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A sequential toggle cell-SELEX DNA aptamer for targeting Staphylococcus aureus, Streptococcus agalactiae, and Escherichia coli bacteria. J Genet Eng Biotechnol 2022; 20:95. [PMID: 35776386 PMCID: PMC9249959 DOI: 10.1186/s43141-022-00374-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 06/02/2022] [Indexed: 12/26/2022]
Abstract
BACKGROUND Mastitis is an inflammation of the mammary glands caused by a microbial infection. The common bacteria causing this infection in dairy farms are Staphylococcus aureus, Streptococcus agalactiae, and Escherichia coli. The aptamer is a new biosensor platform for detecting pathogens; however, its use for simultaneous detection of S. aureus, S. agalactiae, and E. coli bacteria has not been reported. This study's objective is to isolate and characterize polyclonal DNA aptamer with broad reactivity to the mastitis bacteria S. aureus, S. agalactiae, and E. coli using a sequential toggle cell-SELEX. METHODS AND RESULTS The DNA aptamer pool from SELEX 15 was inserted into the pGEM-T easy plasmid. Furthermore, the transformant clones were selected by PCR colony, plasmid isolation, and sequencing. Six DNA aptamers, consisting of S15K3, S15K4, S15K6, S15K13, S15K15, and S15K20 with a constant region and the right size of 81 bp were derived from the sequencing analysis. The secondary structure of the DNA was predicted using Mfold software. The DNA was analyzed with binding characteristics, including binding capacity and affinity (Kd), using qPCR. The results indicated aptamer S15K15 has the highest binding ability into S. agalactiae, while S15K13 performed binding capacity most to E. coli EPEC 4, and S15K3 has the highest capacity of binding to S. aureus BPA-12. CONCLUSION Aptamer S15K3 has the best binding characteristics on all three bacterial targets.
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Assays to Estimate the Binding Affinity of Aptamers. Talanta 2022; 238:122971. [PMID: 34857318 DOI: 10.1016/j.talanta.2021.122971] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 10/10/2021] [Accepted: 10/12/2021] [Indexed: 02/07/2023]
Abstract
Aptamers have become coming-of-age molecular recognition elements in both diagnostic and therapeutic applications. Generated by SELEX, the 'quality control' of aptamers, which involves the validation of their binding affinity against their respective targets is pivotal to ascertain their potency prior to use in any downstream assays or applications. Several aptamers have been isolated thus far, however, the usage of inappropriate validation assays renders some of these aptamers dubitable in terms of their binding capabilities. Driven by this need, we provide an up-to-date critical review of the various strategies used to determine the aptamer-target binding affinity with the aim of providing researchers a better comprehension of the different analytical approaches in respect to the molecular properties of aptamers and their intended targets. The techniques reported have been classified as label-based techniques such as fluorescence intensity, fluorescence anisotropy, filter-binding assays, gel shift assays, ELISA; and label-free techniques such as UV-Vis spectroscopy, circular dichroism, isothermal titration calorimetry, native electrospray ionization-mass spectrometry, quartz crystal microbalance, surface plasmon resonance, NECEEM, backscattering interferometry, capillary electrophoresis, HPLC, and nanoparticle aggregation assays. Hybrid strategies combining the characteristics of both categories such as microscale thermophoresis have been also additionally emphasized. The fundamental principles, complexity, benefits, and challenges under each technique are elaborated in detail.
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Binding Characteristics Study of DNA based Aptamers for E. coli O157:H7. Molecules 2021; 26:molecules26010204. [PMID: 33401561 PMCID: PMC7795876 DOI: 10.3390/molecules26010204] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/21/2020] [Accepted: 12/29/2020] [Indexed: 01/29/2023] Open
Abstract
E. coli O157:H7 is a pathogenic bacterium producing verotoxins that could lead to serious complications such as hemolytic uremia syndrome. Fast detection of such pathogens is important. For rapid detection, aptamers are quickly gaining traction as alternative biorecognition molecules besides conventional antibodies. Several DNA aptamers have been selected for E. coli O157:H7. Nonetheless, there has not been a comparative study of the binding characteristics of these aptamers. In this work, we present a comprehensive analysis of binding characteristics including binding affinity (Kd) and binding capacity (Bmax) of DNA-based aptamers for E. coli O157:H7 using qPCR. Our results show that aptamer E18R has the highest binding capacity to E. coli 157:H7 and the highest specificity over non-pathogenic E. coli strains K12 and DH5α. Our study also finds that the common biotin-tag modification at 5' end typically changes the binding capacity significantly. For most of the selected aptamers, the binding capacity after a biotin-tag modification decreases. There exists a discrepancy in the binding capability between the selected aptamer and the aptamer used for detection. Our study also shows that a lower concentration of Mg2+ ions in the binding buffer leads to a decrease in the binding capacity of E17F and E18R, while it does not affect the binding capacity of S1 and EcoR1.
