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- W1951359557 abstract "Attempts to isolate auxotrophic mutants of Legionella pneumophila have been hampered by the complex nutritional composition of the media used to cultivate this organism. We developed a semidefined medium, designated CAA, to facilitate the isolation and characterization of Legionella auxotrophs. Unlike previously described chemically defined media for this organism, L. pneumophila formed colonies on CAA agar. Using this medium, we isolated several independent tryptophan auxotrophs of strain Philadelphia-1 after ethyl methanesulfonate mutagenesis and penicillin enrichment. Trimethoprim selection was used to isolate several independent thymidine-requiring mutants of the same strain. The thymidine auxotrophs exhibited a marked decrease in viability when they were deprived of thymidine. The results of monocyte infection experiments with both the tryptophan and thymidine auxotrophs indicated that the thymidine auxotrophs were incapable of intracellular survival or multiplication. In contrast, the tryptophan auxotrophs grew well in monocyte cultures. The isolation of additional auxotrophic mutants will facilitate the study of the nutritional requirements of L. pneumophila for growth in human mononuclear phagocytes." @default.
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- W1951359557 date "1988-06-01" @default.
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- W1951359557 title "Isolation and characterization of auxotrophic mutants of Legionella pneumophila that fail to multiply in human monocytes" @default.
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- W1951359557 doi "https://doi.org/10.1128/iai.56.6.1449-1455.1988" @default.
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