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. 1982 Jan;149(1):284–293. doi: 10.1128/jb.149.1.284-293.1982

Physical and genetic analysis of deletion mutants of plasmid R91-5 and the cloning of transfer genes in Pseudomonas aeruginosa.

R J Moore, V Krishnapillai
PMCID: PMC216620  PMID: 6274846

Abstract

We isolated deletion mutants of Pseudomonas aeruginosa plasmid R91-5 by both in vitro and in vivo means. Many of the deletion mutants selected on the basis of resistance to donor-specific phages fell into a few groups of apparently identical mutants, although the mutants were nonsibs. By analyzing plasmids with large deletions, we found that the essential replication genes of R91-5 were within a 3.85-kilobase region between coordinates 45.5 and 48.9. The origin of plasmid transfer (oriT) was mapped to a 4.5-kilobase region between coordinates 1.7 and 6.2. We indirectly determined the direction of plasmid transfer from oriT. By combining the data from our analysis of the deletions with data from complementation tests between cloned R91-5 fragments and known reference mutants, we ordered and mapped the 10 known transfer (tra) cistrons of R91-5. All of the tra cistrons mapped within the Tra2 region, and their order was as follows: traX, -Y, -T, -Q, -(V, R), -U, -(S, Z), -W (the cistrons in parentheses could not be ordered with respect to each other).

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Selected References

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