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Yuan Z, Xu P, Yu F, Zhang D, Zhao Q, Yu W, Wang H. An electroosmotic flow-free two-direction migration strategy enables fast affinity capillary electrophoresis to study the weak interactions between basic peptides and RNA. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:5833-5838. [PMID: 33227112 DOI: 10.1039/d0ay01515f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Affinity Capillary Electrophoresis (ACE) is a useful analytical tool to study noncovalent interactions. However, it remains challenging for ACE to measure weak and unstable interactions due to the fast dissociation of the binding complex and the possible destruction of the complex by a high electric field. In this study, we proposed a two-direction migration strategy that enables ACE to detect weak and unstable but important interactions by decreasing the migration distance of the binding complex and controlling the opposite migration direction of the free probe. By synthesizing a polyacrylamide-coated neutral capillary, free of electroosmotic flow, two-direction CE migration of basic peptides (positively charged) and peptide-RNA complexes (negatively charged) was achieved. Furthermore, the weak interactions between small nuclear U2 RNA and histone peptides were detected by this two-direction migration CE approach. The effects of the methylation states of histone peptides on the weak peptide-RNA interactions were also explored by this new approach. Collectively, the suggested modification of the ACE method is able to qualitatively characterize weak interactions.
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Affiliation(s)
- Zheng Yuan
- The State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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DNA-crosslinked alginate and layered microspheres to modulate the release of encapsulated FITC-dextran. Eur J Pharm Biopharm 2020; 158:313-322. [PMID: 33259898 DOI: 10.1016/j.ejpb.2020.11.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 12/18/2022]
Abstract
Alginate can be gently crosslinked by calcium into hydrogels and microspheres for the encapsulation and release of proteins and drugs. However, the release is often over short periods unless alginate is also covalently modified or crosslinked. This research aims to sustain the release of encapsulated model drug FITC-dextran by covalently crosslinking alginate with short oligomers DNA because evidence suggests that DNA may also interact with alginate to further increase effective crosslinking. Furthermore, modulating the release of drugs from alginate in response to specific proteins could tailor release profiles to improve patient treatment. This research develops a DNA-crosslinked alginate hydrogel and layered alginate microspheres to encapsulate and then sustain the release FITC-dextran (model drug). An aptamer sequence to hen egg-white lysozyme is included in one DNA strand to allow for the disruption of the crosslinks by interactions with human lysozyme. Alginate was covalently modified with complementary strands of DNA to crosslink the alginate into hydrogels, which had increased crosslinking density when re-swollen (in comparison to controls crosslinked with PEG) and could sustained the release of encapsulated FITC-dextran. When an aptamer sequence for hen lysozyme was included in the DNA crosslinks, the hydrogels decrosslinked when incubated in human lysozyme for 60 days. In addition, calcium alginate microspheres were coated with 3 alternating layers of poly-Lysine, DNA-crosslinked alginate, and poly-L-lysine. FITC-dextran loaded into the microspheres released in a sustained manner past 30 days (into PBS at 37 °C) and would likely continue to release for far longer had the studies continued. When incubated with 3 μM of human lysozyme, a burst release of FITC-dextran occurred from both the hydrogels and microspheres, with no changes in the controls. The increased release was in bursts followed by similar sustained release rates suggesting that the human lysozyme temporarily disrupted the DNA crosslinks which were then re-established or were influenced by interactions between DNA and alginate. Importantly, covalently bound complementary strands of DNA could crosslink the alginate and additional interactions appeared to further sustain the release of encapsulated therapeutics.
