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J Bacteriol. 1962 September; 84(3): 581-589
Copyright © 1962, The Williams & Wilkins Company. All Rights Reserved.

EPISOMIC ELEMENT IN A STRAIN OF SALMONELLA TYPHOSA

Division of Communicable Disease and Immunology, Walter Reed Army Institute of Research, Washington, D.C.

ABSTRACT

FALKOW, STANLEY (Walter Reed Army Institute of Research, Washington, D.C.) AND L. S. BARON. Episomic element in a strain of Salmonella typhosa. J. Bacteriol. 84:581–589. 1962.—An episomic element, F₀-lac⁺, has been identified in a strain of Salmonella typhosa isolated from a natural habitat. The F₀-lac⁺ element is transferred at high frequency as a single unit of transmission and replication without linkage to any other genetic character. Cells receiving F₀-lac⁺ are heterogenotes as if F₀-lac⁺ is not integrated as part of the linear structure of the chromosome, but rather replicates autonomously or in some other association with the genome. Evidence from complementation tests and transduction experiments is presented that the lac genes carried by F₀ are identical or at least markedly similar to the lac genes of Escherichia coli K-12. The F₀ transmission factor cannot be precisely identified but it does not appear to be phage or colicin. F₀ does exhibit mutual repression with the sex factor, F, of E. coli, and immunological experiments indicate some relationship between F and F₀.

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