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Zarei L, Tavallaie R, Choudhury MH, Parker SG, Bakthavathsalam P, Ciampi S, Gonçales VR, Gooding JJ. DNA-Hybridization Detection on Si(100) Surfaces Using Light-Activated Electrochemistry: A Comparative Study between Bovine Serum Albumin and Hexaethylene Glycol as Antifouling Layers. Langmuir 2018; 34:14817-14824. [PMID: 30185042 DOI: 10.1021/acs.langmuir.8b02222] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Light can be used to spatially resolve electrochemical measurements on a semiconductor electrode. This phenomenon has been explored to detect DNA hybridization with light-addressable potentiometric sensors and, more recently, with light-addressable amperometric sensors based on organic-monolayer-protected Si(100). Here, a contribution to the field is presented by comparing sensing performances when bovine serum albumin (BSA) and hexaethylene glycol (OEG6) are employed as antifouling layers that resist nonspecific adsorption to the DNA-modified interface on Si(100) devices. What is observed is that both sensors based on BSA or OEG6 initially allow electrochemical distinction among complementary, noncomplementary, and mismatched DNA targets. However, only surfaces based on OEG6 can sustain electroactivity over time. Our results suggest that this relates to accelerated SiO x formation occasioned by BSA proteins adsorbing on monolayer-protected Si(100) surfaces. Therefore, DNA biosensors were analytically explored on low-doped Si(100) electrodes modified on the molecular level with OEG6 as an antifouling layer. First, light-activated electrochemical responses were recorded over a range of complementary DNA target concentrations. A linear semilog relation was obtained from 1.0 × 10-11 to 1.0 × 10-6 mol L-1 with a correlation coefficient of 0.942. Then, measurements with three independent surfaces indicated a relative standard deviation of 4.5%. Finally, selectivity tests were successfully performed in complex samples consisting of a cocktail mixture of four different DNA sequences. Together, these results indicate that reliable and stable light-activated amperometric DNA sensors can be achieved on Si(100) by employing OEG6 as an antifouling layer.
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Affiliation(s)
- Leila Zarei
- School of Chemistry, Australian Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , New South Wales 2052 , Australia
| | - Roya Tavallaie
- School of Chemistry, Australian Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , New South Wales 2052 , Australia
| | - Moinul H Choudhury
- School of Chemistry, Australian Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , New South Wales 2052 , Australia
| | - Stephen G Parker
- School of Chemistry, Australian Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , New South Wales 2052 , Australia
| | - Padmavathy Bakthavathsalam
- School of Chemistry, Australian Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , New South Wales 2052 , Australia
| | - Simone Ciampi
- Department of Chemistry , Curtin University , Bentley , Western Australia 6102 , Australia
| | - Vinicius R Gonçales
- School of Chemistry, Australian Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , New South Wales 2052 , Australia
| | - J Justin Gooding
- School of Chemistry, Australian Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , New South Wales 2052 , Australia
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2
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Tavallaie R, McCarroll J, Le Grand M, Ariotti N, Schuhmann W, Bakker E, Tilley RD, Hibbert DB, Kavallaris M, Gooding JJ. Nucleic acid hybridization on an electrically reconfigurable network of gold-coated magnetic nanoparticles enables microRNA detection in blood. Nat Nanotechnol 2018; 13:1066-1071. [PMID: 30150634 DOI: 10.1038/s41565-018-0232-x] [Citation(s) in RCA: 195] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 07/13/2018] [Indexed: 05/06/2023]
Abstract
There is intense interest in quantifying the levels of microRNA because of its importance as a blood-borne biomarker. The challenge has been to develop methods that can monitor microRNA expression both over broad concentration ranges and in ultralow amounts directly in a patient's blood. Here, we show that, through electric-field-induced reconfiguration of a network of gold-coated magnetic nanoparticles modified by probe DNA (DNA-Au@MNPs), it is possible to create a highly sensitive sensor for direct analysis of nucleic acids in samples as complex as whole blood. The sensor is the first to be able to detect concentrations of microRNA from 10 aM to 1 nM in unprocessed blood samples. It can distinguish small variations in microRNA concentrations in blood samples of mice with growing tumours. The ultrasensitive and direct detection of microRNA using an electrically reconfigurable DNA-Au@MNPs network makes the reported device a promising tool for cancer diagnostics.
