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  1. Article ; Online: Evaluation of structural and thermodynamic insight of ERβ with DPN and derivatives through MMGBSA/MMPBSA methods.

    Bello, Martiniano

    Steroids

    2023  Volume 201, Page(s) 109334

    Abstract: Estrogen receptors (ERs) are nuclear factors that exist as two subtypes: ERα and ERβ. Among the different selective ERβ agonist ligands, the widely used ERβ-selective agonist DPN (diarylpropionitrile) is highlighted. Recent experimental and thermodynamic ...

    Abstract Estrogen receptors (ERs) are nuclear factors that exist as two subtypes: ERα and ERβ. Among the different selective ERβ agonist ligands, the widely used ERβ-selective agonist DPN (diarylpropionitrile) is highlighted. Recent experimental and thermodynamic information between R-DPN and S-DPN enantiomers with ERβ is important for evaluating further the ability of MD simulations combined with end-point methods to reproduce experimental binding affinity and generate structural insight not provided through crystallographic data. In this research, starting from crystallographic data and experimental binding affinities, we explored the structural and thermodynamic basis of the molecular recognition of ERβ with DPN and derivatives through triplicate MD simulations combined with end-point methods. Conformational analysis showed some regions with the highest mobility linked to ligand association that, at the time, impacted the total protein fluctuation. Binding free energy (ΔG) analysis revealed that the Molecular Mechanics Generalized-Born Surface Area (MMGBSA) approach was able to reproduce the experimental tendency with a strong correlation (R = 0.778), whereas per-residue decomposition analysis revealed that all the systems interacted strongly with eight residues (L298, E305, L339, M340, L343, F356, H475, and L476). The comparison between theoretical studies using the MMGBSA approach with experimental results provides new insights for drug designing of new DPN derivatives.
    MeSH term(s) Estrogen Receptor beta/metabolism ; Receptors, Estrogen/metabolism ; Estrogen Receptor alpha/metabolism ; Ligands ; Molecular Conformation ; Thermodynamics ; Nitriles/chemistry ; Estradiol
    Chemical Substances Estrogen Receptor beta ; Receptors, Estrogen ; Estrogen Receptor alpha ; Ligands ; Nitriles ; Estradiol (4TI98Z838E)
    Language English
    Publishing date 2023-11-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 80312-1
    ISSN 1878-5867 ; 0039-128X
    ISSN (online) 1878-5867
    ISSN 0039-128X
    DOI 10.1016/j.steroids.2023.109334
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Molecular recognition of tak-285 and lapatinib by inactive, active, and middle active-inactive HER2.

    Martiniano, Bello

    Journal of molecular modeling

    2021  Volume 27, Issue 4, Page(s) 105

    Abstract: Experimental and theoretical studies have provided structural information regarding the shift from inactive to active EGFR, throughout which both conformations are linked via binding to specific tyrosine kinase inhibitors. For HER2, an intermediate ... ...

