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. 1976 Mar;17(3):776–787. doi: 10.1128/jvi.17.3.776-787.1976

Process of infection with bacteriophage phi X 174 XXXVIII. Replication of phi chi 174 replicative form in vivo.

A Fukuda, R L Sinsheimer
PMCID: PMC515476  PMID: 1255857

Abstract

The replication of bacteriophage phi X 174 replicative-form DNA has been studied by structural analysis of pulse-labeled replicative-intermediate molecules. Such intermediates were identified by pulse-labeling with [13H]thymidine and separated into four major fractions (A, B, C, and D) in a propidium diiodide-cesium chloride buoyand density gradient. Sedimentation analysis of each of these fractions suggests the following features of phi X replicative-form DNA replication in vivo. (i) At the end of one cycle of replication, one daughter replicative form (RFII) contains a nascent plus (+) strand of the unit viral length, and the other daughter RFII contains small fragments of nascent minus (-) strand. (ii) Asymmetry is also associated with production of the first supercoiled RFI after addition of pulse label in that only the minus strand becomes radioactive. (iii) A supercoiled DNA (RFI') seems to occur in vivo. This DNA is observed at a position of greater density in a propidium diiodide-cesium chloride buoyant density gradient than normal RFI. (iv) A novel DNA component is observed, at a density greater than RFI, which releases, in alkali, a plus strand longer (1.5 to 1.7 times) than the unit viral length. These results are discussed in terms of the possible sequence of events in phi X 174 replicative-form replication in vivo.

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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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