Ligand-Based Virtual Screening, Molecular Docking, Molecular Dynamics, and MM-PBSA Calculations towards the Identification of Potential Novel Ricin Inhibitors.

Botelho, Fernanda D; Dos Santos, Marcelo C.; da Silva Goncalves, Arlan; Kuca, Kamil; Valis, Martin; Laplante, Steven ORCID: https://orcid.org/0000-0003-2835-5789; Franca, Tanos Celmar Costa et de Almeida, Joyce S F D (2020). Ligand-Based Virtual Screening, Molecular Docking, Molecular Dynamics, and MM-PBSA Calculations towards the Identification of Potential Novel Ricin Inhibitors. Toxins , vol. 12 , nº e746. pp. 1-14. DOI: 10.3390/toxins12120746.

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Résumé

Ricin is a toxin found in the castor seeds and listed as a chemical weapon by the Chemical Weapons Convention (CWC) due to its high toxicity combined with the easiness of obtention and lack of available antidotes. The relatively frequent episodes of usage or attempting to use ricin in terrorist attacks reinforce the urge to develop an antidote for this toxin. In this sense, we selected in this work the current RTA (ricin catalytic subunit) inhibitor with the best experimental performance, as a reference molecule for virtual screening in the PubChem database. The selected molecules were then evaluated through docking studies, followed by drug-likeness investigation, molecular dynamics simulations and Molecular Mechanics Poisson-Boltzmann Surface Area (MM-PBSA) calculations. In every step, the selection of molecules was mainly based on their ability to occupy both the active and secondary sites of RTA, which are located right next to each other, but are not simultaneously occupied by the current RTA inhibitors. Results show that the three PubChem compounds 18309602, 18498053, and 136023163 presented better overall results than the reference molecule itself, showing up as new hits for the RTA inhibition, and encouraging further experimental evaluation.

Type de document:	Article
Mots-clés libres:	Chemical/Biological Warfare Agents; Ligand-Based Virtual Screening; Molecular Dynamics; Ricin; Ricin Inhibitors
Centre:	Centre INRS-Institut Armand Frappier
Date de dépôt:	30 juin 2022 14:10
Dernière modification:	07 nov. 2022 16:51
URI:	https://espace.inrs.ca/id/eprint/12304

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