Abstract
Satellite bacteriophage P4 requires the products of the late genes of a helper such as P2 in order to grow lytically. The Escherichia coli rpoA109 mutation, which alters the alpha subunit of RNA polymerase, prevents transcription of the late genes of bacteriophage P2. Suppressor mutations that define the P2 ogr gene overcome this block. We found that P4 lytic growth using a P2 ogr+ prophage helper was prevented by the rpoA109 mutation but that this block was overcome when the P2 helper carried the suppressor mutation in the ogr gene. Furthermore, we isolated and characterized four independent mutations in P4, called org, that suppress the E. coli rpoA109 mutation by allowing P4 lytic growth using a P2 ogr+ helper. DNA sequence analysis revealed that the four independent org mutations are identical and that they occur in the P4 delta gene, which codes for a factor that positively regulates the transcription of the P2 and P4 late genes. delta is predicted to code for a basic 166-amino-acid residue protein. Each 83-residue half of the predicted delta gene product is similar to the predicted 72-residue proteins encoded by the ogr gene of P2 and the B gene of phage 186.
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Selected References
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