    Abstract Experimental and theoretical studies have provided structural information regarding the shift from inactive to active EGFR, throughout which both conformations are linked via binding to specific tyrosine kinase inhibitors. For HER2, an intermediate active-inactive receptor conformation is present in the PDB, which has been co-crystallized with tak-285. The affinity of HER2 in monomeric state to tak-285 has been previously reported. However, the lack of structural knowledge of HER2 limits our capacity to understand whether tak-285, or other known HER2 inhibitors, selectively bind active, inactive, or intermediate forms of HER2. To elucidate mechanisms by which tak-285 binds to HER2, we first obtained information regarding the structural features of the active state of HER2 via microsecond MD simulations from the crystallized intermediate structure previously determined. Based on these HER2 conformers, together with the inactive HER2 conformer obtained in a previous study, we used docking and MD simulations coupled to MMGBSA approach to assess binding of tak-285 and lapatinib, known HER2/EGFR dual inhibitors, to HER2. Structural and energetic studies revealed that tak-285 binds with a greater affinity than lapatinib to active and intermediate active-inactive forms of HER2. This is in accordance with experimental findings that showed the tak-285 inhibitor has increased activity relative to lapatinib in breast cancer cell lines.
    MeSH term(s) Antineoplastic Agents/chemistry ; Bridged Bicyclo Compounds, Heterocyclic/chemistry ; Humans ; Hydroxybutyrates/chemistry ; Lapatinib/chemistry ; Models, Molecular ; Molecular Conformation ; Molecular Docking Simulation ; Molecular Dynamics Simulation ; Receptor, ErbB-2/chemistry
    Chemical Substances Antineoplastic Agents ; Bridged Bicyclo Compounds, Heterocyclic ; Hydroxybutyrates ; Lapatinib (0VUA21238F) ; N-(2-(4-((3-chloro-4-(3-(trifluoromethyl)phenoxy)phenyl)amino)-5H-pyrrolo(3,2-d)pyrimidin-5-yl)ethyl)-3-hydroxy-3-methylbutanamide (70CCB438L6) ; ERBB2 protein, human (EC 2.7.10.1) ; Receptor, ErbB-2 (EC 2.7.10.1)
    Language English
    Publishing date 2021-03-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1284729-X
    ISSN 0948-5023 ; 1610-2940
    ISSN (online) 0948-5023
    ISSN 1610-2940
    DOI 10.1007/s00894-021-04720-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Molecular Basis of Inhibitory Mechanism of Naltrexone and Its Metabolites through Structural and Energetic Analyses

    Martiniano Bello

    Molecules, Vol 27, Iss 4919, p

    2022  Volume 4919

    Abstract: Naltrexone is a potent opioid antagonist with good blood–brain barrier permeability, targeting different endogenous opioid receptors, particularly the mu-opioid receptor (MOR). Therefore, it represents a promising candidate for drug development against ... ...

    Abstract Naltrexone is a potent opioid antagonist with good blood–brain barrier permeability, targeting different endogenous opioid receptors, particularly the mu-opioid receptor (MOR). Therefore, it represents a promising candidate for drug development against drug addiction. However, the details of the molecular interactions of naltrexone and its derivatives with MOR are not fully understood, hindering ligand-based drug discovery. In the present study, taking advantage of the high-resolution X-ray crystal structure of the murine MOR (mMOR), we constructed a homology model of the human MOR (hMOR). A solvated phospholipid bilayer was built around the hMOR and submitted to microsecond (µs) molecular dynamics (MD) simulations to obtain an optimized hMOR model. Naltrexone and its derivatives were docked into the optimized hMOR model and submitted to µs MD simulations in an aqueous membrane system. The MD simulation results were submitted to the molecular mechanics–generalized Born surface area (MMGBSA) binding free energy calculations and principal component analysis. Our results revealed that naltrexone and its derivatives showed differences in protein–ligand interactions; however, they shared contacts with residues at TM2, TM3, H6, and TM7. The binding free energy and principal component analysis revealed the structural and energetic effects responsible for the higher potency of naltrexone compared to its derivatives.
    Keywords naltrexone ; mu-opioid receptor ; MD simulations ; MMGBSA ; binding free energy ; Organic chemistry ; QD241-441
    Subject code 540
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Molecular Basis of Inhibitory Mechanism of Naltrexone and Its Metabolites through Structural and Energetic Analyses.

    Bello, Martiniano

    Molecules (Basel, Switzerland)

    2022  Volume 27, Issue 15

    Abstract: Naltrexone is a potent opioid antagonist with good blood-brain barrier permeability, targeting different endogenous opioid receptors, particularly the mu-opioid receptor (MOR). Therefore, it represents a promising candidate for drug development against ... ...

