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. 1977 Jul;131(1):356–362. doi: 10.1128/jb.131.1.356-362.1977

Relationships among some R plasmids found in Haemophilus influenzae.

L P Elwell, J R Saunders, M H Richmond, S Falkow
PMCID: PMC235429  PMID: 301523

Abstract

Tetracycline resistance in a strain of Haemophilus influenzae isolated in the United Kingdom was found to be determined by an apparently non-selftransmissible plasmid of 31 X 10(6) daltons (31 MDal), designated pUB701. Deoxyribonucleic acid hybridization studies indicated that pUB701 shares about 70% base sequence homology with the 30-MDal ampicillin resistance R plasmid RSF007 isolated in the United States from H. influenzae, and 64% sequence homology with the 38-MDal tetracycline and chloramphenicol resistance R plasmid pRI234, isolated in the Netherlands. Heteroduplex studies between RSF007 and pUB701 confirmed the fact that these plasmids were largely homologous, except that pUB701 contained the tetracycline resistance transposon TnD, whereas RSF007 contained the ampicillin resistance transposon TnA. A strain of H. parainfluenzae resistant to both chloramphenicol and tetracycline carried two species of plasmid deoxyribonucleic acid of 2.7 and 0.75 MDal. We were unable to prove that either resistance was plasmid-borne in this strain. Hybridization studies with a [3H]thymine-labeled tetracycline resistance enteric plasmid suggested that the tetracycline transposon was integrated into the chromosome of H. parainfluenzae UB2832. We conclude either that the strains we studied received R factors of the same incompatibility group bearing different resistance genes, or that different resistance genes were translocated to a commom resident plasmid of H. influenzae.

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Selected References

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