Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 30319.83 
• Atom Count: 2108 
• Residue Count: 260 
• Unique protein chains: 1

2Q38

Carbonic Anhydrase II in complex with Saccharin at 1.95 Angstrom

• DOI: 10.2210/pdb2Q38/pdb

• Classification: LYASE
• Organism(s): Homo sapiens


• Deposited: 2007-05-30 Released: 2007-10-02 
• Deposition Author(s): Schulze Wischeler, J., Heine, A., Klebe, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.260 
• R-Value Work: 0.182 

Literature

Saccharin Inhibits Carbonic Anhydrases: Possible Explanation for its Unpleasant Metallic Aftertaste.

Kohler, K., Hillebrecht, A., Schulze Wischeler, J., Innocenti, A., Heine, A., Supuran, C.T., Klebe, G.

(2007) Angew.Chem.Int.Ed.Engl. 46: 7697-7699

• PubMed: 17705204 
• DOI: 10.1002/anie.200701189
• Primary Citation of Related Structures:  
  2Q1B

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Carbonic anhydrase 2	A	260	Homo sapiens	Mutation(s): 0  Gene Names: CA2 EC: 4.2.1.1
Find proteins for P00918 (Homo sapiens) Go to Gene View: CA2 Go to UniProtKB:  P00918

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
GOL	A	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
BEZ	A	BENZOIC ACID C7 H6 O2 WPYMKLBDIGXBTP-UHFFFAOYSA-N
LSA	A	1,2-BENZISOTHIAZOL-3(2H)-ONE 1,1-DIOXIDE SACCHARIN C7 H5 N O3 S CVHZOJJKTDOEJC-UHFFFAOYSA-N
HG	A	MERCURY (II) ION Hg BQPIGGFYSBELGY-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
LSA	Ki: 5950 - 5950000 nM (100) BINDINGDB
LSA	Ki: 5950 nM BINDINGMOAD
LSA	Ki: 5950 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.260 
• R-Value Work: 0.182 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 42.200	α = 90.00
b = 41.400	β = 104.60
c = 72.200	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data reduction
HKL-2000	data scaling
SHELX	model building
PHASER	phasing
CrystalClear	data collection
SHELXL-97	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-05-30 
• Released Date: 2007-10-02 
• Deposition Author(s): Schulze Wischeler, J., Heine, A., Klebe, G.

Revision History 

• Version 1.0: 2007-10-02
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Non-polymer description, Version format compliance