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Ahmed S, Bhat AR, Rahiman AK, Dongre RS, Hasan AH, Niranjan V, C L, Sheikh SA, Jamalis J, Berredjem M, Kawsar SMA. Green synthesis, antibacterial and antifungal evaluation of new thiazolidine-2,4-dione derivatives: molecular dynamic simulation, POM study and identification of antitumor pharmacophore sites. J Biomol Struct Dyn 2023:1-17. [PMID: 37768136 DOI: 10.1080/07391102.2023.2258404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023]
Abstract
In this study, a series of thiazolidine-2,4-dione derivatives 3a-i were synthesized and evaluated for antibacterial activity against Gram-positive and Gram-negative strains of Bacillus licheniformis, Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus. Newly prepared thiazolidine (TZD) derivatives were further screened separately for in vitro antifungal activity against cultures of fungal species, namely, Aspergillus niger, Alternaria brassicicola, Chaetomium murorum, Fusarium oxysporum, Lycopodium sp. and Penicillium notatum. The electron-donating substituents (-OH and -OCH3) and electron-withdrawing substituents (-Cl and -NO2) on the attached arylidene moieties of five-membered heterocyclic ring enhanced the broad spectrum of antimicrobial and antifungal activities. The molecular docking study has revealed that compound 3h strongly interacts with the catalytic residues of the active site of the β-carbonic anhydrase (P. aeruginosa) and has the best docking score. In silico pharmacokinetics studies showed the drug-likeness and non-toxic nature of the synthesized compounds, which indicates the combined antibacterial, antiviral and antitumor pharmacophore sites of the targeted drug. This work demonstrates that potential TZD derivatives bind to different types of bacterial and fungal pathogens for circumventing their activities and opens avenues for the development of newer drug candidates that can target bacterial and fungal pathogens.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Sumeer Ahmed
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), University of Madras, Chennai, India
| | - Ajmal R Bhat
- Department of Chemistry, RTM Nagpur University, Nagpur, India
| | - Aziz Kalilur Rahiman
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), University of Madras, Chennai, India
| | | | - Aso Hameed Hasan
- Department of Chemistry, College of Science, University of Garmian, Kalar, Iraq
| | - Vidya Niranjan
- Department of Biotechnology, R V College of Engineering, Bengaluru, India
| | - Lavanya C
- Department of Biotechnology, R V College of Engineering, Bengaluru, India
| | - S A Sheikh
- Department of Physics, National Institute of Technology, Srinagar, Kashmir, India
| | - Joazaizulfazli Jamalis
- Faculty of Science, Department of Chemistry, Universiti Teknologi Malaysia, Johor, Malaysia
| | - Malika Berredjem
- Laboratory of Applied Organic Chemistry LCOA, Synthesis of Biomolecules and Molecular Modelling Group, Badji-Mokhtar - Annaba University, Annaba, Algeria
| | - Sarkar M A Kawsar
- Laboratory of Carbohydrate and Nucleoside Chemistry (LCNC), Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong, Bangladesh
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2
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Suryawanshi MD, Suryawanshi GD, Mhaske PC, Karpe DG, Kamble KR, Rode SJ, Sudrik VA, Lawande SP. Design, Synthesis of 3-(5-Substituted Phenyl-[1,3,4]oxadiazol-2-yl)-1H-indole and Its Microbial Activity. Chem Biodivers 2023; 20:e202201017. [PMID: 36808804 DOI: 10.1002/cbdv.202201017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 01/03/2023] [Accepted: 02/10/2023] [Indexed: 02/21/2023]
Abstract
Fischer indole synthesis of indole by using phenyl-hydrazine and acetaldehyde resulted 1H-Indole while phenyl-hydrazine reacted with malonaldehyde gives 1H-Indole-3-carbaldehyde. Also Vilsmeier-Haack formylation of 1H-Indole gives 1H-Indole-3-carbaldehyde. 1H-Indole-3-carbaldehyde were oxidized to form 1H-Indole-3-carboxylic acid. 1H-Indole reacted with excess of BuLi at -78 °C using dry ice also gives 1H-Indole-3-carboxylic acid. Obtained 1H-Indole-3-carboxylic acid was converted to ester and ester in to acid hydrazide. Finally 1H-Indole-3-carboxylic acid hydrazide reacted with substituted carboxylic acid gives microbial active indole substituted oxadiazoles. Synthesized compounds 9a-j showing promising in vitro anti microbial activities against S. aureus bacteria compared with Streptomycin. Compound 9a, 9f and 9g showing activities against E. coli compared with standards. Compound 9a and 9f are found potent active against B. subtilis compared with reference standard while compound 9a, 9c and 9j active against S. typhi.
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Affiliation(s)
- Manohar D Suryawanshi
- Department of Chemistry, Shri Chhatrapati Shivaji Mahavidyalaya, 413701, Shrigonda, Ahmednagar (M. S.), India
| | - Ganesh D Suryawanshi
- Department of Chemistry, Dada Patil Mahavidyalaya, 414402, Karjat, Ahmednagar (M.S.), India
| | - Pravin C Mhaske
- Department of Chemistry, Sir Parshurambhau College, 411030, Pune (M.S.), India
| | - Dnyaneshwar G Karpe
- Department of Chemistry, Shri Chhatrapati Shivaji Mahavidyalaya, 413701, Shrigonda, Ahmednagar (M. S.), India
| | - Komal R Kamble
- Department of Chemistry, Shri Chhatrapati Shivaji Mahavidyalaya, 413701, Shrigonda, Ahmednagar (M. S.), India
| | - Sagar J Rode
- Department of Chemistry, Dada Patil Mahavidyalaya, 414402, Karjat, Ahmednagar (M.S.), India
| | - Vilas A Sudrik
- Department of Chemistry, Shri Chhatrapati Shivaji Mahavidyalaya, 413701, Shrigonda, Ahmednagar (M. S.), India
| | - Shamrao P Lawande
- Department of Chemistry, Shri Chhatrapati Shivaji Mahavidyalaya, 413701, Shrigonda, Ahmednagar (M. S.), India
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3
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Schultz JR, Costa SK, Jachak GR, Hegde P, Zimmerman M, Pan Y, Josten M, Ejeh C, Hammerstad T, Sahl HG, Pereira PM, Pinho MG, Dartois V, Cheung A, Aldrich CC. Identification of 5-(Aryl/Heteroaryl)amino-4-quinolones as Potent Membrane-Disrupting Agents to Combat Antibiotic-Resistant Gram-Positive Bacteria. J Med Chem 2022; 65:13910-13934. [PMID: 36219779 PMCID: PMC9826610 DOI: 10.1021/acs.jmedchem.2c01151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Nosocomial infections caused by resistant Gram-positive organisms are on the rise, presumably due to a combination of factors including prolonged hospital exposure, increased use of invasive procedures, and pervasive antibiotic therapy. Although antibiotic stewardship and infection control measures are helpful, newer agents against multidrug-resistant (MDR) Gram-positive bacteria are urgently needed. Here, we describe our efforts that led to the identification of 5-amino-4-quinolone 111 with exceptionally potent Gram-positive activity with minimum inhibitory concentrations (MICs) ≤0.06 μg/mL against numerous clinical isolates. Preliminary mechanism of action and resistance studies demonstrate that the 5-amino-4-quinolones are bacteriostatic, do not select for resistance, and selectively disrupt bacterial membranes. While the precise molecular mechanism has not been elucidated, the lead compound is nontoxic displaying a therapeutic index greater than 500, is devoid of hemolytic activity, and has attractive physicochemical properties (clog P = 3.8, molecular weight (MW) = 441) that warrant further investigation of this promising antibacterial scaffold for the treatment of Gram-positive infections.
