,Kobisch M,Coulton JW,Jacques M

doi

10.1139/w05-135

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

391-6

issue

4

eissn

0008-4166

issn

1480-3275

pii

w05-135

journal_volume

52

pub_type

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