Sulfamates of methyl triterpenoates are effective and competitive inhibitors of carbonic anhydrase II
作者:Stefan Schwarz、Sven Sommerwerk、Susana D. Lucas、Lucie Heller、René Csuk
DOI:10.1016/j.ejmech.2014.08.051
日期:2014.10
Carbonic anhydrase II, belonging to one of the most important enzyme groups of the human body, is a well-studied isozyme from the family of the carbonic anhydrases. Since it is involved in several physiological processes, it has been a pharmaceutical target for many years. In this study we synthesized a number of sulfamates derived from pentacyclic methyl triterpenoates, and we demonstrate their potential as carbonic anhydrase II inhibitors using the well-established photometric 4-nitrophenyl acetate assay. Inhibition constants, as an indicator of their inhibition strength, were in the micromolar range; one compound (10, methyl (3 beta) 3-(aminosulfonyloxy)-oleanoate) showed a K-i value as low as 0.3 mu M. This K-i value is comparable to that of acetazolamide which is a potent carbonic anhydrase inhibitor and a drug for the treatment of glaucoma. (C) 2014 Elsevier Masson SAS. All rights reserved.
Ursolic and oleanolic acid derivatives with cholinesterase inhibiting potential
作者:Anne Loesche、Alexander Köwitsch、Susana D. Lucas、Zayan Al-Halabi、Wolfgang Sippl、Ahmed Al-Harrasi、René Csuk
DOI:10.1016/j.bioorg.2018.12.013
日期:2019.4
for each of the active compounds the type of inhibition was determined. As a result, several compounds were shown as good inhibitors for acetylcholinesterase and butyrylcholinesterase even in a micromolar range. An ursolic acid derived hydroxyl-propinyl derivative 10 was a competitive inhibitor for butyrylcholinesterase with an inhibition constant of Ki = 4.29 μM, and therefore being twice as active