A homoserine lactone autoinducer regulates virulence of an insect-pathogenic bacterium, Xenorhabdus nematophilus (Enterobacteriaceae).

AUTOR(ES)

Dunphy, G

RESUMO

N-beta-Hydroxybutanoyl homoserine lactone (HBHL), the autoinducer of the luminescent system of Vibrio harveyi, has been identified as the first small compound to restore virulence to avirulent mutants of Xenorhabdus nematophilus. HBHL stimulated the level of lipase activity excreted by avirulent X. nematophilus and lowered the phenoloxidase activity in the hemolymph of insects infected with X. nematophilus, parameters that are both associated with insect pathogenesis. Moreover, mortality of the insects infected with avirulent X. nematophilus was restored upon injection with HBHL. Chloroform extraction of medium conditioned with wild-type but not avirulent X. nematophilus led to the isolation of a compound with the same chromatographic mobility as HBHL as well as the ability to stimulate the luminescence of a dim autoinducer-dependent mutant of V. harveyi. Transfer of the V. harveyi lux operon into avirulent and wild-type X. nematophilus generated dim and bright luminescent strains, respectively, which responded to HBHL and an agonist and antagonist in a manner analogous to their effects on the luminescence of dim autoinducer-deficient and bright wild-type strains of V. harveyi, indicating that similar HBHL-dependent regulatory systems exist in these two bacterial species.

Documentos Relacionados

• Habitat Association in Two Genetic Groups of the Insect-Pathogenic Fungus Metarhizium anisopliae: Uncovering Cryptic Species?
• Protein inclusions produced by the entomopathogenic bacterium Xenorhabdus nematophilus subsp. nematophilus.
• Role of the histidine kinase, EnvZ, in the production of outer membrane proteins in the symbiotic-pathogenic bacterium Xenorhabdus nematophilus.
• Transformation of Xenorhabdus nematophilus.
• The Pseudomonas aeruginosa Autoinducer N-3-Oxododecanoyl Homoserine Lactone Accelerates Apoptosis in Macrophages and Neutrophils