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Journal of Bacteriology, September 2007, p. 6333-6338, Vol. 189, No. 17
0021-9193/07/$08.00+0     doi:10.1128/JB.00599-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

The Antirepressor Needed for Induction of Linear Plasmid-Prophage N15 Belongs to the SOS Regulon{triangledown}

Andrey V. Mardanov and Nikolai V. Ravin*

Centre "Bioengineering," Russian Academy of Sciences, Moscow, 117312, Russia

Received 18 April 2007/ Accepted 13 June 2007

The physiological conditions and molecular interactions that control phage production have been studied in only a few families of temperate phages. We investigated the mechanisms that regulate activation of lytic development in lysogens of coliphage N15, a prophage that is not integrated into the host chromosome but exists as a linear plasmid with covalently closed ends. We identified the N15 antirepressor gene, antC, and showed that its product binds to and acts against the main phage repressor, CB. LexA binds to and represses the promoter of antC. Mitomycin C-stimulated N15 induction required RecA-dependent autocleavage of LexA and expression of AntC protein. Thus, a cellular repressor whose activity is regulated by DNA damage controls N15 prophage induction.

* Corresponding author. Mailing address: Centre "Bioengineering," Russian Academy of Sciences, Prosp. 60-let Oktiabria, Bldg.7-1, Moscow 117312, Russia. Phone: (7) 495 1374305. Fax: (7) 495 1350571. E-mail: nravin{at}biengi.ac.ru

{triangledown} Published ahead of print on 22 June 2007.

Journal of Bacteriology, September 2007, p. 6333-6338, Vol. 189, No. 17
0021-9193/07/$08.00+0     doi:10.1128/JB.00599-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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