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Affiliation(s)
- John R Schultz
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Stephen K Costa
- Department of Microbiology & Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, United States
| | - Gorakhnath R Jachak
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Pooja Hegde
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Matthew Zimmerman
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey 07110, United States
| | - Yan Pan
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey 07110, United States
| | - Michaele Josten
- Institute for Pharmaceutical Microbiology and Institute for Medical Microbiology, Immunology, and Parasitology, University of Bonn, D-53115 Bonn, Germany
| | - Chinedu Ejeh
- Department of Microbiology & Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, United States
| | - Travis Hammerstad
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Hans Georg Sahl
- Institute for Pharmaceutical Microbiology and Institute for Medical Microbiology, Immunology, and Parasitology, University of Bonn, D-53115 Bonn, Germany
| | - Pedro M Pereira
- Bacterial Cell Biology Laboratory, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avenida da República (EAN), 2781-901 Oeiras, Portugal
| | - Mariana G Pinho
- Bacterial Cell Biology Laboratory, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avenida da República (EAN), 2781-901 Oeiras, Portugal
| | - Véronique Dartois
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey 07110, United States
| | - Ambrose Cheung
- Department of Microbiology & Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, United States
| | - Courtney C Aldrich
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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Mulkern AJ, Oyama LB, Cookson AR, Creevey CJ, Wilkinson TJ, Olleik H, Maresca M, da Silva GC, Fontes PP, Bazzolli DMS, Mantovani HC, Damaris BF, Mur LAJ, Huws SA. Microbiome-derived antimicrobial peptides offer therapeutic solutions for the treatment of Pseudomonas aeruginosa infections. NPJ Biofilms Microbiomes 2022; 8:70. [PMID: 36038584 PMCID: PMC9424236 DOI: 10.1038/s41522-022-00332-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 08/05/2022] [Indexed: 11/17/2022] Open
Abstract
Microbiomes are rife for biotechnological exploitation, particularly the rumen microbiome, due to their complexicity and diversity. In this study, antimicrobial peptides (AMPs) from the rumen microbiome (Lynronne 1, 2, 3 and P15s) were assessed for their therapeutic potential against seven clinical strains of Pseudomonas aeruginosa. All AMPs exhibited antimicrobial activity against all strains, with minimum inhibitory concentrations (MICs) ranging from 4–512 µg/mL. Time-kill kinetics of all AMPs at 3× MIC values against strains PAO1 and LES431 showed complete kill within 10 min to 4 h, although P15s was not bactericidal against PAO1. All AMPs significantly inhibited biofilm formation by strains PAO1 and LES431, and induction of resistance assays showed no decrease in activity against these strains. AMP cytotoxicity against human lung cells was also minimal. In terms of mechanism of action, the AMPs showed affinity towards PAO1 and LES431 bacterial membrane lipids, efficiently permeabilising the P. aeruginosa membrane. Transcriptome and metabolome analysis revealed increased catalytic activity at the cell membrane and promotion of β-oxidation of fatty acids. Finally, tests performed with the Galleria mellonella infection model showed that Lynronne 1 and 2 were efficacious in vivo, with a 100% survival rate following treatment at 32 mg/kg and 128 mg/kg, respectively. This study illustrates the therapeutic potential of microbiome-derived AMPs against P. aeruginosa infections.
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Affiliation(s)
- Adam J Mulkern
- IBERS, Aberystwyth University, Aberystwyth, SY23 3DA, Wales, UK. .,TWINCORE, Centre for Experimental and Clinical Infection Research, a Joint Venture between the Medical School Hannover (MHH) and the Helmholtz Centre for Infection Research (HZI), Hannover, Germany.
| | - Linda B Oyama
- Institute for Global Food Security, 19 Chlorine Gardens, Queen's University of Belfast, Belfast, Northern Ireland, BT9 5DP, UK
| | - Alan R Cookson
- IBERS, Aberystwyth University, Aberystwyth, SY23 3DA, Wales, UK
| | - Christopher J Creevey
- Institute for Global Food Security, 19 Chlorine Gardens, Queen's University of Belfast, Belfast, Northern Ireland, BT9 5DP, UK
| | - Toby J Wilkinson
- IBERS, Aberystwyth University, Aberystwyth, SY23 3DA, Wales, UK.,The Roslin Institute and R(D)SVS, University of Edinburgh, Easter Bush, Roslin, Edinburgh, EH25 9RG, UK
| | - Hamza Olleik
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
| | - Marc Maresca
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
| | - Giarla C da Silva
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Patricia P Fontes
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Denise M S Bazzolli
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Hilario C Mantovani
- Departamento de Microbiologia, Universidade Federal de Viçosa, Viçosa, 36570-900, Brazil
| | - Bamu F Damaris
- TWINCORE, Centre for Experimental and Clinical Infection Research, a Joint Venture between the Medical School Hannover (MHH) and the Helmholtz Centre for Infection Research (HZI), Hannover, Germany
| | - Luis A J Mur
- IBERS, Aberystwyth University, Aberystwyth, SY23 3DA, Wales, UK
| | - Sharon A Huws
- Institute for Global Food Security, 19 Chlorine Gardens, Queen's University of Belfast, Belfast, Northern Ireland, BT9 5DP, UK.
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Bhakhar KA, Sureja DK, Dhameliya TM. Synthetic account of indoles in search of potential anti-mycobacterial agents: A review and future insights. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131522] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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6
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Tang Q, Yang C, Li W, Zhang Y, Wang X, Wang W, Ma Z, Zhang D, Jin Y, Lin D. Evaluation of Short-Chain Antimicrobial Peptides With Combined Antimicrobial and Anti-inflammatory Bioactivities for the Treatment of Zoonotic Skin Pathogens From Canines. Front Microbiol 2021; 12:684650. [PMID: 34456884 PMCID: PMC8386128 DOI: 10.3389/fmicb.2021.684650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 07/16/2021] [Indexed: 11/17/2022] Open
Abstract
The incidence of zoonotic Staphylococcus pseudintermedius and Microsporum canis infections is rapidly growing worldwide in the context of an increasing frequency of close contact between animals and humans, presenting challenges in both human and veterinary medicine. Moreover, the development of microbial resistance and emergence of recalcitrant biofilms, accompanied by the insufficiency of new antimicrobial agents, have become major obstacles in treating superficial skin infections caused by various microbes including S. pseudintermedius and M. canis. Over recent years, the prospects of antimicrobial peptides as emerging antimicrobials to combat microbial infections have been demonstrated. In our study, two novel short-chain peptides, namely, allomyrinasin and andricin B, produced by Allomyrina dichotoma and Andrias davidianus, were revealed to exhibit potent antimicrobial efficacy against clinical isolates of S. pseudintermedius and M. canis with remarkable and rapid fungicidal and bactericidal effects, while allomyrinasin exhibited inhibition of biofilm formation and eradication of mature biofilm. These peptides displayed synergistic activity when combined with amoxicillin and terbinafine against S. pseudintermedius and M. canis. Cytoplasmic leakage via cytomembrane permeabilization serves as a mechanism of action. Extremely low hemolytic activity and serum stability in vitro, as well as superior anti-infective efficacy in reducing bacterial counts and relieving the inflammatory response in vivo, were detected. The potent antibacterial, antifungal, and anti-inflammatory activities of allomyrinasin and andricin B might indicate promising anti-infective alternatives for the treatment of S. pseudintermedius and M. canis infections in the context of human and veterinary medicine.
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Affiliation(s)
- Qiyu Tang
- Department of Veterinary Clinical Science, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Chunyi Yang
- Department of Veterinary Clinical Science, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Weitian Li
- Laboratory of Anatomy of Domestic Animals, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Yuhang Zhang
- Key Lab of Animal Epidemiology and Zoonosis of Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Xinying Wang
- Modern Animal Research Center, Nanjing University, Nanjing, China
| | - Weixin Wang
- Department of Veterinary Clinical Science, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Zhiling Ma
- Research and Development Department, Artron BioResearch Inc., Vancouver, BC, Canada
| | - Di Zhang
- Department of Veterinary Clinical Science, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Yipeng Jin
- Department of Veterinary Clinical Science, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Degui Lin
- Department of Veterinary Clinical Science, College of Veterinary Medicine, China Agricultural University, Beijing, China
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7
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Onime LA, Oyama LB, Thomas BJ, Gani J, Alexander P, Waddams KE, Cookson A, Fernandez-Fuentes N, Creevey CJ, Huws SA. The rumen eukaryotome is a source of novel antimicrobial peptides with therapeutic potential. BMC Microbiol 2021; 21:105. [PMID: 33832427 PMCID: PMC8034185 DOI: 10.1186/s12866-021-02172-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 03/25/2021] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The rise of microbial antibiotic resistance is a leading threat to the health of the human population. As such, finding new approaches to tackle these microbes, including development of novel antibiotics is vital. RESULTS In this study, we mined a rumen eukaryotic metatranscriptomic library for novel Antimicrobial peptides (AMPs) using computational approaches and thereafter characterised the therapeutic potential of the AMPs. We identified a total of 208 potentially novel AMPs from the ruminal eukaryotome, and characterised one of those, namely Lubelisin. Lubelisin (GIVAWFWRLAR) is an α-helical peptide, 11 amino acid long with theoretical molecular weight of 1373.76 D. In the presence of Lubelisin, strains of methicillin-resistant Staphylococcus aureus (MRSA) USA300 and EMRSA-15 were killed within 30 min of exposure with ≥103 and 104 CFU/mL reduction in viable cells respectively. Cytotoxicity of Lubelisin against both human and sheep erythrocytes was low resulting in a therapeutic index of 0.43. Membrane permeabilisation assays using propidium iodide alongside transmission electron microscopy revealed that cytoplasmic membrane damage may contribute to the antimicrobial activities of Lubelisin. CONCLUSIONS We demonstrate that the rumen eukaryotome is a viable source for the discovery of antimicrobial molecules for the treatment of bacterial infections and further development of these may provide part of the potential solution to the ongoing problem of antimicrobial resistance. The role of these AMPs in the ecological warfare within the rumen is also currently unknown.
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Affiliation(s)
- Lucy A Onime
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA, UK
| | - Linda B Oyama
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, Northern Ireland, BT9 5DL, UK
| | - Benjamin J Thomas
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA, UK
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, Northern Ireland, BT9 5DL, UK
| | - Jurnorain Gani
- Institute of Infection and Immunity, St. George's University of London, Cranmer Terrace, London, SW17 0RE, UK
| | - Peter Alexander
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, Northern Ireland, BT9 5DL, UK
| | - Kate E Waddams
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA, UK
| | - Alan Cookson
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA, UK
| | - Narcis Fernandez-Fuentes
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA, UK
| | - Christopher J Creevey
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, Northern Ireland, BT9 5DL, UK
| | - Sharon A Huws
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, Northern Ireland, BT9 5DL, UK.
