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Pandey R, Lu Y, McConnell EM, Osman E, Scott A, Gu J, Hoare T, Soleymani L, Li Y. Electrochemical DNAzyme-based biosensors for disease diagnosis. Biosens Bioelectron 2023; 224:114983. [PMID: 36640547 DOI: 10.1016/j.bios.2022.114983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 11/28/2022] [Accepted: 11/30/2022] [Indexed: 01/01/2023]
Abstract
DNAzyme-based electrochemical biosensors provide exceptional analytical sensitivity and high target recognition specificity for disease diagnosis. This review provides a critical perspective on the fundamental and applied impact of incorporating DNAzymes in the field of electrochemical biosensing. Specifically, we highlight recent advances in creating DNAzyme-based electrochemical biosensors for diagnosing infectious diseases, cancer and regulatory diseases. We also develop an understanding of challenges around translating the research in the field of DNAzyme-based electrochemical biosensors from labs to clinics, followed by a discussion on different strategies that can be applied to enhance the performance of the currently existing technologies to create truly point-of-care electrochemical DNAzyme biosensors.
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Affiliation(s)
- Richa Pandey
- Department of Engineering Physics, McMaster University, Hamilton, Ontario, L8S 4K1, Canada; Department of Biomedical Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada.
| | - Yang Lu
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, L8S 4K1, Canada
| | - Erin M McConnell
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, L8S 4K1, Canada
| | - Enas Osman
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, L8S 4K1, Canada
| | - Alexander Scott
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, L8S 4K1, Canada
| | - Jimmy Gu
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, L8S 4K1, Canada
| | - Todd Hoare
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, L8S 4K1, Canada; Department of Chemical Engineering, McMaster University, Hamilton, Ontario, L8S 4K1, Canada
| | - Leyla Soleymani
- Department of Engineering Physics, McMaster University, Hamilton, Ontario, L8S 4K1, Canada; School of Biomedical Engineering, McMaster University, Hamilton, Ontario, L8S 4K1, Canada; Michael G. DeGroot Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, L8S 4K1, Canada.
| | - Yingfu Li
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, L8S 4K1, Canada; Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, L8S 4K1, Canada; Michael G. DeGroot Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, L8S 4K1, Canada.
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2
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Su Z, Wen Q, Li S, Guo L, Li M, Xiong Y, Li W, Ren J. A G-quadruplex/hemin structure-undamaged method to inhibit peroxidase-mimic DNAzyme activity for biosensing development. Anal Chim Acta 2022; 1221:340143. [DOI: 10.1016/j.aca.2022.340143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 06/28/2022] [Accepted: 07/02/2022] [Indexed: 11/29/2022]
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3
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Beyond G-Quadruplexes-The Effect of Junction with Additional Structural Motifs on Aptamers Properties. Int J Mol Sci 2021; 22:ijms22189948. [PMID: 34576112 PMCID: PMC8466185 DOI: 10.3390/ijms22189948] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 12/02/2022] Open
Abstract
G-quadruplexes constitute an important type of nucleic acid structure, which can be found in living cells and applied by cell machinery as pivotal regulatory elements. Importantly, robust development of SELEX technology and modern, nucleic acid-based therapeutic strategies targeted towards various molecules have also revealed a large group of potent aptamers whose structures are grounded in G-quadruplexes. In this review, we analyze further extension of tetraplexes by additional structural elements and investigate whether G-quadruplex junctions with duplex, hairpin, triplex, or second G-quadruplex motifs are favorable for aptamers stability and biological activity. Furthermore, we indicate the specific and pivotal role of the G-quadruplex domain and the additional structural elements in interactions with target molecules. Finally, we consider the potency of G-quadruplex junctions in future applications and indicate the emerging research area that is still waiting for development to obtain highly specific and effective nucleic acid-based molecular tools.
