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Conjugative transfer and autonomous replication of a promiscuous IncQ plasmid in the cyanobacterium Synechocystis PCC 6803 Export

Molecular and General Genetics MGG, Vol. 221, No. 1. (1 March 1990), pp. 129-133.

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The promiscuous IncQ plasmid pKT210 (Cmr, Smr) is efficiently transferred by transpecific conjugation from Escherichia coli to the facultatively heterotrophic cyanobacterium Synechocystis PCC6803 when mobilized by a helper plasmid coding for IncP transfer functions. The IncQ plasmid is stably maintained in the cyanobacterium as an autonomously replicating multicopy plasmid with no detectable structural alterations and can be recovered by transformation back to E. coli when using a mcrA mcrB host. Thus, the replicative host-range of IncQ plasmids extends beyond purple bacteria to the distinct procaryotic taxon of cyanobacteria, allowing the use of these small plasmids as convenient cloning vectors in Synechocystis PCC6803 and presumably also in cyanobacteria that are not amenable to genetic transformation. In contrast, an IncQ plasmid bearing the TRP1 gene of Saccharomyces cerevisiae failed to replicate when transferred to that yeast by transformation.


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