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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1990 Jul;172(7):3549–3558. doi: 10.1128/jb.172.7.3549-3558.1990

Bacteriophage P2 ogr and P4 delta genes act independently and are essential for P4 multiplication.

C Halling 1, R Calendar 1
PMCID: PMC213327  PMID: 2193911

Abstract

Satellite bacteriophage P4 requires the products of the late genes of a helper phage such as P2 for lytic growth. Expression of the P2 late genes is positively regulated by the P2 ogr gene in a process requiring P2 DNA replication. Transactivation of P2 late gene expression by P4 requires the P4 delta gene product and works even in the absence of P2 DNA replication. We have made null mutants of the P2 ogr and P4 delta genes. In the absence of the P4 delta gene product, P4 multiplication required both the P2 ogr protein and P2 DNA replication. In the absence of the P2 ogr gene product, P4 multiplication required the P4 delta protein. In complementation experiments, we found that the P2 ogr protein was made in the absence of P2 DNA replication but could not function unless P2 DNA replicated. We produced P4 delta protein from a plasmid and found that it complemented the null P4 delta and P2 ogr mutants.

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Selected References

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