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Multiple Zones Modification of Open Off-Stoichiometry Thiol-Ene Microchannel by Aptamers: A Methodological Study & A Proof of Concept. CHEMOSENSORS 2020. [DOI: 10.3390/chemosensors8020024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Off-stoichiometry thiol-ene polymer (OSTE) is an emerging thermoset with interesting properties for the development of lab-on-a-chip (LOAC), such as easy microfabrication process, suitable surface chemistry for modification and UV-transparency. One of the challenges for LOAC development is the integration of all the analytical steps in one microchannel, and particularly, trace level analytes extraction/preconcentration steps. In this study, two strategies for the immobilization of efficient tools for this purpose, thiol-modified (C3-SH) aptamers, on OSTE polymer surfaces were developed and compared. The first approach relies on a direct UV-initiated click chemistry reaction to graft thiol-terminated aptamers on ene-terminated OSTE surfaces. The second strategy consists of the immobilization of thiol-terminated aptamers onto OSTE substrates covered by gold nanoparticles. The presence of an intermediate gold nanoparticle layer on OSTE has shown great interest in the efficient immobilization of aptamers, preserving their interaction with the target, and preventing non-specific adsorption. With this second innovative strategy, we proved, for the first time the concept of creating multiple functional zones for sample treatment in an open OSTE-microchannel thanks to the immobilization of aptamers in consecutive areas by the simple droplet deposition methodology. This methodological development allows further consideration of OSTE material for lab-on-a-chip designs, integrating multiple zones for sample pretreatment, based on molecular recognition by ligands, such as aptamers, in a specific zone of the microchannel and is adaptable to a large range of analytical applications for LOAC industrialization.
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Lai SN, Zhou X, Ouyang X, Zhou H, Liang Y, Xia J, Zheng B. Artificial Cells Capable of Long-Lived Protein Synthesis by Using Aptamer Grafted Polymer Hydrogel. ACS Synth Biol 2020; 9:76-83. [PMID: 31880928 DOI: 10.1021/acssynbio.9b00338] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Herein we report a new type of artificial cells capable of long-term protein expression and regulation. We constructed the artificial cells by grafting anti-His-tag aptamer into the polymer backbone of the hydrogel particles, and then immobilizing the His-tagged proteinaceous factors of the transcription and translation system into the hydrogel particles. Long-term protein expression for at least 16 days was achieved by continuously flowing feeding buffer through the artificial cells. The effect of various metal ions on the protein expression in the artificial cells was investigated. Utilizing the lac operator-repressor system, we could regulate the expression level of eGFP in the artificial cells by controlling the β-D-1-thiogalatopyranoside (IPTG) concentration in the feeding buffer. The artificial cells based on the aptamer grafted hydrogel provide a useful platform for gene circuit engineering, metabolic engineering, drug delivery, and biosensors.
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Affiliation(s)
- Sze Nga Lai
- Department of Chemistry , The Chinese University of Hong Kong , Sha Tin , Hong Kong
| | - Xiaoyu Zhou
- Department of Chemistry , The Chinese University of Hong Kong , Sha Tin , Hong Kong
- Department of Biomedical Sciences , City University of Hong Kong , 83 Tat Chee Avenue , Kowloon , Hong Kong
| | - Xiaofei Ouyang
- Department of Chemistry , The Chinese University of Hong Kong , Sha Tin , Hong Kong
| | - Hui Zhou
- Department of Chemistry , The Chinese University of Hong Kong , Sha Tin , Hong Kong
| | - Yujie Liang
- Department of Chemistry , The Chinese University of Hong Kong , Sha Tin , Hong Kong
| | - Jiang Xia
- Department of Chemistry , The Chinese University of Hong Kong , Sha Tin , Hong Kong
| | - Bo Zheng
- Department of Chemistry , The Chinese University of Hong Kong , Sha Tin , Hong Kong
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Yu N, Wu J. Rapid and reagentless detection of thrombin in clinic samples via microfluidic aptasensors with multiple target-binding sites. Biosens Bioelectron 2019; 146:111726. [PMID: 31586758 DOI: 10.1016/j.bios.2019.111726] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 09/18/2019] [Accepted: 09/20/2019] [Indexed: 01/11/2023]
Abstract
A reusable and straightforward aptasensor with the implementation of open-ended porous silicon (OEPSi) membranes was introduced for thrombin detection. When passing through the nanochannels of OEPSi integrated in a microfluidic cell, thrombin in sample solution could be captured by thrombin-binding aptamers (TBA) immobilized along the inner walls. The formation of thrombin-aptamer complex causes refractive index changes which can be measured by reflective interferometric Fourier transform spectroscopy (RIFTS). And this flow-through configuration with OEPSi has proven more efficient in capturing thrombin than the flow-over configuration with closed-ended PSi. For higher sensitivity, we investigated how the pore size, ionic strength, pH and aptamers affected the thrombin-aptamer interaction in nanopores. Under optimized conditions, the limits of detection (LOD) for thrombin detection in the buffer and serum were ∼6.70 nM and ∼8.21 nM respectively and a wide linear detection range (10-1000 nM) was observed. More importantly, this work reveals the sensitivity of the label-free biosensor can be significantly improved by attaching newly designed aptamers with two thrombin-binding sites. This phenomenon also indicates the potential of aptamer probes in adjusting effective pore size and enhancing the interaction between aptamers and targets through meticulous sequence design. Furthermore, the proposed strategy has been applied in thrombin detection in clinic samples successfully, which was verified by Enzyme-Linked Immunosorbent Assays (ELISA).
