PUBLICATION
Functional, thermodynamics, structural and biological studies of in silico-identified inhibitors of Mycobacterium tuberculosis enoyl-ACP(CoA) reductase enzyme
- Authors
- Martinelli, L.K.B., Rotta, M., Villela, A.D., Rodrigues-Junior, V.S., Abbadi, B.L., Trindade, R.V., Petersen, G.O., Danesi, G.M., Nery, L.R., Pauli, I., Campos, M.M., Bonan, C.D., de Souza, O.N., Basso, L.A., Santos, D.S.
- ID
- ZDB-PUB-170425-7
- Date
- 2017
- Source
- Scientific Reports 7: 46696 (Journal)
- Registered Authors
- Bonan, Carla Denise
- Keywords
- Enzyme mechanisms, Enzymes, Pharmaceutics
- MeSH Terms
-
- Animals
- Antitubercular Agents/pharmacology
- Bacterial Proteins/antagonists & inhibitors*
- Bacterial Proteins/metabolism
- Cell Line
- Chlorocebus aethiops
- Computer Simulation*
- Enzyme Inhibitors/pharmacology*
- Humans
- Kinetics
- Mice
- Microbial Sensitivity Tests
- Mycobacterium tuberculosis/drug effects*
- Mycobacterium tuberculosis/enzymology
- Mycobacterium tuberculosis/physiology
- Oxidoreductases/antagonists & inhibitors*
- Oxidoreductases/metabolism
- RAW 264.7 Cells
- Thermodynamics*
- Tuberculosis/microbiology
- Vero Cells
- PubMed
- 28436453 Full text @ Sci. Rep.
Citation
Martinelli, L.K.B., Rotta, M., Villela, A.D., Rodrigues-Junior, V.S., Abbadi, B.L., Trindade, R.V., Petersen, G.O., Danesi, G.M., Nery, L.R., Pauli, I., Campos, M.M., Bonan, C.D., de Souza, O.N., Basso, L.A., Santos, D.S. (2017) Functional, thermodynamics, structural and biological studies of in silico-identified inhibitors of Mycobacterium tuberculosis enoyl-ACP(CoA) reductase enzyme. Scientific Reports. 7:46696.
Abstract
Novel chemotherapeutics agents are needed to kill Mycobacterium tuberculosis, the main causative agent of tuberculosis (TB). The M. tuberculosis 2-trans-enoyl-ACP(CoA) reductase enzyme (MtInhA) is the druggable bona fide target of isoniazid. New chemotypes were previously identified by two in silico approaches as potential ligands to MtInhA. The inhibition mode was determined by steady-state kinetics for seven compounds that inhibited MtInhA activity. Dissociation constant values at different temperatures were determined by protein fluorescence spectroscopy. van't Hoff analyses of ligand binding to MtInhA:NADH provided the thermodynamic signatures of non-covalent interactions (ΔH°, ΔS°, ΔG°). Phenotypic screening showed that five compounds inhibited in vitro growth of M. tuberculosis H37Rv strain. Labio_16 and Labio_17 compounds also inhibited the in vitro growth of PE-003 multidrug-resistant strain. Cytotoxic effects on Hacat, Vero and RAW 264.7 cell lines were assessed for the latter two compounds. The Labio_16 was bacteriostatic and Labio_17 bactericidal in an M. tuberculosis-infected macrophage model. In Zebrafish model, Labio_16 showed no cardiotoxicity whereas Labio_17 showed dose-dependent cardiotoxicity. Accordingly, a model was built for the MtInhA:NADH:Labio_16 ternary complex. The results show that the Labio_16 compound is a direct inhibitor of MtInhA, and it may represent a hit for the development of chemotherapeutic agents to treat TB.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping