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. 1986 Jul;167(1):336–345. doi: 10.1128/jb.167.1.336-345.1986

Cloning, mapping, and sequencing of plasmid R100 traM and finP genes.

B E Fee, W B Dempsey
PMCID: PMC212880  PMID: 3522549

Abstract

The fertility control gene finP, the transfer gene traM, and the transfer origin, oriT, of plasmid R100 were isolated on a single 1.2-kilobase EcoRV fragment and were then subcloned as HaeIII fragments. The sequence of the 754-base-pair finP-containing fragment is reported here. In addition to the finP gene, the sequence includes all but two bases of the R100 traM open reading frame and apparently all of the leader mRNA sequence and amino end of the traJ gene of R100. The sequence contains two open reading frames which encode small proteins on the opposite strand from the traM and traJ genes. It also shows two sets of inverted repeats that have the characteristics of transcription terminators. One set is positioned as if it was the traM terminator, and the other set, which is downstream from the first, sits in the middle of the leader mRNA sequence for traJ. On the bottom strand, this inverted repeat has the structure of a rho-independent terminator. Other less-stable inverted repeats overlap this second terminator in the same way as is seen in attenuation sequences, and the two separate small open reading frames on the bottom strand also totally overlap the stem of the rho-independent terminator, suggesting that their translation would cause shifting of termination to the bottom strand homolog of the putative traM terminator. The finP gene product was not identified, but the gene was mapped to the sequence which contains the traJ gene. It either overlaps traJ or is antisense to it.

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Selected References

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