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Padilla-Montaño N, de León Guerra L, Moujir L. Antimicrobial Activity and Mode of Action of Celastrol, a Nortriterpen Quinone Isolated from Natural Sources. Foods 2021; 10:foods10030591. [PMID: 33799720 PMCID: PMC7998816 DOI: 10.3390/foods10030591] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 03/05/2021] [Accepted: 03/05/2021] [Indexed: 01/07/2023] Open
Abstract
Species of the Celastraceae family are traditionally consumed in different world regions for their stimulating properties. Celastrol, a triterpene methylene quinone isolated from plants of celastraceas, specifically activates satiety centers in the brain that play an important role in controlling body weight. In this work, the antimicrobial activity and mechanism of action of celastrol and a natural derivative, pristimerin, were investigated in Bacillus subtilis. Celastrol showed a higher antimicrobial activity compared with pristimerin, being active against Gram-positive bacteria with minimum inhibitory concentrations (MICs) that ranged between 0.16 and 2.5 µg/mL. Killing curves displayed a bactericidal effect that was dependent on the inoculum size. Monitoring of macromolecular synthesis in bacterial populations treated with these compounds revealed inhibition in the incorporation of all radiolabeled precursors, but not simultaneously. Celastrol at 3 µg/mL and pristimerin at 10 µg/mL affected DNA and RNA synthesis first, followed by protein synthesis, although the inhibitory action on the uptake of radiolabeled precursors was more dramatic with celastrol. This compound also caused cytoplasmic membrane disruption observed by potassium leakage and formation of mesosome-like structures. The inhibition of oxygen consumption of whole and disrupted cells after treatments with both quinones indicates damage in the cellular structure, suggesting the cytoplasmic membrane as a potential target. These findings indicate that celastrol could be considered as an interesting alternative to control outbreaks caused by spore-forming bacteria.
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9
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Olleik H, Baydoun E, Perrier J, Hijazi A, Raymond J, Manzoni M, Dupuis L, Pauleau G, Goudard Y, Villéon BDL, Goin G, Sockeel P, Choudhary MI, Pasquale ED, Nadeem-Ul-Haque M, Ali H, Khan AI, Shaheen F, Maresca M. Temporin-SHa and Its Analogs as Potential Candidates for the Treatment of Helicobacter pylori. Biomolecules 2019; 9:biom9100598. [PMID: 31614561 PMCID: PMC6843786 DOI: 10.3390/biom9100598] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 09/27/2019] [Accepted: 10/03/2019] [Indexed: 12/11/2022] Open
Abstract
Helicobacter pylori is one of the most prevalent pathogens colonizing 50% of the world's population and causing gastritis and gastric cancer. Even with triple and quadruple antibiotic therapies, H. pylori shows increased prevalence of resistance to conventional antibiotics and treatment failure. Due to their pore-forming activity, antimicrobial peptides (AMP) are considered as a good alternative to conventional antibiotics, particularly in the case of resistant bacteria. In this study, temporin-SHa (a frog AMP) and its analogs obtained by Gly to Ala substitutions were tested against H. pylori. Results showed differences in the antibacterial activity and toxicity of the peptides in relation to the number and position of D-Ala substitution. Temporin-SHa and its analog NST1 were identified as the best molecules, both peptides being active on clinical resistant strains, killing 90-100% of bacteria in less than 1 h and showing low to no toxicity against human gastric cells and tissue. Importantly, the presence of gastric mucins did not prevent the antibacterial effect of temporin-SHa and NST1, NST1 being in addition resistant to pepsin. Taken together, our results demonstrated that temporin-SHa and its analog NST1 could be considered as potential candidates to treat H. pylori, particularly in the case of resistant strains.
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Affiliation(s)
- Hamza Olleik
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France.
- Department of Biology, American University of Beirut, Beirut-1107 2020, Lebanon.
| | - Elias Baydoun
- Department of Biology, American University of Beirut, Beirut-1107 2020, Lebanon
| | - Josette Perrier
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France
| | - Akram Hijazi
- Doctoral School of Science and Technology, Research Platform for Environmental Science (PRASE), Lebanese University, Beirut 5, Lebanon
| | - Josette Raymond
- Université Paris 5, Hôpital Cochin, Service de bactériologie, 75014 Paris, France
| | - Marine Manzoni
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France
| | - Lucas Dupuis
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France
| | - Ghislain Pauleau
- Departement of Digestive, Endocrine and Metabolic Surgery, Hôpital Laveran, Military Health Service, 13013 Marseille, France
| | - Yvain Goudard
- Departement of Digestive, Endocrine and Metabolic Surgery, Hôpital Laveran, Military Health Service, 13013 Marseille, France
| | - Bruno de La Villéon
- Departement of Digestive, Endocrine and Metabolic Surgery, Hôpital Laveran, Military Health Service, 13013 Marseille, France
| | - Géraldine Goin
- Departement of Digestive, Endocrine and Metabolic Surgery, Hôpital Laveran, Military Health Service, 13013 Marseille, France
| | - Philippe Sockeel
- Departement of Digestive, Endocrine and Metabolic Surgery, Hôpital Laveran, Military Health Service, 13013 Marseille, France
| | - Muhammad Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Eric Di Pasquale
- Aix-Marseille Univ, CNRS, INP, Inst Neurophysiopathol, 13005 Marseille, France
| | - Muhammad Nadeem-Ul-Haque
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Hunain Ali
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Arif Iftikhar Khan
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Farzana Shaheen
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Marc Maresca
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France.
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An insight into the medicinal perspective of synthetic analogs of indole: A review. Eur J Med Chem 2019; 180:562-612. [PMID: 31344615 DOI: 10.1016/j.ejmech.2019.07.019] [Citation(s) in RCA: 170] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/23/2019] [Accepted: 07/06/2019] [Indexed: 01/06/2023]
Abstract
Heterocycles occupy a salient place in chemistry due to their wide range of activity in the fields of drug design, photochemistry, agrochemicals, dyes, and so on. Amongst all, indole scaffold is considered as one of the most promising heterocycles found in natural and synthetic sources and has been shown to possess various biological activity, including anti-inflammatory, anti-HIV, antitubercular, antimalarial, anticonvulsant, antidiabetic, antihypertensive, analgesics, antidepressant, anticancer, antioxidant, antifungal, and antimicrobial, etc. All the reported indole molecules bind to multiple receptors with high affinity, thus expedite the research on the development of novel biologically active compounds through the various approach. In this review, we aimed to highlight synthetic and medicinal perspective on the development of indole-based analogs. In addition, structural activity relationship (SAR) study to correlate for their biological activity also discussed.
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Moorthy P, Ekambaram SP, Perumal SS. Synthesis, characterization and antimicrobial evaluation of imidazolyl thiazolidinedione derivatives. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2014.08.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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12
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Oyama LB, Girdwood SE, Cookson AR, Fernandez-Fuentes N, Privé F, Vallin HE, Wilkinson TJ, Golyshin PN, Golyshina OV, Mikut R, Hilpert K, Richards J, Wootton M, Edwards JE, Maresca M, Perrier J, Lundy FT, Luo Y, Zhou M, Hess M, Mantovani HC, Creevey CJ, Huws SA. The rumen microbiome: an underexplored resource for novel antimicrobial discovery. NPJ Biofilms Microbiomes 2017; 3:33. [PMID: 29214045 PMCID: PMC5711939 DOI: 10.1038/s41522-017-0042-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 10/04/2017] [Accepted: 11/06/2017] [Indexed: 12/27/2022] Open
Abstract
Antimicrobial peptides (AMPs) are promising drug candidates to target multi-drug resistant bacteria. The rumen microbiome presents an underexplored resource for the discovery of novel microbial enzymes and metabolites, including AMPs. Using functional screening and computational approaches, we identified 181 potentially novel AMPs from a rumen bacterial metagenome. Here, we show that three of the selected AMPs (Lynronne-1, Lynronne-2 and Lynronne-3) were effective against numerous bacterial pathogens, including methicillin-resistant Staphylococcus aureus (MRSA). No decrease in MRSA susceptibility was observed after 25 days of sub-lethal exposure to these AMPs. The AMPs bound preferentially to bacterial membrane lipids and induced membrane permeability leading to cytoplasmic leakage. Topical administration of Lynronne-1 (10% w/v) to a mouse model of MRSA wound infection elicited a significant reduction in bacterial counts, which was comparable to treatment with 2% mupirocin ointment. Our findings indicate that the rumen microbiome may provide viable alternative antimicrobials for future therapeutic application. Anti-microbial molecules made by microbes in the gut of ruminant animals could become new weapons against antibiotic-resistant infections. An international team of researchers led by Sharon Huws at Queen’s University Belfast, UK, identified three anti-microbial peptides in the rumen of animals such as cattle, sheep and goats. The peptides—short proteins—were highly active in laboratory trials against several clinically important drug-resistant infections. These included methicillin resistant Staphylococcus aureus (MRSA), a notorious cause of life-threatening infections, especially in patients with weakened immunity. There is growing interest in using peptides as alternatives to existing antibiotics. The findings, initiated by examining a ‘library’ of molecular data, suggest that the rumen is an under-explored resource that may harbor many medically useful antimicrobials. The possibilities should be investigated further, with promising molecules being tested in clinical conditions.
