The δ-carbonic anhydrase (CA, EC 4.2.1.1) TweCA from the marine diatom Thalassiosira weissflogii has recently been cloned, purified and its activity/inhibition with anions investigated. Here we report the first sulfonamide/sulfamate inhibition study of a δ-class CA. Among the 40 such compounds investigated so far, 3-bromosulfanilamide, acetazolamide, ethoxzolamide, dorzolamide and brinzolamide were the most effective TweCA inhibitors detected, with KIs of 49.6-118nM. Many simple aromatic sulfonamides as well as dichlorophenamide, benzolamide, topiramate, zonisamide, indisulam and valdecoxib were medium potency inhibitors, (KIs of 375-897nM). Saccharin and hydrochlorothiazide were ineffective inhibitors of the δ-class enzyme, with KIs of 4.27-9.20μM. The inhibition profile of the δ-CA is very different from that of α-, β- and γ-CAs from different organisms. Although no X-ray crystal structure of this enzyme is available, we hypothesize that as for other CA classes, the sulfonamides inhibit the enzymatic activity by binding to the Zn(II) ion from the δ-CA active site.
Sulfonamide inhibition studies of the δ-carbonic anhydrase from the diatom Thalassiosira weissflogii / D. Vullo;S. D. Prete;S. M. Osman;V. D. Luca;A. Scozzafava;Z. Alothman;C. T. Supuran;C. Capasso. - In: BIOORGANIC & MEDICINAL CHEMISTRY LETTERS. - ISSN 0960-894X. - STAMPA. - 24:(2014), pp. 275-279. [10.1016/j.bmcl.2013.11.021]
Sulfonamide inhibition studies of the δ-carbonic anhydrase from the diatom Thalassiosira weissflogii.
VULLO, DANIELA;SCOZZAFAVA, ANDREA;SUPURAN, CLAUDIU TRANDAFIR;
2014
Abstract
The δ-carbonic anhydrase (CA, EC 4.2.1.1) TweCA from the marine diatom Thalassiosira weissflogii has recently been cloned, purified and its activity/inhibition with anions investigated. Here we report the first sulfonamide/sulfamate inhibition study of a δ-class CA. Among the 40 such compounds investigated so far, 3-bromosulfanilamide, acetazolamide, ethoxzolamide, dorzolamide and brinzolamide were the most effective TweCA inhibitors detected, with KIs of 49.6-118nM. Many simple aromatic sulfonamides as well as dichlorophenamide, benzolamide, topiramate, zonisamide, indisulam and valdecoxib were medium potency inhibitors, (KIs of 375-897nM). Saccharin and hydrochlorothiazide were ineffective inhibitors of the δ-class enzyme, with KIs of 4.27-9.20μM. The inhibition profile of the δ-CA is very different from that of α-, β- and γ-CAs from different organisms. Although no X-ray crystal structure of this enzyme is available, we hypothesize that as for other CA classes, the sulfonamides inhibit the enzymatic activity by binding to the Zn(II) ion from the δ-CA active site.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.