Anion inhibition studies of a β-carbonic anhydrase from Clostridium perfringens

Daniela Vullo, R. Siva Sai Kumar, Andrea Scozzafava, Clemente Capasso, James G. Ferry, Claudiu T. Supuran

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45 Scopus citations


A β-carbonic anhydrases (CAs, EC was recently cloned, purified and characterized kinetically in the pathogen Clostridium perfringens. We report here the first inhibition study of this enzyme (CpeCA). CpeCA was poorly inhibited by iodide and bromide, and was inhibited with KIs in the range of 1-10 mM by a range of anions such as (thio)cyanate, azide, bicarbonate, nitrate, nitrite, hydrogensulfite, hydrogensulfide, stannate, tellurate, pyrophosphate, divanadate, tetraborate, peroxydisulfate, sulfate, iminodisulfonate and fluorosulfonate. Better inhibitory power, with K Is of 0.36-1.0 mM, was observed for cyanide, carbonate, selenate, selenocyanide, trithiocarbonate and diethyldithiocarbamate, whereas the best CpeCA inhibitors were sulfamate, sulfamide, phenylboronic acid and phenylarsonic acid, which had KIs in the range of 7-75 μM. This study thus provides the basis for developing better clostridial enzyme inhibitors with potential as antiinfectives with a new mechanism of action.

Original languageEnglish (US)
Pages (from-to)6706-6710
Number of pages5
JournalBioorganic and Medicinal Chemistry Letters
Issue number24
StatePublished - Dec 15 2013

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


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