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Primer terminus recognition and highly processive replication by Epstein-Barr virus DNA polymerase
1Laboratory of Virology, Nagoya University School of Medicine, Japan.
The Biochemical Journal
|December 15, 1991
Summary
The Epstein-Barr virus (EBV) DNA polymerase efficiently replicates viral DNA, showing high affinity for RNA primers and processivity. This enzyme is crucial for EBV genome synthesis during the lytic cycle.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Epstein-Barr virus (EBV) DNA polymerase is vital for viral DNA replication during the lytic cycle.
- The enzyme's role in Okazaki fragment synthesis on the lagging strand is suggested by its RNA primer extension efficiency.
Purpose of the Study:
- To investigate the primer recognition and polymerization characteristics of the EBV DNA polymerase.
- To determine the enzyme's processivity and polymerization rate.
Main Methods:
- Competition experiments to assess primer terminus affinity.
- Enzyme activity assays using M13 DNA and synthetic RNA primers.
- Evaluation of ATP independence and salt stimulation effects.
Main Results:
- EBV DNA polymerase exhibits a high affinity for primer termini hybridized to DNA templates.
- ATP is not required for primer recognition or polymerization.
- The enzyme demonstrates exceptionally high processivity (>7200 nucleotides) and a polymerization rate of 12 nucleotides/s.
- Template/primer structure significantly influences enzyme recognition.
Conclusions:
- EBV DNA polymerase possesses unique properties, including high processivity and specific primer recognition, essential for efficient viral genome replication.
- These characteristics are advantageous for rolling-circle DNA replication, a mechanism used for synthesizing multiple EBV genome copies.