4APN
Structure of TR from Leishmania infantum in complex with a diarylpirrole-based inhibitor
Summary for 4APN
| Entry DOI | 10.2210/pdb4apn/pdb |
| Related | 2JK6 2W0H 2X50 2YAU 4ADW |
| Descriptor | TRYPANOTHIONE REDUCTASE, FLAVIN-ADENINE DINUCLEOTIDE, NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE, ... (5 entities in total) |
| Functional Keywords | oxidoreductase, trypanosomatids |
| Biological source | LEISHMANIA INFANTUM |
| Total number of polymer chains | 2 |
| Total formula weight | 115267.63 |
| Authors | Baiocco, P.,Ilari, A.,Colotti, G.,Biava, M. (deposition date: 2012-04-04, release date: 2013-04-17, Last modification date: 2023-12-20) |
| Primary citation | Baiocco, P.,Poce, G.,Alfonso, S.,Cocozza, M.,Porretta, G.C.,Colotti, G.,Biava, M.,Moraca, F.,Botta, M.,Yardley, V.,Fiorillo, A.,Lantella, A.,Malatesta, F.,Ilari, A. Inhibition of Leishmania Infantum Trypanothione Reductase by Azole-Based Compounds: A Comparative Analysis with its Physiological Substrate by X-Ray Crystallography. Chemmedchem, 8:1175-, 2013 Cited by PubMed Abstract: Herein we report a study aimed at discovering a new class of compounds that are able to inhibit Leishmania donovani cell growth. Evaluation of an in-house library of compounds in a whole-cell screening assay highlighted 4-((1-(4-ethylphenyl)-2-methyl-5-(4-(methylthio)phenyl)-1H-pyrrol-3-yl)methyl)thiomorpholine (compound 1) as the most active. Enzymatic assays on Leishmania infantum trypanothione reductase (LiTR, belonging to the Leishmania donovani complex) shed light on both the interaction with, and the nature of inhibition by, compound 1. A molecular modeling approach based on docking studies and on the estimation of the binding free energy aided our rationalization of the biological data. Moreover, X-ray crystal structure determination of LiTR in complex with compound 1 confirmed all our results: compound 1 binds to the T(SH)2 binding site, lined by hydrophobic residues such as Trp21 and Met113, as well as residues Glu18 and Tyr110. Analysis of the structure of LiTR in complex with trypanothione shows that Glu18 and Tyr110 are also involved in substrate binding, according to a competitive inhibition mechanism. PubMed: 23733388DOI: 10.1002/CMDC.201300176 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (3.2 Å) |
Structure validation
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