1CKQ

PRE-TRANSITION STATE ECO RI ENDONUCLEASE/COGNATE DNA (TCGCGAATTCGCG) COMPLEX

• PDB DOI: https://doi.org/10.2210/pdb1CKQ/pdb
• NAKB: 1CKQ

• Classification: PROTEIN/DNA
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 1999-04-22 Released: 1999-04-26 
• Deposition Author(s): Horvath, M., Rosenberg, J.M.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.286 
• R-Value Work: 0.235 
• R-Value Observed: 0.235 

Literature

The Integration of Recognition and Cleavage: X-Ray Structures of Pre- Transition State and Post-Reactive DNA-Eco Ri Endonuclease Complexes

Horvath, M., Choi, J., Kim, Y., Wilkosz, P.A., Chandrasekhar, K., Rosenberg, J.M.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 34.94 kDa 
• Atom Count: 2,465 
• Modelled Residue Count: 274 
• Deposited Residue Count: 289 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

Macromolecules

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (ENDONUCLEASE)	B [auth A]	276	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P00642 (Escherichia coli) Explore P00642  Go to UniProtKB:  P00642

Entity ID: 1
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*TP*CP*GP*CP*GP*AP*AP*TP*TP*CP*GP*CP*G)-3')	A [auth B]	13	N/A

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.286 
• R-Value Work: 0.235 
• R-Value Observed: 0.235 
• Space Group: P 3 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 118.11	α = 90
b = 118.11	β = 90
c = 49.45	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-04-26 
Deposition Author(s): Horvath, M., Rosenberg, J.M.

Revision History  

• Version 1.0: 1999-04-26
  Type: Initial release
  
• Version 1.1: 2007-10-16
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-09
  Changes: Data collection, Database references, Refinement description