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Journal of Bacteriology, April 2001, p. 2704-2708, Vol. 183, No. 8
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.8.2704-2708.2001

Sinorhizobium meliloti Plasmid pRm1132f Replicates by a Rolling-Circle Mechanism†

L. R. Barran,* N. Ritchot, and E. S. P. Bromfield

Soils and Crops Research and Development Centre, Agriculture and Agri-food Canada, Sainte-Foy, Quebec, Canada G1V 2J3

Received 3 November 2000/Accepted 26 January 2001

pRm1132f isolated from Sinorhizobium meliloti is a group III rolling-circle-replicating (RCR) plasmid. At least seven of eight open reading frames in the nucleotide sequence represented coding regions. The minimal replicon contained a rep gene and single- and double-stranded origins of replication. Detection of single-stranded plasmid DNA confirmed that pRm1132f replicated via an RCR mechanism.

* Corresponding author. Mailing address: Soils and Crops Research and Development Centre, Agriculture and Agri-food Canada, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada G1V 2J3. Phone: (418) 657-7985, ext. 222. Fax: (418) 657-2402. E-mail: barranlr{at}em.agr.ca.

dagger Contribution no. 679 of the Soils and Crops Research and Development Centre.

Journal of Bacteriology, April 2001, p. 2704-2708, Vol. 183, No. 8
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.8.2704-2708.2001


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