4ITP

Structure of human carbonic anhydrase II bound to a benzene sulfonamide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.155 

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Ligand Structure Quality Assessment 


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Literature

Structural study of the location of the phenyl tail of benzene sulfonamides and the effect on human carbonic anhydrase inhibition.

Guzel-Akdemir, O.Biswas, S.Lastra, K.McKenna, R.Supuran, C.T.

(2013) Bioorg Med Chem 21: 6674-6680

  • DOI: https://doi.org/10.1016/j.bmc.2013.08.011
  • Primary Citation of Related Structures:  
    4ITP

  • PubMed Abstract: 

    The crystal structure of 4-phenylacetamidomethyl-benzenesulfonamide (4ITP) bound to human carbonic anhydrase (hCA, EC 4.2.1.1) II is reported. 4ITP is a medium potency hCA I and II inhibitor (KIs of 54-75nM), a strong mitochondrial CA VA/VB inhibitor (KIs of 8.3-8.6nM) and a weak transmembrane CA inhibitor (KIs of 136-212nM against hCA IX and XII). This elongated compound binds in an extended conformation to hCA II, with its tail lying towards the hydrophobic half of the active site whereas the sulfonamide moiety coordinates the zinc ion. The present structure was compared to that of structurally related aromatic sulfonamides, such as 4-phenylacetamido-benzene-sulfonamide (3OYS), 4-(2-mercaptophenylacetamido)-benzene-sulfonamide (2HD6) and 4-(3-nitrophenyl)-ureido-benzenesulfonamide (3N2P). Homology models of the hCA I, VA, VB, IX and XII structures were build which afforded an understanding of the amino acids involved in the binding of these compounds to these isoforms. The main conclusion of the study is that the orientation of the tail moiety and the presence of flexible linkers as well polar groups in it, strongly influence the potency and the selectivity of the sulfonamides for the inhibition of cytosolic, mitochondrial or transmembrane CA isoforms.


  • Organizational Affiliation

    Università degli Studi di Firenze, Polo Scientifico, Laboratorio di Chimica Bioinorganica, Rm. 188, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy; Istanbul University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, 34116 Beyazit, Istanbul, Turkey.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carbonic anhydrase 2257Homo sapiensMutation(s): 0 
Gene Names: CA2
EC: 4.2.1.1 (PDB Primary Data), 4.2.1.69 (UniProt)
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
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
1GD
Query on 1GD

Download Ideal Coordinates CCD File 
E [auth A]2-phenyl-N-(4-sulfamoylbenzyl)acetamide
C15 H16 N2 O3 S
FTDLZZRRCJRQAA-UHFFFAOYSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
B [auth A],
D [auth A],
G [auth A],
H [auth A],
I [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
DMS
Query on DMS

Download Ideal Coordinates CCD File 
F [auth A]DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
C [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.155 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.34α = 90
b = 41.274β = 104.16
c = 72.007γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-01
    Type: Initial release
  • Version 1.1: 2024-02-28
    Changes: Data collection, Database references, Derived calculations