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Research Article

The oriT region of the conjugative transfer system of plasmid pCU1 and specificity between it and the mob region of other N tra plasmids.

E S Paterson, V N Iyer
E S Paterson
Department of Biology and Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada.
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V N Iyer
Department of Biology and Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada.
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DOI: 10.1128/jb.174.2.499-507.1992
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ABSTRACT

The oriT region of the conjugative IncN plasmid pCU1 has been localized to a 669-bp sequence extending from pCU1 coordinates 8.48 to 9.15 kb. The nucleotide sequence of this region was determined. The region is AT-rich (69% AT residues), with one 19-bp and one 81-bp sequence containing 79% or more AT residues. Prominent sequence features include one set of thirteen 11-bp direct repeats, a second set of two 14-bp direct repeats, six different inverted repeat sequences ranging from 6 to 10 bp in size, and two sequences showing 12 of 13 nucleotides identical to the consensus integration host factor binding sequence. Specificity between this oriT and mobilization (mob) functions encoded by the N tra system was demonstrated. This specificity is encoded by the region lying clockwise of the BglII site at coordinate 3.3 on the pCU1 map. Two N tra plasmids isolated in the preantibiotic era were unable to mobilize recombinant plasmids carrying the oriT region of pCU1 or to complement transposon Tn5 mutations in the mob region of the closely related plasmid pKM101.

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The oriT region of the conjugative transfer system of plasmid pCU1 and specificity between it and the mob region of other N tra plasmids.
E S Paterson, V N Iyer
Journal of Bacteriology Jan 1992, 174 (2) 499-507; DOI: 10.1128/jb.174.2.499-507.1992

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The oriT region of the conjugative transfer system of plasmid pCU1 and specificity between it and the mob region of other N tra plasmids.
E S Paterson, V N Iyer
Journal of Bacteriology Jan 1992, 174 (2) 499-507; DOI: 10.1128/jb.174.2.499-507.1992
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