Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 61.25 kDa 
• Atom Count: 4679 
• Residue Count: 534 
• Unique protein chains: 1

1KTQ

DNA POLYMERASE

• DOI: 10.2210/pdb1KTQ/pdb

• Classification: NUCLEOTIDYLTRANSFERASE
• Organism(s): Thermus aquaticus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1995-08-16 Released: 1996-11-08 
• Deposition Author(s): Korolev, S., Waksman, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.262 
• R-Value Work: 0.198 
• R-Value Observed: 0.198 

Literature

Crystal structure of the large fragment of Thermus aquaticus DNA polymerase I at 2.5-A resolution: structural basis for thermostability.

Korolev, S., Nayal, M., Barnes, W.M., Di Cera, E., Waksman, G.

(1995) Proc Natl Acad Sci U S A 92: 9264-9268

• PubMed: 7568114 
• DOI: 10.1073/pnas.92.20.9264
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The crystal structure of the large fragment of the Thermus aquaticus DNA polymerase (Klentaq1), determined at 2.5-A resolution, demonstrates a compact two-domain architecture. The C-terminal domain is identical in fold to the equivalent region of the Klenow fragment of Escherichia coli DNA polymerase I (Klenow pol I). Although the N-terminal domain of Klentaq1 differs greatly in sequence from its counterpart in Klenow pol I, it has clearly evolved from a common ancestor. The structure of Klentaq1 reveals the strategy utilized by this protein to maintain activity at high temperatures and provides the structural basis for future improvements of the enzyme.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
DNA POLYMERASE I	A	543	Thermus aquaticus	Mutation(s): 0  Gene Names: polA, pol1 EC: 2.7.7.7
Find proteins for P19821 (Thermus aquaticus) Go to UniProtKB:  P19821

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.262 
• R-Value Work: 0.198 
• R-Value Observed: 0.198 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 109.4	α = 90
b = 136.8	β = 90
c = 45.6	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
R-AXIS	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-08-16 
• Released Date: 1996-11-08 
Deposition Author(s): Korolev, S., Waksman, G.

Revision History 

• Version 1.0: 1996-11-08
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-03-21
  Changes: Data collection, Other