The Aeromonas dsbA mutation decreased their virulence by triggering type III secretion system but not flagella production.

Abstract:

:Pathogenesis of Aeromonas species have been reported to be associated with virulence factors such as lipopolysaccharides (LPS), bacterial toxins, bacterial secretion systems, flagella, and other surface molecules. Dsb (Disulfide bond) proteins play an important role in catalyzing disulfide bond formation in proteins within the periplasmic space. An A. hydrophila dsbA mutant with attenuated virulence using Dictyostelium amoebae as an alternative host model was identified. The attenuated virulence was tested in other animal models (by intraperitoneal injection in fish and mice) and was correlated with the presence of a defective type III secretion system for the first time in non enteric bacteria. The dsbA mutation was shown in several enteric bacteria to involve the outer membrane secretin. The defect in Aeromonas also seems to involve the outer membrane secretin homologue named AscC. However, unlike what happen in Escherichia coli, no changes in motility or flagella expression were observed for A. hydrophila dsbA mutants. The loss of E. coli motility caused by deletion of dsbA is likely due to defective disulfide bond formation in FlgI, a component of the flagella. No disulfide bond formation in FlgI homologues in Aeromonas flagella biogenesis, either polar or lateral, could be expected according to their amino acid residues sequences.

journal_name

Microb Pathog

journal_title

Microbial pathogenesis

authors

Vilches S,Jiménez N,Merino S,Tomás JM

doi

10.1016/j.micpath.2011.10.006

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

130-9

issue

2

eissn

0882-4010

issn

1096-1208

pii

S0882-4010(11)00188-4

journal_volume

52

pub_type

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