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Bera A, Mukherjee S, Patra N. Exploring transmembrane allostery in the MexB: DB08385 variant as a promising inhibitor-like candidate against Pseudomonas aeruginosa antibiotic resistance: a computational study. Phys Chem Chem Phys 2024; 26:17011-17027. [PMID: 38835320 DOI: 10.1039/d4cp01620c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Pseudomonas aeruginosa, a formidable pathogen renowned for its antimicrobial resistance, poses a significant threat to immunocompromised individuals. In this regard, the MexAB-OprM efflux pump acts as a pivotal line of defense by extruding antimicrobials from bacterial cells. The inner membrane homotrimeric protein MexB captures antibiotics and translocates them into the outer membrane OprM channel protein connected through the MexA adaptor protein. Despite extensive efforts, competitive inhibitors targeting the tight (T) protomer of the MexB protein have not received FDA approval for medical use. Over the past few years, allosteric inhibitors have become popular as alternatives to the classical competitive inhibitor-based approach because of their higher specificity, lower dosage, and reduced toxicological effects. Hence, in this study, we unveiled the existence of a transmembrane allosteric binding pocket of MexB inspired by the recent discovery of an important allosteric inhibitor, BDM88855, for the homolog AcrB protein. While repurposing BDM88855 proved ineffective in controlling the MexB loose (L) protomer, our investigation identified a promising alternative: a chlorine-containing variant of DB08385 (2-Cl DB08385 or Variant 1). Molecular dynamics simulations, including binding free energy estimation coupled with heterogeneous dielectric implicit membrane model (implicit-membrane MM/PBSA), interaction entropy (IE) analysis and potential of mean force (PMF) calculation, demonstrated Variant 1's superior binding affinity to the transmembrane pocket, displaying the highest energy barrier in the ligand unbinding process. To elucidate the allosteric crosstalk between the transmembrane and porter domain of MexB, we employed the 'eigenvector centrality' measure in the linear mutual information obtained from the protein correlation network. Notably, this study confirmed the presence of an allosteric transmembrane site in the MexB L protomer. In addition to this, Variant 1 emerged as a potent regulator of allosteric crosstalk, inducing an 'O-L intermediate state' in the MexB L protomer. This induced state might hold the potential to diminish substrate intake into the access pocket, leading to the ineffective efflux of antibiotics.
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Affiliation(s)
- Abhishek Bera
- Department of Chemistry & Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, Dhanbad-826004, India.
| | - Shreya Mukherjee
- Department of Chemistry & Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, Dhanbad-826004, India.
| | - Niladri Patra
- Department of Chemistry & Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, Dhanbad-826004, India.
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Mortada S, Karrouchi K, Hamza EH, Oulmidi A, Bhat MA, Mamad H, Aalilou Y, Radi S, Ansar M, Masrar A, Faouzi MEA. Synthesis, structural characterizations, in vitro biological evaluation and computational investigations of pyrazole derivatives as potential antidiabetic and antioxidant agents. Sci Rep 2024; 14:1312. [PMID: 38225280 PMCID: PMC10789823 DOI: 10.1038/s41598-024-51290-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 01/03/2024] [Indexed: 01/17/2024] Open
Abstract
In this study, a two pyrazole derivatives; 2-(5-methyl-1H-pyrazole-3-carbonyl)-N-phenylhydrazine-1-carboxamide (Pyz-1) and 4-amino-5-(5-methyl-1H-pyrazol-3-yl)-4H-1,2,4-triazole-3-thiol (Pyz-2) were synthesized and characterized by 13C-NMR, 1H-NMR, FT-IR, and mass spectrometry. A complete molecular structures optimization, electronic and thermodynamic properties of Pyz-1 and Pyz-2 in gas phase and aqueous solution were predicted by using hybrid B3LYP method with the 6-311++G** basis sets. Pyz-1 and Pyz-2 were evaluated in vitro for their anti-diabetic, antioxidant and xanthine oxidase inhibition activities. For anti-diabetic activity, Pyz-1 and Pyz-2 showed a potent α-glucosidase and α-amylase inhibition with IC50 values of 75.62 ± 0.56, 95.85 ± 0.92 and 119.3 ± 0.75, 120.2 ± 0.68 µM, respectively, compared to Acarbose (IC50(α-glucosidase) = 72.58 ± 0.68 µM, IC50(α-amylase) = 115.6 ± 0.574 µM). In xanthine oxidase assay, Pyz-1 and Pyz-2 exhibited remarkable inhibitory ability with IC50 values 24.32 ± 0.78 and 10.75 ± 0.54 µM, respectively. The result of antioxidant activities showed that the title compounds have considerable antioxidant and radical scavenger abilities. In addition, molecular docking simulation was used to determine the binding modes and energies between the title compounds and α-glucosidase and α-amylase enzymes.