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Affiliation(s)
- Neng Yu
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China
| | - Jianmin Wu
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China.
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Sadeghi AS, Mohsenzadeh M, Abnous K, Taghdisi SM, Ramezani M. Development and characterization of DNA aptamers against florfenicol: Fabrication of a sensitive fluorescent aptasensor for specific detection of florfenicol in milk. Talanta 2018; 182:193-201. [PMID: 29501140 DOI: 10.1016/j.talanta.2018.01.083] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 01/25/2018] [Accepted: 01/29/2018] [Indexed: 01/05/2023]
Abstract
Specific ssDNA aptamers for the antibiotic florfenicol (FF) were developed from an enriched nucleotide library using magnetic beads-based SELEX (Systematic Evolution of Ligands by EXponential enrichment) technique with high-binding affinity. After 12 rounds of selection, thirty-six sequences were obtained that were then divided into five major families, according to the primary sequence similarity. Binding affinity analyses of three fluorescently tagged aptamers belonging to different families demonstrated that the dissociation constants (Kd) were in the low nanomolar range (Kd = 52.78-211.4 nmol L-1). Furthermore, to verify the potential application of the aptamers, a fluorescent aptasensor was fabricated for detecting the FF residue in raw milk samples based on the energy transfer between graphene oxide as the acceptor and fluorescently tagged FF-specific aptamer as the donor. Under optimal conditions, the aptasensor displayed a wide linear range from 5 to 1200 nmol L-1 and a detection limit of 5.75 nmol L-1 with excellent selectivity in milk. The recovery rate in the milk was between 101% ± 0.14% and 110% ± 2.8%, indicating high accuracy. This fluorescent aptasensor possessed considerable potential for rapid analysis of FF in raw milk because of its simplicity of detection. Moreover, the interaction between the aptamer and FF was studied using molecular modeling.
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Affiliation(s)
- Atefeh Sarafan Sadeghi
- Department of Food Hygiene and Aquaculture, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Mohsenzadeh
- Department of Food Hygiene and Aquaculture, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
| | - Khalil Abnous
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyed Mohammad Taghdisi
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Pharmaceutical Biotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Ramezani
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Pharmaceutical Biotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
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Tan SY, Acquah C, Sidhu A, Ongkudon CM, Yon LS, Danquah MK. SELEX Modifications and Bioanalytical Techniques for Aptamer-Target Binding Characterization. Crit Rev Anal Chem 2016; 46:521-37. [PMID: 26980177 DOI: 10.1080/10408347.2016.1157014] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The quest to improve the detection of biomolecules and cells in health and life sciences has led to the discovery and characterization of various affinity bioprobes. Libraries of synthetic oligonucleotides (ssDNA/ssRNA) with randomized sequences are employed during Systematic Evolution of Ligands by Exponential Enrichment (SELEX) to select highly specific affinity probes called aptamers. With much focus on the generation of aptamers for a variety of target molecules, conventional SELEX protocols have been modified to develop new and improved SELEX protocols yielding highly specific and stable aptamers. Various techniques have been used to analyze the binding interactions between aptamers and their cognate molecules with associated merits and limitations. This article comprehensively reviews research advancements in the generation of aptamers, analyses physicochemical conditions affecting their binding characteristics to cellular and biomolecular targets, and discusses various field applications of aptameric binding. Biophysical techniques employed in the characterization of the molecular and binding features of aptamers to their cognate targets are also discussed.
