Human DNA polymerase theta possesses 5'-dRP lyase activity and functions in single-nucleotide base excision repair in vitro

Nucleic Acids Res. 2009 Apr;37(6):1868-77. doi: 10.1093/nar/gkp035. Epub 2009 Feb 2.


DNA polymerase theta (Pol theta) is a low-fidelity DNA polymerase that belongs to the family A polymerases and has been proposed to play a role in somatic hypermutation. Pol theta has the ability to conduct translesion DNA synthesis opposite an AP site or thymine glycol, and it was recently proposed to be involved in base excision repair (BER) of DNA damage. Here, we show that Pol theta has intrinsic 5'-deoxyribose phosphate (5'-dRP) lyase activity that is involved in single-nucleotide base excision DNA repair (SN-BER). Full-length human Pol theta is a approximately 300-kDa polypeptide, but we show here that the 98-kDa C-terminal region of Pol theta possesses both DNA polymerase activity and dRP lyase activity and is sufficient to carry out base excision repair in vitro. The 5'-dRP lyase activity is independent of the polymerase activity, in that a polymerase inactive mutant retained full 5'-dRP lyase activity. Domain mapping of the 98-kDa enzyme by limited proteolysis and NaBH(4) cross-linking with a BER intermediate revealed that the dRP lyase active site resides in a 24-kDa domain of Pol theta. These results are consistent with a role of Pol theta in BER.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Catalytic Domain
  • DNA Polymerase theta
  • DNA Repair*
  • DNA-Directed DNA Polymerase / chemistry
  • DNA-Directed DNA Polymerase / metabolism*
  • Humans
  • Kinetics
  • Peptides / chemistry
  • Phosphorus-Oxygen Lyases / chemistry
  • Phosphorus-Oxygen Lyases / metabolism*
  • Protein Structure, Tertiary


  • Peptides
  • 5'-deoxyribose phosphate lyase
  • DNA-Directed DNA Polymerase
  • Phosphorus-Oxygen Lyases