Plant Molecular Biology

, Volume 64, Issue 5, pp 601–611 | Cite as

Biochemical properties of a plastidial DNA polymerase of rice

  • Ryo TakeuchiEmail author
  • Seisuke Kimura
  • Ai Saotome
  • Kengo Sakaguchi


Plastids are organelles unique to plant cells and are responsible for photosynthesis and other metabolic functions. Despite their important cellular roles, relatively little is known about the mechanism of plastidial DNA replication and repair. Recently, we identified a novel DNA polymerase in Oryza Sativa L. (OsPOLP1, formerly termed OsPolI-like) that is homologous to prokaryotic DNA polymerase Is (PolIs), and suggested that this polymerase might be involved in plastidial DNA replication and repair. Here, we propose to rename the plant PolI homologs as DNA polymerase π (POLP), and investigate the biochemical properties of full-length OsPOLP1. The purified OsPOLP1 elongated both DNA and RNA primer hybridized to a DNA template, and possessed a 3′ exonuclease activity. Moreover, OsPOLP1 displayed high processivity and fidelity, indicating that this polymerase has the biochemical characteristics appropriate for DNA replication. We found that POLPs have two extra sequences in the polymerase domain that are absent in prokaryotic PolIs. Deletion of either insert from OsPOLP1 caused a decrease in DNA synthetic activity, processivity, and DNA binding activity. In addition, OsPOLP1 efficiently catalyzed strand displacement on nicked DNA with a 5′-deoxyribose phosphate, suggesting that this enzyme might be involved in a repair pathway similar to long-patch base excision repair. These results provide insights into the possible role of POLPs in plastidial DNA replication and repair.


DNA polymerase π DNA repair DNA replication  Oryza sativa LPlastid Processivity 



DNA polymerase


DNA polymerase π


Glutathione S-transferase

E. coli

Escherichia coli




Base excision repair


5′-deoxyribose phosphate



We thank Dr. Kei-ichi Takata (University of Pittsburgh Cancer Institute, Hillman Cancer Center, Research Pavilion, Pittsburgh, PA) for the helpful discussion of this work. R.T. and S.K. were supported by Research Fellowships of the Japan Society for the Promotion of Science.

Supplementary material

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11103_2007_9179_MOESM2_ESM.doc (50 kb)
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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Ryo Takeuchi
    • 1
    Email author
  • Seisuke Kimura
    • 1
  • Ai Saotome
    • 1
  • Kengo Sakaguchi
    • 1
  1. 1.Department of Applied Biological Science, Faculty of Science and TechnologyTokyo University of ScienceNoda-shiJapan

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