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Affiliation(s)
- Sze Y Tan
- a Department of Chemical Engineering , Curtin University , Sarawak , Malaysia.,b Curtin Sarawak Research Institute , Curtin University , Sarawak , Malaysia
| | - Caleb Acquah
- a Department of Chemical Engineering , Curtin University , Sarawak , Malaysia.,b Curtin Sarawak Research Institute , Curtin University , Sarawak , Malaysia
| | - Amandeep Sidhu
- b Curtin Sarawak Research Institute , Curtin University , Sarawak , Malaysia.,c Faculty of Health Sciences , Curtin University , Perth , Australia
| | - Clarence M Ongkudon
- d Biotechnology Research Institute , University Malaysia Sabah , Kota Kinabalu , Sabah , Malaysia
| | - L S Yon
- a Department of Chemical Engineering , Curtin University , Sarawak , Malaysia
| | - Michael K Danquah
- a Department of Chemical Engineering , Curtin University , Sarawak , Malaysia.,b Curtin Sarawak Research Institute , Curtin University , Sarawak , Malaysia
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Durney BC, Crihfield CL, Holland LA. Capillary electrophoresis applied to DNA: determining and harnessing sequence and structure to advance bioanalyses (2009-2014). Anal Bioanal Chem 2015; 407:6923-38. [PMID: 25935677 PMCID: PMC4551542 DOI: 10.1007/s00216-015-8703-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 04/09/2015] [Accepted: 04/13/2015] [Indexed: 12/17/2022]
Abstract
This review of capillary electrophoresis methods for DNA analyses covers critical advances from 2009 to 2014, referencing 184 citations. Separation mechanisms based on free-zone capillary electrophoresis, Ogston sieving, and reptation are described. Two prevalent gel matrices for gel-facilitated sieving, which are linear polyacrylamide and polydimethylacrylamide, are compared in terms of performance, cost, viscosity, and passivation of electroosmotic flow. The role of capillary electrophoresis in the discovery, design, and characterization of DNA aptamers for molecular recognition is discussed. Expanding and emerging techniques in the field are also highlighted.
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Affiliation(s)
- Brandon C Durney
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA
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Hünniger T, Fischer C, Wessels H, Hoffmann A, Paschke-Kratzin A, Haase I, Fischer M. Food sensing: selection and characterization of DNA aptamers to Alicyclobacillus spores for trapping and detection from orange juice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:2189-2197. [PMID: 25639310 DOI: 10.1021/jf505996m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The quality of the beverage industry's products has to be constantly monitored to fulfill consumers' high expectations. The thermo-acidophilic Gram-positive Alicyclobacillus spp. are not pathogenic, but their heat-resistant endospores can survive juice-processing conditions and have become a major economic concern for the fruit juice industry. Current detection methods rely on cultivation, isolation, and organism identification, which can take up to a week, resulting in economic loss. This work presents the selection and identification of DNA aptamers targeting Alicyclobacillus spores by spore-SELEX (systematic evolution of ligands by exponential enrichment) in orange-juice-simulating buffer. The selection process was verified by various techniques, including flow cytometric binding assays, radioactive binding assays, and agarose gel electrophoresis. The subsequent aptamer characterization included the determination of dissociations constants and selectivity by different techniques, such as surface plasmon resonance spectroscopy and fluorescence microscopy. In summary, 10 different aptamers with an affinity to Alicyclobacillus spp. have been developed, analyzed, and characterized in terms of affinity and specificity.