    Abstract Naltrexone is a potent opioid antagonist with good blood-brain barrier permeability, targeting different endogenous opioid receptors, particularly the mu-opioid receptor (MOR). Therefore, it represents a promising candidate for drug development against drug addiction. However, the details of the molecular interactions of naltrexone and its derivatives with MOR are not fully understood, hindering ligand-based drug discovery. In the present study, taking advantage of the high-resolution X-ray crystal structure of the murine MOR (mMOR), we constructed a homology model of the human MOR (hMOR). A solvated phospholipid bilayer was built around the hMOR and submitted to microsecond (µs) molecular dynamics (MD) simulations to obtain an optimized hMOR model. Naltrexone and its derivatives were docked into the optimized hMOR model and submitted to µs MD simulations in an aqueous membrane system. The MD simulation results were submitted to the molecular mechanics-generalized Born surface area (MMGBSA) binding free energy calculations and principal component analysis. Our results revealed that naltrexone and its derivatives showed differences in protein-ligand interactions; however, they shared contacts with residues at TM2, TM3, H6, and TM7. The binding free energy and principal component analysis revealed the structural and energetic effects responsible for the higher potency of naltrexone compared to its derivatives.
    MeSH term(s) Animals ; Humans ; Ligands ; Mice ; Molecular Dynamics Simulation ; Naltrexone/pharmacology ; Narcotic Antagonists/pharmacology ; Receptors, Opioid, mu/metabolism ; Water
    Chemical Substances Ligands ; Narcotic Antagonists ; Receptors, Opioid, mu ; Water (059QF0KO0R) ; Naltrexone (5S6W795CQM)
    Language English
    Publishing date 2022-08-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules27154919
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Structural basis of Nrf2 activation by flavonolignans from silymarin.

    Bello, Martiniano

    Journal of molecular graphics & modelling

    2022  Volume 119, Page(s) 108393

    Abstract: Several properties of silymarin (SM) extract have been attributed to their three major flavonolignans (silybin, silychristin, and silydianin) and their 2,3-dehydro derivatives (2,3-dehydrosilybin, 2,3-dehydrosilychristin, and 2,3-dehydrosilydianin). ... ...

    Abstract Several properties of silymarin (SM) extract have been attributed to their three major flavonolignans (silybin, silychristin, and silydianin) and their 2,3-dehydro derivatives (2,3-dehydrosilybin, 2,3-dehydrosilychristin, and 2,3-dehydrosilydianin). Experimental findings have suggested that the antioxidative and protective activities of these compounds could be due to their ability to activate nuclear factor erythroid 2-related factor 2 (Nrf2). The mechanism by which SM compounds exert their effect has been suggested to be by disrupting the complex between Nrf2 and Kelch-like ECH-associated protein 1 (Keap1). However, information about the structural and energetic basis of the inhibitory mechanism of SM compounds on the Nrf2-Keap1 pathway is lacking. We evaluated the binding properties of SM compounds because experimental findings have pointed to them as potential activators of Nrf2. Our study combined docking and molecular dynamics (MD) simulations with the Poisson-Boltzmann and generalized Born and surface area (MMPBSA and MMGBSA) methods and quantum mechanics-molecular mechanics (QMMM) calculations to investigate Keap1-ligand interactions. Our results predicted that silybin
    MeSH term(s) Silybin ; Kelch-Like ECH-Associated Protein 1/chemistry ; Kelch-Like ECH-Associated Protein 1/metabolism ; NF-E2-Related Factor 2/metabolism ; Silymarin/pharmacology ; Silymarin/chemistry ; Antioxidants/pharmacology ; Antioxidants/chemistry
    Chemical Substances Silybin (4RKY41TBTF) ; Kelch-Like ECH-Associated Protein 1 ; NF-E2-Related Factor 2 ; Silymarin ; Antioxidants
    Language English
    Publishing date 2022-12-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1396450-1
    ISSN 1873-4243 ; 1093-3263
    ISSN (online) 1873-4243
    ISSN 1093-3263
    DOI 10.1016/j.jmgm.2022.108393
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Evaluation of

    Culhuac, Erick Bahena / Bello, Martiniano

    Molecules (Basel, Switzerland)

    2024  Volume 29, Issue 8

    Abstract: Allergic rhinitis (AR) is a prevalent inflammatory condition affecting millions globally, with current treatments often associated with significant side effects. To seek safer and more effective alternatives, natural sources ... ...

