The crystal structure of the human carbonic anhydrase II in complex with 4-amino-6-trifluoromethyl-benzene-1,3-disulfonamide

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.184 

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This is version 1.3 of the entry. See complete history


Carbonic anhydrase inhibitors: Inhibition of human, bacterial, and archaeal isozymes with benzene-1,3-disulfonamides-Solution and crystallographic studies.

Alterio, V.De Simone, G.Monti, S.M.Scozzafava, A.Supuran, C.T.

(2007) Bioorg Med Chem Lett 17: 4201-4207

  • DOI: https://doi.org/10.1016/j.bmcl.2007.05.045
  • Primary Citation of Related Structures:  
    2POU, 2POV, 2POW

  • PubMed Abstract: 

    Three benzene-1,3-disulfonamide derivatives were investigated for their interaction with 12 mammalian alpha-carbonic anhydrases (CAs, EC, and three bacterial/archaeal CAs belonging to the alpha-, beta-, and gamma-CA class, respectively. X-ray crystal structure of the three inhibitors in complex with the dominant human isozyme CA II revealed a particular binding mode within the cavity. The sulfonamide group in meta-position to the Zn(2+)-coordinated SO(2)NH(2) moiety was oriented toward the hydrophilic side of the active site cleft, establishing hydrogen bonds with His64, Asn67, Gln92, and Thr200. The plane of the phenyl moiety of the inhibitors was rotated by 45 degrees and tilted by 10 degrees with respect to its most recurrent orientation in other CA II-sulfonamide complexes.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carbonic anhydrase 2260Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens)
Explore P00918 
Go to UniProtKB:  P00918
PHAROS:  P00918
GTEx:  ENSG00000104267 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00918
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on I7C

Download Ideal Coordinates CCD File 
C7 H8 F3 N3 O4 S2
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Binding Affinity Annotations 
IDSourceBinding Affinity
I7C Binding MOAD:  2POW Ki: 63 (nM) from 1 assay(s)
PDBBind:  2POW Ki: 63 (nM) from 1 assay(s)
BindingDB:  2POW Ki: min: 62, max: 6.30e+4 (nM) from 3 assay(s)
IC50: 340 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.98α = 90
b = 41.4β = 104.23
c = 72.03γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-24
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description