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Affiliation(s)
- Tim Hünniger
- Hamburg School of Food Science, Institute of Food Chemistry, University of Hamburg , Grindelallee 117, 20146 Hamburg, Germany
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Vermet G, Degoutin S, Chai F, Maton M, Bria M, Danel C, Hildebrand HF, Blanchemain N, Martel B. Visceral mesh modified with cyclodextrin for the local sustained delivery of ropivacaine. Int J Pharm 2014; 476:149-59. [PMID: 25275939 DOI: 10.1016/j.ijpharm.2014.09.042] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 09/23/2014] [Accepted: 09/26/2014] [Indexed: 11/26/2022]
Abstract
The aim of the study was to develop a polyester visceral implant modified with a cyclodextrin polymer for the local and prolonged delivery of ropivacaine to reduce post operatory pain. Therefore, we applied a coating of an inguinal mesh with a crosslinked polymer of hydroxypropyl-β-cyclodextrin (HPβCD) whose specific host-guest complex forming properties were expected to improve the adsorption capacity of the implant toward anesthetic, and then to release it within a sustained period. The modification reaction of the textile with cyclodextrin was explored through the study of the influence of the pad/dry/cure process parameters and the resulting implant (PET-CD) was characterized by solid state NMR and SEM. Besides, the inclusion complex between ropivacaine and CD was studied by NMR and capillary electrophoresis in PBS medium. Finally, ropivacaine sorption test showed that a maximum of 30 mg/g of ropivacaine could be adsorbed on the functionalized samples. In dynamic batch tests in PBS at pH 7.4, the release could be observed up to 6h. The cytocompatibility of the PET-CD loaded with ropivacaine was also studied and reached 65% cell vitality after 6 days.
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Affiliation(s)
- G Vermet
- Unité Matériaux Et Transformations (UMET), Université Lille 1, 59655 Villeneuve d'Ascq, France; Cousin Biotech, 59117 Wervicq-Sud, France
| | - S Degoutin
- Unité Matériaux Et Transformations (UMET), Université Lille 1, 59655 Villeneuve d'Ascq, France.
| | - F Chai
- INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, Université Lille 2, 59006 Lille, France
| | - M Maton
- INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, Université Lille 2, 59006 Lille, France
| | - M Bria
- Centre Commun de Mesures RMN, Université Lille 1, 59655 Villeneuve d'Ascq, France
| | - C Danel
- UDSL, Laboratoire de Chimie Analytique EA 4481, Université Lille 2, 59000 Lille, France
| | - H F Hildebrand
- INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, Université Lille 2, 59006 Lille, France
| | - N Blanchemain
- INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, Université Lille 2, 59006 Lille, France
| | - B Martel
- Unité Matériaux Et Transformations (UMET), Université Lille 1, 59655 Villeneuve d'Ascq, France
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Kim CH, Lee LP, Min JR, Lim MW, Jeong SH. An indirect competitive assay-based aptasensor for detection of oxytetracycline in milk. Biosens Bioelectron 2013; 51:426-30. [PMID: 24011458 DOI: 10.1016/j.bios.2013.08.003] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 08/03/2013] [Accepted: 08/05/2013] [Indexed: 02/06/2023]
Abstract
Oxytetracycline (OTC) is a common antibacterial agent used for the control of animal diseases. OTC abuse can seriously affect human health; therefore, we developed a biosensor using single-stranded DNA (ssDNA) aptamers for the detection of OTC. The binding probe aptamers for OTC were selected by a Systematic Evolution of Ligands by the exponential enrichment (SELEX) process and identified by the enzyme-linked aptamer assay (ELAA). Among the selected 5 aptamers, aptamer OTC3 showed the strongest affinity (Kd=4.7 nM) and highest specificity for OTC compared to structurally similar antibiotics, tetracycline and chlortetracycline. OTC was detected using indirect competitive ELAA. The limit of detection and quantitation with aptamer OTC3 were 12.3 and 49.8 µg/L, respectively, in milk and showed recovery rates of more than 90% in OTC-spiked milk. This biosensor method with high sensitivity and specificity based on indirect competitive ELAA can be applied to OTC detection in food products on-site because of the simplicity of detection.
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Affiliation(s)
- Chong-Han Kim
- Department of Bio Applied Toxicology, Hoseo Toxicology Research Center, Hoseo University, Asan 336-795, South Korea
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Radom F, Jurek PM, Mazurek MP, Otlewski J, Jeleń F. Aptamers: molecules of great potential. Biotechnol Adv 2013; 31:1260-74. [PMID: 23632375 DOI: 10.1016/j.biotechadv.2013.04.007] [Citation(s) in RCA: 136] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 03/27/2013] [Accepted: 04/19/2013] [Indexed: 01/08/2023]
Abstract
Aptamers emerged over 20 years ago as a class of nucleic acids able to recognize specific targets. Today, aptamer-related studies constitute a large and important field of biotechnology. Functional oligonucleotides have proved to be a versatile tool in biomedical research due to the ease of synthesis, a wide range of potentially recognized molecular targets and the simplicity of selection. Similarly to antibodies, aptamers can be used to detect or isolate specific molecules, as well as to act as targeting and therapeutic agents. In this review we present different approaches to aptamer application in nanobiotechnology, diagnostics and medicine.
