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. 1977 Nov;24(2):673–684. doi: 10.1128/jvi.24.2.673-684.1977

Electron microscopic studies of bacteriophage M13 DNA replication.

D P Allison, A T Ganesan, A C Olson, C M Snyder, S Mitra
PMCID: PMC515979  PMID: 916032

Abstract

Intracellular forms of M13 phage DNA isolated after infection of Escherichia coli with wild-type phage have been studied by electron microscopy and ultracentrifugation. The data indicate the involvement of rolling-circle intermediates in single-stranded DNA synthesis. In addition to single-stranded circular DNA, we observed covalently closed and nicked replicative-form (RF) DNAs, dimer RF DNAs, concatenated RF DNAs, RF DNAs with single-stranded tails (theta, rolling circles), and, occasionally, RF DNAs with theta structures. The tails in theta molecules are always single stranded and are never longer than the DNA from mature phage; the proportion of theta to other RF molecules does not change significantly with time after infection. The origin of single-stranded DNA synthesis has been mapped by electron microscopy at a unique location on RF DNA by use of partial denaturation mapping and restriction endonuclease digestion. This location is between gene IV and gene II, and synthesis proceeds in a counterclockwise direction on the conventional genetic map.

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Selected References

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