Recombination-deficient mutants of Salmonella typhimurium are avirulent and sensitive to the oxidative burst of macrophages |
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| Authors: | Nancy A. Buchmeier Craig J. Lipps Magdalene Y. H. So Fred Heffron |
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| Affiliation: | Department of Pathology, University of California, San Diego, California 9203, USA.;Department of Microbiology and Immunology, Oregon Health Sciences University, Portland, Oregon 97201, USA. |
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| Abstract: | ![]()
Mutations in the genes recA and recBC were constructed in the virulent Salmonella typhimurium strain 14028s. Both the recA and recBC mutants were attenuated in mice. The mutants were also sensitive to killing by macrophages in vitro. The recombination mutants were no longer macrophage sensitive in a variant line of J774 macrophage-like cells that fail to generate superoxide. This suggests that repair of DNA damage by Salmonella is necessary for full virulence in vivo and that the oxidative burst of phagocytes is one source of such DNA damage. |
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