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Kumawat A, Namsani S, Pramanik D, Roy S, Singh JK. Integrated docking and enhanced sampling-based selection of repurposing drugs for SARS-CoV-2 by targeting host dependent factors. J Biomol Struct Dyn 2022; 40:9897-9908. [PMID: 34155961 PMCID: PMC8220434 DOI: 10.1080/07391102.2021.1937319] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Since the onset of global pandemic, the most focused research currently in progress is the development of potential drug candidates and clinical trials of existing FDA approved drugs for other relevant diseases, in order to repurpose them for the COVID-19. At the same time, several high throughput screenings of drugs have been reported to inhibit the viral components during the early course of infection but with little proven efficacies. Here, we investigate the drug repurposing strategies to counteract the coronavirus infection which involves several potential targetable host proteins involved in viral replication and disease progression. We report the high throughput analysis of literature-derived repurposing drug candidates that can be used to target the genetic regulators known to interact with viral proteins based on experimental and interactome studies. In this work we have performed integrated molecular docking followed by molecular dynamics (MD) simulations and free energy calculations through an expedite in silico process where the number of screened candidates reduces sequentially at every step based on physicochemical interactions. We elucidate that in addition to the pre-clinical and FDA approved drugs that targets specific regulatory proteins, a range of chemical compounds (Nafamostat, Chloramphenicol, Ponatinib) binds to the other gene transcription and translation regulatory proteins with higher affinity and may harbour potential for therapeutic uses. There is a rapid growing interest in the development of combination therapy for COVID-19 to target multiple enzymes/pathways. Our in silico approach would be useful in generating leads for experimental screening for rapid drug repurposing against SARS-CoV-2 interacting host proteins.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Amit Kumawat
- Prescience Insilico Private Limited, Bangalore, India,Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India
| | | | - Debabrata Pramanik
- Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India
| | - Sudip Roy
- Prescience Insilico Private Limited, Bangalore, India,CONTACT Sudip Roy ;
| | - Jayant K. Singh
- Prescience Insilico Private Limited, Bangalore, India,Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India,Jayant K. Singh
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Namsani S, Pramanik D, Khan MA, Roy S, Singh JK. Metadynamics-based enhanced sampling protocol for virtual screening: case study for 3CLpro protein for SARS-CoV-2. J Biomol Struct Dyn 2021; 40:7002-7017. [PMID: 33663346 DOI: 10.1080/07391102.2021.1892530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
In recent times, computational methods played an important role in the down selection of chemical compounds, which could be a potential drug candidate with a high affinity to target proteins. However, the screening methodologies, including docking, often fails to identify the most effective compound, which could be a ligand for the target protein. To solve that, here we have integrated meta-dynamics, an enhanced sampling molecular simulation method, with all-atom molecular dynamics to determine a specific compound that could target the main protease of novel severe acute respiratory syndrome coronavirus 2 (SARS-COV-2). This combined computational approach uses the enhanced sampling to explore the free energy surface associated with the protein's binding site (including the ligand) in an explicit solvent. We have implemented this method to find new chemical entities that exhibit high specificity of binding to the 3-chymotrypsin-like cysteine protease (3CLpro) present in the SARS-CoV-2 and segregated to the most strongly bound ligands based on free energy and scoring functions (defined and implemented) from a set of 17 ligands which were prescreened for synthesizability and druggability. Additionally, we have compared these 17 ligands' affinities against controls, N3 and 13b α-ketoamide inhibitors, for which experimental crystal structures are available. Based on our results and analysis from the combined molecular simulation approach, we could identify the best compound which could be further taken as a potential candidate for experimental validation.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | - Debabrata Pramanik
- Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India
| | - Mohd Aamir Khan
- Prescience Insilico Private Limited, Bangalore, India.,Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India
| | - Sudip Roy
- Prescience Insilico Private Limited, Bangalore, India
| | - Jayant Kumar Singh
- Prescience Insilico Private Limited, Bangalore, India.,Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India
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Bangari RS, Singh AK, Namsani S, Singh JK, Sinha N. Magnetite-Coated Boron Nitride Nanosheets for the Removal of Arsenic(V) from Water. ACS Appl Mater Interfaces 2019; 11:19017-19028. [PMID: 31017758 DOI: 10.1021/acsami.8b22401] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
It is widely known that the existence of arsenic (As) in water negatively affects humans and the environment. We report the synthesis, characterization, and application of boron nitride nanosheets (BNNSs) and Fe3O4-functionalized BNNS (BNNS-Fe3O4) nanocomposite for removal of As(V) ions from aqueous systems. The morphology, surface properties, and compositions of synthesized nanomaterials were examined using scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, surface area analysis, zero-point charge, and magnetic moment determination. The BNNS-Fe3O4 nanocomposites have a specific surface area of 119 m2 g-1 and a high saturation magnetization of 49.19 emu g-1. Due to this strong magnetic property at room temperature, BNNS-Fe3O4 can be easily separated in solution by applying an external magnetic field. From the activation energies, it was found that the adsorption of As(V) ions on BNNSs and BNNS-Fe3O4 was due to physical and chemical adsorption, respectively. The maximum adsorption capacity of BNNS-Fe3O4 nanocomposite for As(V) ions has been found to be 26.3 mg g-1, which is 5 times higher than that of unmodified BNNSs (5.3 mg g-1). This closely matches density functional theory simulations, where it is found that binding energies between BNNS-Fe3O4 nanocomposite and As(OH)5 are 5 times higher than those between BNNSs and As(OH)5, implying 5 times higher adsorption capacity of BNNS-Fe3O4 nanocomposite than unmodified BNNSs. More importantly, it was observed that the synthesized BNNS-Fe3O4 nanocomposite could reduce As(V) ion concentration from 856 ppb in a solution to below 10 ppb (>98.83% removal), which is the permissible limit according to World Health Organization recommendations. Finally, the synthesized adsorbent showed both separation and regeneration properties. These findings demonstrate the potential of BNNS-Fe3O4 nanocomposite for commercial application in separation of As(V) ions from potable and waste water streams.
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Sappidi P, Namsani S, Ali SM, Singh JK. Extraction of Gd 3+ and UO 22+ Ions Using Polystyrene Grafted Dibenzo Crown Ether (DB18C6) with Octanol and Nitrobenzene: A Molecular Dynamics Study. J Phys Chem B 2018; 122:1334-1344. [PMID: 29281280 DOI: 10.1021/acs.jpcb.7b11384] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Atomistic molecular dynamics (MD) simulations are performed in order to derive thermodynamic properties important to understand the extraction of gadolinium (Gd3+) and uranium dioxide (UO2) with dibenzo crown ether (DBCE) in nitrobenzene (NB) and octanol (OCT) solvents. The effect of polystyrene graft length, on DBCE, on the binding behavior of Gd3+ and UO22+ is investigated for the first time. Our simulation results demonstrate that the binding of Gd3+ and UO22+ onto the oxygens of crown ethers is favorable for polystyrene grafted crown ether in the organic solvents OCT and NB. The metal ion binding free energy (ΔGBinding) in different solvent environments is calculated using the thermodynamic integration (TI) method. ΔGBinding becomes more favorable in both solvents, NB and OCT, with an increase in the polystyrene monomer length. The metal ion transferability from an aqueous phase to an organic phase is estimated by calculating transfer free-energy calculations (ΔGTransfer). ΔGTransfer is significantly favorable for both Gd3+ and UO22+ for the transfer from the aqueous phase to the organic phase (i.e., NB and OCT) via ion-complexation to DBCE with an increase in polystyrene length. The partition coefficient (log P) values for Gd3+ and UO22+ show a 5-fold increase in separation capacity with polystyrene grafted DBCE. We corroborate the observed behavior by further analyzing the structural and dynamical properties of the ions in different phases.
