Choreography of bacteriophage T7 DNA replication
- PMID: 21907611
- PMCID: PMC3195405
- DOI: 10.1016/j.cbpa.2011.07.024
Choreography of bacteriophage T7 DNA replication
Abstract
The replication system of phage T7 provides a model for DNA replication. Biochemical, structural, and single-molecule analyses together provide insight into replisome mechanics. A complex of polymerase, a processivity factor, and helicase mediates leading strand synthesis. Establishment of the complex requires an interaction of the C-terminal tail of the helicase with the polymerase. During synthesis the complex is stabilized by other interactions to provide for a processivity of 5 kilobase (kb). The C-terminal tail also interacts with a distinct region of the polymerase to captures dissociating polymerase to increase the processivity to >17kb. The lagging strand is synthesized discontinuously within a loop that forms and resolves during each cycle of Okazaki fragment synthesis. The synthesis of a primer as well as the termination of a fragment signal loop resolution.
Copyright © 2011 Elsevier Ltd. All rights reserved.
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