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4
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Li HK, Ye HL, Zhao XX, Sun XL, Zhu QQ, Han ZY, Yuan R, He H. Artful union of a zirconium-porphyrin MOF/GO composite for fabricating an aptamer-based electrochemical sensor with superb detecting performance. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.02.042] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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5
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Design, Synthesis and Characterization of Cyclic NU172 Analogues: A Biophysical and Biological Insight. Int J Mol Sci 2020; 21:ijms21113860. [PMID: 32485818 PMCID: PMC7312020 DOI: 10.3390/ijms21113860] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/20/2020] [Accepted: 05/28/2020] [Indexed: 11/16/2022] Open
Abstract
NU172—a 26-mer oligonucleotide able to bind exosite I of human thrombin and inhibit its activity—was the first aptamer to reach Phase II clinical studies as an anticoagulant in heart disease treatments. With the aim of favoring its functional duplex-quadruplex conformation and thus improving its enzymatic stability, as well as its thrombin inhibitory activity, herein a focused set of cyclic NU172 analogues—obtained by connecting its 5′- and 3′-extremities with flexible linkers—was synthesized. Two different chemical approaches were exploited in the cyclization procedure, one based on the oxime ligation method and the other on Cu(I)-assisted azide-alkyne cycloaddition (CuAAC), affording NU172 analogues including circularizing linkers with different length and chemical nature. The resulting cyclic NU172 derivatives were characterized using several biophysical techniques (ultraviolet (UV) and circular dichroism (CD) spectroscopies, gel electrophoresis) and then investigated for their serum resistance and anticoagulant activity in vitro. All the cyclic NU172 analogues showed higher thermal stability and nuclease resistance compared to unmodified NU172. These favorable properties were, however, associated with reduced—even though still significant—anticoagulant activity, suggesting that the conformational constraints introduced upon cyclization were somehow detrimental for protein recognition. These results provide useful information for the design of improved analogues of NU172 and related duplex-quadruplex structures.
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Liu Y, Kumar S, Taylor RE. Mix-and-match nanobiosensor design: Logical and spatial programming of biosensors using self-assembled DNA nanostructures. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2018; 10:e1518. [PMID: 29633568 DOI: 10.1002/wnan.1518] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 01/23/2018] [Accepted: 02/14/2018] [Indexed: 01/04/2023]
Abstract
The evergrowing need to understand and engineer biological and biochemical mechanisms has led to the emergence of the field of nanobiosensing. Structural DNA nanotechnology, encompassing methods such as DNA origami and single-stranded tiles, involves the base pairing-driven knitting of DNA into discrete one-, two-, and three-dimensional shapes at nanoscale. Such nanostructures enable a versatile design and fabrication of nanobiosensors. These systems benefit from DNA's programmability, inherent biocompatibility, and the ability to incorporate and organize functional materials such as proteins and metallic nanoparticles. In this review, we present a mix-and-match taxonomy and approach to designing nanobiosensors in which the choices of bioanalyte and transduction mechanism are fully independent of each other. We also highlight opportunities for greater complexity and programmability of these systems that are built using structural DNA nanotechnology. This article is categorized under: Implantable Materials and Surgical Technologies > Nanomaterials and Implants Diagnostic Tools > Biosensing Biology-Inspired Nanomaterials > Nucleic Acid-Based Structures Nanotechnology Approaches to Biology > Nanoscale Systems in Biology.
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Affiliation(s)
- Ying Liu
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania
| | - Sriram Kumar
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania
| | - Rebecca E Taylor
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania.,Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania
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7
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Chemiluminescence assay for detection of 2-hydroxyfluorene using the G-quadruplex DNAzyme-H 2O 2-luminol system. Mikrochim Acta 2017; 185:54. [PMID: 29594378 DOI: 10.1007/s00604-017-2555-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 11/09/2017] [Indexed: 12/13/2022]
Abstract
A chemiluminescence (CL) based assay is described for the determination of the environmental pollutant 2-hydroxyfluorene (2-HOFlu) which is found to inhibit the CL of a system composed of the G-quadruplex/hemin complex (a DNAzyme), H2O2, and luminol. The G-rich aptamer PW17 is transformed to a potassium(I)-stabilized G-quadruplex-hemin complex which displays peroxidase-like activity to catalyze the oxidation of luminol by H2O2 which is accompanied by strong blue CL emission. On addition of 2-HOFlu, it will participate in the G-quadruplex DNAzyme-mediated oxidation by H2O2. As a result, CL intensity is decreased. The difference in CL intensity (ΔI) before and after addition of 2-HOFlu serves as the signal for its quantitation. In water of pH 9.0, a linear relationship is found for the 1 nM to 1 μM concentration range, with a 0.2 nM detection limit. The assay is highly selective over other fluorene derivatives. It was successfully applied to the determination of 2-HOFlu in spiked lake water samples. The method is rapid, cost-effective and convenient. Conceivably, it has a wide scope in that it may be applied to other target pollutants for which G-quadruplexes are available. Graphical abstract A chemiluminescence (CL) assay is described for the determination of the environmental pollutant 2-hydroxyfluorene (2-HOFlu) based on the inhibition of the CL system composed of the G-quadruplex/hemin complex (a DNAzyme), H2O2, and luminol.
