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• W1485457797 abstract "Late in the life cycle of the single-stranded DNA phage phi X, the synthesis of positive strand DNA is coupled to the maturation of progeny virions. DNA synthesis and packaging take place in a replication-assembly complex, which we have purified to homogeneity and characterized. The following conclusions can be drawn: 1. The DNA component of the replication-assembly complex is a rolling circle with a single-stranded DNA tail which is less than or equal to genome length. 2. The major protein component of the replication-assembly complex is an intact viral capsid, as shown by gel analysis of 35S-labeled complexes. As replication proceeds at the DNA growing point, the positive strand tail of the rolling circle is displaced directly into the capsid. In addition to the capsid, the complex contains at least 1 molecule of the phi X gene A nicking protein, which appears to be covalently linked to the DNA. 3. The rolling circle . capsid complex can be purified to homogeneity by taking advantage of its uniform sedimentation velocity (35 S) and its uniform density upon equilibrium centrifugation in CsCl (1.50 g/cc). 4. The replication-assembly complex can be visualized in the electron microscope. An electron-dense particle, which has the dimensions of a viral capsid, is observed attached to a rolling circle at the DNA growing point. 5. Hybridization of specific phi X restriction fragments to the deproteinized, single-stranded tails of intact rolling circles has allowed the use of these replicating intermediates to determine both the origin/terminus and the direction of phi X positive strand DNA synthesis. The ends of the rolling circle tails map in the Hae III restriction Fragment Z6b, at the position on the phi X genome at which the gene A endonuclease is known to cut. This result indicates that this endonuclease participates in the termination of each round of synthesis by cutting off unit-length viral genomes. 6. Rolling circle . capsid complexes were also isolated from two other icosahedral, single-stranded DNA phages: G4 and St-1. The rolling circle . capsid complex seen in the case of the single-stranded DNA phages represents the first example of a structure in which DNA synthesis and viral assembly occur in a coupled manner. This tight coordination explains why double-stranded DNA circles are the net product of synthesis early in the viral life cycle while only single-stranded DNA circles are produced later. The single-stranded tails of the rolling circle intermediates are available for conversion to the duplex state at early times, whereas the concentration of preformed capsids later is high enough to bind to all of the replicating molecules and package the emerging positive strand DNA." @default.
• W1485457797 created "2016-06-24" @default.
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• W1485457797 date "1980-05-01" @default.
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• W1485457797 title "The rolling circle . capsid complex as an intermediate in phi X DNA replication and viral assembly." @default.
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• W1485457797 doi "https://doi.org/10.1016/s0021-9258(19)85669-7" @default.
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