The symbiotic pathogenic bacterium Xenorhabdus nematophila produces two distinct intracellular inclusion bodies. The pixA gene, which encodes the 185-residue methionine-rich PixA inclusion body protein, was analyzed in the present study. The pixA gene was optimally expressed under stationary-phase conditions but its expression did not require RpoS. Analysis of a pixA mutant strain showed that P...

The oral toxicity of excretion products of several Photorhabdus and Xenorhabdus strains was tested on two thrips species: Frankliniella occidentalis and Thrips tabaci. Out of 46 Photorhabdus isolates and 6 Xenorhabdus isolates only 6 North American P. temperata isolates were toxic to the thrips species. After 7 days of drinking from P. temperata supernatant a mortality of 90% could be reached. ...

To evaluate the effects of pH control strategy on cell growth and the production of antibiotic (cyclo(2-Me-BABA-Gly)) by Xenorhabdus nematophila and enhance the antibiotic activity. The effects of uncontrolled- (different initial pH) and controlled-pH (different constant pH and pH-shift) operations on cell growth and antibiotic activity of X. nematophila YL00I were examined. Experiments showed ...

Species of Xenorhabdus and Photorhabdus bacteria form mutualistic associations with Steinernema and Heterorhabditis nematodes, respectively and serve as model systems for studying microbe-animal symbioses. Here, we profiled gene expression of Xenorhabdus koppenhoeferi during their symbiotic persistence in the newly formed infective juveniles of the host nematode Steinernema scarabaei through th...

Bacteriocins are bacteriocidal toxins released by almost all bacteria. They are thought to have a narrow range of killing, but as bacteriocin-mediated interactions have been rarely studied at biologically relevant scales, whether this narrow range of action falls mostly within or mostly between coexisting species in natural communities is an open question with important ecological and evolution...

Xenorhahdus lurninescens is a luminous bacterium which is symbiotic with the entomopathogenic nematode Hererorhabdiris. The bacteria play an important role in pathogenesis of insect larvae. Once the nematode enters the larvae, Xennrhabdus spp are released from the gut of the nematode into the hemocoel of the insect. Here both the bacteria and the nematodes proliferate and kill the insect within...

xenorhabdus and photorhabdus are members of the family enterobacteriaceae, and are engaged in a mutualistic association with the entomopathogenic nematodes, steinernema and heterorhabditis, respectively. in the present study, the organic fraction of ethyl acetate bacterial crude extracts of the symbiotic bacteria, xenorhabdus stockiae and photorhabdus luminescens isolated from entomopathogenic ...