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Affiliation(s)
- Linda B Oyama
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Susan E Girdwood
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Alan R Cookson
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Narcis Fernandez-Fuentes
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Florence Privé
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Hannah E Vallin
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Toby J Wilkinson
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | | | | | - Ralf Mikut
- Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein, Leopoldshafen, Germany
| | - Kai Hilpert
- Institute of Infection and Immunity, St. George's University of London, Cranmer Terrace, London, SW17 0RE UK
| | - Jennifer Richards
- Specialist Antimicrobial Chemotherapy Unit, Public Health Wales, University Hospital of Wales, Heath Park, Cardiff, CF14 4XW UK
| | - Mandy Wootton
- Specialist Antimicrobial Chemotherapy Unit, Public Health Wales, University Hospital of Wales, Heath Park, Cardiff, CF14 4XW UK
| | - Joan E Edwards
- Wageningen University & Research, 6708 WE, Wageningen, Netherlands
| | - Marc Maresca
- Aix Marseille Université, CNRS, Central Marseille, iSm2, Marseille, France
| | - Josette Perrier
- Aix Marseille Université, CNRS, Central Marseille, iSm2, Marseille, France
| | - Fionnuala T Lundy
- Centre for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, Northern Ireland, BT9 7BL UK
| | - Yu Luo
- Centre for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, Northern Ireland, BT9 7BL UK
| | - Mei Zhou
- School of Pharmacy, Queens's University Belfast, Belfast, BT9 7BL, Northern Ireland, UK
| | - Matthias Hess
- UC Davis, College of Agricultural and Environmental Sciences, California, 95616 USA
| | - Hilario C Mantovani
- Department of Microbiology, Universidade Federal de Viçosa, Viçosa, 36570-900 Brazil
| | - Christopher J Creevey
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Sharon A Huws
- Institute for Global Food Security, School of Biological Sciences, Medical Biology Centre, Queen's University Belfast, 97 Lisburn Road, Belfast, Northern Ireland, BT9 7BL UK
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13
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Comparing the action of HT61 and chlorhexidine on natural and model Staphylococcus aureus membranes. J Antibiot (Tokyo) 2017; 70:1020-1025. [DOI: 10.1038/ja.2017.90] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/14/2017] [Accepted: 07/02/2017] [Indexed: 11/09/2022]
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Repurposing Toremifene for Treatment of Oral Bacterial Infections. Antimicrob Agents Chemother 2017; 61:AAC.01846-16. [PMID: 27993858 DOI: 10.1128/aac.01846-16] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 12/11/2016] [Indexed: 12/24/2022] Open
Abstract
The spread of antibiotic resistance and the challenges associated with antiseptics such as chlorhexidine have necessitated a search for new antibacterial agents against oral bacterial pathogens. As a result of failing traditional approaches, drug repurposing has emerged as a novel paradigm to find new antibacterial agents. In this study, we examined the effects of the FDA-approved anticancer agent toremifene against the oral bacteria Porphyromonas gingivalis and Streptococcus mutans We found that the drug was able to inhibit the growth of both pathogens, as well as prevent biofilm formation, at concentrations ranging from 12.5 to 25 μM. Moreover, toremifene was shown to eradicate preformed biofilms at concentrations ranging from 25 to 50 μM. In addition, we found that toremifene prevents P. gingivalis and S. mutans biofilm formation on titanium surfaces. A time-kill study indicated that toremifene is bactericidal against S. mutans Macromolecular synthesis assays revealed that treatment with toremifene does not cause preferential inhibition of DNA, RNA, or protein synthesis pathways, indicating membrane-damaging activity. Biophysical studies using fluorescent probes and fluorescence microscopy further confirmed the membrane-damaging mode of action. Taken together, our results suggest that the anticancer agent toremifene is a suitable candidate for further investigation for the development of new treatment strategies for oral bacterial infections.
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15
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Cushnie TPT, O'Driscoll NH, Lamb AJ. Morphological and ultrastructural changes in bacterial cells as an indicator of antibacterial mechanism of action. Cell Mol Life Sci 2016; 73:4471-4492. [PMID: 27392605 PMCID: PMC11108400 DOI: 10.1007/s00018-016-2302-2] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Revised: 06/21/2016] [Accepted: 06/28/2016] [Indexed: 01/20/2023]
Abstract
Efforts to reduce the global burden of bacterial disease and contend with escalating bacterial resistance are spurring innovation in antibacterial drug and biocide development and related technologies such as photodynamic therapy and photochemical disinfection. Elucidation of the mechanism of action of these new agents and processes can greatly facilitate their development, but it is a complex endeavour. One strategy that has been popular for many years, and which is garnering increasing interest due to recent technological advances in microscopy and a deeper understanding of the molecular events involved, is the examination of treated bacteria for changes to their morphology and ultrastructure. In this review, we take a critical look at this approach. Variables affecting antibacterial-induced alterations are discussed first. These include characteristics of the test organism (e.g. cell wall structure) and incubation conditions (e.g. growth medium osmolarity). The main body of the review then describes the different alterations that can occur. Micrographs depicting these alterations are presented, together with information on agents that induce the change, and the sequence of molecular events that lead to the change. We close by highlighting those morphological and ultrastructural changes which are consistently induced by agents sharing the same mechanism (e.g. spheroplast formation by peptidoglycan synthesis inhibitors) and explaining how changes that are induced by multiple antibacterial classes (e.g. filamentation by DNA synthesis inhibitors, FtsZ disruptors, and other types of agent) can still yield useful mechanistic information. Lastly, recommendations are made regarding future study design and execution.
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Affiliation(s)
- T P Tim Cushnie
- Faculty of Medicine, Mahasarakham University, Khamriang, Kantarawichai, Maha Sarakham, 44150, Thailand.
| | - Noëlle H O'Driscoll
- School of Pharmacy and Life Sciences, Robert Gordon University, Sir Ian Wood Building, Garthdee Road, Aberdeen, AB10 7GJ, UK
| | - Andrew J Lamb
- School of Pharmacy and Life Sciences, Robert Gordon University, Sir Ian Wood Building, Garthdee Road, Aberdeen, AB10 7GJ, UK
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Thøgersen MS, Delpin MW, Melchiorsen J, Kilstrup M, Månsson M, Bunk B, Spröer C, Overmann J, Nielsen KF, Gram L. Production of the Bioactive Compounds Violacein and Indolmycin Is Conditional in a maeA Mutant of Pseudoalteromonas luteoviolacea S4054 Lacking the Malic Enzyme. Front Microbiol 2016; 7:1461. [PMID: 27695447 PMCID: PMC5025454 DOI: 10.3389/fmicb.2016.01461] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 09/01/2016] [Indexed: 11/25/2022] Open
Abstract
It has previously been reported that some strains of the marine bacterium Pseudoalteromonas luteoviolacea produce the purple bioactive pigment violacein as well as the antibiotic compound indolmycin, hitherto only found in Streptomyces. The purpose of the present study was to determine the relative role of each of these two compounds as antibacterial compounds in P. luteoviolacea S4054. Using Tn10 transposon mutagenesis, a mutant strain that was significantly reduced in violacein production in mannose-containing substrates was created. Full genome analyses revealed that the vio-biosynthetic gene cluster was not interrupted by the transposon; instead the insertion was located to the maeA gene encoding the malic enzyme. Supernatant of the mutant strain inhibited Vibrio anguillarum and Staphylococcus aureus in well diffusion assays and in MIC assays at the same level as the wild type strain. The mutant strain killed V. anguillarum in co-culture experiments as efficiently as the wild type. Using UHPLC-UV/Vis analyses, we quantified violacein and indolmycin, and the mutant strain only produced 7-10% the amount of violacein compared to the wild type strain. In contrast, the amount of indolmycin produced by the mutant strain was about 300% that of the wild type. Since inhibition of V. anguillarum and S. aureus by the mutant strain was similar to that of the wild type, it is concluded that violacein is not the major antibacterial compound in P. luteoviolacea. We furthermore propose that production of violacein and indolmycin may be metabolically linked and that yet unidentified antibacterial compound(s) may be play a role in the antibacterial activity of P. luteoviolacea.
