A class of sulfonamides as carbonic anhydrase I and II inhibitors

J Enzyme Inhib Med Chem. 2016;31(sup2):180-188. doi: 10.1080/14756366.2016.1198900. Epub 2016 Jun 29.


Four groups of novel sulfonamide derivatives: (i) acetoxybenzamide, (ii) triacetoxybenzamide, (iii) hydroxybenzamide and (iv) trihydroxybenzamide, all having thiazole, pyrimidine, pyridine, isoxazole and thiadiazole moieties were prepared and their inhibitory effects were studied on two metalloenzymes, i.e. carbonic anhydrase isozymes (hCA I and II), purified from human erythrocyte cells by Sepharose-4B-l-tyrosine-sulfanilamide affinity chromatography. These enzymes are present in almost all living organisms to catalyse the synthesis of bicarbonate ion (HCO3-) from carbon dioxide and water. The sulfonamide derivatives were found to be active against hCA I and II in the range of 2.62-136.54 and 5.74-210.58 nM, respectively.

Keywords: Enzyme inhibition; gallic acid; p-hydroxybenzoic acid.

MeSH terms

  • Carbonic Anhydrase I / antagonists & inhibitors*
  • Carbonic Anhydrase I / metabolism
  • Carbonic Anhydrase II / antagonists & inhibitors*
  • Carbonic Anhydrase II / metabolism
  • Carbonic Anhydrase Inhibitors / chemical synthesis
  • Carbonic Anhydrase Inhibitors / chemistry
  • Carbonic Anhydrase Inhibitors / pharmacology*
  • Dose-Response Relationship, Drug
  • Humans
  • Molecular Structure
  • Structure-Activity Relationship
  • Sulfonamides / chemical synthesis
  • Sulfonamides / chemistry
  • Sulfonamides / pharmacology*


  • Carbonic Anhydrase Inhibitors
  • Sulfonamides
  • Carbonic Anhydrase I
  • Carbonic Anhydrase II