Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 30327.88 
• Atom Count: 2098 
• Residue Count: 262 
• Unique protein chains: 1

4XE1

Human carbonic anhydrase II in complex with 6-SULFAMOYL-SACCHARIN

• DOI: 10.2210/pdb4XE1/pdb

• Classification: LYASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2014-12-21 Released: 2015-03-18 
• Deposition Author(s): Alterio, V., De Simone, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.214 
• R-Value Work: 0.168 

Literature

X-ray crystallographic and kinetic investigations of 6-sulfamoyl-saccharin as a carbonic anhydrase inhibitor.

Alterio, V., Tanc, M., Ivanova, J., Zalubovskis, R., Vozny, I., Monti, S.M., Di Fiore, A., De Simone, G., Supuran, C.T.

(2015) Org.Biomol.Chem. 13: 4064-4069

• PubMed: 25733161 
• DOI: 10.1039/c4ob02648a


• PubMed Abstract: 
  

6-Sulfamoyl-saccharin was investigated as an inhibitor of 11 α-carbonic anhydrase (CA, EC 4.2.1.1) isoforms of human (h) origin, hCA I-XIV, and X-ray crystallographic data were obtained for its adduct with hCA II, the physiologically dominant isoform. This compound possesses two potential zinc-binding groups, the primary sulfamoyl one and the secondary, acylatedsulfonamide. Saccharin itself binds to the Zn(II) ion from the CA active site coordinating with this last group, in deprotonated (SO2N(-)CO) form. Here we explain why 6-sulfamoyl-saccharin, unlike saccharin, binds to the metal ion from the hCA II active site by its primary sulfonamide moiety and not the secondary one as saccharin itself. Our study is useful for shedding new light to the structure-based drug design of isoform-selective CA inhibitors of the sulfonamide type.

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Organizational Affiliation: 

Istituto di Biostrutture e Bioimmagini-CNR, via Mezzocannone 16, 80134 Naples, Italy.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Carbonic anhydrase 2	A	262	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 4 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
IL5	A	3-oxo-2,3-dihydro-1,2-benzothiazole-6-sulfonamide 1,1-dioxide C7 H6 N2 O5 S2 CRSHTYPFKXPVRE-UHFFFAOYSA-N
HGB	A	4-(HYDROXYMERCURY)BENZOIC ACID C7 H6 Hg O3 WMHRYLDWLOGHSG-UHFFFAOYSA-M

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
IL5	Ki: 77.3 nM BINDINGMOAD

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.214 
• R-Value Work: 0.168 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 42.212	α = 90.00
b = 41.680	β = 104.33
c = 71.731	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data reduction
PDB_EXTRACT	data extraction
O	model building
CNS	refinement
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-12-21 
• Released Date: 2015-03-18 
• Deposition Author(s): Alterio, V., De Simone, G.

Revision History 

• Version 1.0: 2015-03-18
  Type: Initial release
• Version 1.1: 2015-03-25
  Type: Database references