1
|
Yang ZY, Jiang WY, Ran SY. Reductant-dependent DNA-templated silver nanoparticle formation kinetics. Phys Chem Chem Phys 2023; 25:23197-23206. [PMID: 37605826 DOI: 10.1039/d3cp02623j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
DNA molecules have been demonstrated to be good templates for producing silver nanoparticles (AgNPs), with the advantages of well-controlled sizes, shapes, and properties. Revealing the formation kinetics of DNA-templated AgNPs is crucial for their efficient synthesis. Herein, using magnetic tweezers, we studied the reduction kinetics of the Ag+-DNA structure and the subsequent nucleation kinetics by adding NaBH4, L-ascorbic acid, and sodium citrate solutions. At [Ag+] = 0.01 mM, the addition of NaBH4 solution with the same concentration resulted in the restoration of DNA. In contrast, by increasing the [NaBH4]/[Ag+] ratio (r) to 10 and 100, the DNA extension initially decreased rapidly and then increased, indicating nucleation-dissolution kinetics. With AgNO3 solutions of higher concentrations (0.1 mM and 1 mM), direct particle nucleation and growth kinetics were observed by adding a tenfold (r = 10) or a hundredfold (r = 100) amount of NaBH4, which were evidenced by a significant reduction in DNA extension. The reductant dependence of the kinetics was further investigated. Addition of L-ascorbic acid to the DNA-Ag+ solution yielded an increase-decrease kinetics that was different from that caused by NaBH4, suggesting that nucleation was not initially favored due to the lack of sufficient Ag atoms; while sodium citrate showed a weak nucleation-promoting ability to form AgNPs. We discussed the findings within the framework of classical nucleation theory, in which the supersaturation of the Ag atom is strongly influenced by multiple factors (including the reducing ability of the reductant), resulting in different kinetics.
Collapse
Affiliation(s)
- Zi-Yang Yang
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Wen-Yan Jiang
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Shi-Yong Ran
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| |
Collapse
|
2
|
Mendes-Oliveira G, Luo Y, Zhou B, Gu G, Teng Z, Bolten S, Park E, Pearlstein D, Turner ER, Millner PD, Nou X. Use of a silver-based sanitizer to accelerate Escherichia coli die-off on fresh-cut lettuce and maintain produce quality during cold storage: Laboratory and pilot-plant scale tests. Food Res Int 2022; 157:111170. [PMID: 35761517 DOI: 10.1016/j.foodres.2022.111170] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 11/16/2022]
Abstract
Outbreaks and product recalls involving romaine and iceberg lettuce are frequently reported in the United States. Novel technologies are needed to inactivate pathogens without compromising product quality and shelf life. In this study, the effects of a process aid composed of silver dihydrogen citrate, glycerin, and lactic acid (SGL) on Escherichia coli and Listeria monocytogenes concentrations on lettuce immediately after washing and during cold storage were evaluated. Sensory and quality attributes of fresh-cut iceberg lettuce were also evaluated. Laboratory results indicated that application of SGL solution for 30 s as a first step in the washing process resulted in a 3.15 log reduction in E. coli O157:H7 immediately after washing. For E. coli O157:H7 a significant difference between SGL treatment and all other treatments was maintained until day 7. On day zero, SGL led to a 2.94 log reduction of L. monocytogenes. However, there was no significant difference between treatments with or without SGL regardless of storage time. Pilot-plant results showed that samples receiving SGL spray followed by chlorinated flume wash exhibited a greater reduction (1.48 log) in nonpathogenic E. coli populations at the end of shelf life than other treatments (p < 0.05). Additional pilot plant tests were conducted to investigate the hypothesis that SGL residues could continue to impact microbial survival on the final washed lettuce. Results show that pathogens introduced subsequent to flume washing of lettuce pretreated with SGL solution were not affected by antimicrobial residues. The final quality and shelf life of flume washed lettuce were also unaffected by pretreatment with SGL. In conclusion, the results of this study demonstrate that this new technology has the potential to accelerate E. coli die-off on fresh-cut lettuce during cold storage and improve product safety, while not affecting quality throughout the shelf life of the finished products.
