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Exploring the inhibitory potential of Saussurea costus and Saussurea involucrata phytoconstituents against the Spike glycoprotein receptor binding domain of SARS-CoV-2 Delta (B.1.617.2) variant and the main protease (Mpro) as therapeutic candidates, using Molecular docking, DFT, and ADME/Tox studies.
Houchi, Selma; Messasma, Zakia.
  • Houchi S; Department of Biochemistry, Laboratory of Applied Biochemistry, Faculty of Life and Nature Sciences, University of Ferhat Abbas Setif-1, Algeria.
  • Messasma Z; Department of Process Engineering, Laboratory of Electrochemistry, Molecular Engineering and Redox Catalysis, Faculty of Technology, University of Ferhat Abbas Setif-1, 19000, Algeria.
J Mol Struct ; 1263: 133032, 2022 Sep 05.
Article in English | MEDLINE | ID: covidwho-1778380
ABSTRACT
The B.1.617.2 Delta variant is considered to be the most infectious of all SARS-CoV2 variants. Here, an attempt has been made through in-silico screening of 55 bioactive compounds from two selected plants, Saussurea costus and Saussurea involucrata as potential inhibitors of two viral proteases, main protease Mpro (PDB ID6LU7) and the RBD of SGP of Sars-CoV-2 B1.617.2 Delta variant (PDB ID7ORB) where the binding energy, molecular interactions, ADMET/Tox, chemical descriptors and Quantum-Chemical Calculations were explored. Molecular docking results demonstrated that the three top docked compounds formed relatively stable complexes within the active site and displayed remarkable binding energy in the order of Tangshenoside III, Rutin and Hesperidin (-9.35, -9.14 and -8.57 kcal/mol, respectively) with Mpro and Rutin, Tangshenoside III and Hesperidin (-9.07, -7.71 and -7.57 kcal/mol) with RBD of SGP. These compounds are non-Mutagen and non-carcinogen. Therefore, according to the Lipinski's Rule of Five they exhibited three violations concerning hydrogen acceptor, donor and molecular weight. However, based on the Quantum-Chemical Calculations results the selected ligands have effective reactivity, as they showed lower band gaps. The difference of the ELUMO and EHOMO was low, ranging from 0.0639 to 0.0978 a.u, implying the strong affinity of these inhibitors towards the target proteins. Among the three inhibitors, Rutin exhibited higher reactivity against two viral proteases, main protease (Mpro) and the Sars-CoV-2 B1.617.2, as the band energy gap was lowest among all the three phytochemicals, 0.0639 a.u This could indicate that Rutincan be potential anti-viral drug candidates against the existing SARS-CoV-2, the B.1.617.2 Delta variant.
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Full text: Available Collection: International databases Database: MEDLINE Topics: Variants Language: English Journal: J Mol Struct Year: 2022 Document Type: Article Affiliation country: J.molstruc.2022.133032

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Full text: Available Collection: International databases Database: MEDLINE Topics: Variants Language: English Journal: J Mol Struct Year: 2022 Document Type: Article Affiliation country: J.molstruc.2022.133032