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DNA replication studies with coliphage 186. III. A single phage gene is required for phage 186 replication.

Sivaprasad A.V., Jarvinen R., Puspurs A., Egan J.B.

We have shown that the BglII to BamHI (79.6% to 95.8%) region of the coliphage 186 chromosome can direct 186-specific replication. DNA sequencing of the region revealed five presumptive genes, CP80, CP81, CP83, CP84 and CP87. Surprisingly, alleles of the previously defined replication gene, A, were localized in both CP84 and CP87. We have successfully constructed a 186 minichromosome using the single gene CP87, and determined that CP84 was not concerned with replication, neither of a minichromosome nor of the phage. Rather, the replication defect seen with amber mutants of CP84 reflects a polarity effect on the downstream expression of CP87. We have concluded that CP87 is the only phage gene necessary for 186 replication, and have called it gene A.

J. Mol. Biol. 213:449-463(1990) [PubMed] [Europe PMC]

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