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Affiliation(s)
- Roya Tavallaie
- School of Chemistry, University of New South Wales Sydney, Sydney, New South Wales, Australia
- Australian Centre for NanoMedicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Joshua McCarroll
- Australian Centre for NanoMedicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
- Tumour Biology and Targeting Program, Lowy Cancer Research Centre, Children's Cancer Institute, University of New South Wales Sydney, Sydney, New South Wales, Australia
- School of Women's and Children's Health, Faculty of Medicine, UNSW Sydney, Sydney, New South Wales, Australia
| | - Marion Le Grand
- Tumour Biology and Targeting Program, Lowy Cancer Research Centre, Children's Cancer Institute, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Nicholas Ariotti
- Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New I South Wales Sydney, Sydney, New South Wales, Australia
| | - Wolfgang Schuhmann
- Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Bochum, Germany
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry, University of Geneva, Geneva, Switzerland
| | - Richard David Tilley
- School of Chemistry, University of New South Wales Sydney, Sydney, New South Wales, Australia
- Australian Centre for NanoMedicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
- Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New I South Wales Sydney, Sydney, New South Wales, Australia
| | - David Brynn Hibbert
- School of Chemistry, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Maria Kavallaris
- Australian Centre for NanoMedicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, University of New South Wales Sydney, Sydney, New South Wales, Australia
- Tumour Biology and Targeting Program, Lowy Cancer Research Centre, Children's Cancer Institute, University of New South Wales Sydney, Sydney, New South Wales, Australia
- School of Women's and Children's Health, Faculty of Medicine, UNSW Sydney, Sydney, New South Wales, Australia
| | - John Justin Gooding
- School of Chemistry, University of New South Wales Sydney, Sydney, New South Wales, Australia.
- Australian Centre for NanoMedicine, University of New South Wales Sydney, Sydney, New South Wales, Australia.
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, University of New South Wales Sydney, Sydney, New South Wales, Australia.
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3
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Silva SM, Tavallaie R, Gonçales VR, Utama RH, Kashi MB, Hibbert DB, Tilley RD, Gooding JJ. Dual Signaling DNA Electrochemistry: An Approach To Understand DNA Interfaces. Langmuir 2018; 34:1249-1255. [PMID: 29345941 DOI: 10.1021/acs.langmuir.7b02787] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Electrochemical DNA biosensors composed of a redox marker modified nucleic acid probe tethered to a solid electrode is a common experimental construct for detecting DNA and RNA targets, proteins, inorganic ions, and even small molecules. This class of biosensors generally relies on the binding-induced conformational changes in the distance of the redox marker relative to the electrode surface such that the charge transfer is altered. The conventional design is to attach the redox species to the distal end of a surface-bound nucleic acid strand. Here we show the impact of the position of the redox marker, whether on the distal or proximal end of the DNA monolayer, on the DNA interface electrochemistry. Somewhat unexpectedly, greater currents were obtained when the redox molecules were located on the distal end of the surface-bound DNA monolayer, notionally furthest away from the electrode, compared with currents when the redox species were located on the proximal end, close to the electrode. Our results suggest that a limitation in ion accessibility is the reason why smaller currents were obtained for the redox markers located at the bottom of the DNA monolayer. This understanding shows that to allow the quantification of the amount of redox labeled target DNA strand that hybridizes to probe DNA immobilized on the electrode surface, the redox species must be on the distal end of the surface-bound duplex.