    Abstract Allergic rhinitis (AR) is a prevalent inflammatory condition affecting millions globally, with current treatments often associated with significant side effects. To seek safer and more effective alternatives, natural sources like
    MeSH term(s) Phytochemicals/chemistry ; Phytochemicals/pharmacology ; Phytochemicals/therapeutic use ; Molecular Docking Simulation ; Rhinitis, Allergic/drug therapy ; Molecular Dynamics Simulation ; Humans ; Urtica dioica/chemistry ; Plant Extracts/chemistry ; Plant Extracts/pharmacology
    Chemical Substances Phytochemicals ; Plant Extracts
    Language English
    Publishing date 2024-04-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules29081765
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  7. Article ; Online: Elucidation of the inhibitory activity of ivermectin with host nuclear importin α and several SARS-CoV-2 targets.

    Bello, Martiniano

    Journal of biomolecular structure & dynamics

    2021  Volume 40, Issue 18, Page(s) 8375–8383

    Abstract: Ivermectin (IVM) is an FDA-approved drug that has shown antiviral activity against a wide variety of viruses in recent years. IVM inhibits the formation of the importin-α/β1 heterodimeric complex responsible for the translocation and replication of ... ...

    Abstract Ivermectin (IVM) is an FDA-approved drug that has shown antiviral activity against a wide variety of viruses in recent years. IVM inhibits the formation of the importin-α/β1 heterodimeric complex responsible for the translocation and replication of various viral species proteins. Also, IVM hampers SARS-CoV-2 replication in vitro; however, the molecular mechanism through which IVM inhibits SARS-CoV-2 is not well understood. Previous studies have explored the molecular mechanism through which IVM inhibits importin-α and several potential targets associated with COVID-19 by using docking approaches and MD simulations to corroborate the docked complexes. This study explores the energetic and structural properties through which IVM inhibits importin-α and five targets associated with COVID-19 by using docking and MD simulations combined with the molecular mechanics generalized Born surface area (MMGBSA) approach. Energetic and structural analysis showed that the main protease 3CL
    MeSH term(s) Antiviral Agents/chemistry ; Antiviral Agents/pharmacology ; COVID-19 ; Humans ; Ivermectin/pharmacology ; Molecular Docking Simulation ; Molecular Dynamics Simulation ; Peptide Hydrolases/metabolism ; Protease Inhibitors/chemistry ; SARS-CoV-2 ; Viral Proteins ; alpha Karyopherins
    Chemical Substances Antiviral Agents ; Protease Inhibitors ; Viral Proteins ; alpha Karyopherins ; Ivermectin (70288-86-7) ; Peptide Hydrolases (EC 3.4.-)
    Language English
    Publishing date 2021-04-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 49157-3
    ISSN 1538-0254 ; 0739-1102
    ISSN (online) 1538-0254
    ISSN 0739-1102
    DOI 10.1080/07391102.2021.1911857
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Evaluating the ability of end-point methods to predict the binding affinity tendency of protein kinase inhibitors.

    Bello, Martiniano / Bandala, Cindy

    RSC advances

    2023  Volume 13, Issue 36, Page(s) 25118–25128

    Abstract: Because of the high economic cost of exploring the experimental impact of mutations occurring in kinase proteins, computational approaches have been employed as alternative methods for evaluating the structural and energetic aspects of kinase mutations. ... ...

    Abstract Because of the high economic cost of exploring the experimental impact of mutations occurring in kinase proteins, computational approaches have been employed as alternative methods for evaluating the structural and energetic aspects of kinase mutations. Among the main computational methods used to explore the affinity linked to kinase mutations are docking procedures and molecular dynamics (MD) simulations combined with end-point methods or alchemical methods. Although it is known that end-point methods are not able to reproduce experimental binding free energy (Δ
    Language English
    Publishing date 2023-08-22
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d3ra04916g
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Prediction of potential inhibitors of the dimeric SARS-CoV2 main proteinase through the MM/GBSA approach.

    Bello, Martiniano

    Journal of molecular graphics & modelling

    2020  Volume 101, Page(s) 107762

    Abstract: Since the emergence of SARS-CoV2, to date, no effective antiviral drug has been approved to treat the disease, and no vaccine against SARS-CoV2 is available. Under this scenario, the combination of two HIV-1 protease inhibitors, lopinavir and ritonavir, ... ...

