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Bioorg Med Chem Lett. 2007 Jul 1;17(13):3585-94. Epub 2007 Apr 25.

Carbonic anhydrase inhibitors: the beta-carbonic anhydrase from Helicobacter pylori is a new target for sulfonamide and sulfamate inhibitors.

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Department of Gastroenterology and Hepatology, Kochi Medical School, Nankoku, Kochi 783-8505, Japan.


DNA clones for the beta-class carbonic anhydrase (CA, EC of Helicobactor pylori (hpbetaCA) were obtained. A recombinant hpbetaCA protein lacking the N-terminal 15-amino acid residues was produced and purified, representing a catalytically efficient CA. hpbetaCA was strongly inhibited (K(I)s in the range of 24-45 nM) by many sulfonamides/sulfamates, among which acetazolamide, ethoxzolamide, topiramate, and sulpiride, all clinically used drugs. The dual inhibition of alpha- and/or beta-class CAs of H. pylori might represent a useful alternative for the management of gastritis/gastric ulcers, as well as gastric cancer. This is also the first study showing that a bacterial beta-CA can be a drug target.

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