title: Biochemical properties and base excision repair complex formation of apurinic/apyrimidinic endonuclease from Pyrococcus furiosus.
abstract: Apurinic/apyrimidinic (AP) sites are the most frequently found mutagenic lesions in DNA, and they arise mainly from spontaneous base loss or modified base removal by damage-specific DNA glycosylases. AP sites are cleaved by AP endonucleases, and the resultant gaps in the DNA are repaired by DNA polymerase/DNA ligase reactions. We identified the gene product that is responsible for the AP endonuclease activity in the hyperthermophilic euryarchaeon, Pyrococcus furiosus. Furthermore, we detected the physical interaction between P. furiosus AP endonuclease (PfuAPE) and proliferating cell nuclear antigen (PCNA; PfuPCNA) by a pull-down assay and a surface plasmon resonance analysis. Interestingly, the associated 3'-5' exonuclease activity, but not the AP endonuclease activity, of PfuAPE was stimulated by PfuPCNA. Immunoprecipitation experiments using the P. furiosus cell extracts supported the interaction between PfuAPE and PfuPCNA in the cells. This is the first report describing the physical and functional interactions between an archaeal AP endonuclease and PCNA. We also detected the ternary complex of PfuPCNA, PfuAPE and Pfu uracil-DNA glycosylase. This complex probably functions to enhance the repair of uracil-containing DNA in P. furiosus cells.
authors.affiliation: Department of Genetic Resources Technology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, BIRD-Japan Science and Technology Agency, Fukuoka-shi, Fukuoka, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kiyonari
authors.forename: Saki
authors.initials: S
authors.lastname: Tahara
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Shirai
authors.forename: Shigenori
authors.initials: S
authors.lastname: Iwai
authors.forename: Sonoko
authors.initials: S
authors.lastname: Ishino
authors.forename: Yoshizumi
authors.initials: Y
authors.lastname: Ishino
mesh_terms: D000595:Amino Acid Sequence; D004260:DNA Repair; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D005092:Exonucleases / Q000378:metabolism; D020745:Genome, Archaeal; D008969:Molecular Sequence Data; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D020027:Pyrococcus furiosus / Q000201:enzymology*
chemical_list: D018809:Proliferating Cell Nuclear Antigen; D005092:Exonucleases; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase