Synthetic activity of Sso DNA polymerase Y1, an archaeal DinB-like DNA polymerase, is stimulated by processivity factors proliferating cell nuclear antigen and replication factor C

J Biol Chem. 2001 Dec 14;276(50):47394-401. doi: 10.1074/jbc.M107213200. Epub 2001 Oct 1.


DNA replication efficiency is dictated by DNA polymerases (pol) and their associated proteins. The recent discovery of DNA polymerase Y family (DinB/UmuC/RAD30/REV1 superfamily) raises a question of whether the DNA polymerase activities are modified by accessory proteins such as proliferating cell nuclear antigen (PCNA). In fact, the activity of DNA pol IV (DinB) of Escherichia coli is enhanced upon interaction with the beta subunit, the processivity factor of DNA pol III. Here, we report the activity of Sso DNA pol Y1 encoded by the dbh gene of the archaeon Sulfolobus solfataricus is greatly enhanced by the presence of PCNA and replication factor C (RFC). Sso pol Y1 per se was a distributive enzyme but a substantial increase in the processivity was observed on poly(dA)-oligo(dT) in the presence of PCNA (039p or 048p) and RFC. The length of the synthesized DNA product reached at least 200 nucleotides. Sso pol Y1 displayed a higher affinity for DNA compared with pol IV of E. coli, suggesting that the two DNA polymerases have distinct reason(s) to require the processivity factors for efficient DNA synthesis. The abilities of pol Y1 and pol IV to bypass DNA lesions and their sensitive sites to protease are also discussed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Archaeal Proteins*
  • Bacterial Proteins / chemistry*
  • Bacterial Proteins / metabolism*
  • Binding Sites
  • DNA / metabolism
  • DNA Polymerase beta / chemistry*
  • DNA Polymerase beta / metabolism
  • DNA Primers / pharmacology
  • DNA-Binding Proteins / metabolism*
  • DNA-Directed DNA Polymerase / chemistry*
  • DNA-Directed DNA Polymerase / metabolism*
  • Dose-Response Relationship, Drug
  • Electrophoresis, Polyacrylamide Gel
  • Escherichia coli / enzymology
  • Escherichia coli / metabolism
  • Kinetics
  • Molecular Sequence Data
  • Polymerase Chain Reaction
  • Proliferating Cell Nuclear Antigen / metabolism*
  • Protein Binding
  • Replication Protein C
  • Subtilisin / metabolism
  • Sulfolobus
  • Surface Plasmon Resonance
  • Time Factors


  • Archaeal Proteins
  • Bacterial Proteins
  • DNA Primers
  • DNA-Binding Proteins
  • Proliferating Cell Nuclear Antigen
  • DNA
  • Dbh protein, Sulfolobus solfataricus
  • DNA Polymerase beta
  • DNA-Directed DNA Polymerase
  • Subtilisin
  • Replication Protein C