Biomaterial Database

Interaction of human AP endonuclease 1 with flap endonuclease 1 and proliferating cell nuclear antigen involved in long-patch base excision repair. 2001

I I Dianova, and V A Bohr, and G L Dianov

MRC Radiation and Genome Stability Unit, Harwell, Oxfordshire OX11 0RD, UK.

To understand the mechanism involved in the coordination of the sequential repair reactions that lead to long-patch BER, we have investigated interactions between proteins involved in this pathway. We find that human AP endonuclease 1 (APE1) physically interacts with flap endonuclease 1 (FEN1) and with proliferating cell nuclear antigen. An oligonucleotide substrate containing a reduced abasic site, which was pre-incised with APE1, was employed to reconstitute the excision step of long-patch BER with purified human DNA polymerase beta and FEN1. We demonstrate that addition of APE1 to the excision reaction mixture slightly (1.5-2-fold) stimulates the removal of the displaced flap by FEN1. These results suggest the possibility that long-patch BER is coordinated and directed by protein-protein interactions.

UI	MeSH Term	Description	Entries
D011233	Precipitin Tests	Serologic tests in which a positive reaction manifested by visible CHEMICAL PRECIPITATION occurs when a soluble ANTIGEN reacts with its precipitins, i.e., ANTIBODIES that can form a precipitate.	Precipitin Test,Test, Precipitin,Tests, Precipitin
D002478	Cells, Cultured	Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.	Cultured Cells,Cell, Cultured,Cultured Cell
D004260	DNA Repair	The removal of DNA LESIONS and/or restoration of intact DNA strands without BASE PAIR MISMATCHES, intrastrand or interstrand crosslinks, or discontinuities in the DNA sugar-phosphate backbones.	DNA Damage Response
D004261	DNA Replication	The process by which a DNA molecule is duplicated.	Autonomous Replication,Replication, Autonomous,Autonomous Replications,DNA Replications,Replication, DNA,Replications, Autonomous,Replications, DNA
D004706	Endodeoxyribonucleases	A group of enzymes catalyzing the endonucleolytic cleavage of DNA. They include members of EC 3.1.21.-, EC 3.1.22.-, EC 3.1.23.- (DNA RESTRICTION ENZYMES), EC 3.1.24.- (DNA RESTRICTION ENZYMES), and EC 3.1.25.-.
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D043223	Deoxyribonuclease IV (Phage T4-Induced)	An enzyme which catalyzes the endonucleolytic cleavage of phosphodiester bonds at purinic or apyrimidinic sites (AP-sites) to produce 5'-Phosphooligonucleotide end products. The enzyme prefers single-stranded DNA (ssDNA) and was formerly classified as EC 3.1.4.30.	Deoxyriboendonuclease IV,Endonuclease IV,Redoxyendonuclease
D043603	DNA-(Apurinic or Apyrimidinic Site) Lyase	A DNA repair enzyme that catalyses the excision of ribose residues at apurinic and apyrimidinic DNA sites that can result from the action of DNA GLYCOSYLASES. The enzyme catalyzes a beta-elimination reaction in which the C-O-P bond 3' to the apurinic or apyrimidinic site in DNA is broken, leaving a 3'-terminal unsaturated sugar and a product with a terminal 5'-phosphate. This enzyme was previously listed under EC 3.1.25.2.	Apurinic DNA Endonuclease,DNA Lyase (Apurinic or Apyrimidinic),Endodeoxyribonuclease (Apurinic or Apyrimidinic),AP Endonuclease,AP Lyase,Apurine-Apyrimidine Endonuclease,Apurinic Endonuclease,Apurine Apyrimidine Endonuclease,DNA Endonuclease, Apurinic,Endonuclease, AP,Endonuclease, Apurine-Apyrimidine,Endonuclease, Apurinic,Endonuclease, Apurinic DNA
D045585	Flap Endonucleases	Endonucleases that remove 5' DNA sequences from a DNA structure called a DNA flap. The DNA flap structure occurs in double-stranded DNA containing a single-stranded break where the 5' portion of the downstream strand is too long and overlaps the 3' end of the upstream strand. Flap endonucleases cleave the downstream strand of the overlap flap structure precisely after the first base-paired nucleotide, creating a ligatable nick.	Flap Endonuclease,FEN-1,Fen1 Protein,Flap Endonuclease-1,RAD2 Homolog-1 Nuclease,RTH-1 Nuclease,Endonuclease, Flap,Endonuclease-1, Flap,Endonucleases, Flap,Flap Endonuclease 1,Nuclease, RTH-1,RAD2 Homolog 1 Nuclease,RTH 1 Nuclease
D018809	Proliferating Cell Nuclear Antigen	Nuclear antigen with a role in DNA synthesis, DNA repair, and cell cycle progression. PCNA is required for the coordinated synthesis of both leading and lagging strands at the replication fork during DNA replication. PCNA expression correlates with the proliferation activity of several malignant and non-malignant cell types.	Antigen, Proliferating Cell Nuclear,PCNA