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Affiliation(s)
- Mariane S. Thøgersen
- Department of Biotechnology and Biomedicine, Technical University of Denmark Kongens Lyngby, Denmark
| | - Marina W. Delpin
- Department of Biotechnology and Biomedicine, Technical University of Denmark Kongens Lyngby, Denmark
| | - Jette Melchiorsen
- Department of Biotechnology and Biomedicine, Technical University of Denmark Kongens Lyngby, Denmark
| | - Mogens Kilstrup
- Department of Biotechnology and Biomedicine, Technical University of Denmark Kongens Lyngby, Denmark
| | - Maria Månsson
- Department of Biotechnology and Biomedicine, Technical University of Denmark Kongens Lyngby, Denmark
| | - Boyke Bunk
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ–German Collection of Microorganisms and Cell Cultures – Partner Site Hannover-Braunschweig, German Centre for Infection ResearchBraunschweig, Germany
| | - Cathrin Spröer
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ–German Collection of Microorganisms and Cell Cultures – Partner Site Hannover-Braunschweig, German Centre for Infection ResearchBraunschweig, Germany
| | - Jörg Overmann
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ–German Collection of Microorganisms and Cell Cultures – Partner Site Hannover-Braunschweig, German Centre for Infection ResearchBraunschweig, Germany
| | - Kristian F. Nielsen
- Department of Biotechnology and Biomedicine, Technical University of Denmark Kongens Lyngby, Denmark
| | - Lone Gram
- Department of Biotechnology and Biomedicine, Technical University of Denmark Kongens Lyngby, Denmark
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17
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Wang CM, Jhan YL, Tsai SJ, Chou CH. The Pleiotropic Antibacterial Mechanisms of Ursolic Acid against Methicillin-Resistant Staphylococcus aureus (MRSA). Molecules 2016; 21:E884. [PMID: 27399657 PMCID: PMC6273082 DOI: 10.3390/molecules21070884] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 06/23/2016] [Accepted: 06/30/2016] [Indexed: 01/20/2023] Open
Abstract
(1) BACKGROUND: Several triterpenoids were found to act synergistically with classes of antibiotic, indicating that plant-derived chemicals have potential to be used as therapeutics to enhance the activity of antibiotics against multidrug-resistant pathogens. However, the mode of action of triterpenoids against bacterial pathogens remains unclear. The objective of this study is to evaluate the interaction between ursolic acid against methicillin-resistant Staphylococcus aureus (MRSA); (2) METHODS: The ability of ursolic acid to damage mammalian and bacterial membranes was examined. The proteomic response of methicillin-resistant S. aureus in ursolic acid treatment was investigated using two-dimensional (2D) proteomic analysis; (3) RESULTS: Ursolic acid caused the loss of staphylococcal membrane integrity without hemolytic activity. The comparison of the protein pattern of ursolic acid-treated and normal MRSA cells revealed that ursolic acid affected a variety of proteins involved in the translation process with translational accuracy, ribonuclease and chaperon subunits, glycolysis and oxidative responses; (4) CONCLUSION: The mode of action of ursolic acid appears to be the influence on the integrity of the bacterial membrane initially, followed by inhibition of protein synthesis and the metabolic pathway. These findings reflect that the pleiotropic effects of ursolic acid against MRSA make it a promising antibacterial agent in pharmaceutical research.
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Affiliation(s)
- Chao-Min Wang
- Research Center for Biodiversity, China Medical University, Taichung 40402, Taiwan.
| | - Yun-Lian Jhan
- Research Center for Biodiversity, China Medical University, Taichung 40402, Taiwan.
| | - Shang-Jie Tsai
- Research Center for Biodiversity, China Medical University, Taichung 40402, Taiwan.
| | - Chang-Hung Chou
- Research Center for Biodiversity, China Medical University, Taichung 40402, Taiwan.
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18
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Gerits E, Blommaert E, Lippell A, O’Neill AJ, Weytjens B, De Maeyer D, Fierro AC, Marchal K, Marchand A, Chaltin P, Spincemaille P, De Brucker K, Thevissen K, Cammue BPA, Swings T, Liebens V, Fauvart M, Verstraeten N, Michiels J. Elucidation of the Mode of Action of a New Antibacterial Compound Active against Staphylococcus aureus and Pseudomonas aeruginosa. PLoS One 2016; 11:e0155139. [PMID: 27167126 PMCID: PMC4864301 DOI: 10.1371/journal.pone.0155139] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 04/25/2016] [Indexed: 01/29/2023] Open
Abstract
Nosocomial and community-acquired infections caused by multidrug resistant bacteria represent a major human health problem. Thus, there is an urgent need for the development of antibiotics with new modes of action. In this study, we investigated the antibacterial characteristics and mode of action of a new antimicrobial compound, SPI031 (N-alkylated 3, 6-dihalogenocarbazol 1-(sec-butylamino)-3-(3,6-dichloro-9H-carbazol-9-yl)propan-2-ol), which was previously identified in our group. This compound exhibits broad-spectrum antibacterial activity, including activity against the human pathogens Staphylococcus aureus and Pseudomonas aeruginosa. We found that SPI031 has rapid bactericidal activity (7-log reduction within 30 min at 4x MIC) and that the frequency of resistance development against SPI031 is low. To elucidate the mode of action of SPI031, we performed a macromolecular synthesis assay, which showed that SPI031 causes non-specific inhibition of macromolecular biosynthesis pathways. Liposome leakage and membrane permeability studies revealed that SPI031 rapidly exerts membrane damage, which is likely the primary cause of its antibacterial activity. These findings were supported by a mutational analysis of SPI031-resistant mutants, a transcriptome analysis and the identification of transposon mutants with altered sensitivity to the compound. In conclusion, our results show that SPI031 exerts its antimicrobial activity by causing membrane damage, making it an interesting starting point for the development of new antibacterial therapies.
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Affiliation(s)
- Evelien Gerits
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Eline Blommaert
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Anna Lippell
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Alex J. O’Neill
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Bram Weytjens
- Department of Information Technology (INTEC, iMINDS), U.Ghent, Ghent, Belgium
| | - Dries De Maeyer
- Department of Information Technology (INTEC, iMINDS), U.Ghent, Ghent, Belgium
| | - Ana Carolina Fierro
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
- Department of Information Technology (INTEC, iMINDS), U.Ghent, Ghent, Belgium
| | - Kathleen Marchal
- Department of Information Technology (INTEC, iMINDS), U.Ghent, Ghent, Belgium
- Department of Plant Biotechnology and Bioinformatics, U.Ghent, Ghent, Belgium
| | - Arnaud Marchand
- CISTIM Leuven vzw, Bio-Incubator, KU Leuven, Leuven, Belgium
| | - Patrick Chaltin
- CISTIM Leuven vzw, Bio-Incubator, KU Leuven, Leuven, Belgium
- Centre for Drug Design and Discovery (CD3), Research and Development, KU Leuven, Leuven, Belgium
| | - Pieter Spincemaille
- Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | | | - Karin Thevissen
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Bruno P. A. Cammue
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
- Department of Plant Systems Biology, VIB, Ghent, Belgium
| | - Toon Swings
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Veerle Liebens
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Maarten Fauvart
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
- imec, Smart Systems and Emerging Technologies Unit, Department of Life Science Technologies, Leuven, Belgium
| | | | - Jan Michiels
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
- * E-mail:
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Syntheses of 4-Indolylquinoline Derivatives via Reductive Cyclization of Indolylnitrochalcone Derivatives by Fe/HCl. Molecules 2015; 20:22499-519. [PMID: 26694335 PMCID: PMC6332431 DOI: 10.3390/molecules201219862] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 12/07/2015] [Accepted: 12/08/2015] [Indexed: 11/29/2022] Open
Abstract
An easy and efficient procedure for the synthesis of 4-indolylquinoline derivatives is described. This process involves two steps, the first of which is the Michael addition of indole to nitrochalcones promoted by sulfamic acid under solvent free conditions and the second step is a reductive cyclization of the indolylnitrochalcone intermediates to 4-indolylquinoline derivatives by Fe/HCl in ethanol. In both steps, the reactions are clean and the yields of products are high.
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Mohammad H, Reddy PVN, Monteleone D, Mayhoub AS, Cushman M, Hammac GK, Seleem MN. Antibacterial Characterization of Novel Synthetic Thiazole Compounds against Methicillin-Resistant Staphylococcus pseudintermedius. PLoS One 2015; 10:e0130385. [PMID: 26086336 PMCID: PMC4472782 DOI: 10.1371/journal.pone.0130385] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 05/20/2015] [Indexed: 11/30/2022] Open
Abstract
Staphylococcus pseudintermedius is a commensal organism of companion animals that is a significant source of opportunistic infections in dogs. With the emergence of clinical isolates of S. pseudintermedius (chiefly methicillin-resistant S. pseudintermedius (MRSP)) exhibiting increased resistance to nearly all antibiotic classes, new antimicrobials and therapeutic strategies are urgently needed. Thiazole compounds have been previously shown to possess potent antibacterial activity against multidrug-resistant strains of Staphylococcus aureus of human and animal concern. Given the genetic similarity between S. aureus and S. pseudintermedius, this study explores the potential use of thiazole compounds as novel antibacterial agents against methicillin-sensitive S. pseudintermedius (MSSP) and MRSP. A broth microdilution assay confirmed these compounds exhibit potent bactericidal activity (at sub-microgram/mL concentrations) against both MSSA and MRSP clinical isolates while the MTS assay confirmed three compounds (at 10 μg/mL) were not toxic to mammalian cells. A time-kill assay revealed two derivatives rapidly kill MRSP within two hours. However, this rapid bactericidal activity was not due to disruption of the bacterial cell membrane indicating an alternative mechanism of action for these compounds against MRSP. A multi-step resistance selection analysis revealed compounds 4 and 5 exhibited a modest (two-fold) shift in activity over ten passages. Furthermore, all six compounds (at a subinihibitory concentration) demonstrated the ability to re-sensitize MRSP to oxacillin, indicating these compounds have potential use for extending the therapeutic utility of β-lactam antibiotics against MRSP. Metabolic stability analysis with dog liver microsomes revealed compound 3 exhibited an improved physicochemical profile compared to the lead compound. In addition to this, all six thiazole compounds possessed a long post-antibiotic effect (at least 8 hours) against MRSP. Collectively the present study demonstrates these synthetic thiazole compounds possess potent antibacterial activity against both MSSP and MRSP and warrant further investigation into their use as novel antimicrobial agents.
