Home Tools & Resources Selection Charts Properties of DNA Repair Enzymes and Structure-specific Endonucleases

Properties of DNA Repair Enzymes and Structure-specific Endonucleases

NEB carries an array of reliable DNA repair enzymes for use in multiple applications.

Enzyme Major Substrate1,2 Cleave site Product(s) Produced Termini Created from Cleavage Major Activity Thermostable
        5′ 3′    
APE 1  AP site 1st phosphodiester bond 5′ to AP site 1nt gap dR5P  OH              Endonuclease  
Endo III  AP site, damaged pyrimidines, Tg N-glycosidic bond; 1st phosphodiester bond 3′ to AP site 1nt gap P PA Glycosylase & AP lyase  
Tma Endo III  AP site, damaged pyrimidines, Tg N-glycosidic bond; 1st phosphodiester bond 3′ to AP site  1nt gap P PA Glycosylase & AP lyase YES
Endo IV  AP site 1st phosphodiester bond 5′ to AP site 1nt gap dR5P  OH              Endonuclease  
Tth Endo IV  AP site 1st phosphodiester bond 5′ to AP site  1nt gap dR5P  OH              Endonuclease YES
Endo V  dI4, dU, AP site 2nd phosphodiester bond 3′ to dI nick P              OH              Endonuclease  
Endo VIII  AP site4 phosphodiester bond 3′ & 5′ to AP site 1nt gap P P AP lyase  
Fpg  8oxoG, oxidized purines N-glycosidic bond; phosphodiester bond 3′ & 5′ to AP site AP site; 1nt gap P P Glycosylase & AP lyase  
hAAG  3mA, 7mG, dI, dX  N-glycosidic bond AP site N/A N/A Glycosylase  
hSMUG1  dU4, 5-hmU, 5-hoU, 5-fU N-glycosidic bond AP site N/A N/A Glycosylase  
Mismatch Endonuclease I
 T:T, G:G and G:T Mismatches in dsDNA
 3rd phosphodiester bond on the 5′ side of the mismatched base in both strands 
 5 bp overhang P  OH Endonuclease
  
RNaseHII              rN in dsDNA phosphodiester bond 5′ to ribo nick P              OH  Endonuclease  
T4 PDG  CPD, AP site N-glycosidic bond; phosphodiester bond 3′ to AP site AP site; 1nt gap P6 
Glycosylase & AP lyase               
UDG  dU4 N-glycosidic bond AP site N/A N/A Glycosylase  
Afu UDG  dU4 N-glycosidic bond AP site N/A N/A Glycosylase YES
Antarctic Thermolabile UDG  dU4           N-glycosidic bond
 AP site
 N/A
 N/A
 Glycosylase  
T7 Endo I  crucifroms, mismatches, Holliday junctions, across DNA nicks phosphodiester bond 5′ to structure nick P              OH  Endonuclease  
Thermostable FEN1  5′ DNA flap3 phosphodiester bond at base of flap nick P              OH (on flap)  Endonuclease YES

 
Table Legend:
3mA 3-methyladenine
5-fU 5-formyluridine
5-hmU 5-hydroxymethyluridine
5-hoU 5-hydroxyuridine
7mG 7-methylguanine
8oxoG 8-oxo-7,8-dihydroguanine
AP apurinic/apyrimidinic sites
CPDs Cyclobutane pyrimidine dimers
dI deoxyinosine
dR5P deoxyribose 5′-phosphate
dU deoxyuridine
dX deoxyxanthosine
NA Not applicable
OH Hydroxyl
P Phosphate
PA 3′-phospho-α, β-unsaturated aldehyde
rN ribonucleotides
Tg Thymine Glycol

Footnotes

  1. activity is on dsDNA unless noted otherwise
  2. Minor activies, substrates, and references can be found at www.neb.com
  3. 5′ flaps of 1 - 40 nt in length have been confirmed substrates
  4. enzyme has robust activity on ssDNA in addition to dsDNA
  5. Antarctic Thermolabile UDG can be heat inactivated
  6. CPD still covalently attached