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. 1975 Aug;16(2):330–339. doi: 10.1128/jvi.16.2.330-339.1975

Synthesis of functional bacteriophage T4-delayed early mRNA in the absence of protein synthesis.

J W Morse, P S Cohen
PMCID: PMC354672  PMID: 168406

Abstract

When Escherichia coli B207 is grown either aerobically or under limited aerobic conditions, pretreated with chloramphenicol to block protein synthesis, and then infected with bacteriophage T4, the phage RNA which accumulates, termed "immediately early" (IE), contains the transcripts of a limited number of prereplicative genes. Among the transcripts which accumulate is the mRNA which serves as a template for deoxycytidylate hydroxymethylase (HMase) synthesis. Among the prereplicative gene transcripts which do not accumulate under these conditions are deoxycytidine triphosphatase (dCTPase), alpha-glucosyl transferase (alphg-gt), and deoxynucleotide kinase (kinase); these genes have been termed "delayed early" (DE). In contrast, when protein synthesis is inhibited by depleting aerobically grown E. coli B207 of K+, both IE and DE T4 RNA accumulate, but these transcripts do not contain functional HMase, dCTPase, alpha-gt, or kinase mRNA's. However, if E. coli is grown under conditions of limited aeration and then depleted of K+ prior to T4 infection, the T4 RNA which accumulates contains both IE and DE transcripts and functional HMase, dCTPase, and alpha-gt mRNA's. Functional kinase mRNA does not accumulate under these conditions. The results of these experiments indicate that the synthesis of functional DE RNA in the absence of simultaneous protein synthesis, depends on the physiological condition of the cells and the way in which protein synthesis is inhibited. In addition, data is presented which suggests that extensive transcription of DE genes in the absence of protein synthesis results in the inhibition of transcription of certain IE genes.

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Selected References

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