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• W2109831629 endingPage "5373" @default.
• W2109831629 startingPage "5361" @default.
• W2109831629 abstract "Legionella pneumophila was mutagenized with Tn903dIIlacZ, and a collection of mutants was screened for defects in macrophage killing (Mak-). Of 4,564 independently derived mutants, 55 (1.2%) showed a reduced or complete lack in the ability to kill HL-60-derived human macrophages. Forty-nine of the Mak- mutants could be assigned to one of 16 DNA hybridization groups. Only one group (9 of the 10 members) could be complemented for macrophage killing by a DNA fragment containing icm and dot, two recently described L. pneumophila loci that are required for macrophage killing. Phenotypic analysis showed that none of the mutants were any more sensitive than the wild type to human serum, oxidants, iron chelators, or lipophilic reagents nor did they require additional nutrients for growth. The only obvious difference between the Mak-mutants and wild-type L. pneumophila was that almost all of the Mak- mutants were resistant to NaCl. The effects of LiCl paralleled the effects of NaCl but were less pronounced. Resistance to salt and the inability to kill human macrophages are linked since both phenotypes appeared when Tn903dIIlacZ mutations from two Mak- strains were transferred to wild-type backgrounds. However, salt sensitivity is not a requisite for killing macrophages since a group of Mak- mutants containing a plasmid that restored macrophage killing remained resistant to NaCl. Mak- mutants from groups I through IX associated with HL-60 cells similarly to wild-type L. pneumophila. However, like the intracellular-multiplication-defective (icm) mutant 25D, the Mak- mutants were unable to multiply within macrophages. Thus, the ability of L. pneumophila to kill macrophages seems to be determined by many genetic loci, almost all of which are associated with sensitivity to NaCl." @default.
• W2109831629 created "2016-06-24" @default.
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• W2109831629 date "1993-12-01" @default.
• W2109831629 modified "2023-10-15" @default.
• W2109831629 title "Identification of Legionella pneumophila genes required for growth within and killing of human macrophages" @default.
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• W2109831629 doi "https://doi.org/10.1128/iai.61.12.5361-5373.1993" @default.
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