Collapse
Affiliation(s)
- Gabriella Mendes-Oliveira
- Environmental Microbial and Food Safety Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Yaguang Luo
- Environmental Microbial and Food Safety Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States; Food Quality Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Bin Zhou
- Food Quality Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Ganyu Gu
- Environmental Microbial and Food Safety Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Zi Teng
- Food Quality Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Samantha Bolten
- Environmental Microbial and Food Safety Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Eunhee Park
- Food Quality Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Daniel Pearlstein
- Food Quality Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Ellen R Turner
- Food Quality Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| | - Patricia D Millner
- Environmental Microbial and Food Safety Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States.
| | - Xiangwu Nou
- Environmental Microbial and Food Safety Laboratory, United States Department of Agriculture, USDA-ARS, Beltsville, MD 20705, United States
| |
Collapse
|
3
|
Ru XM, Yang ZY, Ran SY. Lanthanide ions induce DNA compaction with ionic specificity. Int J Biol Macromol 2022; 210:292-299. [DOI: 10.1016/j.ijbiomac.2022.04.182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/24/2022] [Accepted: 04/25/2022] [Indexed: 11/05/2022]
|
4
|
Alves-Barroco C, Rivas-García L, Fernandes AR, Baptista PV. Light Triggered Enhancement of Antibiotic Efficacy in Biofilm Elimination Mediated by Gold-Silver Alloy Nanoparticles. Front Microbiol 2022; 13:841124. [PMID: 35295305 PMCID: PMC8919054 DOI: 10.3389/fmicb.2022.841124] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 01/24/2022] [Indexed: 12/21/2022] Open
Abstract
Bacterial biofilm is a tri-dimensional complex community of cells at different metabolic stages involved in a matrix of self-produced extracellular polymeric substances. Biofilm formation is part of a defense mechanism that allows the bacteria to survive in hostile environments, such as increasing resistance or tolerance to antimicrobial agents, causing persistent infections hard to treat and impair disease eradication. One such example is bovine mastitis associated with Streptococcus dysgalactiae subsp. dysgalactiae (SDSD), whose worldwide health and economic impact is on the surge. As such, non-conventional nanobased approaches have been proposed as an alternative to tackle biofilm formation and to which pathogenic bacteria fail to adapt. Among these, metallic nanoparticles have gained significant attention, particularly gold and silver nanoparticles, due to their ease of synthesis and impact against microorganism growth. This study provides a proof-of-concept investigation into the use of gold-silver alloy nanoparticles (AuAgNPs) toward eradication of bacterial biofilms. Upon visible light irradiation of AuAgNPs there was considerable disturbance of the biofilms' matrix. The hindering of structural integrity of the biofilm matrix resulted in an increased permeability for entry of antibiotics, which then cause the eradication of biofilm and inhibit subsequent biofilm formation. Additionally, our results that AuAgNPs inhibited the formation of SDSD biofilms via distinct stress pathways that lead to the downregulation of two genes critical for biofilm production, namely, brpA-like encoding biofilm regulatory protein and fbpA fibronectin-binding protein A. This study provides useful information to assist the development of nanoparticle-based strategies for the active treatment of biofilm-related infections triggered by photoirradiation in the visible.
Collapse
Affiliation(s)
- Cinthia Alves-Barroco
- Applied Molecular Biosciences Unit, Dept. Ciências da Vida, NOVA School of Science and Technology, Costa da Caparica, Portugal
- i4HB, Associate Laboratory–Institute for Health and Bioeconomy, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Lorenzo Rivas-García
- Applied Molecular Biosciences Unit, Dept. Ciências da Vida, NOVA School of Science and Technology, Costa da Caparica, Portugal
- Biomedical Research Centre, Institute of Nutrition and Food Technology, Department of Physiology, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Alexandra R. Fernandes
- Applied Molecular Biosciences Unit, Dept. Ciências da Vida, NOVA School of Science and Technology, Costa da Caparica, Portugal
- i4HB, Associate Laboratory–Institute for Health and Bioeconomy, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Pedro Viana Baptista
- Applied Molecular Biosciences Unit, Dept. Ciências da Vida, NOVA School of Science and Technology, Costa da Caparica, Portugal
- i4HB, Associate Laboratory–Institute for Health and Bioeconomy, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Caparica, Portugal
| |
Collapse
|
5
|
Sayed Ahmed HI, Elsherif DE, El-Shanshory AR, Haider AS, Gaafar RM. Silver nanoparticles and Chlorella treatments induced glucosinolates and kaempferol key biosynthetic genes in Eruca sativa. BENI-SUEF UNIVERSITY JOURNAL OF BASIC AND APPLIED SCIENCES 2021. [DOI: 10.1186/s43088-021-00139-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Abstract
Background
Microalgae and nanoparticles are currently considered promising tools for numerous agricultural and biotechnological applications. The green microalga Chlorella sp. MF1 and its biosynthesized silver nanoparticles (AgNPs) were used in this study as biofortification agents to enhance glucosinolate and kaempferol levels in Eruca sativa. UV–visible spectroscopy, XRD, FTIR and TEM were comprehensively used for characterizing Chlorella-based AgNPs.
