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Lingamgunta S, Xiao Y, Choi H, Christie G, Fruk L. Microwave-enhanced antibacterial activity of polydopamine-silver hybrid nanoparticles. RSC Adv 2024; 14:8331-8340. [PMID: 38469191 PMCID: PMC10926840 DOI: 10.1039/d3ra07543e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 02/26/2024] [Indexed: 03/13/2024] Open
Abstract
The ever-increasing risks posed by antibiotic-resistant bacteria have stimulated considerable interest in the development of novel antimicrobial strategies, including the use of nanomaterials that can be activated on demand and result in irreversible damage to pathogens. Microwave electric field-assisted bactericidal effects on representative Gram-negative and Gram-positive bacterial strains were achieved in the presence of hybrid polydopamine-silver nanoparticles (PDA-Ag NPs) under low-power microwave irradiation using a resonant cavity (1.3 W, 2.45 GHz). A 3-log reduction in the viability of bacterial populations was observed within 30 minutes which was attributed to the attachment of PDA-Ag NPs and associated membrane disruption in conjunction with the production of intra-bacterial reactive oxygen species (ROS). A synergistic effect between PDA and Ag has been demonstrated whereby PDA acts both as an Ag NP carrier and a microwave enhancer. These properties together with the remarkable adhesivity of PDA are opening a route to design of antibacterial adhesives and surface coatings for prevention of biofilm formation.
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Affiliation(s)
- Swetha Lingamgunta
- Department of Chemical Engineering and Biotechnology, University of Cambridge Cambridge UK
| | - Yao Xiao
- Department of Chemical Engineering and Biotechnology, University of Cambridge Cambridge UK
| | | | - Graham Christie
- Department of Chemical Engineering and Biotechnology, University of Cambridge Cambridge UK
| | - Ljiljana Fruk
- Department of Chemical Engineering and Biotechnology, University of Cambridge Cambridge UK
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Lin CH, Shyu CL, Wu ZY, Wang CM, Chiou SH, Chen JY, Tseng SY, Lin TE, Yuan YP, Ho SP, Tung KC, Mao FC, Lee HJ, Tu WC. Antimicrobial Peptide Mastoparan-AF Kills Multi-Antibiotic Resistant Escherichia coli O157:H7 via Multiple Membrane Disruption Patterns and Likely by Adopting 3-11 Amphipathic Helices to Favor Membrane Interaction. MEMBRANES 2023; 13:251. [PMID: 36837754 PMCID: PMC9961542 DOI: 10.3390/membranes13020251] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/07/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
We investigated the antimicrobial activity and membrane disruption modes of the antimicrobial peptide mastoparan-AF against hemolytic Escherichia coli O157:H7. Based on the physicochemical properties, mastoparan-AF may potentially adopt a 3-11 amphipathic helix-type structure, with five to seven nonpolar or hydrophobic amino acid residues forming the hydrophobic face. E. coli O157:H7 and two diarrheagenic E. coli veterinary clinical isolates, which are highly resistant to multiple antibiotics, are sensitive to mastoparan-AF, with minimum inhibitory and bactericidal concentrations (MIC and MBC) ranging from 16 to 32 μg mL-1 for E. coli O157:H7 and four to eight μg mL-1 for the latter two isolates. Mastoparan-AF treatment, which correlates proportionally with membrane permeabilization of the bacteria, may lead to abnormal dents, large perforations or full opening at apical ends (hollow tubes), vesicle budding, and membrane corrugation and invagination forming irregular pits or pores on E. coli O157:H7 surface. In addition, mRNAs of prepromastoparan-AF and prepromastoparan-B share a 5'-poly(A) leader sequence at the 5'-UTR known for the advantage in cap-independent translation. This is the first report about the 3-11 amphipathic helix structure of mastoparans to facilitate membrane interaction. Mastoparan-AF could potentially be employed to combat multiple antibiotic-resistant hemolytic E. coli O157:H7 and other pathogenic E. coli.
