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Journal of Bacteriology, October 2007, p. 7045-7052, Vol. 189, No. 19
0021-9193/07/$08.00+0     doi:10.1128/JB.00243-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Evolution of Microcin V and Colicin Ia Plasmids in Escherichia coli{triangledown}

Anne Jeziorowski{dagger} and David M. Gordon*

School of Botany & Zoology, The Australian National University, Canberra, ACT 0200, Australia

Received 13 February 2007/ Accepted 12 July 2007

Survey results and genotypic characterization of Escherichia coli strains demonstrate that the bacteriocins colicin Ia and microcin V coassociate in a strain more often than would be expected by chance. When these two bacteriocins co-occur, they are encoded on the same conjugative plasmid. Plasmids encoding colicin Ia and microcin V are nonrandomly distributed with respect to the genomic background of the host strain. Characterization of microcin V and colicin Ia nucleotide variation, together with the backbone of plasmids encoding these bacteriocins, indicates that the association has evolved on multiple occasions and involves the movement of the microcin V operon, together with the genes iroNEDCB and iss, onto a nonrandom subset of colicin Ia plasmids. The fitness advantage conferred on cells encoding both colicin Ia and microcin V has yet to be determined.

* Corresponding author. Mailing address: School of Botany & Zoology, The Australian National University, Canberra, ACT 0200 Australia. Phone: 61 2 6125 3552. Fax: 61 2 6125 5573. E-mail: David.Gordon{at}anu.edu.au

{triangledown} Published ahead of print on 20 July 2007.

{dagger} Present address: Department of Genetics, University of Melbourne, 3010 Australia.

Journal of Bacteriology, October 2007, p. 7045-7052, Vol. 189, No. 19
0021-9193/07/$08.00+0     doi:10.1128/JB.00243-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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