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    Determination of the inhibitory effects of N-methylpyrrole derivatives on glutathione reductase enzyme
    (Taylor & Francis Ltd, 2019) Kocaoğlu, Esma; Talaz, Oktay; Çavdar, Hüseyin; Şentürk, Murat; Supuran, Claudiu T.; Ekinci, Deniz
    Glutathione reductase (GR) is a crucial antioxidant enzyme which is responsible for the maintenance of antioxidant GSH molecule. Antimalarial effects of some chemical molecules are attributed to their inhibition of GR, thus inhibitors of this enzyme are expected to be promising candidates for the treatment of malaria. In this work, GR inhibitory properties of N-Methylpyrrole derivatives are reported. It was found that all compounds have better inhibitory activity than the strong GR inhibitor N,N-bis(2-chloroethyl)-N-nitrosourea, especially three molecules, 8 m, 8 n, and 8 q, were determined to be the most powerful among them. Findings of our study indicates that these Schiff base derivatives are strong GR inhibitors which can be used as leads for designation of novel antimalarial candidates.
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    Structure-activity relationships for the interaction of 5,10-dihydroindeno[1,2-b] indole derivatives with human and bovine carbonic anhydrase isoforms I, II, III, IV and VI
    (Elsevier France - Editions Scientifiques Medicales Elsevier, 2012) Ekinci, Deniz; Çavdar, Hüseyin; Durdağı, Serdar; Talaz, Oktay; Şentürk, Murat; Supuran, Claudiu T.
    Several 5,10-dihydroindeno[1,2-b]indole derivatives incorporating methoxy, hydroxyl, and halogen (F, Cl, and Br) moieties on the indene fragment of the molecule were prepared and tested against five carbonic anhydrase (CA, EC 4.2.1.1) isoforms. The inhibitory potencies of these compounds against the human (h) isoforms hCA I, II, IV, VI and bovine (b) isoform bCA III were assessed. Most of them exhibited low micromolar inhibition of these enzymes. K-I values of these compounds against hCA I and hCA II were in the range of 2.14-16.32 mu M, and 0.34-2.52 mu M, respectively. Isozyme hCA IV was inhibited with K-I-s in the range of 0.435-5.726 mu M, while hCA VI with K-I-s of 1.92-12.84 mu M bCA III was inhibited with K-I-s in the range of 2.13-17.83 mu M. The structurally related compounds, 1,2-dimethoxybenzene, catechol and indole were also tested in order to understand the structure activity relationship. In silico docking studies of some derivatives within the active site of hCA I and II were also carried out in order to rationalize the inhibitory properties of these compounds and understand their inhibition mechanism. (C) 2011 Elsevier Masson SAS. All rights reserved.
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    Synthesis of 3,4-dihydroxypyrrolidine-2,5-dione and 3,5-dihydroxybenzoic acid derivatives and evaluation of the carbonic anhydrase I and II inhibition
    (Taylor & Francis LTD, 2015) Arslan, Mehmet; Şentürk, Murat; Fidan, İsmail; Talaz, Oktay; Ekinci, Deniz; Coşgun, Sedat; Supuran, Claudiu T.
    The inhibition of two human cytosolic carbonic anhydrase (hCA, EC 4.2.1.1) isozymes I and II, with some 3,4-dihydroxypyrrolidine-2,5-dione and 3,5-dihydroxybenzoic acid derivatives, were investigated by using the esterase assay, with 4-nitrophenyl acetate (4-NPA) as substrate. Compounds 10-13 showed K-I values in the range of 112.7-441.5 mu M for hCA I and of 3.5-10.76 mu M against hCA II, respectively. These hydroxyl group containing compounds generally were competitive inhibitors. Some hydroxyl group containing compounds investigated here showed effective hCA II inhibitory effects, in the same range as the clinically used sulfonamide acetazolamide, and might be used as leads for generating enzyme inhibitors possibly targeting other CA isoforms which have not been yet assayed for their interactions with such agents.