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Identification of L. infantum trypanothione synthetase inhibitors with leishmanicidal activity from a (non-biased) in-house chemical library. Eur J Med Chem 2022; 243:114675. [DOI: 10.1016/j.ejmech.2022.114675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/05/2022] [Accepted: 08/08/2022] [Indexed: 11/21/2022]
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2
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Fermentative production of alternative antimicrobial peptides and enzymes. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2021. [DOI: 10.1016/j.bcab.2021.102189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Odusami JA, Ikhile MI, Izunobi JU, Olasupo IA, Osunsanmi FO, Opoku AR, Fotsing MCD, Asekun OT, Familoni OB, Ndinteh DT. Synthesis of substituted N-(2'-nitrophenyl)pyrrolidine-2-carboxamides towards the design of proline-rich antimicrobial peptide mimics to eliminate bacterial resistance to antibiotics. Bioorg Chem 2020; 105:104340. [PMID: 33096308 DOI: 10.1016/j.bioorg.2020.104340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 01/05/2023]
Abstract
The treatment of diseases is under threat due to the increasing resistance of disease-causing bacteria to antibiotics. Likewise, free radical-induced oxidative stress has been implicated in several human disease conditions, such as cancer, stroke and diabetes. In the search for amino acid analogues with antibacterial and antioxidant properties as possible mimics of antimicrobial peptides, substituted N-(2'-nitrophenyl)pyrrolidine-2-carboxamides 4a-4k and N-(2'-nitrophenyl)piperidine-2-carboxamides 4l-4n have been synthesized via a two-step, one-pot amidation of the corresponding acids, using thionyl chloride with different amines in dichloromethane. The carboxamides were characterized by infrared and nuclear magnetic resonance spectroscopy, mass spectrometry and elemental analysis. Carboxamides 4a-4n were assayed against five Gram-positive and five Gram-negative bacterial strains using the broth micro-dilution procedure and compared to standard antibiotic drugs (streptomycin and nalidixic acid). 4b showed the highest antibacterial activity with a minimum inhibitory concentration (MIC) value of 15.6 µg/mL against Staphylococcus aureus. Pertinently, 4b and 4k are promising candidates for narrow-spectrum (Gram-positive) and broad-spectrum antibiotics, respectively. The antioxidant properties of the carboxamides were also evaluated using the 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical cation. 4a and 4k recorded the lowest IC50 values of 1.22 × 10-3 mg/mL (with DPPH) and 1.45 × 10-4 mg/mL (with ABTS), respectively. Notably, 4k recorded about 2.5 times better antioxidant capacity than the positive controls - ascorbic acid and butylated hydroxyanisole. These results bode well for N-aryl carboxamides as good mimics and substitutes for antimicrobial peptides towards mitigating bacterial resistance to antibiotics as well as ameliorating oxidative stress-related diseases.
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Affiliation(s)
- Jocelyn A Odusami
- Department of Chemistry, University of Lagos, Akoka, Lagos, Nigeria; Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa; Department of Chemical Sciences, Yaba College of Technology, Yaba, Lagos, Nigeria
| | - Monisola I Ikhile
- Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa.
| | | | - Idris A Olasupo
- Department of Chemistry, University of Lagos, Akoka, Lagos, Nigeria
| | - Foluso O Osunsanmi
- Department of Biochemistry & Microbiology, University of Zululand, Kwadlangezwa, South Africa
| | - Andrew R Opoku
- Department of Biochemistry & Microbiology, University of Zululand, Kwadlangezwa, South Africa
| | - Marthe C D Fotsing
- Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa
| | | | | | - Derek T Ndinteh
- Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa
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Alkhalifa S, Jennings MC, Granata D, Klein M, Wuest WM, Minbiole KPC, Carnevale V. Analysis of the Destabilization of Bacterial Membranes by Quaternary Ammonium Compounds: A Combined Experimental and Computational Study. Chembiochem 2020; 21:1510-1516. [PMID: 31859426 PMCID: PMC7237276 DOI: 10.1002/cbic.201900698] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Indexed: 12/24/2022]
Abstract
The mechanism of action of quaternary ammonium compound (QAC) antiseptics has long been assumed to be straightforward membrane disruption, although the process of approaching and entering the membrane has little modeling precedent. Furthermore, questions have more recently arisen regarding bacterial resistance mechanisms, and why select classes of QACs (specifically, multicationic QACs) are less prone to resistance. In order to better understand such subtleties, a series of molecular dynamics simulations were utilized to help identify these molecular determinants, directly comparing mono-, bis-, and triscationic QACs in simulated membrane intercalation models. Three distinct membranes were simulated, mimicking the surfaces of Escherichia coli and Staphylococcus aureus, as well as a neutral phospholipid control. By analyzing the resulting trajectories in the form of a timeseries analysis, insight was gleaned regarding the significant steps and interactions involved in the destabilization of phospholipid bilayers within the bacterial membranes. Finally, to more specifically probe the effect of the hydrophobic section of the amphiphile that presumably penetrates the membrane, a series of alkyl- and ester-based biscationic quaternary ammonium compounds were prepared, tested for antimicrobial activity against both Gram-positive and Gram-negative bacteria, and modeled.
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Affiliation(s)
- Saleh Alkhalifa
- Department of Chemistry, Villanova University, 800 East Lancaster Avenue, Villanova, PA, 19085, USA
| | - Megan C Jennings
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA, 19122, USA
| | - Daniele Granata
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA, 19122, USA
| | - Michael Klein
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA, 19122, USA
| | - William M Wuest
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA, 30322, USA
- Emory Antibiotic Resistance Center, Emory University School of Medicine, 201 Dowman Drive, Atlanta, GA, 30322, USA
| | - Kevin P C Minbiole
- Department of Chemistry, Villanova University, 800 East Lancaster Avenue, Villanova, PA, 19085, USA
| | - Vincenzo Carnevale
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA, 19122, USA
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Reynisson J. Generation of Quality Hit Matter for Successful Drug Discovery Projects. Molecules 2019; 24:molecules24030381. [PMID: 30678174 PMCID: PMC6384824 DOI: 10.3390/molecules24030381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 01/18/2019] [Indexed: 11/26/2022] Open
Affiliation(s)
- Jóhannes Reynisson
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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Modeling of Structure-Property Relationships of Polymerizable Surfactants with Antimicrobial Activity. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8101972] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Polymerizable quaternary ammonium salts (PQASs) were synthesized in a previous work and some of them were used as surfactants in the antimicrobial coating of commercial membranes. Herein, the electrostatic charges, maximum length, and aspect ratio of these antibacterial surfactants were calculated with the aim of investigating the relationship between the properties, recognized to control the biocidal activity of these molecules, and the molecular structures. The effect of the water molecules was considered through a quantum and molecular mechanics approach. The correlation between the number of carbons in the main aliphatic chain of PQAS and the above properties was investigated, by finding that the net charge on the ammonium group does not increase as the number of carbons in the aliphatic chain increase. Thus, although this number influences the antibacterial activity of the surfactants, this influence is not correlated with an increase of the ammonium positive charge. Unlike the partial charges, a different trend was obtained for the surfactants’ maximum length and aspect ratio in agreement with the experimental behavior. As this modeling does not use empirical or adjustable parameters, it can assist the synthetic plan of new structures for surface functionalization, in order to improve the biofouling resistance of the membranes.
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