Characterization of the recombination function of coliphage phi 80 as analogous to the recE recombinative pathway of Escherichia coli

Virulent mutants of bacteriophage phi80

We have characterized a collection of 11 phi80 mutants that develop in wild-type lysogenic hosts ("virulent" phenotype). All these carry gross DNA rearrangements affecting the right arm of the phi80 chromosome. Our results are consistent with the notion that phi80 development is negatively controlled by the ineA gene product, encoded by one of a cluster of genes (phi80 immunity) located between the phi80 replication and recombination genes. We describe and assign positions for ineA and other genes within the immunity region.

Genetics of bacteriophage phi 80--a review

The genetic maps of bacteriophage lambda and lambdoid phage phi 80 are compared. The gene organization of phi 80 is very similar to that of lambda, as shown by isolation and characterization of many am, ts and c (clear) mutants of the phage. In general, the essential genes located in the same position on the genetic map of the phages lambda and phi 80 fulfill the same functions. These include the gene clusters coding for the head and tail proteins, genes for DNA synthesis, and the genes controlling lysogeny and late gene expression. The specific regulatory features of phi 80 in relation to the N function of lambda are discussed, but they require further clarification. The two phages differ in immunity specificity, host range, conversion property and temperature sensitivity.