Role of the Photorhabdus Dam methyltransferase during interactions with its invertebrate hosts
Autoři:
Amaury Payelleville aff001; Dana Blackburn aff002; Anne Lanois aff001; Sylvie Pagès aff001; Marine C. Cambon aff001; Nadege Ginibre aff001; David J. Clarke aff002; Alain Givaudan aff001; Julien Brillard aff001
Působiště autorů:
DGIMI, INRA, Univ. Montpellier, Montpellier, France
aff001; Department of Microbiology, University College Cork, Cork, Ireland
aff002; Évolution et Diversité Biologique, CNRS, UPS Université Paul Sabatier, Toulouse, France
aff003
Vyšlo v časopise:
PLoS ONE 14(10)
Kategorie:
Research Article
doi:
https://doi.org/10.1371/journal.pone.0212655
Souhrn
Photorhabdus luminescens is an entomopathogenic bacterium found in symbiosis with the nematode Heterorhabditis. Dam DNA methylation is involved in the pathogenicity of many bacteria, including P. luminescens, whereas studies about the role of bacterial DNA methylation during symbiosis are scarce. The aim of this study was to determine the role of Dam DNA methylation in P. luminescens during the whole bacterial life cycle including during symbiosis with H. bacteriophora. We constructed a strain overexpressing dam by inserting an additional copy of the dam gene under the control of a constitutive promoter in the chromosome of P. luminescens and then achieved association between this recombinant strain and nematodes. The dam overexpressing strain was able to feed the nematode in vitro and in vivo similarly as a control strain, and to re-associate with Infective Juvenile (IJ) stages in the insect. No difference in the amount of emerging IJs from the cadaver was observed between the two strains. Compared to the nematode in symbiosis with the control strain, a significant increase in LT50 was observed during insect infestation with the nematode associated with the dam overexpressing strain. These results suggest that during the life cycle of P. luminescens, Dam is not involved the bacterial symbiosis with the nematode H. bacteriophora, but it contributes to the pathogenicity of the nemato-bacterial complex.
Klíčová slova:
Bacterial pathogens – DNA methylation – Insects – Larvae – Nematode infections – Pathogenesis – Plasmid construction – Symbiosis
Zdroje
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