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Initiation of bacteriophage PRD1 DNA replication on single-stranded templates
1Department of Microbiology and Immunology, College of Medicine, University of Arizona Tucson 85724.
Journal of Molecular Biology
|November 20, 1991
Summary
The PRD1 DNA replication origin requires its 3' terminal 15 nucleotides for protein-primed initiation. This suggests distinct steps for origin recognition and priming during DNA replication.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- PRD1 virus DNA replication initiates via a protein-primed mechanism.
- Single-stranded DNA (ssDNA) intermediates are involved in the replication process.
Purpose of the Study:
- To determine the minimal sequence requirements for protein-primed initiation at the PRD1 DNA replication origin.
- To elucidate the distinct steps involved in the initiation of PRD1 DNA replication.
Main Methods:
- In vitro studies using deletion derivatives of the PRD1 replication origin.
- Analysis of template activity to identify essential sequences for priming.
Main Results:
- The 3'-terminal 15 nucleotides of the PRD1 replication origin are sufficient for supporting protein-primed initiation.
- The minimal sequence requirements for origin recognition differ from those for the priming event.
- Additional bases at the 3' end of the template did not affect priming activity.
Conclusions:
- PRD1 DNA replication initiation involves two distinct steps: origin recognition on double-stranded DNA and a priming event on single-stranded DNA.
- The priming site is located internally within the template, with the search initiated from within.