1QC9

THE CRYSTALLOGRAPHIC STRUCTURE OF RESTRICTION ENDONUCLEASE ECO RI AT 3.3 A IN THE ABSENSE OF DNA

• PDB DOI:  https://doi.org/10.2210/pdb1QC9/pdb

• Classification: ENDONUCLEASE
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 1999-05-18 Released: 1999-06-10 
• Deposition Author(s): Chandrasekhar, K., Horvath, M.M., Samudzi, C., Choi, J., Rosenberg, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.295 
• R-Value Work: 0.251 

Literature

The 3.3 A Crystallographic Structure of Restriction Endonuclease Eco RI in the Absence of DNA

Chandrasekhar, K., Horvath, M.M., Samudzi, C., Choi, J., Rosenberg, J.M.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 92.91 kDa 
• Atom Count: 5,979 
• Modelled Residue Count: 759 
• Deposited Residue Count: 828 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (ECO RI ENDONUCLEASE)	A, B, C	276	Escherichia coli	Mutation(s): 0  Gene Names: ecoRIR EC: 3.1.21.4
UniProt
Find proteins for P00642 (Escherichia coli) Explore P00642  Go to UniProtKB:  P00642

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.295 
• R-Value Work: 0.251 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 208.68	α = 90
b = 127.35	β = 98.57
c = 49.87	γ = 90

Software Package:

Software Name	Purpose
MERLOT	phasing
X-PLOR	refinement
X-GEN	data reduction
X-GEN	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-06-10 
Deposition Author(s): Chandrasekhar, K., Horvath, M.M., Samudzi, C., Choi, J., Rosenberg, J.M.

Revision History  

• Version 1.0: 1999-06-10
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-02-01
  Changes: Database references, Structure summary
• Version 1.4: 2017-02-08
  Changes: Derived calculations
• Version 1.5: 2017-10-04
  Changes: Refinement description