1TAU

TAQ POLYMERASE (E.C.2.7.7.7)/DNA/B-OCTYLGLUCOSIDE COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of Taq ploymerase with DNA at the polymerase active site.

Eom, S.H.Wang, J.Steitz, T.A.

(1996) Nature 382: 278-281

  • DOI: 10.1038/382278a0

  • PubMed Abstract: 
  • The DNA polymerase from Thermus aquaticus (Taq polymerase) is homologous to Escherichia coli DNA polymerase I (Pol I) and likewise has domains responsible for DNA polymerase and 5' nuclease activities. The structures to the polymerase domains of Taq ...

    The DNA polymerase from Thermus aquaticus (Taq polymerase) is homologous to Escherichia coli DNA polymerase I (Pol I) and likewise has domains responsible for DNA polymerase and 5' nuclease activities. The structures to the polymerase domains of Taq polymerase and of the Klenow fragment (KF) of Pol I are almost identical, whereas the structure of a vestigial editing 3'-5' exonuclease domain of Taq polymerase that lies between the other two domains is dramatically altered, resulting in the absence of this activity in the thermostable enzyme. The structures have been solved for editing complexes between KF and single-stranded DNA and for duplex DNA with a 3' overhanging single strand, but not for a complex containing duplex DNA at the polymerase active-site. Here we present the co-crystal structure of Taq polymerase with a blunt-ended duplex DNA bound to the polymerase active-site cleft; the DNA neither bends nor goes through the large polymerase cleft, and the structural form of the bound DNA is between the B and A forms. A wide minor groove allows access to protein side chains that hydrogen-bond to the N3 of purines and the O2 of pyrimidines at the blunt-end terminus. Part of the DNA bound to the polymerase site shares a common binding site with DNA bound to the exonuclease site, but they are translated relative to each other by several angstroms along their helix axes.


    Related Citations: 
    • Crystal Structure of Thermus Aquatics DNA Polymerase
      Kim, Y.,Eom, S.H.,Wang, J.,Lee, D.-S.,Suh, S.W.,Steitz, T.A.
      (1995) Nature 376: 612
    • Isolation, Characterization, and Expression in Escherichia Coli of the DNA Polymerase Gene From Thermus Aquaticus
      Lawyer, F.C.,Stoffel, S.,Saiki, R.K.,Myambo, K.,Drummond, R.,Gelfand, D.H.
      (1989) J.Biol.Chem. 264: 6427


    Organizational Affiliation

    Department of Molecular Biophysics, Yale University, New Haven, Connecticut 06520-811, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (TAQ POLYMERASE)
A
832Thermus aquaticusGene Names: polA (pol1)
EC: 2.7.7.7
Find proteins for P19821 (Thermus aquaticus)
Go to UniProtKB:  P19821
Entity ID: 1
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*CP*GP*AP*TP*CP*CP*G)-3')T8N/A
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*GP*GP*AP*TP*CP*GP*C)-3')P8N/A
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGL
Query on BGL

Download SDF File 
Download CCD File 
A
B-2-OCTYLGLUCOSIDE
C14 H28 O6
BVHPDIWLWHHJPD-RKQHYHRCSA-N
 Ligand Interaction
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.244 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 107.600α = 90.00
b = 107.600β = 90.00
c = 170.010γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
X-PLORrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-04-18
    Type: Initial release
  • Version 1.1: 2008-05-22
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-03-01
    Type: Database references