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The transcriptional units in the basic replicon of plasmid R1 were defined by means of gene fusions. It was found that in the wild-type plasmid there is one large mRNA encoding both the control factor copB and the positive replication factor repA. A second, internal transcription initiation site, the repA promoter, is usually repressed by the copB protein, and is therefore only of significance in the absence of this control factor. By induction of the repA promoter through gradual dilution of the copB repressor it was shown that translation of repA-mRNA, controlled by the copA-RNA, is significantly increased only when the rate of repA transcription is above a certain level. No indication was found for a possible interference from convergent copA transcription on repA transcription.
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