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Secretion Systems in Entomopathogens

Bacteria in Xenorhabdus and Photorhabdus genus are symbiotically associated with obligate insect pathogenic Steinernema and Heterorhabditis nematodes. Xenorhabdus and Photorhabdus bacteria can secrete toxins, exoenzymes


, and proteins for immune evasion and subsequent killing of insects. Some of these proteins are secreted via particular protein secretion systems in entomopathogenic Gram-negative bacteria. However, secretion systems in the entomopathogenic Xenorhabdus spp. and Photorhabdus spp. have not been identified completely. To understand the distribution of secretion systems among the Xenorhabdus and Photorhabdus genomes, we conducted a comprehensive comparative analysis of secretion systems (Type I-VI). We expected to improve our understanding of the distribution of secretion systems by a comparative analysis of the Xenorhabdus and Photorhabdus genomes.