The effects of some bromophenols on human carbonic anhydrase isoenzymes

Carbonic anhydrases (CAs, EC 4.2.1.1), which are involved in a variety of physiological and pathological processes, are ubiquitous metalloenzymes mainly catalyzing the reversible hydration of carbon dioxide (CO2) to bicarbonate (HCO3-) and proton (H+). In this study, a dozen of bromophenol derivatives (1-12) were evaluated as metalloenzyme CA (EC 4.2.1.1) inhibitors against the human carbonic anhydrase isoenzymes I and II (hCA I and II). Cytosolic hCA I and II isoenzymes were effectively inhibited by bromophenol derivatives (1-12) with K-is in the low nanomolar range of 1.85 +/- 0.58 to 5.04 +/- 1.46 nM against hCA I and in the range of 2.01 +/- 0.52 to 2.94 +/- 1.31 nM against hCA II, respectively.