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Affiliation(s)
- Saimon Moraes Silva
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
| | - Roya Tavallaie
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
| | - Vinicius R Gonçales
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
| | - Robert H Utama
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
| | - Mehran B Kashi
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
| | - D Brynn Hibbert
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
| | - Richard D Tilley
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
| | - J Justin Gooding
- School of Chemistry, Australian Centre for NanoMedicine, and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales , Sydney 2052, Australia
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Gebala M, La Mantia F, Michaels PE, Ciampi S, Gupta B, Parker SG, Tavallaie R, Gooding JJ. Electric Field Modulation of Silicon upon Tethering of Highly Charged Nucleic Acids. Capacitive Studies on DNA‐modified Silicon (111). ELECTROANAL 2016. [DOI: 10.1002/elan.201600285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Magdalena Gebala
- Analytische Chemie – Elektroanalytik & Sensorik, Ruhr-Universität Bochum Universitätsstr.150 D-44780 Bochum Germany
- Department of Biochemistry Stanford University Stanford CA 94305 USA
| | - Fabio La Mantia
- Energiespeicher- und Energiewandlersysteme Universität Bremen Wiener Str. 12 D-28359 Bremen Germany
| | - Pauline Eugene Michaels
- School of Chemistry and the Australian Centre for NanoMedicine The University of New South Wales Sydney NSW 2052 Australia
| | - Simone Ciampi
- School of Chemistry and the Australian Centre for NanoMedicine The University of New South Wales Sydney NSW 2052 Australia
| | - Bakul Gupta
- School of Chemistry and the Australian Centre for NanoMedicine The University of New South Wales Sydney NSW 2052 Australia
| | - Stephen G. Parker
- School of Chemistry and the Australian Centre for NanoMedicine The University of New South Wales Sydney NSW 2052 Australia
| | - Roya Tavallaie
- School of Chemistry and the Australian Centre for NanoMedicine The University of New South Wales Sydney NSW 2052 Australia
| | - J. Justin Gooding
- School of Chemistry and the Australian Centre for NanoMedicine The University of New South Wales Sydney NSW 2052 Australia
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5
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Moraes Silva S, Tavallaie R, Sandiford L, Tilley RD, Gooding JJ. Gold coated magnetic nanoparticles: from preparation to surface modification for analytical and biomedical applications. Chem Commun (Camb) 2016; 52:7528-40. [PMID: 27182032 DOI: 10.1039/c6cc03225g] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Gold coated magnetic nanoparticles (Au@MNPs) have become increasingly interesting to nanomaterial scientists due to their multifunctional properties and their potential in both analytical chemistry and nanomedicine. The past decade has seen significant progress in the synthesis and surface modification of Au@MNPs. This progress is based on advances in the preparation and characterization of iron/iron oxide nanocrystals with the required surface functional groups. In this critical review, we summarize recent developments in the methods of preparing Au@MNPs, surface functionalization and their application in analytical sensing and biomedicine. We highlight some of the remaining major challenges, as well as the lessons learnt when working with Au@MNPs.
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Affiliation(s)
- Saimon Moraes Silva
- School of Chemistry and Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia.
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6
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Choudhury MH, Ciampi S, Yang Y, Tavallaie R, Zhu Y, Zarei L, Gonçales VR, Gooding JJ. Connecting electrodes with light: one wire, many electrodes. Chem Sci 2015; 6:6769-6776. [PMID: 28757968 PMCID: PMC5508692 DOI: 10.1039/c5sc03011k] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 08/28/2015] [Indexed: 11/21/2022] Open
Abstract
The requirement of a wire to each electrode is central to the design of any electronic device but can also be a major restriction. For example it entails space restrictions and rigid device architecture in multi-electrode devices. The finite space that is taken up by the array of electrical terminals and conductive pads also severely limits the achievable density of electrodes in the device. Here it is shown that a travelling light pointer can be used to form transient electrical connections anywhere on a monolithic semiconductor electrode that is fitted with a single peripheral electrical terminal. This is achieved using hydrogen terminated silicon electrodes that are modified with well-defined organic monolayers. It is shown that electrochemical information can be either read from or written onto these surfaces. Using this concept it is possible to form devices that are equivalent to a conventional electrode array but that do not require a predetermined architecture, and where each element of the array is temporally "connected" using light stimulus; a step change in capability for electrochemistry.
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Affiliation(s)
- Moinul H Choudhury
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
| | - Simone Ciampi
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
| | - Ying Yang
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
| | - Roya Tavallaie
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
- Australian Centre for NanoMedicine , The University of New South Wales , Sydney , NSW 2052 , Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , NSW 2052 , Australia
| | - Ying Zhu
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
| | - Leila Zarei
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
| | - Vinicius R Gonçales
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
| | - J Justin Gooding
- School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia .
- Australian Centre for NanoMedicine , The University of New South Wales , Sydney , NSW 2052 , Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , The University of New South Wales , Sydney , NSW 2052 , Australia
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7
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Moraes Silva S, Tavallaie R, Tanzirul Alam M, Chuah K, Gooding JJ. A Comparison of Differently Synthesized Gold-coated Magnetic Nanoparticles as ‘Dispersible Electrodes’. ELECTROANAL 2015. [DOI: 10.1002/elan.201500530] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Saimon Moraes Silva
- School of Chemistry, Australian Centre for NanoMedicine and the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology; The University of New South Wales; Sydney 2052 Australia
| | - Roya Tavallaie
- School of Chemistry, Australian Centre for NanoMedicine and the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology; The University of New South Wales; Sydney 2052 Australia
| | - Muhammad Tanzirul Alam
- School of Chemistry, Australian Centre for NanoMedicine and the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology; The University of New South Wales; Sydney 2052 Australia
| | - Kyloon Chuah
- School of Chemistry, Australian Centre for NanoMedicine and the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology; The University of New South Wales; Sydney 2052 Australia
| | - J. Justin Gooding
- School of Chemistry, Australian Centre for NanoMedicine and the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology; The University of New South Wales; Sydney 2052 Australia
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8
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Zhang X, Li Q, Jin X, Jiang C, Lu Y, Tavallaie R, Gooding JJ. Quantitative determination of target gene with electrical sensor. Sci Rep 2015; 5:12539. [PMID: 26205714 PMCID: PMC4513347 DOI: 10.1038/srep12539] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 05/14/2015] [Indexed: 12/30/2022] Open
Abstract
Integrating loop-mediated isothermal amplification (LAMP) with capacitively coupled contactless conductivity detection (C(4)D), we have developed an electrical sensor for the simultaneous amplification and detection of specific sequence DNA. Using the O26-wzy gene as a model, the amount of initial target gene could be determined via the threshold time obtained by monitoring the progression of the LAMP reaction in real time. Using the optimal conditions, a detection limit of 12.5 copy/μL can be obtained within 30 min. Monitoring the LAMP reaction by C(4)D has not only all the advantages that existing electrochemical methods have, but also additional attractive features including being completely free of carryover contamination risk, high simplicity and extremely low cost. These benefits all arise from the fact that the electrodes are separated from the reaction solution, that is C(4)D is a contactless method. Hence in proof of principle, the new strategy promises a robust, simple, cost-effective and sensitive method for quantitative determination of a target gene, that is applicable either to specialized labs or at point-of-care.
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Affiliation(s)
- Xuzhi Zhang
- School of Chemistry and Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao 266071, P.R. China
| | - Qiufen Li
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao 266071, P.R. China
| | - Xianshi Jin
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao 266071, P.R. China
| | - Cheng Jiang
- School of Chemistry and Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Yong Lu
- School of Chemistry and Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Roya Tavallaie
- School of Chemistry and Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia
| | - J. Justin Gooding
- School of Chemistry and Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia
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9
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Das T, Kutty SK, Tavallaie R, Ibugo AI, Panchompoo J, Sehar S, Aldous L, Yeung AWS, Thomas SR, Kumar N, Gooding JJ, Manefield M. Phenazine virulence factor binding to extracellular DNA is important for Pseudomonas aeruginosa biofilm formation. Sci Rep 2015; 5:8398. [PMID: 25669133 PMCID: PMC4323658 DOI: 10.1038/srep08398] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 01/12/2015] [Indexed: 01/22/2023] Open
Abstract
Bacterial resistance to conventional antibiotics necessitates the identification of novel leads for infection control. Interference with extracellular phenomena, such as quorum sensing, extracellular DNA integrity and redox active metabolite release, represents a new frontier to control human pathogens such as Pseudomonas aeruginosa and hence reduce mortality. Here we reveal that the extracellular redox active virulence factor pyocyanin produced by P. aeruginosa binds directly to the deoxyribose-phosphate backbone of DNA and intercalates with DNA nitrogenous base pair regions. Binding results in local perturbations of the DNA double helix structure and enhanced electron transfer along the nucleic acid polymer. Pyocyanin binding to DNA also increases DNA solution viscosity. In contrast, antioxidants interacting with DNA and pyocyanin decrease DNA solution viscosity. Biofilms deficient in pyocyanin production and biofilms lacking extracellular DNA show similar architecture indicating the interaction is important in P. aeruginosa biofilm formation.
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Affiliation(s)
- Theerthankar Das
- School of Biotechnology and Biomolecular Sciences, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Samuel K Kutty
- School of Chemistry, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Roya Tavallaie
- School of Chemistry, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Amaye I Ibugo
- School of Biotechnology and Biomolecular Sciences, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Janjira Panchompoo
- School of Chemistry, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Shama Sehar
- School of Biotechnology and Biomolecular Sciences, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Leigh Aldous
- School of Chemistry, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Amanda W S Yeung
- Centre for Vascular Research and School of Medical Sciences, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Shane R Thomas
- Centre for Vascular Research and School of Medical Sciences, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Naresh Kumar
- School of Chemistry, University of New South Wales (UNSW), Sydney 2052, Australia
| | - J Justin Gooding
- School of Chemistry, University of New South Wales (UNSW), Sydney 2052, Australia
| | - Mike Manefield
- School of Biotechnology and Biomolecular Sciences, University of New South Wales (UNSW), Sydney 2052, Australia
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Tavallaie R, Darwish N, Brynn Hibbert D, Justin Gooding J. Nucleic-acid recognition interfaces: how the greater ability of RNA duplexes to bend towards the surface influences electrochemical sensor performance. Chem Commun (Camb) 2015; 51:16526-9. [DOI: 10.1039/c5cc05450h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Faster electron transfer kinetics were observed for redox labelled nucleic-acids duplexes containing RNA, suggesting a more flexibility, compared to DNA/DNA.
