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Some bacterial pathogens produce chitinases as virulence factors during host infection. The molecular target of such enzymes in non-chitinous hosts remains uncertain. We studied the importance of Listeria monocytogenes EGD-e and Salmonella enterica ser. Typhimurium LT2 chitinases for intracellular survival in Dictyostelium discoideum, and for Salmonella, also infection of mammalian cell lines, and a mouse model. The Salmonella chitinase did not contribute significantly to infection of D. discoideum, mammalian cell lines or mice. However, survival in D. discoideum was clearly reduced for Listeria mutants deficient of ChiB (8-fold) or deficient of both ChiA and ChiB (22-fold). Our findings suggest that chitinases from the two species play different roles in virulence.

fems microbiology letters

Effects of Listeria monocytogenes EGD-e and Salmonella enterica ser. Typhimurium LT2 chitinases on intracellular survival in Dictyostelium discoideum and mammalian cell lines