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Affiliation(s)
- Filip Radom
- Department of Protein Engineering, Faculty of Biotechnology, University of Wroclaw, Tamka 2, 50-137 Wroclaw, Poland
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Miszczak A, Rosłon M, Zbroja G, Brama K, Szalacha E, Gawrońska H, Pawlak K. SEC ICP MS and CZE ICP MS investigation of medium and high molecular weight complexes formed by cadmium ions with phytochelatins. Anal Bioanal Chem 2013; 405:4667-78. [PMID: 23525539 PMCID: PMC3637892 DOI: 10.1007/s00216-013-6868-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 02/18/2013] [Accepted: 02/24/2013] [Indexed: 11/06/2022]
Abstract
Size-exclusion chromatography (SEC) and capillary zone electrophoresis (CZE) coupled with inductively coupled plasma mass spectrometry were applied to characterize low, medium, and high molecular weight cadmium complexes with glutathione and phytochelatins (PCs). The dominant stoichiometry of the complexes formed in vitro was established as 1:1 using electrospray ionization mass spectrometry. Calculated molecular masses of Cd1L1 complexes were used for calibration of the SEC and CZE methods. The results showed a lower (2 kDa) SEC column exclusion limit for cadmium complexes compared with free peptides (10 kDa), and most of the high molecular weight cadmium species were eluted in the void volume of the column. Moreover, the CZE method based on the semiempirical model of Offord to elucidate peptide migration allowed us to show a high propensity of Cd–PC complexes for polymorphism on complexation, which was also observed for extracts of Arabidopsis thaliana treated with cadmium. All the information presented is vital for understanding the mechanism of metal deactivation in plants. Estimation of molecular mass of Cd-thiopeptide complexes by size electrophoretic mobility ![]()
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Affiliation(s)
- Agata Miszczak
- Chair of Analytical Chemistry, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland
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18
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Girardot M, Li H, Descroix S, Varenne A. Aptamer–Target Interaction: A Comprehensive Study by Microchip Electrophoresis in Frontal Mode. Chromatographia 2012. [DOI: 10.1007/s10337-012-2346-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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19
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Deng QP, Tie C, Zhou YL, Zhang XX. Cocaine detection by structure-switch aptamer-based capillary zone electrophoresis. Electrophoresis 2012; 33:1465-70. [PMID: 22648816 DOI: 10.1002/elps.201100680] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Aptamers, which are nucleic acid oligonucleotides that can bind targets with high affinity and specificity, have been widely applied as affinity probes in capillary electrophoresis (CE). Due to relative weak interaction between aptamers and small molecules, the application of aptamer-based CE is still limited in certain compounds. A new strategy that is based on the aptamer structure-switch concept was designed for small molecule detection by a novel CE method. A carboxyfluorescein (fluorescein amidite, FAM) label DNA aptamer was first incubated with partial complementary strand (CS), and then the free aptamer and the aptamer-CS duplex were well separated and determined by metal cation mediated CE/laser-induced fluorescence. When the target was introduced into the incubated sample, the hybridized form was destabilized, resulting in the changes of the fluorescence intensities of the free aptamer and the aptamer-CS duplex. The length of CS was investigated and 12 mer CS showed the best sensitivity for the detection of cocaine. The presented CE-LIF method, which combines the separation power of CE with the specificity of interactions occurring between target, aptamer, and CS, could be a universal detection strategy for other aptamer-specified small molecules.
