A fourth class of theta-replicating plasmids: the pAM beta 1 family from gram-positive bacteria.
basic_science · Level V
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- Record sourced from PubMed, PMID 8265606.
- Also identified by PMC identifier 48045.
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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.
Medical subject headings
- DNA Replication
- DNA-Binding Proteins
- Enterococcus faecalis
- Escherichia coli Proteins
- Gram-Positive Bacteria
- Plasmids
- Replicon
- Repressor Proteins