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. 1971 Oct;8(4):372–387. doi: 10.1128/jvi.8.4.372-387.1971

Role of Genes 46 and 47 in Bacteriophage T4 Reproduction

I. In Vivo Deoxyribonucleic Acid Replication

Junko Hosoda 1, Elaine Mathews 1, Barbara Jansen 1
PMCID: PMC376210  PMID: 4943075

Abstract

Functional proteins coded by genes 46 and 47 are required for (i) continuation of deoxyribonucleic acid (DNA) synthesis in the late period of T4 infection and (ii) production of normal, late replicating DNA which contains strands with a sedimentation coefficient in alkaline sucrose greater than that of mature DNA (73S). Continued DNA synthesis in the late period in the absence of functional genes 46 or 47 can be achieved by inhibiting late protein synthesis either by using bacterio-phage with a second mutation in gene 55 or by adding chloramphenicol to the culture before the decline in the rate of DNA synthesis. However, when functional 46/47 proteins are absent throughout infection, no strands with a sedimentation coefficient greater than 73S (in alkaline sucrose) are produced. This is the case even when DNA synthesis is allowed to continue. DNA arrest is accompanied by conversion of rapidly sedimenting, replicating DNA to slower sedimenting forms. When 46/47 is absent from the beginning of infection, the conversion product has a smaller sedimentation coefficient than mature DNA both in neutral and alkaline sucrose. When DNA arrest occurs midway in infection by heat-inactivating the ts46 enzyme, the conversion product has a sedimentation coefficient (i) the same as mature DNA in both neutral (63S) and alkaline sucrose if capsid assembly is allowed to take place and (ii) close to 63S in neutral sucrose but heterogenous and relatively greater (up to 100S) in alkaline sucrose if capsid assembly is inhibited. The structure of this DNA is unknown.

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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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