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Affiliation(s)
- Haroon Mohammad
- Department of Comparative Pathobiology, Purdue University College of Veterinary Medicine, West Lafayette, Indiana, United States of America
| | - P. V. Narasimha Reddy
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University College of Pharmacy West Lafayette, Indiana, United States of America
- Purdue Center for Cancer Research, West Lafayette, Indiana, United States of America
| | - Dennis Monteleone
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University College of Pharmacy West Lafayette, Indiana, United States of America
- Purdue Center for Cancer Research, West Lafayette, Indiana, United States of America
| | - Abdelrahman S. Mayhoub
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University College of Pharmacy West Lafayette, Indiana, United States of America
- Purdue Center for Cancer Research, West Lafayette, Indiana, United States of America
| | - Mark Cushman
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University College of Pharmacy West Lafayette, Indiana, United States of America
- Purdue Center for Cancer Research, West Lafayette, Indiana, United States of America
| | - G. Kenitra Hammac
- Department of Comparative Pathobiology, Purdue University College of Veterinary Medicine, West Lafayette, Indiana, United States of America
| | - Mohamed N. Seleem
- Department of Comparative Pathobiology, Purdue University College of Veterinary Medicine, West Lafayette, Indiana, United States of America
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Ooi N, Eady EA, Cove JH, O'Neill AJ. Redox-active compounds with a history of human use: antistaphylococcal action and potential for repurposing as topical antibiofilm agents. J Antimicrob Chemother 2014; 70:479-88. [PMID: 25368206 PMCID: PMC4291238 DOI: 10.1093/jac/dku409] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Objectives To investigate the antistaphylococcal/antibiofilm activity and mode of action (MOA) of a panel of redox-active (RA) compounds with a history of human use and to provide a preliminary preclinical assessment of their potential for topical treatment of staphylococcal infections, including those involving a biofilm component. Methods Antistaphylococcal activity was evaluated by broth microdilution and by time–kill studies with growing and slow- or non-growing cells. The antibiofilm activity of RA compounds, alone and in combination with established antibacterial agents, was assessed using the Calgary Biofilm Device. Established assays were used to examine the membrane-perturbing effects of RA compounds, to measure penetration into biofilms and physical disruption of biofilms and to assess resistance potential. A living skin equivalent model was used to assess the effects of RA compounds on human skin. Results All 15 RA compounds tested displayed antistaphylococcal activity against planktonic cultures (MIC 0.25–128 mg/L) and 7 eradicated staphylococcal biofilms (minimum biofilm eradication concentration 4–256 mg/L). The MOA of all compounds involved perturbation of the bacterial membrane, whilst selected compounds with antibiofilm activity caused destructuring of the biofilm matrix. The two most promising agents [celastrol and nordihydroguaiaretic acid (NDGA)] in respect of antibacterial potency and selective toxicity against bacterial membranes acted synergistically with gentamicin against biofilms, did not damage artificial skin following topical application and exhibited low resistance potential. Conclusions In contrast to established antibacterial drugs, some RA compounds are capable of eradicating staphylococcal biofilms. Of these, celastrol and NDGA represent particularly attractive candidates for development as topical antistaphylococcal biofilm treatments.
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Affiliation(s)
- N Ooi
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds, UK
| | - E A Eady
- Harrogate and District NHS Foundation Trust, Harrogate, UK
| | - J H Cove
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds, UK
| | - A J O'Neill
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds, UK
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Xu C, Yagiz Y, Hsu WY, Simonne A, Lu J, Marshall MR. Antioxidant, antibacterial, and antibiofilm properties of polyphenols from muscadine grape (Vitis rotundifolia Michx.) pomace against selected foodborne pathogens. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:6640-6649. [PMID: 24865879 DOI: 10.1021/jf501073q] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Polyphenols are predominantly secondary metabolites in muscadine grapes, playing an important role in the species' strong resistance to pests and diseases. This study examined the above property by evaluating the antioxidant, antibacterial, and antibiofilm activities of muscadine polyphenols against selected foodborne pathogens. Results showed that antioxidant activity for different polyphenols varied greatly, ranging from 5 to 11.1 mmol Trolox/g. Antioxidant and antibacterial activities for polyphenols showed a positive correlation. Muscadine polyphenols exhibited a broad spectrum of antibacterial activity against tested foodborne pathogens, especially Staphylococcus aureus (MIC = 67-152 mg/L). Muscadine polyphenols at 4 × MIC caused nearly a 5 log10 CFU/mL drop in cell viability for S. aureus in 6 h with lysis, whereas at 0.5 × MIC they inhibited its biofilm formation and at 16 × MIC they eradicated biofilms. Muscadine polyphenols showed synergy with antibiotics and maximally caused a 6.2 log10 CFU/mL drop in cell viability at subinhibitory concentration.
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Affiliation(s)
- Changmou Xu
- Department of Food Science and Human Nutrition and ‡Department of Family, Youth and Community Sciences, University of Florida , Gainesville, Florida 32611, United States
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Targeting methicillin-resistant Staphylococcus aureus with short salt-resistant synthetic peptides. Antimicrob Agents Chemother 2014; 58:4113-22. [PMID: 24798285 DOI: 10.1128/aac.02578-14] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The seriousness of microbial resistance combined with the lack of new antimicrobials has increased interest in the development of antimicrobial peptides (AMPs) as novel therapeutics. In this study, we evaluated the antimicrobial activities of two short synthetic peptides, namely, RRIKA and RR. These peptides exhibited potent antimicrobial activity against Staphylococcus aureus, and their antimicrobial effects were significantly enhanced by addition of three amino acids in the C terminus, which consequently increased the amphipathicity, hydrophobicity, and net charge. Moreover, RRIKA and RR demonstrated a significant and rapid bactericidal effect against clinical and drug-resistant Staphylococcus isolates, including methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-intermediate S. aureus (VISA), vancomycin-resistant S. aureus (VRSA), linezolid-resistant S. aureus, and methicillin-resistant Staphylococcus epidermidis. In contrast to many natural AMPs, RRIKA and RR retained their activity in the presence of physiological concentrations of NaCl and MgCl2. Both RRIKA and RR enhanced the killing of lysostaphin more than 1,000-fold and eradicated MRSA and VRSA isolates within 20 min. Furthermore, the peptides presented were superior in reducing adherent biofilms of S. aureus and S. epidermidis compared to results with conventional antibiotics. Our findings indicate that the staphylocidal effects of our peptides were through permeabilization of the bacterial membrane, leading to leakage of cytoplasmic contents and cell death. Furthermore, peptides were not toxic to HeLa cells at 4- to 8-fold their antimicrobial concentrations. The potent and salt-insensitive antimicrobial activities of these peptides present an attractive therapeutic candidate for treatment of multidrug-resistant S. aureus infections.
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Chemical modulation of the biological activity of reutericyclin: a membrane-active antibiotic from Lactobacillus reuteri. Sci Rep 2014; 4:4721. [PMID: 24739957 PMCID: PMC4894453 DOI: 10.1038/srep04721] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 04/01/2014] [Indexed: 11/08/2022] Open
Abstract
Whilst the development of membrane-active antibiotics is now an attractive therapeutic concept, progress in this area is disadvantaged by poor knowledge of the structure-activity relationship (SAR) required for optimizing molecules to selectively target bacteria. This prompted us to explore the SAR of the Lactobacillus reuteri membrane-active antibiotic reutericyclin, modifying three key positions about its tetramic acid core. The SAR revealed that lipophilic analogs were generally more active against Gram-positive pathogens, but introduction of polar and charged substituents diminished their activity. This was confirmed by cytometric assays showing that inactive compounds failed to dissipate the membrane potential. Radiolabeled substrate assays indicated that dissipation of the membrane potential by active reutericyclins correlated with inhibition of macromolecular synthesis in cells. However, compounds with good antibacterial activities also showed cytotoxicity against Vero cells and hemolytic activity. Although this study highlights the challenge of optimizing membrane-active antibiotics, it shows that by increasing antibacterial potency the selectivity index could be widened, allowing use of lower non-cytotoxic doses.