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Affiliation(s)
- Chun-Hsien Lin
- Department of Entomology, National Chung Hsing University, Taichung 40227, Taiwan
| | - Ching-Lin Shyu
- Graduate Institute of Microbiology and Public Health, National Chung Hsing University, Taichung 40227, Taiwan
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 40227, Taiwan
| | - Zong-Yen Wu
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 40227, Taiwan
| | - Chao-Min Wang
- Department of Veterinary Medicine, National Chiayi University, Chiayi 60054, Taiwan
| | - Shiow-Her Chiou
- Graduate Institute of Microbiology and Public Health, National Chung Hsing University, Taichung 40227, Taiwan
| | - Jiann-Yeu Chen
- i-Center for Advanced Science and Technology, National Chung Hsing University, Taichung 40227, Taiwan
| | - Shu-Ying Tseng
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 40227, Taiwan
- Veterinary Medical Teaching Hospital, National Chung Hsing University, Taichung 40227, Taiwan
| | - Ting-Er Lin
- Graduate Institute of Microbiology and Public Health, National Chung Hsing University, Taichung 40227, Taiwan
| | - Yi-Po Yuan
- Graduate Institute of Microbiology and Public Health, National Chung Hsing University, Taichung 40227, Taiwan
| | - Shu-Peng Ho
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 40227, Taiwan
| | - Kwong-Chung Tung
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 40227, Taiwan
- Veterinary Medical Teaching Hospital, National Chung Hsing University, Taichung 40227, Taiwan
| | - Frank Chiahung Mao
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 40227, Taiwan
| | - Han-Jung Lee
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien 974301, Taiwan
| | - Wu-Chun Tu
- Department of Entomology, National Chung Hsing University, Taichung 40227, Taiwan
- National Mosquito-Borne Diseases Control Research Center, National Health Research Institutes, Kaohsiung 801301, Taiwan
- School of Life Sciences and Technology, Institut Teknologi Bandung, Bandung 40132, West Java, Indonesia
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Characterization of a biosurfactant producing electroactive Bacillus sp. for enhanced Microbial Fuel Cell dye decolourisation. Enzyme Microb Technol 2021; 147:109767. [PMID: 33992401 DOI: 10.1016/j.enzmictec.2021.109767] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 02/19/2021] [Accepted: 02/23/2021] [Indexed: 11/20/2022]
Abstract
A biosurfactant producing Gram positive bacterium isolated from anodic biofilm of textile wastewater fed MFC was identified as Bacillus sp. MFC (Accession number: MT322244). Scanning Electron Microscopy of the bacterium showed appendages, the bacterium forms biofilm on Congo red agar medium. The obtained results showed that the addition of 5 mg/l endogenous biosurfactant to the bacterial cells resulted in 19-fold increase in bacterial surface-bound exopolysaccharides (EPS) and 1.94-fold increase in biofilm. However, when the biosurfactant concentration increased to 20 and 40 mg/l, EPS and biofilm decreased and the cells lost their colony forming ability. The dielectric properties of the bacterial cells showed increase in conductivity and relative permittivity with increasing biosurfactant concentrations. The shape of the voltammogram currents peak, their location and Electrochemical impedance spectroscopy (EIS) suggest the involvement of biofilm as direct electron transfer pathway. The average voltage obtained was 0.65 V as compared to 0.45 V for the control MFC. Decolourization was tested for Congo red in a double chamber Microbial Fuel Cell (MFC), the results showed 2-fold increase in decolourization when biosurfactant is added post biofilm formation. The results confirm that Bacillus sp. MFC possess electrogenic properties and that adding low concentrations of endogenous biosurfactant to 24 h biofilm accelerates electron transfer by inducing perforations in the cell wall and increasing EPS as an electron transfer transient medium. Therefore, MFC performance can be enhanced.
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