title: Drosophila DNA polymerase zeta interacts with recombination repair protein 1, the Drosophila homologue of human abasic endonuclease 1.
abstract: Abasic (AP) sites are a threat to cellular viability and genomic integrity, since they impede transcription and DNA replication. In mammalian cells, DNA polymerase (pol) beta plays an important role in the repair of AP sites. However, it is known that many organisms, including Drosophila melanogaster, do not have a pol beta homologue, and it is unclear how they repair AP sites. Here, we screened for DNA polymerases that interact with the Drosophila AP endonuclease 1 homologue, Rrp1 (recombination repair protein 1), and found that Drosophila pol zeta (Dmpol zeta), DmREV3 and DmREV7 bound to Rrp1 in a protein affinity column. Rrp1 directly interacted with DmREV7 in vitro and in vivo but not with DmREV3. These findings suggest that the DNA polymerase partner for Rrp1 is Dmpol zeta and that this interaction occurs through DmREV7. Interestingly, DmREV7 bound to the N-terminal region of Rrp1, which has no known protein homologue, suggesting that this binding is a species-specific event. Moreover, DmREV7 could stimulate the AP endonuclease activity of Rrp1, but not the 3'-exonuclease activity, and form a homomultimer. DmREV3 could not incorporate nucleotides at the 5'-incised tetrahydrofran sites but did show strand displacement activity for one-nucleotide-gapped DNA, which was not influenced by either DmREV7 or Rrp1. Methyl methanesulfonate and hydrogen peroxide treatments increased mRNA levels of DmREV3 and DmREV7. On the basis of the direct interaction between DmREV7 and Rrp1, we suggest that Dmpol zeta may be involved in the repair pathway of AP sites in DNA.
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Takeuchi
authors.forename: Tatsushi
authors.initials: T
authors.lastname: Ruike
authors.forename: Ryo-ichi
authors.initials: R
authors.lastname: Nakamura
authors.forename: Kaori
authors.initials: K
authors.lastname: Shimanouchi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kanai
authors.forename: Yoko
authors.initials: Y
authors.lastname: Abe
authors.forename: Ayumi
authors.initials: A
authors.lastname: Ihara
authors.forename: Kengo
authors.initials: K
authors.lastname: Sakaguchi
mesh_terms: D000818:Animals; D001483:Base Sequence; D004260:DNA Repair; D004259:DNA-Directed DNA Polymerase / Q000235:genetics / Q000378:metabolism; D003850:Deoxyribonuclease I / Q000378:metabolism; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000201:enzymology* / Q000235:genetics; D005260:Female; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008741:Methyl Methanesulfonate / Q000494:pharmacology; D008969:Molecular Sequence Data; D009713:Nucleotidyltransferases / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger; D011995:Recombination, Genetic
chemical_list: D029721:Drosophila Proteins; D012333:RNA, Messenger; D008741:Methyl Methanesulfonate; D006861:Hydrogen Peroxide; C425929:DNA polymerase zeta; D009713:Nucleotidyltransferases; C061900:Rrp1 protein, Drosophila; D004259:DNA-Directed DNA Polymerase; D003850:Deoxyribonuclease I