Results
The biosynthesized AgNPs were found to be spherical in shape, with size ranging from 1.45 to 5.08 nm. According to FTIR measurements, silver ions were reduced to AgNPs by functional groups such as amide, hydroxyl and carboxylate. Different experimental treatments were conducted, including either soaking seeds of E. sativa or foliar spray with various concentrations of Chlorella suspension (1, 2, 3 and 4 g L−1) and AgNPs (5, 10, 20 and 40 mg L−1). Expression levels of five key genes in the biosynthetic pathway of glucosinolates (MAM1, SUR1, MYB34 and MYB51) and kaempferol (CHS) were assessed using qRT-PCR. The results indicated an upregulation in the gene expression levels in all treatments compared to control, recording the highest level at 40 mg L−1 AgNPs and 4 g L−1Chlorella suspension. In addition, high glucosinolates and kaempferol content was detected in plants whose leaves were sprayed with AgNPs and Chlorella suspension (40 mg L−1 and 4 g L−1) based on HPLC analysis. Sequence analysis of amplified CHS fragments from E. sativa plants treated with AgNPs (40 mg L−1) showed high sequence similarity to A. thaliana CHS gene. However, there were several CHS regions with sequence polymorphism (SNPs and Indels) in foliar sprayed plants.
Conclusions
Results of this study evidenced that the application of AgNPs and Chlorella suspension increased glucosinolates and kaempferol content in E. sativa through upregulation of key genes in their biosynthetic pathway.
Collapse
|
6
|
Rahuman HBH, Dhandapani R, Palanivel V, Thangavelu S, Paramasivam R, Muthupandian S. Bioengineered phytomolecules-capped silver nanoparticles using Carissa carandas leaf extract to embed on to urinary catheter to combat UTI pathogens. PLoS One 2021; 16:e0256748. [PMID: 34473763 PMCID: PMC8412375 DOI: 10.1371/journal.pone.0256748] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 08/14/2021] [Indexed: 12/04/2022] Open
Abstract
Rising incidents of urinary tract infections (UTIs) among catheterized patients is a noteworthy problem in clinic due to their colonization of uropathogens on abiotic surfaces. Herein, we have examined the surface modification of urinary catheter by embedding with eco-friendly synthesized phytomolecules-capped silver nanoparticles (AgNPs) to prevent the invasion and colonization of uropathogens. The preliminary confirmation of AgNPs production in the reaction mixture was witnessed by the colour change and surface resonance plasmon (SRP) band at 410nm by UV–visible spectroscopy. The morphology, size, crystalline nature, and elemental composition of attained AgNPs were further confirmed by the transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD) technique, Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The functional groups of AgNPs with stabilization/capped phytochemicals were detected by Fourier-transform infrared spectroscopy (FTIR). Further, antibiofilm activity of synthesized AgNPs against biofilm producers such as Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were determined by viability assays and micrographically. AgNPs coated and coating-free catheters performed to treat with bacterial pathogen to analyze the mat formation and disruption of biofilm formation. Synergistic effect of AgNPs with antibiotic reveals that it can enhance the activity of antibiotics, AgNPs coated catheter revealed that, it has potential antimicrobial activity and antibiofilm activity. In summary, C. carandas leaf extract mediated synthesized AgNPs will open a new avenue and a promising template to embed on urinary catheter to control clinical pathogens.