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Russo Krauss I, Napolitano V, Petraccone L, Troisi R, Spiridonova V, Mattia CA, Sica F. Duplex/quadruplex oligonucleotides: Role of the duplex domain in the stabilization of a new generation of highly effective anti-thrombin aptamers. Int J Biol Macromol 2017; 107:1697-1705. [PMID: 29024684 DOI: 10.1016/j.ijbiomac.2017.10.033] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Revised: 10/05/2017] [Accepted: 10/06/2017] [Indexed: 12/19/2022]
Abstract
Recently, mixed duplex/quadruplex oligonucleotides have attracted great interest for use as biomedical aptamers. In the case of anti-thrombin aptamers, the addition of duplex-forming sequences to a G-quadruplex module identical or very similar to the best-known G-quadruplex of the Thrombin Binding Aptamer (HD1) results in new or improved biological properties, such as higher activity or different recognition properties with respect to HD1. Remarkably, this bimodular fold was hypothesized, based on its sequence, for the only anti-thrombin aptamer in advanced clinical trial, NU172. Whereas cation modulation of G-quadruplex conformation and stability is well characterized, only few data from similar analysis on duplex/quadruplex oligonucleotides exist. Here we have performed a characterization of structure and stability of four different duplex/quadruplex anti-thrombin aptamers, including NU172, in the presence of different cations and in physiological-mimicking conditions in comparison to HD1, by means of spectroscopic techniques (UV and circular dichroism) and differential scanning calorimetry. Our data show a strong reciprocal influence of each domain on the stability of the other and in particular suggest a stabilizing effect of the duplex region in the presence of solutions mimicking the physiological conditions, strengthening the idea that bimodular aptamers present better therapeutic potentialities than those containing a single G-quadruplex domain.
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Affiliation(s)
- Irene Russo Krauss
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80126, Naples, Italy; CSGI - Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, Via della Lastruccia 3, I-50019, Sesto Fiorentino, FI, Italy
| | - Valeria Napolitano
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80126, Naples, Italy
| | - Luigi Petraccone
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80126, Naples, Italy
| | - Romualdo Troisi
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80126, Naples, Italy
| | - Vera Spiridonova
- A.N. Belozersky Institute of Physico-Chemical Biology, M.V. Lomonosov Moscow State University, 119992 Moscow, Russia
| | - Carlo Andrea Mattia
- Department of Pharmacy, University of Salerno, Via Ponte Don Melillo, I-84084, Fisciano, SA, Italy
| | - Filomena Sica
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80126, Naples, Italy.
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9
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Zhao T, Liu R, Ding X, Zhao J, Yu H, Wang L, Xu Q, Wang X, Lou X, He M, Xiao Y. Nanoprobe-Enhanced, Split Aptamer-Based Electrochemical Sandwich Assay for Ultrasensitive Detection of Small Molecules. Anal Chem 2015; 87:7712-9. [PMID: 26171721 DOI: 10.1021/acs.analchem.5b01178] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
It is quite challenging to improve the binding affinity of antismall molecule aptamers. We report that the binding affinity of anticocaine split aptamer pairs improved by up to 66-fold by gold nanoparticles (AuNP)-attached aptamers due to the substantially increased local concentration of aptamers and multiple and simultaneous ligand interactions. The significantly improved binding affinity enables the detection of small molecule targets with unprecedented sensitivity, as demonstrated in nanoprobe-enhanced split aptamer-based electrochemical sandwich assays (NE-SAESA). NE-SAESA replaces the traditional molecular reporter probe with AuNPs conjugated to multiple reporter probes. The increased binding affinity allowed us to use 1,000-fold lower reporter probe concentrations relative to those employed in SAESA. We show that the near-elimination of background in NE-SAESA effectively improves assay sensitivity by ∼1,000-100,000-fold for ATP and cocaine detection, relative to equivalent SAESA. With the ongoing development of new strategies for the selection of aptamers, we anticipate that our sensor platform should offer a generalizable approach for the high-sensitivity detection of diverse targets. More importantly, we believe that NE-SAESA represents a novel strategy to improve the binding affinity between a small molecule and its aptamer and potentially can be extended to other detection platforms.
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Affiliation(s)
- Tao Zhao
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Ran Liu
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Xiaofan Ding
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Juncai Zhao
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Haixiang Yu
- ‡Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Lei Wang
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Qing Xu
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Xuan Wang
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Xinhui Lou
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Miao He
- §School of Environment, Tsinghua University, Beijing 100084, China
| | - Yi Xiao
- ‡Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
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10
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Gribas AV, Korolev SP, Zatsepin TS, Gottikh MB, Sakharov IY. Structure–activity relationship study for design of highly active covalent peroxidase-mimicking DNAzyme. RSC Adv 2015. [DOI: 10.1039/c5ra03167b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
We synthesized a series of conjugates of hemin and its aptamer EAD2, named covalent peroxidase-mimicking DNAzymes (PMDNAzymes), varying the length, rigidity and 5′-/3′-position of the linker between the oligonucleotide and hemin.