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Affiliation(s)
- Roya Tavallaie
- School of Chemistry
- The University of New South Wales
- Sydney
- Australia
- Australian Centre for NanoMedicine
| | - Nadim Darwish
- School of Chemistry
- The University of New South Wales
- Sydney
- Australia
| | - D. Brynn Hibbert
- School of Chemistry
- The University of New South Wales
- Sydney
- Australia
| | - J. Justin Gooding
- School of Chemistry
- The University of New South Wales
- Sydney
- Australia
- Australian Centre for NanoMedicine
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11
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Tavallaie R, De Almeida SRM, Gooding JJ. Toward biosensors for the detection of circulating microRNA as a cancer biomarker: an overview of the challenges and successes. WIREs Nanomed Nanobiotechnol 2014; 7:580-92. [DOI: 10.1002/wnan.1324] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 09/09/2014] [Accepted: 10/29/2014] [Indexed: 01/07/2023]
Affiliation(s)
- Roya Tavallaie
- School of Chemistry, Australian Centre for NanoMedicine and ARC Centre of Excellence for Bio-Nano Science and Technology; The University of New South Wales; Sydney NSW Australia
| | - Swahnnya R. M. De Almeida
- School of Chemistry, Australian Centre for NanoMedicine and ARC Centre of Excellence for Bio-Nano Science and Technology; The University of New South Wales; Sydney NSW Australia
| | - J. Justin Gooding
- School of Chemistry, Australian Centre for NanoMedicine and ARC Centre of Excellence for Bio-Nano Science and Technology; The University of New South Wales; Sydney NSW Australia
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12
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Tavallaie R, Darwish N, Gebala M, Hibbert DB, Gooding JJ. The Effect of Interfacial Design on the Electrochemical Detection of DNA and MicroRNA Using Methylene Blue at Low-Density DNA Films. ChemElectroChem 2013. [DOI: 10.1002/celc.201300136] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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13
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Tavallaie R, Talebpour Z, Azad J, Soudi MR. Simultaneous determination of pyruvate and acetate levels in xanthan biopolymer by infrared spectroscopy: effect of spectral pre-processing for solid-state analysis. Food Chem 2011. [DOI: 10.1016/j.foodchem.2010.07.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Talebpour Z, Tavallaie R, Ahmadi SH, Abdollahpour A. Simultaneous determination of penicillin G salts by infrared spectroscopy: Evaluation of combining orthogonal signal correction with radial basis function-partial least squares regression. Spectrochim Acta A Mol Biomol Spectrosc 2010; 76:452-457. [PMID: 20472492 DOI: 10.1016/j.saa.2010.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2009] [Revised: 01/04/2010] [Accepted: 01/08/2010] [Indexed: 05/29/2023]
Abstract
In this study, a new method for the simultaneous determination of penicillin G salts in pharmaceutical mixture via FT-IR spectroscopy combined with chemometrics was investigated. The mixture of penicillin G salts is a complex system due to similar analytical characteristics of components. Partial least squares (PLS) and radial basis function-partial least squares (RBF-PLS) were used to develop the linear and nonlinear relation between spectra and components, respectively. The orthogonal signal correction (OSC) preprocessing method was used to correct unexpected information, such as spectral overlapping and scattering effects. In order to compare the influence of OSC on PLS and RBF-PLS models, the optimal linear (PLS) and nonlinear (RBF-PLS) models based on conventional and OSC preprocessed spectra were established and compared. The obtained results demonstrated that OSC clearly enhanced the performance of both RBF-PLS and PLS calibration models. Also in the case of some nonlinear relation between spectra and component, OSC-RBF-PLS gave satisfactory results than OSC-PLS model which indicated that the OSC was helpful to remove extrinsic deviations from linearity without elimination of nonlinear information related to component. The chemometric models were tested on an external dataset and finally applied to the analysis commercialized injection product of penicillin G salts.
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Affiliation(s)
- Zahra Talebpour
- Department of Chemistry, Faculty of Science, Alzahra University, Vanak, Tehran, Iran.
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