Plasmids of serogroup 1 strains ofLegionella pneumophila |
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Authors: | Steven R Johnson William O Schalla |
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Institution: | (1) Bacteriology Division, Center for Infectious Diseases, Centers for Disease Control, Public Health Service, Department of Health and Human Services, 30333 Atlanta, Georgia, USA |
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Abstract: | Twelve strains ofLegionella pneumophila were tested for the presence of plasmid DNA. Three strains, belonging to serogroup 1, had large plasmids of 83.8×106 daltons, as determined by electron microscopy. A fourth strain, also from serogroup 1, had a similar large plasmid in addition to a smaller plasmid. Restriction analysis of plasmid DNA isolated from the strains with a single size plasmid indicated that the plasmids were structurally very similar. The biologic functions of these plasmids are yet to be determined. |
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