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Pachuta-Stec A, Kosikowska U, Mazur L, Swatko-Ossor M, Pitucha M, Malm A, Ginalskad G. Synthesis, Characterization and Evaluation of Antimicrobial and Antituberculosis Activities of NewN-(Substituted-thioureido)aminobicyclo Dicarboximide and 3,4-Disubstituted 1,2,4-Triazolino-5-thione. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300362] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Shen L, Maddox MM, Adhikari S, Bruhn DF, Kumar M, Lee RE, Hurdle JG, Lee RE, Sun D. Syntheses and evaluation of macrocyclic engelhardione analogs as antitubercular and antibacterial agents. J Antibiot (Tokyo) 2013; 66:319-25. [PMID: 23549356 DOI: 10.1038/ja.2013.21] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The natural product engelhardione is an underexplored chemotype for developing novel treatments for bacterial infections; we therefore explored this natural product scaffold for chemical diversification and structure-activity relationship studies. Macrocyclic engelhardione and structural regioisomers were synthesized using a series of aldol condensations and selective hydrogenations to generate the 1,7-diarylheptan-3-one derivatives, followed by microwave-assisted intramolecular Ullmann coupling to afford a series of macrocyclic diaryl ether analogs. An extended macrocyclic chemical library was then produced by oxime formation, reductive amination and O-alkylation. Antibacterial evaluation revealed that the reductive amination derivatives 7b and 7d showed moderate activities (minimum inhibitory concentrations: 12.5-25 μg ml(-1)) against Mycobacterium tuberculosis and Gram-positive pathogens, as well as anti-Gram-negative activity against an efflux impaired Escherichia coli strain. These results provide validated leads for further optimization and development.
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Affiliation(s)
- Li Shen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Hawai'i at Hilo, Hilo, HI, USA
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Ooi N, Chopra I, Eady A, Cove J, Bojar R, O'Neill AJ. Antibacterial activity and mode of action of tert-butylhydroquinone (TBHQ) and its oxidation product, tert-butylbenzoquinone (TBBQ). J Antimicrob Chemother 2013; 68:1297-304. [PMID: 23463211 DOI: 10.1093/jac/dkt030] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVES The antioxidant tert-butylhydroquinone (TBHQ) is a food additive reported to have antibacterial activity, and may therefore have application in the healthcare setting. This study sought to characterize the antibacterial activity and mode of action of TBHQ and its oxidation product, tert-butylbenzoquinone (TBBQ). METHODS The stability of TBHQ/TBBQ was studied in buffer. Susceptibility testing was performed by broth microdilution, and killing and lytic activity were evaluated by viable counting and culture turbidity measurements. Mode of action studies included following the incorporation of radiolabelled precursors into macromolecules. The effect of TBHQ/TBBQ upon bacterial and mammalian membranes was assessed using the BacLight(TM) assay and by monitoring the haemolysis of equine erythrocytes. RESULTS TBHQ underwent oxidation in solution to form TBBQ. When oxidation was prevented, TBHQ lacked useful antibacterial activity, indicating that TBBQ is responsible for the antibacterial activity attributed to TBHQ. TBBQ demonstrated activity against Staphylococcus aureus SH1000 (MIC 8 mg/L) and against a panel of clinical S. aureus isolates (MIC90 16 mg/L). TBBQ at 4× MIC caused a >4 log10 drop in cell viability within 6 h without lysis, and eradicated staphylococcal biofilms at 8× MIC. TBBQ did not display preferential inhibition of any single macromolecular synthetic pathway, but caused loss of staphylococcal membrane integrity without haemolytic activity. CONCLUSIONS TBBQ is responsible for the antibacterial activity previously ascribed to TBHQ. TBBQ prompts loss of staphylococcal membrane integrity; it is rapidly and extensively bactericidal, but is non-lytic. In view of the potent and selective bactericidal activity of TBBQ, this compound warrants further investigation as a candidate antistaphylococcal agent.
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Affiliation(s)
- N Ooi
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds, UK
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Sun D, Hurdle JG, Lee R, Lee R, Cushman M, Pezzuto JM. Evaluation of flavonoid and resveratrol chemical libraries reveals abyssinone II as a promising antibacterial lead. ChemMedChem 2012; 7:1541-5. [PMID: 22847956 PMCID: PMC3516920 DOI: 10.1002/cmdc.201200253] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Indexed: 11/12/2022]
Abstract
Lead on! In the course of screening flavonoid and resveratrol libraries, abyssinone II, a naturally occurring prenylated flavonoid, was found to exhibit relatively good antitubercular and antibacterial activity. Preliminary mechanistic studies revealed that abyssinone II hyperpolarizes the bacterial membrane potential and inhibits the biosynthesis of key cellular macromolecules (DNA, RNA, and protein).
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Affiliation(s)
- Dianqing Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Hawai'i at Hilo, 34 Rainbow Drive, Hilo, HI 96720, USA.
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Duez S, Steib AK, Knochel P. Benzylic Arylation of 2-Methyl-5-membered Heterocycles Using TMP-Bases. Org Lett 2012; 14:1951-3. [PMID: 22489961 DOI: 10.1021/ol300517q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Stéphanie Duez
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Andreas K. Steib
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Paul Knochel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
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Microwave-assisted synthesis of new substituted anilides of quinaldic acid. MOLECULES (BASEL, SWITZERLAND) 2012; 17:1292-306. [PMID: 22293847 PMCID: PMC6268041 DOI: 10.3390/molecules17021292] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 01/13/2012] [Accepted: 01/16/2012] [Indexed: 01/07/2023]
Abstract
In this study a one step method for the preparation of substituted anilides of quinoline-2-carboxylic acid was developed. This efficient innovative approach is based on the direct reaction of an acid or ester with substituted anilines using microwave irradiation. The optimized method was used for the synthesis of a series of eighteen substituted quinoline-2-carboxanilides. The molecular structure of N-(4-bromophenyl)quinoline-2-carboxamide as a model compound was determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group with four molecules within the unit cell and the total structure of the compound can be described as "a slightly screwed boat".
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Duez S, Steib AK, Manolikakes SM, Knochel P. Lewis acid promoted benzylic cross-couplings of pyridines with aryl bromides. Angew Chem Int Ed Engl 2011; 50:7686-90. [PMID: 21721092 DOI: 10.1002/anie.201103074] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Stéphanie Duez
- Department Chemie, Ludwig Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
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Duez S, Steib AK, Manolikakes SM, Knochel P. Lewis-Säure-vermittelte benzylische Kreuzkupplungen von Pyridinen mit Arylbromiden. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201103074] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Further characterization of Bacillus subtilis antibiotic biosensors and their use for antibacterial mode-of-action studies. Antimicrob Agents Chemother 2011; 55:1784-6. [PMID: 21282422 DOI: 10.1128/aac.01710-10] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We further examined the usefulness of previously reported Bacillus subtilis biosensors for antibacterial mode-of-action studies. The biosensors could not detect the tRNA synthetase inhibitors mupirocin, indolmycin, and borrelidin, some inhibitors of peptidoglycan synthesis, and most membrane-damaging agents. However, the biosensors confirmed the modes of action of several RNA polymerase inhibitors and DNA intercalators and provided new insights into the possible modes of action of ciprofloxacin, anhydrotetracycline, corralopyronin, 8-hydroxyquinoline, and juglone.
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Jaric M, Haag B, Unsinn A, Karaghiosoff K, Knochel P. Hoch selektive Metallierungen von Pyridinen und verwandten Heterocyclen mithilfe frustrierter Lewis-Paare sowie tmp-Zink- und tmp-Magnesium-Basen mit BF3⋅OEt2. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002031] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Jaric M, Haag B, Unsinn A, Karaghiosoff K, Knochel P. Highly Selective Metalations of Pyridines and Related Heterocycles Using New Frustrated Lewis Pairs or tmp-Zinc and tmp-Magnesium Bases with BF3⋅OEt2. Angew Chem Int Ed Engl 2010; 49:5451-5. [DOI: 10.1002/anie.201002031] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Camoutsis C, Geronikaki A, Ciric A, Soković M, Zoumpoulakis P, Zervou M. Sulfonamide-1,2,4-thiadiazole derivatives as antifungal and antibacterial agents: synthesis, biological evaluation, lipophilicity, and conformational studies. Chem Pharm Bull (Tokyo) 2010; 58:160-7. [PMID: 20118573 DOI: 10.1248/cpb.58.160] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of thirteen new thiadiazole compounds were synthesized and evaluated for in vitro antifungal and antibacterial activity. All compound tested showed significant antifungal activity against all the micromycetes, compared to the commercial fungicide bifonazole. Differences in their activity depend on the substitution of different reactive groups. More specifically, best antifungal activity was shown for the synthetic analogue with methylpiperazine reactive group. Furthermore, it is apparent that different compounds reacted on different ways against bacteria. An effort was made to correlate the above mentioned differences in activity with lipophilicity studies. Furthermore, NMR and molecular modelling were used to obtain the main conformational features of a potent analogue, for future in silico studies.
