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Replication of colicin E1 plasmid DNA in vivo requires no plasmid-encoded proteins.

ABSTRACT

A derivative of bacteriophage lambda containing a colicin E1 plasmid replicon was constructed by recombinant DNA techniques. This phage, lambdacol100, has two functional modes of DNA replication; it can replicate via either plasmid or phage replication systems. lambdacol100 has been used to introduce the colicin E1 plasmid replicon into Escherichia coli previously treated with chloramphenicol to block protein synthesis. Under these conditions, lambdacol100 DNA is replicated normally as a colicin E1 plasmid. This suggests that colicin E1 plasmid replication in vivo does not require any plasmid-encoded proteins.

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