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Affiliation(s)
- Praveenkumar Sappidi
- Computational Nano Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology (IIT) Kanpur , Kanpur 208016, India
| | - Sadanandam Namsani
- Computational Nano Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology (IIT) Kanpur , Kanpur 208016, India
| | - Sk Musharaf Ali
- Chemical Engineering Division, Bhabha Atomic Research Center , Mumbai 400085, India
| | - Jayant Kumar Singh
- Computational Nano Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology (IIT) Kanpur , Kanpur 208016, India
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Namsani S, Gahtori B, Auluck S, Singh JK. An interaction potential to study the thermal structure evolution of a thermoelectric material: β-Cu2
Se. J Comput Chem 2017; 38:2161-2170. [DOI: 10.1002/jcc.24865] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 05/24/2017] [Accepted: 05/31/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Sadanandam Namsani
- Department of chemical engineering; Indian Institute of technology Kanpur; Kanpur 208016 India
| | - Bhasker Gahtori
- Materials Physics and Engineering Division, CSIR-National Physical Laboratory; CSIR-Network of Institutes for Solar Energy; Dr. K. S. Krishnan Road New Delhi 110012 India
| | - Sushil Auluck
- Materials Physics and Engineering Division, CSIR-National Physical Laboratory; CSIR-Network of Institutes for Solar Energy; Dr. K. S. Krishnan Road New Delhi 110012 India
| | - Jayant K. Singh
- Department of chemical engineering; Indian Institute of technology Kanpur; Kanpur 208016 India
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Abstract
The dynamics of dewetting of gold films on graphene surfaces is investigated using molecular dynamics simulation. The effect of temperature (973-1533 K), film diameter (30-40 nm) and film thickness (0.5-3 nm) on the dewetting mechanism, leading to the formation of nanoparticles, is reported. The dewetting behavior for films ≤5 Å is in contrast to the behavior seen for thicker films. The retraction velocity, in the order of ∼300 m s(-1) for a 1 nm film, decreases with an increase in film thickness, whereas it increases with temperature. However at no point do nanoparticles detach from the surface within the temperature range considered in this work. We further investigated the self-assembly behavior of nanoparticles on graphene at different temperatures (673-1073 K). The process of self-assembly of gold nanoparticles is favorable at lower temperatures than at higher temperatures, based on the free-energy landscape analysis. Furthermore, the shape of an assembled structure is found to change from spherical to hexagonal, with a marked propensity towards an icosahedral structure based on the bond-orientational order parameters.
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Affiliation(s)
- Sadanandam Namsani
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur-2018016, India.
| | - Jayant K Singh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur-2018016, India.
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Abstract
Comparison of water permeability and salt rejection of functionalized NPG sheets with existing technologies.
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Affiliation(s)
- Anitha Kommu
- Department of Chemical Engineering
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
| | - Sadanandam Namsani
- Department of Chemical Engineering
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
| | - Jayant K. Singh
- Department of Chemical Engineering
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
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Anitha K, Namsani S, Singh JK. Removal of Heavy Metal Ions Using a Functionalized Single-Walled Carbon Nanotube: A Molecular Dynamics Study. J Phys Chem A 2015; 119:8349-58. [DOI: 10.1021/acs.jpca.5b03352] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Affiliation(s)
- K. Anitha
- Department
of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India
| | - Sadanandam Namsani
- Department
of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India
| | - Jayant K Singh
- Department
of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India
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Namsani S, Nair NN, Singh JK. Interaction potential models for bulk ZnS, ZnS nanoparticle, and ZnS nanoparticle-PMMA from first-principles. J Comput Chem 2015; 36:1176-86. [PMID: 25899792 DOI: 10.1002/jcc.23912] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 02/06/2015] [Accepted: 03/11/2015] [Indexed: 11/09/2022]
Abstract
An ab initio derived transferable polarizable force-field has been developed for Zinc sulphide (ZnS) nanoparticle (NP) and ZnS NP-PMMA nanocomposite. The structure and elastic constants of bulk ZnS using the new force-field are within a few percent of experimental observables. The new force-field show remarkable ability to reproduce structures and nucleation energies of nanoclusters (Zn1S1-Zn12S12) as validated with that of the density functional theory calculations. A qualitative agreement of the radial distribution functions of Zn-O, in a ZnS nanocluster-PMMA system, obtained using molecular mechanics molecular dynamics (MD) and ab initio MD (AIMD) simulations indicates that the ZnS-PMMA interaction through Zn-O bonding is explained satisfactorily by our force-field.
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Affiliation(s)
- Sadanandam Namsani
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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Sharma A, Namsani S, Singh JK. Molecular simulation of shale gas adsorption and diffusion in inorganic nanopores. Molecular Simulation 2014. [DOI: 10.1080/08927022.2014.968850] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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