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Affiliation(s)
- Charalabos Camoutsis
- School of Health Sciences, Department of Pharmacy, Laboratory of Pharmaceutical Chemistry, University of Patras, Patras 26500, Greece
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Struga M, Rosolowski S, Kossakowski J, Stefanska J. Synthesis and microbiological activity of thiourea derivatives of 4-azatricyclo[5.2.2.02,6]undec-8-ene-3,5-dione. Arch Pharm Res 2010; 33:47-54. [DOI: 10.1007/s12272-010-2223-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Revised: 10/20/2009] [Accepted: 10/20/2009] [Indexed: 11/30/2022]
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Ooi N, Miller K, Randall C, Rhys-Williams W, Love W, Chopra I. XF-70 and XF-73, novel antibacterial agents active against slow-growing and non-dividing cultures of Staphylococcus aureus including biofilms. J Antimicrob Chemother 2009; 65:72-8. [DOI: 10.1093/jac/dkp409] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hobbs JK, Miller K, O'Neill AJ, Chopra I. Consequences of daptomycin-mediated membrane damage in Staphylococcus aureus. J Antimicrob Chemother 2008; 62:1003-8. [PMID: 18669516 DOI: 10.1093/jac/dkn321] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES The proposed lethal action of daptomycin on Staphylococcus aureus results from the loss of K(+) and membrane depolarization. However, whether these events alone cause cell death has been questioned. We sought to determine whether other consequences of daptomycin-mediated membrane damage may contribute to cell death. METHODS Previously established assays were used to evaluate the membrane damaging activity of daptomycin at a single time-point of 10 min. More detailed time-course experiments were also performed to determine the kinetics of membrane depolarization and leakage of K(+), Mg(2+) and ATP. The kinetics of inhibition of macromolecular synthesis following exposure to daptomycin were also determined by assaying the incorporation of radioactive precursors into macromolecules. RESULTS Daptomycin exhibited no membrane damaging activity in single time-point assays following exposure to the antibiotic for 10 min. Kinetic analysis confirmed these results as leakage of intracellular components did not occur until 20-30 min, membrane depolarization was gradual and cells remained biosynthetically active for at least 30 min after exposure to daptomycin. Viability declined rapidly after exposure to daptomycin and appeared to precede other detectable changes. CONCLUSIONS These data show that daptomycin-induced loss of Mg(2+) and ATP occurs in conjunction with the previously reported leakage of K(+) and membrane depolarization. We propose that the lethal activity of daptomycin is not simply due to loss of K(+) and probably involves more general damage to the membrane.
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Affiliation(s)
- Joanne Karen Hobbs
- Antimicrobial Research Centre and Institute of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
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Bozdağ-Dündar O, Ozgen O, Menteşe A, Altanlar N, Atli O, Kendi E, Ertan R. Synthesis and antimicrobial activity of some new thiazolyl thiazolidine-2,4-dione derivatives. Bioorg Med Chem 2007; 15:6012-7. [PMID: 17618124 DOI: 10.1016/j.bmc.2007.06.049] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2007] [Revised: 06/21/2007] [Accepted: 06/26/2007] [Indexed: 11/24/2022]
Abstract
In this study, a series of thiazolyl thiazolidine-2,4-dione derivatives (Va-f and VIa-f) were synthesized and evaluated for their antibacterial and antifungal activities against Staphylococcus aureus (ATCC 25923), methicillin resistant S. aureus (MRSA ATCC 43300), methicillin resistant S. aureus (MRSA isolate), and Escherichia coli (ATCC 23556) and C. albicans (ATCC10145). All the compounds were found active against used microorganisms.
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Affiliation(s)
- Oya Bozdağ-Dündar
- Ankara University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, 06100 Tandoğan, Ankara, Turkey.
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Bryskier A. Anti-MRSA agents: under investigation, in the exploratory phase and clinically available. Expert Rev Anti Infect Ther 2007; 3:505-53. [PMID: 16107196 DOI: 10.1586/14787210.3.4.505] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Staphylococcal infections are difficult to treat due to the rapid emergence of methicillin-resistant staphylococci and, unfortunately, vancomycin-intermediate or -resistant staphylococci. Numerous alternative treatments are urgently required. In this special report, intensive research of new molecules is highlighted--in known antibacterial families and new medicinal chemical entities.
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Affiliation(s)
- André Bryskier
- Aventis Pharma, Infectious Disease Group-Clinical Pharmacology, 102, Route de Noisy, 93230 Romaiville, Cedex, France.
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Ferrini AM, Mannoni V, Aureli P, Salvatore G, Piccirilli E, Ceddia T, Pontieri E, Sessa R, Oliva B. Melaleuca alternifolia essential oil possesses potent anti-staphylococcal activity extended to strains resistant to antibiotics. Int J Immunopathol Pharmacol 2006; 19:539-44. [PMID: 17026838 DOI: 10.1177/039463200601900309] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Melaleuca alternifolia Cheel essential oil (TTO) and its major component terpinen-4-ol were examined against a large number of clinical isolates of Staphylococcus aureus to establish their anti-staphylococcal activities. Classic and established procedures were used to study M.I.C., time-kill curves, synergism and mutational frequency. The anti-staphylococcal activity of terpinen-4-ol and TTO were superior to those of antibiotics belonging to the major families (all the tested drugs are for topical use or included in ointments, eye drops or used during surgery); terpinen 4-ol and TTO were active against strains resistant to mupirocin, fusidic acid, vancomycin, methicillin and linezolid. TTO and terpinen-4-ol were bactericidal as revealed by time-kill curves; the frequency of mutational frequency to TTO was < 2.9 x 10 9. The study demonstrates good anti-staphylococcal activity of TTO and terpinen-4-ol against a large number of S.aureus isolates and suggests the possible application of these agents for topical treatment of staphylococcal infections. This is the first extensive study on the anti-staphylococcal activity of TTO. The results suggest that this compound may have application as a topical agent for the control of superficial staphylococcal infections, including activity against organisms resistant to antibiotics which can be used, or are specific, for topical use.
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Affiliation(s)
- A M Ferrini
- Istituto Superiore di Sanita, National Centre for Food Quality, Rome, Italy
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Marrero-Ponce Y, Medina-Marrero R, Torrens F, Martinez Y, Romero-Zaldivar V, Castro EA. Atom, atom-type, and total nonstochastic and stochastic quadratic fingerprints: a promising approach for modeling of antibacterial activity. Bioorg Med Chem 2005; 13:2881-99. [PMID: 15781398 DOI: 10.1016/j.bmc.2005.02.015] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Accepted: 02/09/2005] [Indexed: 11/16/2022]
Abstract
The TOpological MOlecular COMputer Design (TOMOCOMD-CARDD) approach has been introduced for the classification and design of antimicrobial agents using computer-aided molecular design. For this propose, atom, atom-type, and total quadratic indices have been generalized to codify chemical structure information. In this sense, stochastic quadratic indices have been introduced for the description of the molecular structure. These stochastic fingerprints are based on a simple model for the intramolecular movement of all valence-bond electrons. In this work, a complete data set containing 1006 antimicrobial agents is collected and presented. Two structure-based antibacterial activity classification models have been generated. The models (including nonstochastic and stochastic indices) classify correctly more than 90% of 1525 compounds in training sets. These models permit the correct classification of 92.28% and 89.31% of 505 compounds in an external test sets. The TOMOCOMD-CARDD approach, also, satisfactorily compares with respect to nine of the most useful models for antimicrobial selection reported to date. Finally, a virtual screening of 87 new compounds reported in the antiinfective field with antibacterial activities is developed showing the ability of the TOMOCOMD-CARDD models to identify new leads as antibacterial.
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Affiliation(s)
- Yovani Marrero-Ponce
- Department of Pharmacy, Faculty of Chemical-Pharmacy, Central University of Las Villas, Santa Clara 54830, Villa Clara, Cuba.
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O'Neill AJ, Miller K, Oliva B, Chopra I. Comparison of assays for detection of agents causing membrane damage in Staphylococcus aureus. J Antimicrob Chemother 2004; 54:1127-9. [PMID: 15531595 DOI: 10.1093/jac/dkh476] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES To develop a novel beta-galactosidase leakage assay for Staphylococcus aureus and to evaluate this alongside other simple methods for detection of agents that cause membrane damage in staphylococci. METHODS Using a PCR-based approach, a derivative of S. aureus RN4220 was constructed carrying the Escherichia coli lacZ gene under the control of the strong staphylococcal promoter, cap1A. Leakage of beta-galactosidase (BG) from this strain was examined after exposure for 10 min to various membrane-damaging agents at 4 x MIC, using a fluorescence assay and the substrate 4-methylumbelliferyl-beta-d-galactoside. Other assays for membrane damage involving protoplast lysis (PL), leakage of material absorbing at 260 nm (OD) and ATP release as well as the BacLight (BL) assay were carried out using established methods. RESULTS All the assays, with the exception of the PL assay, detected membrane damage induced by cetyltrimethylammonium bromide, nisin, clofazimine and protegrin IB-367. However, the ability to detect membrane damage induced by these agents differed between the assay systems. The assays also varied considerably in their signal-to-noise ratio, with the ATP assay providing values for nisin approaching 100-fold that of the control. CONCLUSIONS The PL assay is unsuitable for detection of membrane-damaging agents in S. aureus. The other assays, including the BG assay, detect membrane damage. The OD assay should be sufficient for most purposes since it is effective, rapid and cheap to perform. Studies requiring maximum sensitivity and discrimination should employ the ATP assay.
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Affiliation(s)
- Alexander John O'Neill
- Antimicrobial Research Centre and School of Biochemistry and Microbiology, University of Leeds, Leeds LS2 9JT, UK
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