Collapse
Affiliation(s)
| | - Ranjithkumar Dhandapani
- Department of Microbiology, Science Campus, Alagappa University, Karaikudi, Tamilnadu, India
| | - Velmurugan Palanivel
- Centre for for Material Engineering and Regenerative Medicine Bharath Institute of Higher Education, Chennai, India
- * E-mail: (SM); (VP)
| | | | - Ragul Paramasivam
- Chimertech Innovations LLP, Tamilnadu Veterinary and Animal Science University, Chennai, India
| | - Saravanan Muthupandian
- Division of Biomedical sciences, College of Health Sciences, School of Medicine, Mekelle, Ethiopia
- AMR and Nanomedicine Laboratory, Department of Pharmacology, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, India
- * E-mail: (SM); (VP)
| |
Collapse
|
7
|
Nag M, Lahiri D, Sarkar T, Ghosh S, Dey A, Edinur HA, Pati S, Ray RR. Microbial Fabrication of Nanomaterial and Its Role in Disintegration of Exopolymeric Matrices of Biofilm. Front Chem 2021. [PMID: 34109159 DOI: 10.3389/fchem.2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023] Open
Abstract
Bacterial biofilms are responsible for the development of various chronic wound-related and implant-mediated infections and confer protection to the pathogenic bacteria against antimicrobial drugs and host immune responses. Hence, biofilm-mediated chronic infections have created a tremendous burden upon healthcare systems worldwide. The development of biofilms upon the surface of medical implants has resulted in the failure of various implant-based surgeries and therapies. Although different conventional chemical and physical agents are used as antimicrobials, they fail to kill the sessile forms of bacterial pathogens due to the resistance exerted by the exopolysaccharide (EPS) matrices of the biofilm. One of the major techniques used in addressing such a problem is to directly check the biofilm formation by the use of novel antibiofilm materials, local drug delivery, and device-associated surface modifications, but the success of these techniques is still limited. The immense expansion in the field of nanoscience and nanotechnology has resulted in the development of novel nanomaterials as biocidal agents that can be either easily integrated within biomaterials to prevent the colonization of microbial cells or directly approach the pathogen overcoming the biofilm matrix. The antibiofilm efficacies of these nanomaterials are accomplished by the generation of oxidative stresses and through alterations of the genetic expressions. Microorganism-assisted synthesis of nanomaterials paved the path to success in such therapeutic approaches and is found to be more acceptable for its "greener" approach. Metallic nanoparticles functionalized with microbial enzymes, silver-platinum nanohybrids (AgPtNHs), bacterial nanowires, superparamagnetic iron oxide (Fe3O4), and nanoparticles synthesized by both magnetotactic and non-magnetotactic bacteria showed are some of the examples of such agents used to attack the EPS.
Collapse
Affiliation(s)
- Moupriya Nag
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - Dibyajit Lahiri
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - Tanmay Sarkar
- Department of Food Technology and Bio-Chemical Engineering, Jadavpur University, Kolkata, India.,Malda Polytechnic, West Bengal State Council of Technical Education, Government of West Bengal, Malda, India
| | | | - Ankita Dey
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, India
| | - Hisham Atan Edinur
- School of Health Sciences, University Sains Malaysia, Kelantan, Malaysia
| | - Siddhartha Pati
- Centre of Excellence, Khallikote University, Berhampur, India.,Research Division, Association for Biodiversity Conservation and Research (ABC), Balasore, India
| | - Rina Rani Ray
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, India
| |
Collapse
|
8
|
Nag M, Lahiri D, Sarkar T, Ghosh S, Dey A, Edinur HA, Pati S, Ray RR. Microbial Fabrication of Nanomaterial and Its Role in Disintegration of Exopolymeric Matrices of Biofilm. Front Chem 2021; 9:690590. [PMID: 34109159 PMCID: PMC8181132 DOI: 10.3389/fchem.2021.690590] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Accepted: 05/06/2021] [Indexed: 12/11/2022] Open
Abstract
