1EOU

CRYSTAL STRUCTURE OF HUMAN CARBONIC ANHYDRASE II COMPLEXED WITH AN ANTICONVULSANT SUGAR SULFAMATE

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 

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This is version 1.3 of the entry. See complete history. 


Literature

Crystal structure of human carbonic anhydrase II complexed with an anti-convulsant sugar sulphamate.

Recacha, R., Costanzo, M.J., Maryanoff, B.E., Chattopadhyay, D.

(2002) Biochem J 361: 437-441

  • DOI: 10.1042/0264-6021:3610437
  • Primary Citation of Related Structures:  
    1EOU

  • PubMed Abstract: 

    • The fructose-based sugar sulphamate RWJ-37497, a potent analogue of the widely used anti-epileptic drug topiramate, possesses anti-convulsant and carbonic anhydrase-inhibitory activities. We have studied the binding interactions of RWJ-37497 in the active site of human carbonic anhydrase II by X-ray crystallography ...

    The fructose-based sugar sulphamate RWJ-37497, a potent analogue of the widely used anti-epileptic drug topiramate, possesses anti-convulsant and carbonic anhydrase-inhibitory activities. We have studied the binding interactions of RWJ-37497 in the active site of human carbonic anhydrase II by X-ray crystallography. The atomic positions of the enzyme inhibitor complex were refined at a resolution of 2.1 A (1 A=0.1 nm) to the final crystallographic R and R(free) values of 0.18 and 0.23, respectively. The inhibitor co-ordinates to the active-site zinc ion through its oxygen atom and the ionized nitrogen atom of the sulphamate group by replacing the metal-bound water molecules, although the sulphamoyl oxygen atom provides a rather lengthy co-ordination. The 4,5-cyclic sulphate group is positioned in a hydrophobic pocket of the active site, making contacts with the residues Phe-131, Leu-198, Pro-201 and Pro-202. Since the ligand was found to be intact, concerns about RWJ-37947 irreversibly alkylating the enzyme through its 4,5-cyclic sulphate group were dispelled.

    Related Citations: 
    • Novel Binding Mode of Hydroxamate Inhibitors to Human Carbonic Anhydrase II
      Scolnick, L.R., Clements, A.M., Christianson, D.W.
      (1997) J Am Chem Soc 119: 850
    • tructure-Activity Studies on Anticonvulsant Sugar Sulfamates Related to Topiramate. Enhanced Potency with Cyclic Sulfate Derivatives
      Maryanoff, B.E., Costanzo, M.J., Nortey, S.O., Greco, M.N., Shank, R.P.
      (1998) J Med Chem 41: 1315
    Organizational Affiliation: 

    Center for Biophysical Sciences and Engineering, and School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CARBONIC ANHYDRASE II (CA II)A260Homo sapiensMutation(s): 0 
Gene Names: CA2
EC: 4.2.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens)
Explore P00918 
Go to UniProtKB:  P00918
PHAROS:  P00918
GTEx:  ENSG00000104267
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SMS (Subject of Investigation/LOI)
Query on SMS
Download Ideal Coordinates CCD File 
C [auth A]SULFAMIC ACID 2,3-O-(1-METHYLETHYLIDENE)-4,5-O-SULFONYL-BETA-FRUCTOPYRANOSE ESTER
C9 H15 N O10 S2
GGOAQSGCBDRTHT-JAKMQLQISA-N		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
SMS BindingDB:  1EOU Ki: min: 12, max: 910 (nM) from 5 assay(s)
Kd: 10 (nM) from 1 assay(s)
IC50: 36 (nM) from 1 assay(s)
PDBBind:  1EOU IC50: 36 (nM) from 1 assay(s)
Binding MOAD:  1EOU IC50: 36 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.275α = 90
b = 41.39β = 104.11
c = 72.509γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-02-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-03-07
    Changes: Data collection