Abstract
Several beta-lactamase-producing, penicillin-resistant strains of Neisseria gonorrhoeae were examined for R plasmids. Penicillin-resistant strains isolated from men returning from the Far East and their contacts contained a 4.4 x 10(6)-dalton plasmid in common. Transformation studies and the isolation of a spontaneous penicillin-susceptible segregant showed that the structural gene for beta-lactamase was part of the 4.4 x 10(6)-dalton plasmid. An additional penicillin-resistant gonococcal strain isolated in London was found to harbor a 3.2 x 10(6)-dalton R plasmid. Deoxyribonucleic acid (DNA)-DNA duplex studies revealed that the penicillin-resistant gonococcal isolates contained a significant portion (about 40%) of the transposable DNA sequence, TnA, which includes the beta-lactamase gene commonly found on R plasmids of the Enterobacteriaceae and Haemophilus influenzae.
MeSH Terms
DNA, Bacterial/analysis
Drug Resistance, Microbial
Electrophoresis, Agar Gel
Extrachromosomal Inheritance
Genes
Neisseria gonorrhoeae/analysis,enzymology
Nucleic Acid Hybridization
Penicillin Resistance
Penicillinase/biosynthesis
Plasmids
R Factors
Chemicals
DNA, Bacterial
Penicillinase
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Elwell L P
Roberts M
Mayer L W
Falkow S
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