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. 1978 Dec;28(3):725–735. doi: 10.1128/jvi.28.3.725-735.1978

Control of Replication in RNA Bacteriophages

Paul Pumpen 1, Viestur Bauman 1, Andris Dishler 1, Elmar J Gren 1
PMCID: PMC525796  PMID: 366178

Abstract

The rates of viral RNA and protein syntheses for wild-type RNA bacteriophages and their nonpolar, coat protein amber mutants were determined in amber suppressor (S26R1E, Su-1 and H12R8a, Su-3) and nonsuppressor (AB259, S26, and Q13) strains of Escherichia coli in the presence of rifamycin. It was demonstrated that the rates of synthesis of phage-specific replicase and RNA minus strands drop off concurrently in both wild-type and coat protein mutant-infected Su− and Su+ cells after 10 and 15 min postinfection, respectively. The rate of synthesis of RNA plus strands started to decline 5 to 10 min later in both cases. Excessive synthesis of replicase in the coat protein mutant-infected cells was accompanied by a similar overproduction of RNA minus strands, but not of plus strands. Partial suppression of protein synthesis in wild-type phage-infected cells abolishing coat protein control over replicase accumulation led to prolongation of replicase synthesis. Such an effect was observed also in coat protein mutant-infected cells, indicating that the excess of replicase itself may be capable of suppression of replicase synthesis in the absence of coat protein. The prolongation of replicase synthesis was followed by the prolonged synthesis of RNA minus strands in both cases. Moreover, replicase and minus strands were formed in nearly equal amounts when protein synthesis was partially inhibited. Assuming functional instability of phage RNAs, the observed coupling of replicase and minus-strand RNA synthesis offers a possibility for control of viral RNA replication by means of control of replicase synthesis on the translational level. A hypothesis is put forward to explain the molecular mechanism of such coupling between the syntheses of replicase and RNA minus strands.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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