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pUb6060: a broad-host-range, DNA polymerase-I-independent ColE2-like plasmid
M B Avison1, T R Walsh, P M Bennett
1Department of Pathology and Microbiology, Bristol Centre for Antimicrobial Research and Evaluation, Bristol, BS8 1TD, United Kingdom. Avison@bris.ac.uk
Abstract:
A ColE2-like, cryptic plasmid, pUB6060, of 5.8 kb has been found in a clinical isolate of Plesiomonas shigelloides. The complete sequence of pUB6060 has been determined and reveals a number of interesting features about the plasmid. The ColE2-like replication locus is linked to a functional ColE1-like mobilization locus. Replication is, unusually for ColE2 replicons, DNA polymerase-I-independent and may involve two, rather than the usual one, plasmid-encoded functions. Additionally, it carries two ORFs encoding products of unknown function. The pUB6060 replicon maintains a moderate plasmid copy number (10 per chromosome copy) and permits replication in diverse gram-negative bacteria.