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Bacterial Symbiosis, pathogenesis, phenotypic variation, mutualism,

Kimberly N Cowles, Charles E Cowles, Gregory R Richards, Eric C Martens, Heidi Goodrich-Blair
Xenorhabdus nematophila is a Gram-negative bacterium that leads both pathogenic and mutualistic lifestyles. In this study, we examine the role of Lrp, the leucine-responsive regulatory protein, in regulating both of these lifestyles. lrp mutants have attenuated virulence towards Manduca sexta insects and are defective in suppression of both cellular and humoral insect immunity. In addition, an lrp mutant is deficient in initiating colonization of and growth within mutualistic host nematodes. Furthermore, nematodes reared on lrp mutant lawns exhibit decreased overall numbers of nematode progeny...
May 2007: Cellular Microbiology
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