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Affiliation(s)
- Salma Mortada
- Laboratory of Pharmacology and Toxicology, Biopharmaceutical and Toxicological Analysis Research Team, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - Khalid Karrouchi
- Laboratory of Analytical Chemistry and Bromatology, Team of Formulation and Quality Control of Health Products, Faculty of Medicine and Pharmacy, Mohammed V University in Rabat, Rabat, Morocco.
| | - El Hadki Hamza
- CERNE2D: Laboratory of Spectroscopy, Molecular Modelling, Materials, Nanomaterials, Water and Enviroment (LS3MN2E), Faculty of Sciences, Mohammed V University, Rabat, Morocco
| | - Afaf Oulmidi
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis (IMCN/MOST), Université Catholique de Louvain, 1348, Louvain-la-Neuve, Belgium
| | - Mashooq Ahamd Bhat
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, 11451, Riyadh, Saudi Arabia
| | - Hassane Mamad
- Central Laboratory of Hematology, Ibn Sina Hospital, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - Youssra Aalilou
- Laboratory of Pharmacology and Toxicology, Biopharmaceutical and Toxicological Analysis Research Team, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - Smaail Radi
- Laboratoire de Chimie Appliquée et Environnement (LCAE), Faculté des Sciences, Université Mohammed I, 60000, Oujda, Morocco
| | - M'hammed Ansar
- Laboratory of Medicinal Chemistry, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - Azlarab Masrar
- Central Laboratory of Hematology, Ibn Sina Hospital, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - My El Abbes Faouzi
- Laboratory of Pharmacology and Toxicology, Biopharmaceutical and Toxicological Analysis Research Team, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
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Ayaz M, Alam A, Zainab, Assad M, Javed A, Islam MS, Rafiq H, Ali M, Ahmad W, Khan A, Latif A, Al-Harrasi A, Ahmad M. Biooriented Synthesis of Ibuprofen-Clubbed Novel Bis-Schiff Base Derivatives as Potential Hits for Malignant Glioma: In Vitro Anticancer Activity and In Silico Approach. ACS OMEGA 2023; 8:49228-49243. [PMID: 38173864 PMCID: PMC10764114 DOI: 10.1021/acsomega.3c07216] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/18/2023] [Accepted: 12/04/2023] [Indexed: 01/05/2024]
Abstract
This research work is based on the synthesis of bis-Schiff base derivatives of the commercially available ibuprofen drug in outstanding yields through multistep reactions. Structures of the synthesized compounds were confirmed by the help of modern spectroscopic techniques including high-resolution electrospray ionization mass spectrometry (HR-ESI-MS), 1H NMR, and 13C NMR. The synthesized compounds were evaluated for their anticancer activity using a normal human embryonic kidney HEK293 cell and U87-malignant glioma (ATCC-HTB-14) as a cancer cell line. All of the synthesized compounds among the series exhibited excellent to less antiproliferative activity having IC50 values ranging from 5.75 ± 0.43 to 150.45 ± 0.20 μM. Among them, compound 5e (IC50 = 5.75 ± 0.43 μM) was found as the most potent antiprolifarative agent, while 5f, 5b, 5a, 5n, 5r, 5s, 5g, 5q, 5i, and 5j exhibited good activity with IC50 values from 24.17 ± 0.46 to 43.71 ± 0.07 μM. These findings suggest that these cells (HEK293) are less cytotoxic to the activities of compounds and increase the cancer cell death in brain, while the lower cytotoxicity of the potent compounds in noncancerous cells suggests that these derivatives will provide promising treatment for patients suffering from brain cancer. The results of the docking study exposed a promising affinity of the active compounds toward casein kinase-2 enzyme, which shows green signal for cancer treatment.
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Affiliation(s)
- Muhammad Ayaz
- Department
of Chemistry, University of Malakand, Dir Lower, Khyber Pakhtunkhwa 18800, Pakistan
| | - Aftab Alam
- Department
of Chemistry, University of Malakand, Dir Lower, Khyber Pakhtunkhwa 18800, Pakistan
| | - Zainab
- College
of Chemistry and Materials Science, Hebei
Normal University, Shijiazhuang 050024, China
| | - Mohammad Assad
- Department
of Biochemistry, Abdul Wali Khan University
Mardan, Khyber
Pakhtunkhwa 23200, Pakistan
| | - Aneela Javed
- Molecular
Immunology Laboratory, Department of Healthcare Biotechnology Atta-Ur-Rahman
School of Applied Biosciences, National
University of Sciences and Technology, H-12 Campus, Islamabad 44000, Pakistan
| | - Mohammad Shahidul Islam
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Huma Rafiq
- Molecular
Immunology Laboratory, Department of Healthcare Biotechnology Atta-Ur-Rahman
School of Applied Biosciences, National
University of Sciences and Technology, H-12 Campus, Islamabad 44000, Pakistan
| | - Mumtaz Ali
- Department
of Chemistry, University of Malakand, Dir Lower, Khyber Pakhtunkhwa 18800, Pakistan
| | - Waqar Ahmad
- Department
of Chemistry, University of Malakand, Dir Lower, Khyber Pakhtunkhwa 18800, Pakistan
| | - Ajmal Khan
- Natural and
Medical Sciences Research Center, University
of Nizwa, P.O. Box 33, Birkat Al Mauz, PC 616 Nizwa, Sultanate of Oman
| | - Abdul Latif
- Department
of Chemistry, University of Malakand, Dir Lower, Khyber Pakhtunkhwa 18800, Pakistan
| | - Ahmed Al-Harrasi
- Natural and
Medical Sciences Research Center, University
of Nizwa, P.O. Box 33, Birkat Al Mauz, PC 616 Nizwa, Sultanate of Oman
| | - Manzoor Ahmad
- Department
of Chemistry, University of Malakand, Dir Lower, Khyber Pakhtunkhwa 18800, Pakistan
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