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A bacterial virulence determinant encoded by lysogenic coliphage λ

Nature volume 346, pages 871–874 (1990)Cite this article

Abstract

ALTHOUGH phage λ represents a well studied biological system, it has certain features that remain obscure. Among these is the function of the roughly one third of the phage genome dispensable for growth in the laboratory, yet retained despite undoubted pressure to economize1. Here we report that these 'accessory' sequences contain two genes which are expressed during lysogeny, and encode host-cell envelope proteins. One of these is lom (ref. 2), the product of which is found in the bacterial outer membrane, and is homologous to virulence proteins of two other enterobacterial genera. The other gene, previously unidentified, we designate bor. Expression of bor significantly increases the survival of the Escherischia coli host cell in animal serum. This property is a well known bacterial virulence determinant3,4—indeed, bor and its adjacent sequences are highly homologous to the iss serum resistance locus of the plasmid ColV2-K94, which confers virulence in animals5,6. These results show that the λ prophage is more tran-scriptionally active than has long been assumed, and suggest that lysogeny may generally have a role in bacterial survival in animal hosts, and perhaps in pathogenesis.

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Authors and Affiliations

  1. Program in Cell and Developmental Biology, Harvard Medical School, Boston, Massachusetts, 02115, USA

    James J. Barondess

  2. Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts, 02115, USA

    James J. Barondess & Jon Beckwfth

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  1. James J. Barondess
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  2. Jon Beckwfth
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Barondess, J., Beckwfth, J. A bacterial virulence determinant encoded by lysogenic coliphage λ. Nature 346, 871–874 (1990). https://doi.org/10.1038/346871a0

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