Ethoxzolamide - CAS 452-35-7
Catalog number:
Not Intended for Therapeutic Use. For research use only.
Molecular Formula:
Molecular Weight:
Ethoxzolamide is used in the treatment of glaucoma, and is also used as a diuretic, acting as a carbonic anhydrase inhibitor.
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White to yellow powder
Soluble in DMSO
Store at -20 °C
Acting as a carbonic anhydrase inhibitor.
Quality Standard:
Enterprise standard
Shelf Life:
As supplied, 2 years from the QC date provided on the Certificate of Analysis, when stored properly.
Canonical SMILES:
1.Comparison of the sulfonamide inhibition profiles of the α-, β- and γ-carbonic anhydrases from the pathogenic bacterium Vibrio cholerae.
Del Prete S1, Vullo D2, De Luca V3, Carginale V3, Osman SM4, AlOthman Z4, Supuran CT5, Capasso C6. Bioorg Med Chem Lett. 2016 Apr 15;26(8):1941-6. doi: 10.1016/j.bmcl.2016.03.014. Epub 2016 Mar 7.
Carbonic anhydrases (CA, EC are ubiquitous metalloenzymes, which catalyze the conversion of carbon dioxide (CO2) to bicarbonate (HCO3(-)) and protons (H(+)). In prokaryotes, the existence of genes encoding for α-, β- and γ-classes suggests that these enzymes play an important role in the prokaryotic physiology. It has been demonstrated, in fact, that their inhibition in vivo leads to growth impairment or growth defects of the microorganism. Ultimately, we started to investigate the biochemical properties and the inhibitory profiles of the α- and β-CAs identified in the genome of Vibrio cholerae, which is the causative agent of cholera. The genome of this pathogen encodes for CAs belonging to α, β and γ classes. Here, we report a sulfonamide inhibition study of the γ-CA (named VchCAγ) comparing it with data obtained for the α- and β-CA enzymes. VchCAγ activity (kcat=7.39×10(5)s(-1)) was significantly higher than the other γ-CAs. The inhibition study with a panel of sulfonamides and one sulfamate led to the detection of a large number of nanomolar VchCAγ inhibitors, including simple aromatic/heterocyclic sulfonamides (compounds 2-9, 11, 13-15, 24) as well as EZA, DZA, BRZ, BZA, TPM, ZNS, SLP, IND (KIs in the range of 66.
2.Sulfonamide inhibition studies of the β-carbonic anhydrase from the pathogenic bacterium Vibrio cholerae.
Del Prete S1, Vullo D2, De Luca V3, Carginale V3, Ferraroni M2, Osman SM4, AlOthman Z4, Supuran CT5, Capasso C6. Bioorg Med Chem. 2016 Mar 1;24(5):1115-20. doi: 10.1016/j.bmc.2016.01.037. Epub 2016 Jan 22.
The genome of the pathogenic bacterium Vibrio cholerae encodes for three carbonic anhydrases (CAs, EC belonging to the α-, β- and γ-classes. VchCA, the α-CA from this species was investigated earlier, whereas the β-class enzyme, VchCAβ was recently cloned, characterized kinetically and its X-ray crystal structure reported by this group. Here we report an inhibition study with sulfonamides and one sulfamate of this enzyme. The best VchCAβ inhibitors were deacetylated acetazolamide and methazolamide and hydrochlorothiazide, which showed inhibition constants of 68.2-87.0nM. Other compounds, with medium potency against VchCAβ, (KIs in the range of 275-463nM), were sulfanilamide, metanilamide, sulthiame and saccharin whereas the clinically used agents such as acetazolamide, methazolamide, ethoxzolamide, dorzolamide, zonisamide and celecoxib were micromolar inhibitors (KIs in the range of 4.51-8.57μM). Identification of potent and possibly selective inhibitors of VchCA and VchCAβ over the human CA isoforms, may lead to pharmacological tools useful for understanding the physiological role(s) of this under-investigated enzymes.
3.Sulfonamide inhibition studies of the α-carbonic anhydrase from the gammaproteobacterium Thiomicrospira crunogena XCL-2, TcruCA.
Vullo D1, Bhatt A2, Mahon BP2, McKenna R2, Supuran CT3. Bioorg Med Chem Lett. 2016 Jan 15;26(2):401-5. doi: 10.1016/j.bmcl.2015.11.104. Epub 2015 Dec 1.
We report a sulfonamide/sulfamate inhibition study of the α-carbonic anhydrase (CA, EC present in the gammaproteobacterium Thiomicrospira crunogena XCL-2, a mesophilic hydrothermal vent-isolate organism, TcruCA. As Thiomicrospira crunogena is one of thousands of marine organisms that uses CA for metabolic regulation, the effect of sulfonamide inhibition has been considered. Sulfonamide-based drugs have been widely used in a variety of antibiotics, and bioelimination of these compounds results in exposure of these compounds to marine life. The enzyme was highly inhibited, with Ki values ranging from 2.5 to 40.7nM by a variety of sulfonamides including acetazolamide, methazolamide, ethoxzolamide, dichlorophenamide, dorzolamide, brinzolamide, benzolamide and benzenesulfonamides incorporating 4-hydroxyalkyl moieties. Less effective inhibitors were topiramate, zonisamide, celecoxib, saccharin and hydrochlorothiazide as well as simple benzenesulfonamides incorporating amino, halogeno, alkyl, aminoalkyl and other moieties in the ortho- or para-positions of the aromatic ring (Kis of 202-933nM).
4.Intrinsic thermodynamics of trifluoromethanesulfonamide and ethoxzolamide binding to human carbonic anhydrase VII.
Pilipuitytė V1, Matulis D. J Mol Recognit. 2015 Mar;28(3):166-72. doi: 10.1002/jmr.2404. Epub 2015 Feb 3.
Human carbonic anhydrase (CA) isozyme VII is a cytosolic protein that is highly expressed in the cortex, hippocampus, and thalamus regions within mammalian brain, and expression disorders can cause epilepsy and several cases of malignant brain tumors. Therefore, CA VII is a potential antiepileptic and anticancer drug target. There are numerous sulfonamides that target CAs nonspecifically. It is important to understand the thermodynamics of inhibitor binding and the structural features of the protein-inhibitor complex in order to design specific inhibitors against CA VII. Isothermal titration calorimetry and fluorescent thermal shift assay were used to characterize the intrinsic thermodynamic parameters of trifluoromethanesulfonamide and ethoxzolamide binding to CA VII. Binding experiments were carried out at various pH in different buffers in order to dissect linked protonation of the water molecule bound to the CA VII active site, deprotonation of the sulfonamide group of the inhibitor, and protonation-deprotonation of buffer.
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CAS 452-35-7 Ethoxzolamide

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