    Abstract Since the emergence of SARS-CoV2, to date, no effective antiviral drug has been approved to treat the disease, and no vaccine against SARS-CoV2 is available. Under this scenario, the combination of two HIV-1 protease inhibitors, lopinavir and ritonavir, has attracted attention since they have been previously employed against the SARS-CoV main proteinase (M
    MeSH term(s) Antiviral Agents/chemistry ; Antiviral Agents/pharmacology ; Coronavirus 3C Proteases ; Cysteine Endopeptidases/chemistry ; Cysteine Endopeptidases/metabolism ; Lopinavir/chemistry ; Lopinavir/pharmacology ; Molecular Docking Simulation ; Molecular Dynamics Simulation ; Principal Component Analysis ; Protease Inhibitors/chemistry ; Protease Inhibitors/pharmacology ; Protein Conformation ; Protein Multimerization ; Ritonavir/chemistry ; Ritonavir/pharmacology ; Viral Nonstructural Proteins/antagonists & inhibitors ; Viral Nonstructural Proteins/chemistry ; Viral Nonstructural Proteins/metabolism
    Chemical Substances Antiviral Agents ; Protease Inhibitors ; Viral Nonstructural Proteins ; Lopinavir (2494G1JF75) ; Cysteine Endopeptidases (EC 3.4.22.-) ; Coronavirus 3C Proteases (EC 3.4.22.28) ; Ritonavir (O3J8G9O825)
    Keywords covid19
    Language English
    Publishing date 2020-09-24
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1396450-1
    ISSN 1873-4243 ; 1093-3263
    ISSN (online) 1873-4243
    ISSN 1093-3263
    DOI 10.1016/j.jmgm.2020.107762
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Structural mechanism of the Tanford transition of bovine β-lactoglobulin through microsecond molecular dynamics simulations.

    Bello, Martiniano

    Journal of biomolecular structure & dynamics

    2020  Volume 40, Issue 7, Page(s) 3011–3023

    Abstract: X-ray analysis has provided structural data about a pH-driven conformational change in β-lactoglobulin (BLG) known as the Tanford transition, which occurs at around pH 7 and involves the EF loop, which acts as a lid closing the internal cavity of the ... ...

    Abstract X-ray analysis has provided structural data about a pH-driven conformational change in β-lactoglobulin (BLG) known as the Tanford transition, which occurs at around pH 7 and involves the EF loop, which acts as a lid closing the internal cavity of the protein below pH 7 and opening it above pH 7. NMR studies using wild-type BLG have encountered problems trying to explain the Tanford transition, however, they have provided important insight using a dimeric BLG mutant, revealing that the opening and closure of the EF loop consists of two types of motions in the microsecond and milliseconds timescales. This provides valuable information indicating that the dimeric state is a good model to study the Tanford transition, although the understanding of this structural change is still lacking at the atomic level. We performed microsecond molecular dynamics (MD) simulations starting from different conformations of BLG in the monomeric and dimeric state, with protonated and deprotonated E89, in order to explore the Tanford transition. Our results provide structural information for the transition from the closed to the open conformation in BLG and show it occurs in the dimeric state in the microsecond timescale, in line with the fast motion observed through NMR experiments. In addition, MD simulations coupled to MMGBSA approach indicated that the most populated conformer of BLG in the open state is able to bind ligands with similar affinity to that of BLG at neutral pH obtained through crystallographic experiments.Communicated by Ramaswamy H. Sarma.
    MeSH term(s) Animals ; Cattle ; Hydrogen-Ion Concentration ; Lactoglobulins/chemistry ; Ligands ; Magnetic Resonance Spectroscopy ; Molecular Dynamics Simulation ; Protein Conformation
    Chemical Substances Lactoglobulins ; Ligands
    Language English
    Publishing date 2020-11-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 49157-3
    ISSN 1538-0254 ; 0739-1102
    ISSN (online) 1538-0254
    ISSN 0739-1102
    DOI 10.1080/07391102.2020.1844062
    Database MEDical Literature Analysis and Retrieval System OnLINE

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