Bacterial biofilms are responsible for the development of various chronic wound-related and implant-mediated infections and confer protection to the pathogenic bacteria against antimicrobial drugs and host immune responses. Hence, biofilm-mediated chronic infections have created a tremendous burden upon healthcare systems worldwide. The development of biofilms upon the surface of medical implants has resulted in the failure of various implant-based surgeries and therapies. Although different conventional chemical and physical agents are used as antimicrobials, they fail to kill the sessile forms of bacterial pathogens due to the resistance exerted by the exopolysaccharide (EPS) matrices of the biofilm. One of the major techniques used in addressing such a problem is to directly check the biofilm formation by the use of novel antibiofilm materials, local drug delivery, and device-associated surface modifications, but the success of these techniques is still limited. The immense expansion in the field of nanoscience and nanotechnology has resulted in the development of novel nanomaterials as biocidal agents that can be either easily integrated within biomaterials to prevent the colonization of microbial cells or directly approach the pathogen overcoming the biofilm matrix. The antibiofilm efficacies of these nanomaterials are accomplished by the generation of oxidative stresses and through alterations of the genetic expressions. Microorganism-assisted synthesis of nanomaterials paved the path to success in such therapeutic approaches and is found to be more acceptable for its "greener" approach. Metallic nanoparticles functionalized with microbial enzymes, silver-platinum nanohybrids (AgPtNHs), bacterial nanowires, superparamagnetic iron oxide (Fe3O4), and nanoparticles synthesized by both magnetotactic and non-magnetotactic bacteria showed are some of the examples of such agents used to attack the EPS.
Collapse
Affiliation(s)
- Moupriya Nag
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - Dibyajit Lahiri
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - Tanmay Sarkar
- Department of Food Technology and Bio-Chemical Engineering, Jadavpur University, Kolkata, India
- Malda Polytechnic, West Bengal State Council of Technical Education, Government of West Bengal, Malda, India
| | | | - Ankita Dey
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, India
| | - Hisham Atan Edinur
- School of Health Sciences, University Sains Malaysia, Kelantan, Malaysia
| | - Siddhartha Pati
- Centre of Excellence, Khallikote University, Berhampur, India
- Research Division, Association for Biodiversity Conservation and Research (ABC), Balasore, India
| | - Rina Rani Ray
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, India
| |
Collapse
|
9
|
Matiadis D, Karagiaouri M, Mavroidi B, Nowak KE, Katsipis G, Pelecanou M, Pantazaki A, Sagnou M. Synthesis and antimicrobial evaluation of a pyrazoline-pyridine silver(I) complex: DNA-interaction and anti-biofilm activity. Biometals 2020; 34:67-85. [PMID: 33156436 DOI: 10.1007/s10534-020-00263-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 10/19/2020] [Indexed: 12/15/2022]
Abstract
The emergence of resistant bacterial strains mainly due to misuse of antibiotics has seriously affected our ability to treat bacterial illness, and the development of new classes of potent antimicrobial agents is desperately needed. In this study, we report the efficient synthesis of a new pyrazoline-pyridine containing ligand L1 which acts as an NN-donor for the formation of a novel silver (I) complex 2. The free ligand did not show antibacterial activity. High potency was exhibited by the complex against three Gram-negative bacteria, namely Escherichia coli, Pseudomonas aeruginosa and Acinetobacter baumanii with the minimum inhibitory concentration (MIC) ranging between 4 and 16 μg/mL (4.2-16.7 μM), and excellent activity against the fungi Candida albicans and Cryptococcus neoformans (MIC ≤ 0.25 μg/mL = 0.26 μM). Moreover, no hemolytic activity within the tested concentration range was observed. In addition to the planktonic growth inhibition, the biofilm formation of both Methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa was significantly reduced by the complex at MIC concentrations in a dose-dependent manner for Pseudomonas aeruginosa, whereas a biphasic response was obtained for MRSA showing that the sub-MIC doses enhanced biofilm formation before its reduction at higher concentration. Finally, complex 2 exhibited strong DNA binding with a large drop in DNA viscosity indicating the absence of classical intercalation and suggesting the participation of the silver ion in DNA binding which may be related to its antibacterial activity. Taken together, the current results reveal that the pyrazoline-pyridine silver complexes are of high interest as novel antibacterial agents, justifying further in vitro and in vivo investigation.
