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Open AccessArticle

Compounds from Terminalia mantaly L. (Combretaceae) Stem Bark Exhibit Potent Inhibition against Some Pathogenic Yeasts and Enzymes of Metabolic Significance

Laboratory of Natural Products and Organic Synthesis, Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
Antimicrobial & Biocontrol Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
Chemistry Department, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, D-33501 Bielefeld, Germany
Faculty of Engineering, Department of Industrial Engineering, Giresun University, 28200 Giresun, Turkey
Faculty of Pharmacy, Department of Basic Pharmaceutical Sciences, Agrı Ibrahim Cecen University, 04100 Agri, Turkey
School of Health, Department of Nutrition and Dietetics, Agrı Ibrahim Cecen University, 04100 Agri, Turkey
Department of Chemistry, Higher Teacher Training College, University of Yaoundé 1, Yaoundé, Cameroon
Authors to whom correspondence should be addressed.
Academic Editor: James D. Adams
Medicines 2017, 4(1), 6;
Received: 1 November 2016 / Revised: 23 December 2016 / Accepted: 12 January 2017 / Published: 24 January 2017
(This article belongs to the Special Issue Plant Medicines for Clinical Trial)
Background: Pathogenic yeasts resistance to current drugs emphasizes the need for new, safe, and cost-effective drugs. Also, new inhibitors are needed to control the effects of enzymes that are implicated in metabolic dysfunctions such as cancer, obesity, and epilepsy. Methods: The anti-yeast extract from Terminalia mantaly (Combretaceae) was fractionated and the structures of the isolated compounds established by means of spectroscopic analysis and comparison with literature data. Activity was assessed against Candida albicans, C. parapsilosis and C. krusei using the microdilution method, and against four enzymes of metabolic significance: glucose-6-phosphate dehydrogenase, human erythrocyte carbonic anhydrase I and II, and glutathione S-transferase. Results: Seven compounds, 3,3′-di-O-methylellagic acid 4′-O-α-rhamnopyranoside; 3-O-methylellagic acid; arjungenin or 2,3,19,23-tetrahydroxyolean-12-en-28-oïc acid; arjunglucoside or 2,3,19,23-tetrahydroxyolean-12-en-28-oïc acid glucopyranoside; 2α,3α,24-trihydroxyolean-11,13(18)-dien-28-oïc acid; stigmasterol; and stigmasterol 3-O-β-d-glucopyranoside were isolated from the extract. Among those, 3,3′-di-O-methylellagic acid 4′-O-α-rhamnopyranoside, 3-O-methylellagic acid, and arjunglucoside showed anti-yeast activity comparable to that of reference fluconazole with minimal inhibitory concentrations (MIC) below 32 µg/mL. Besides, Arjunglucoside potently inhibited the tested enzymes with 50% inhibitory concentrations (IC50) below 4 µM and inhibitory constant (Ki) <3 µM. Conclusions: The results achieved indicate that further SAR studies will likely identify potent hit derivatives that should subsequently enter the drug development pipeline. View Full-Text
Keywords: Terminalia mantaly; Combretaceae; anti-yeast; enzyme inhibitors Terminalia mantaly; Combretaceae; anti-yeast; enzyme inhibitors
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Tchuente Tchuenmogne, M.A.; Kammalac, T.N.; Gohlke, S.; Kouipou, R.M.T.; Aslan, A.; Kuzu, M.; Comakli, V.; Demirdag, R.; Ngouela, S.A.; Tsamo, E.; Sewald, N.; Lenta, B.N.; Boyom, F.F. Compounds from Terminalia mantaly L. (Combretaceae) Stem Bark Exhibit Potent Inhibition against Some Pathogenic Yeasts and Enzymes of Metabolic Significance. Medicines 2017, 4, 6.

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