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Medicinal Chemistry

Author(s): Michalis Platis, Dimitrios Vlachakis, Ahmed I. Foudah, Magdy M. Muharram, Mohamed H. Alqarni, Anastassios C. Papageorgiou and Nikolaos E. Labrou*

DOI: 10.2174/1573406416666200403074742

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The Interaction of Schistosoma Japonicum Glutathione Transferase with Cibacron Blue 3GA and its Fragments

Page: [332 - 343] Pages: 12

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Abstract

Background: The 26kDa glutathione transferase (GST, EC 2.5.1.18) from Schistosoma japonicum (SjGST) is recognized as the major detoxification enzyme of S. japonicum, a pathogenic helminth causing schistosomiasis.

Objective: In the present study, the interaction of the chlorotriazine dye Cibacron blue 3GA (CB3GA) and its structural analogues with SjGST was investigated. The work aimed to shed light on the non-substrate ligand-binding properties of the enzyme.

Methods: Kinetic inhibition analysis, affinity labelling experiments and molecular modelling studies were employed.

Results: The results showed that CB3GA is a potent inhibitor (IC50 0.057 ± 0.003 μM) towards SjGST. The enzyme was specifically and irreversibly inactivated by the dichlorotriazine-analogue of CB3GA (IC50 0.190 ± 0.024 μM), following a biphasic pseudo-first-order saturation kinetics with approximately 1 mol of inhibitor per mol of the dimeric enzyme being incorporated. All other monochlorotriazine analogues behave as reversible inhibitors with lower inhibition potency (IC50 5.2-82.3 μM). Kinetic inhibition studies, together with molecular modelling and molecular dynamics simulations, established that the CB3GA binding site overlaps both the G- and H-sites. Both hydrophobic/ polar interactions, as well as steric effects, have decisive roles in determining the inhibitory strength of CB3GA and its analogues.

Conclusion: The results of the present study might be useful in future drug design and development efforts towards SjGST.

Keywords: Affinity labelling, Cibacron Blue 3GA, Schistosoma japonicum, schistosomiasis, structure-guided drug design, triazine dyes.

Graphical Abstract

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