Genetic Structure of an R Factor Conferring Ampicillin Resistance
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概要
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An R factor carrying resistant genes, ampicillin (amp), tetracycline (tet), chloramphenicol (cml), dihydrostreptomycin (str), and sulfanilamide (sul), was analyzed by three genetic techniques: spontaneous segregation, transduetion, and recombination. The R factor was stable in Shigella and Escherichia coli, but in Salmonella the (cml. str. sul) genes were spontaneously lost at a high frequency. Almost all of the transductants with P1 contained the five drug markers, but a very small number of them carried both tet and amp genes, or the (amp. cml. str. sul) genes. In conjugal transfer from a strain carrying a single type of R factor to R+ recipient, the recombination took place between the amp and tet, amp and cml, and between the cml and str genes, at a frequency of 23.5, 39.5, and 3.0%, respectively. Crossover between the amp and transfer (tra) loci was not observed. A circular genetic model is proposed in which the genes are arranged in the order-tet9-tet1-tra. amp-cml-str-.
- 財団法人 学会誌刊行センターの論文
著者
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HASHIMOTO HAJIME
Department of Applied Biology, Faculty of Textile Science & Technology, Shinshu University
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MITSUHASHI SUSUMU
Department of Microbiology, School of Medicine, Gunma University
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MITSUHASHI Susumu
Department of Microbiologr, School of Medicine, Gunma University
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TANAKA TOKUMITSU
Department of Microbiology, School of Medicine
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