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Affiliation(s)
- Qin-Pei Deng
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry, Peking University, Beijing, China
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20
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Sun J, He B, Liu Q, Ruan T, Jiang G. Characterization of interactions between organotin compounds and human serum albumin by capillary electrophoresis coupled with inductively coupled plasma mass spectrometry. Talanta 2012; 93:239-44. [DOI: 10.1016/j.talanta.2012.02.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Revised: 02/05/2012] [Accepted: 02/10/2012] [Indexed: 11/25/2022]
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21
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Capillary electrophoresis–inductively coupled plasma-mass spectrometry hyphenation for the determination at the nanogram scale of metal affinities and binding constants of phosphorylated ligands. J Chromatogr A 2012; 1229:280-7. [DOI: 10.1016/j.chroma.2012.01.066] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 01/20/2012] [Accepted: 01/23/2012] [Indexed: 11/20/2022]
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Affiliation(s)
- Matthew Geiger
- University of Minnesota, Department of Chemistry, 207
Pleasant Street South East, Minneapolis, Minnesota 55455, United States
| | - Amy L. Hogerton
- University of Minnesota, Department of Chemistry, 207
Pleasant Street South East, Minneapolis, Minnesota 55455, United States
| | - Michael T. Bowser
- University of Minnesota, Department of Chemistry, 207
Pleasant Street South East, Minneapolis, Minnesota 55455, United States
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23
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Kubáň P, Timerbaev AR. CE of inorganic species - A review of methodological advancements over 2009-2010. Electrophoresis 2011; 33:196-210. [DOI: 10.1002/elps.201100357] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2011] [Revised: 07/30/2011] [Accepted: 07/30/2011] [Indexed: 01/13/2023]
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24
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Affiliation(s)
- Anton B. Iliuk
- Department of Biochemistry and Purdue Center for Cancer Research, Purdue University, West Lafayette, IN 47907
| | - Lianghai Hu
- Department of Biochemistry and Purdue Center for Cancer Research, Purdue University, West Lafayette, IN 47907
| | - W. Andy Tao
- Department of Biochemistry and Purdue Center for Cancer Research, Purdue University, West Lafayette, IN 47907
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25
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Determination of binding parameters between lysozyme and its aptamer by frontal analysis continuous microchip electrophoresis (FACMCE). J Chromatogr A 2011; 1218:4052-8. [PMID: 21616496 DOI: 10.1016/j.chroma.2011.04.077] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 04/22/2011] [Accepted: 04/27/2011] [Indexed: 11/24/2022]
Abstract
An original and simple methodology based on microchip electrophoresis (MCE) in a continuous frontal analysis mode (named frontal analysis continuous microchip electrophoresis, FACMCE) was developed for the simultaneous determination of the binding parameters, i.e. ligand-site dissociation constant (k(d)) and number of binding sites on the substrate (n). This simultaneous determination was exemplified with the interaction between an aptamer and its target. The selected target is a strongly basic protein, lysozyme, as its quantification is of great interest due to its antimicrobial and allergenic properties. A glass microdevice equipped with a fluorescence detection system was coated with hydroxypropylcellulose, reducing the electroosmotic flow and adsorption onto the channel walls. This microdevice allowed the continuous electrokinetic injection of a mixture of fluorescently labelled aptamer and non-labelled lysozyme. By determining the concentration of the free fluorescently labelled aptamer thanks to its corresponding plateau height, mathematical linearization methods allowed to determine a k(d) value of 48.4±8.0 nM, consistent with reported results (31 nM), while the average number of binding sites n on lysozyme, never determined before, was 0.16±0.03. These results seem to indicate that the buffer nature and the SELEX process should influence the number and affinity of the binding sites. In parallel it has been shown that the binding between lysozyme and its aptamer presents two sites of different binding affinities.
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Potty ASR, Kourentzi K, Fang H, Schuck P, Willson RC. Biophysical characterization of DNA and RNA aptamer interactions with hen egg lysozyme. Int J Biol Macromol 2010; 48:392-7. [PMID: 21167858 DOI: 10.1016/j.ijbiomac.2010.12.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 12/03/2010] [Accepted: 12/08/2010] [Indexed: 01/24/2023]
Abstract
This work characterized the binding of an RNA aptamer recognizing hen egg white lysozyme, as well as a literature-reported single-stranded DNA analog of sequence identical to the original RNA aptamer, using fluorescence anisotropy, isothermal titration calorimetry (ITC) and analytical ultracentrifugation. The polyanionic DNA aptamer analog is selective for lysozyme even over cationic cytochrome c and has been reported to be successfully used in biosensing applications. The association however, is predominantly of electrostatic character, strongly salt-sensitive and entropically-driven, in contrast to previously described enthalpically-driven antibody-lysozyme and DNA aptamer-VEGF interactions. With a moderate selectivity for their target, high salt-sensitivity along with fast association and dissociation behavior, these molecules might serve as pseudo-affinity ligands for biomolecular separations.
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Affiliation(s)
- Ajish S R Potty
- Department of Chemical & Biomolecular Engineering, University of Houston, 4800 Calhoun Rd, Houston, TX 77204-4004, USA
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