[Flap endonuclease-1 and its role in the processes of DNA metabolism in eucaryotic cells]

Mol Biol (Mosk). 2008 May-Jun;42(3):405-21.
[Article in Russian]


Flap endonuclease-1 (FEN1) is a structure specific endonuclease. The natural substrates of FEN1 are 5'-flap structures formed by three DNA chains one of them has unannealed flapped 5'-end (flap). Flap structures are the intermediates of different processes of DNA metabolism, such as DNA recombination, Okazaki fragment maturation during replication of lagging strand, as well as strand displacement DNA synthesis in base excision repair. FEN1 also possesses 5'-exonuclease activity and newly discovered gap endonuclease activity. FEN1 is known to interact physically and functionally with a number of DNA replication and repair proteins such as the proliferating cell nuclear antigen, helicase/nuclease Dna2, WRN and BLM proteins, replication protein A, apurinic/apyrimidinic endonuclease 1, DNA polymerase beta, poly(ADP-riboso) polymerase 1, high mobility group protein 1, integrase of human immunodeficiency virus, transcription coactivator p300, chromatin proteins, cyclin-dependent kinases (Cdk1, Cdk2, Cyclin A). FEN1 activity is significant for maintaining the integrity of repeat sequences in genome. Recent data suppose the correlation between the abnormality of hFEN1 activity and arising/progression of neurodegenerative and cancer diseases. FEN1 has the dramatic effect on cell growth and development thereby attracting the interest to this enzyme.

Publication types

  • English Abstract
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • DNA / genetics
  • DNA / metabolism*
  • DNA Repair / genetics
  • DNA Replication / genetics
  • Flap Endonucleases / genetics
  • Flap Endonucleases / metabolism*
  • Genomic Instability / genetics
  • Humans
  • Neoplasms / enzymology
  • Neoplasms / genetics
  • Neurodegenerative Diseases / enzymology
  • Neurodegenerative Diseases / genetics
  • Nuclear Proteins / genetics
  • Nuclear Proteins / metabolism
  • Phosphodiesterase I / genetics
  • Phosphodiesterase I / metabolism*
  • Protein Binding / genetics
  • Recombination, Genetic / genetics
  • Substrate Specificity / genetics


  • Nuclear Proteins
  • Okazaki fragments
  • DNA
  • Flap Endonucleases
  • FEN1 protein, human
  • Phosphodiesterase I