Molecular Cloning, Characterization, and Inhibition Studies of the Rv1284 β-Carbonic Anhydrase from Mycobacterium tuberculosis with Sulfonamides and a Sulfamate

被引:79
作者
Minakuchi, Tomoko [2 ]
Nishimori, Isao [2 ]
Vullo, Daniela [1 ]
Scozzafava, Andrea [1 ]
Supuran, Claudiu T. [1 ]
机构
[1] Univ Florence, Lab Chim Bioinorgan, I-50019 Florence, Italy
[2] Kochi Med Sch, Dept Gastroenterol, Kochi 7838505, Japan
关键词
YEAST SACCHAROMYCES-CEREVISIAE; PH-DEPENDENT ACTIVITY; HELICOBACTER-PYLORI; CRYSTAL-STRUCTURE; X-RAY; METHANOBACTERIUM-THERMOAUTOTROPHICUM; CRYPTOCOCCUS-NEOFORMANS; ANTITUMOR SULFONAMIDE; CLASS ENZYME; ISOZYME-II;
D O I
10.1021/jm9000488
中图分类号
R914 [药物化学];
学科分类号
100701 ;
摘要
The beta-carbonic anhydrase (CA, EC 4.2. 1.1) encoded by the gene Rv 1284 (mtCA 1) of Mycobacterium tuberculosis shows appreciable catalytic activity for CO, hydration, with a k(cat) of 3.9 x 10(5) s(-1) and a k(cat)/K-m of 3.7 x 10(7) M-1 s(-1). A panel of 36 sulfonamides and one sulfamate, some of which are used clinically, were assayed for their effect on mtCA 1 catalytic activity. Most sulfonamides exhibited K-1 values in the range of 1-10 mu M, but several derivatives, including sulfanilyl-sulfonamides acetazolamide, methazolamide, dichlorophenamide, dorzolamide, brinzolamide, benzolamide, and the sulfamate topiramate, exhibited submicromolar inhibition (K-I values of 0.481-0.905 mu M). The best inhibitors were 3-bromosulfanilamide and indisulam (K-1 values of 97-186 nM). This study demonstrates that mtCA 1 can be inhibited by sulfonarnides and sulfamates and thus has potential for developing antimycobacterial agents with an alternate mechanism of action. This is an important finding to explore further, as many strains exhibit multidrug resistance and extensive multidrug resistance to existing therapeutics.
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页码:2226 / 2232
页数:7
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