Collapse
Affiliation(s)
- Dimitris Matiadis
- National Centre for Scientific Research "Demokritos", Institute of Biosciences and Applications, Athens, Greece
| | - Maria Karagiaouri
- Department of Chemistry, Laboratory of Biochemistry, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
| | - Barbara Mavroidi
- National Centre for Scientific Research "Demokritos", Institute of Biosciences and Applications, Athens, Greece
| | - Katarzyna E Nowak
- Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska St. 141/143, 90-236, Lodz, Poland
| | - Georgios Katsipis
- Department of Chemistry, Laboratory of Biochemistry, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
| | - Maria Pelecanou
- National Centre for Scientific Research "Demokritos", Institute of Biosciences and Applications, Athens, Greece
| | - Anastasia Pantazaki
- Department of Chemistry, Laboratory of Biochemistry, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
| | - Marina Sagnou
- National Centre for Scientific Research "Demokritos", Institute of Biosciences and Applications, Athens, Greece.
| |
Collapse
|
10
|
Joshi AS, Singh P, Mijakovic I. Interactions of Gold and Silver Nanoparticles with Bacterial Biofilms: Molecular Interactions behind Inhibition and Resistance. Int J Mol Sci 2020; 21:E7658. [PMID: 33081366 PMCID: PMC7589962 DOI: 10.3390/ijms21207658] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/08/2020] [Accepted: 10/14/2020] [Indexed: 12/12/2022] Open
Abstract
Many bacteria have the capability to form a three-dimensional, strongly adherent network called 'biofilm'. Biofilms provide adherence, resourcing nutrients and offer protection to bacterial cells. They are involved in pathogenesis, disease progression and resistance to almost all classical antibiotics. The need for new antimicrobial therapies has led to exploring applications of gold and silver nanoparticles against bacterial biofilms. These nanoparticles and their respective ions exert antimicrobial action by damaging the biofilm structure, biofilm components and hampering bacterial metabolism via various mechanisms. While exerting the antimicrobial activity, these nanoparticles approach the biofilm, penetrate it, migrate internally and interact with key components of biofilm such as polysaccharides, proteins, nucleic acids and lipids via electrostatic, hydrophobic, hydrogen-bonding, Van der Waals and ionic interactions. Few bacterial biofilms also show resistance to these nanoparticles through similar interactions. The nature of these interactions and overall antimicrobial effect depend on the physicochemical properties of biofilm and nanoparticles. Hence, study of these interactions and participating molecular players is of prime importance, with which one can modulate properties of nanoparticles to get maximal antibacterial effects against a wide spectrum of bacterial pathogens. This article provides a comprehensive review of research specifically directed to understand the molecular interactions of gold and silver nanoparticles with various bacterial biofilms.
Collapse
Affiliation(s)
- Abhayraj S. Joshi
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; (A.S.J.); (P.S.)
| | - Priyanka Singh
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; (A.S.J.); (P.S.)
| | - Ivan Mijakovic
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; (A.S.J.); (P.S.)
- Department of Biology and Biological Engineering, Division of Systems and Synthetic Biology, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| |
Collapse
|
11
|
Liu YF, Ran SY. Divalent metal ions and intermolecular interactions facilitate DNA network formation. Colloids Surf B Biointerfaces 2020; 194:111117. [PMID: 32512310 DOI: 10.1016/j.colsurfb.2020.111117] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 04/30/2020] [Accepted: 05/06/2020] [Indexed: 02/08/2023]
Abstract
The interactions between divalent metal ions and DNA are crucial for basic life processes. These interactions are also important in advanced technological products such as DNA-based ion sensors. Current polyelectrolyte theories cannot describe these interactions well and do not consider the corresponding dynamics. In this study, we report the single-molecule dynamics of the binding of divalent metal ions to a single DNA molecule and the morphology characterization of the complex. We found that most of the divalent metal ions (Mn2+, Zn2+, Co2+, Ni2+, and Cd2+), except Mg2+ and Ca2+, could cause monomolecular DNA condensation. For transition metal ions, different ionic strengths were required to induce the compaction, and different shortening speeds were displayed in the dynamics, indicating ionic specificity. Atomic force microscopy revealed that the morphologies of the metal ion-DNA complexes were affected by the ionic strength of the metal ion, DNA chain length, and DNA concentration. At low metal ion concentration, DNA tended to adopt a random coil conformation. Increasing the ionic strength led to network-like condensed structures, suggesting that divalent metal ions can induce attraction between DNA molecules. Furthermore, higher DNA concentration and longer chain length enhanced intermolecular interactions and consequently resulted in network structures with a higher degree of interconnectivity.
