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Comparative Study
. 1993 Dec 15;90(24):11668-72.
doi: 10.1073/pnas.90.24.11668.

A fourth class of theta-replicating plasmids: the pAM beta 1 family from gram-positive bacteria

C Bruand  1 , E Le Chatelier, S D Ehrlich, L Jannière
Affiliations
Comparative Study

A fourth class of theta-replicating plasmids: the pAM beta 1 family from gram-positive bacteria

C Bruand et al. Proc Natl Acad Sci U S A. .

Abstract

Plasmid pAM beta 1 from Enterococcus faecalis uses a unidirectional theta mode of replication. We show here that this replication (i) is dependent on a plasmid-encoded replication protein (Rep) but not on a DNA structure typical for origins of most Rep-dependent plasmids and (ii) is initiated by DNA polymerase I (PolI). pAM beta 1 minimal replicon shares no homology with highly conserved ColE1-type replicons, which use PolI for initiation but do not encode a Rep, or with ColE2 and ColE3 replicons, which require PolI for replication and encode a Rep. We propose that pAM beta 1 and a number of other naturally occurring and closely related plasmids from a distinct plasmid class.

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