InterPro domain: IPR020045

General Information

  • Identifier IPR020045
  • Description DNA polymerase I-like, H3TH domain
  • Number of genes 216
  • Gene duplication stats Loading...
  • Associated GO terms GO:0003677   GO:0003824  

Abstract

This entry represents the H3TH (helix-3-turn-helix) domain of the 5'-3' exonuclease (53EXO) of mutli-domain DNA polymerase I and single domain protein homologues. Taq (Thermus aquaticus) DNA polymerase I contains a polymerase domain for synthesizing a new DNA strand and a 53EXO domain for cleaving RNA primers or damaged DNA strands [ 1 , 2 ]. Taq's 53EXO recognizes and endonucleolytically cleaves a structure-specific DNA substrate that has a bifurcated downstream duplex and an upstream template-primer duplex that overlaps the downstream duplex by 1 bp [ 3 ].


1. Improvement of the 3'-5' exonuclease activity of Taq DNA polymerase by protein engineering in the active site. Mol. Cells 7, 419-24
2. Structure of Taq polymerase with DNA at the polymerase active site. Nature 382, 278-81
3. Structure-specific DNA-induced conformational changes in Taq polymerase revealed by small angle neutron scattering. J. Biol. Chem. 279, 39146-54

Species distribution

Gene table

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