4CQ0

Cyclic secondary sulfonamides: unusually good inhibitors of cancer- related carbonic anhydrase enzymes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Cyclic Secondary Sulfonamides: Unusually Good Inhibitors of Cancer-Related Carbonic Anhydrase Enzymes.

Moeker, J.Peat, T.S.Bornaghi, L.F.Vullo, D.Supuran, C.T.Poulsen, S.

(2014) J.Med.Chem. 57: 3522

  • DOI: 10.1021/jm500255y

  • PubMed Abstract: 
  • Carbonic anhydrase IX (CA IX) is a target for hypoxic cancer therapies, and the discovery of CA IX selective ligands is imperative for the development of these agents. Primary sulfonamides are broad specificity inhibitors of CA enzymes, while seconda ...

    Carbonic anhydrase IX (CA IX) is a target for hypoxic cancer therapies, and the discovery of CA IX selective ligands is imperative for the development of these agents. Primary sulfonamides are broad specificity inhibitors of CA enzymes, while secondary sulfonamides are generally poor CA inhibitors. However, saccharin, a cyclic secondary sulfonamide, has unusually good inhibition of CA IX (Ki = 103 nM). In this study, we demonstrate that the affinity and selectivity of saccharin for CA IX can be further modulated when linked to hydrophobic or hydrophilic substituents. The hydrophilic glycoconjugate derivative (12) showed improved inhibition of CA IX (Ki = 49.5 nM) and extremely poor inhibition of the predominant off-target CAs (Ki > 50000 nM) compared to saccharin. This >1000-fold selectivity for CA IX over off-target CAs is unprecedented for classical primary sulfonamide CA inhibitors. Our study highlights the potential of cyclic secondary sulfonamides to be exploited for the discovery of potent, cancer-selective CA inhibitors.


    Organizational Affiliation

    Eskitis Institute for Drug Discovery, Griffith University , Nathan, Queensland 4111, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CARBONIC ANHYDRASE 2
A
260Homo sapiensMutation(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 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
FMT
Query on FMT

Download SDF File 
Download CCD File 
A
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
SXS
Query on SXS

Download SDF File 
Download CCD File 
A
6-amino-1,2-benzothiazol-3(2H)-one 1,1-dioxide
C7 H6 N2 O3 S
SSRKZHLPNHLAKM-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SXSIC50: 49000 nM (100) BINDINGDB
SXSKi: >50000 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.157 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 42.183α = 90.00
b = 41.210β = 104.64
c = 71.919γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALAdata scaling
REFMACrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-16
    Type: Initial release
  • Version 1.1: 2014-05-07
    Type: Database references
  • Version 1.2: 2019-05-15
    Type: Data collection, Experimental preparation, Other