Collapse
Affiliation(s)
- Yin-Feng Liu
- Department of Physics, Wenzhou University, Wenzhou 325035, China
| | - Shi-Yong Ran
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| |
Collapse
|
12
|
Ma F, Wang Y, Yang G. The Modulation of Chitosan-DNA Interaction by Concentration and pH in Solution. Polymers (Basel) 2019; 11:polym11040646. [PMID: 30970619 PMCID: PMC6523332 DOI: 10.3390/polym11040646] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 04/03/2019] [Accepted: 04/08/2019] [Indexed: 12/21/2022] Open
Abstract
Chitosan has been widely used to prepare a DNA carrier for highly efficient and non-toxic gene therapy. In the present study, we investigated DNA charge neutralization and compaction by chitosan in solutions of various pH levels by dynamic light scattering (DLS), magnetic tweezers (MT), and atomic force microscopy (AFM). We found that when chitosan concentration is higher than a critical value (0.2 µM), corresponding the ratio of phosphate and NH2 in chitosan k=1.9, the electrophoretic mobility of DNA-chitosan complex maintains an almost constant value when pH of solution is less 6.5, the isoelectric point of chitosan. Then it decreases with increasing pH of solution. However, when chitosan concentration is lower than the critical value, the mobility of the complex increases with pH in the range of acidity and reaches the maximum when the pH of the solution approaches the isoelectric point of chitosan. It finally decreases with increasing pH in solutions. The corresponding condensing force of the DNA-chitosan complex measured by single molecular MT changes accordingly with its charge neutralization in the same solution concentration (20 µM) and is consistent with the DLS measurements. This phenomenon might be related to the weakening interaction between DNA and chitosan in low pH solutions, and is verified by measuring the ratio of free chitosan to DNA complex in solutions. We also observed the various morphologies of DNA-chitosan complexes, such as ring, rod, flower, braid, and other structures, under different degrees of deacetylation, molecular weight, solution concentration and pH in solutions by AFM.
Collapse
Affiliation(s)
- Fangqin Ma
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Yanwei Wang
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Guangcan Yang
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| |
Collapse
|
13
|
Liu KT, Ran SY. Multistage dynamics of Hg 2+-DNA interactions: a single-molecule study. Phys Chem Chem Phys 2019; 21:2919-2928. [PMID: 30675618 DOI: 10.1039/c8cp07399f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The metal ion-DNA interaction is key to biochemical processes and has applications in areas such as metal ion sensors and DNA nanomachines. For example, the formation of the T-Hg2+-T structure has been used in technologies such as DNA-based mercuric ion sensors. Though the interaction is widely used for practical purposes, the underlying mechanism has not been fully understood. In the present study, we used magnetic tweezers to explore the interactions between λ-DNA and two metal ions, Hg2+ and Cd2+, at the single-molecule level. Both metal ions caused considerable DNA conformational changes. The resulting DNA compaction dynamics were related to the ion concentration and the exerted force. The increase in the ion concentration promoted DNA compaction, whereas exerting greater forces inhibited this process. Application of a high force generated two-stage dynamics of the Hg2+-DNA interaction. However, at a sufficiently high Hg2+ concentration, a lower force led to a three-stage process. In contrast, the curves of the binding of Cd2+ ions to DNA had a stepwise pattern. Both the AFM scanning results and the single-molecule measurements confirmed that Hg2+ influences the DNA conformation in a more pronounced manner than Cd2+. The multistage Hg2+-DNA interaction was considered to be a result of the different binding mechanisms, including the mismatched base-pair formation. A model was then proposed to explain the peculiar dynamics.
Collapse
Affiliation(s)
- Kang-Tao Liu
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | | |
Collapse
|