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Affiliation(s)
| | - Sergey P. Korolev
- Department of Chemistry
- Lomonosov Moscow State University
- Moscow 119991
- Russia
- Belozersky Institute of Physical and Chemical Biology
| | - Timofey S. Zatsepin
- Department of Chemistry
- Lomonosov Moscow State University
- Moscow 119991
- Russia
- Belozersky Institute of Physical and Chemical Biology
| | - Marina B. Gottikh
- Belozersky Institute of Physical and Chemical Biology
- Lomonosov Moscow State University
- Moscow 119991
- Russia
| | - Ivan Yu. Sakharov
- Department of Chemistry
- Lomonosov Moscow State University
- Moscow 119991
- Russia
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11
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Yang DK, Kuo CJ, Chen LC. Synthetic multivalent DNAzymes for enhanced hydrogen peroxide catalysis and sensitive colorimetric glucose detection. Anal Chim Acta 2014; 856:96-102. [PMID: 25542363 DOI: 10.1016/j.aca.2014.11.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 11/21/2014] [Accepted: 11/24/2014] [Indexed: 12/21/2022]
Abstract
A peroxidase-mimic DNAzyme is a G-quadruplex (G4) DNA-hemin complex, in which the G4-DNA resembles an apoenzyme, and hemin is the cofactor for hydrogen peroxide (H2O2) catalysis. Twenty-one-mer CatG4 is a well-proven G4-DNA as well as a hemin-binding aptamer for constituting a DNAzyme. This work studied if a multivalent DNAzyme with accelerated catalysis could be constructed using a multimeric CatG4 with hemin. We compared CatG4 monomer, dimer, trimer, and tetramer, which were prepared by custom oligo synthesis, for G4 structure formation. According to circular dichroism (CD) analysis, we found that a CatG4 multimer exhibited more active G4 conformation than the sum effect of equal-number CatG4 monomers. However, the DNAzyme kinetics was not improved monotonically along with the subunit number of a multimeric CatG4. It was the trivalent DNAzyme, trimeric CatG4:hemin, resulting in the rapidest H2O2 catalysis instead of a tetravalent one. We discovered that the trivalent DNAzyme's highest catalytic rate was correlated to its most stable hemin-binding G4 structure, evidenced by CD melting temperature analysis. Finally, a trivalent DNAzyme-based colorimetric glucose assay with a detection limit as low as 10 μM was demonstrated, and this assay did not need adenosine 5'-tri-phosphate disodium salt hydrate (ATP) as a DNAzyme boosting agent.
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Affiliation(s)
- Deng-Kai Yang
- Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Chia-Jung Kuo
- Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Lin-Chi Chen
- Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, Taipei 10617, Taiwan.
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12
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Sensor Design Based on Structure Adjustment in Loops of G-quadruplex. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2014. [DOI: 10.1016/s1872-2040(14)60772-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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WANG K, TAO ZH, XU L, LIU YQ. Research and Development of Functionalized Aptamer based Biosensor. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2014. [DOI: 10.1016/s1872-2040(13)60712-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Development of an antigen-DNAzyme based probe for a direct antibody-antigen assay using the intrinsic DNAzyme activity of a daunomycin aptamer. SENSORS 2013; 14:346-55. [PMID: 24379042 PMCID: PMC3926560 DOI: 10.3390/s140100346] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 12/09/2013] [Accepted: 12/13/2013] [Indexed: 01/04/2023]
Abstract
G-Quadruplex (G-4) structures are formed when G-rich DNA sequences fold into intra- or intermolecular four-stranded structures in the presence of metal ions. G-4-hemin complexes are often effective peroxidase-mimicking DNAzymes that are applied in many detection systems. This work reports the application of a G-rich daunomycin-specific aptamer for the development of an antibody-antigen detection assay. We investigated the ability of the daunomycin aptamer to efficiently catalyze the hemin-dependent peroxidase activity independent of daunomycin. A reporter probe consisting of biotinylated antigen and daunomycin aptamer coupled to streptavidin gold nanoparticles was successfully used to generate a colorimetric readout. In conclusion, the daunomycin aptamer can function as a robust alternative DNAzyme for the development of colorimetric assays.
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15
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Russo Krauss I, Pica A, Merlino A, Mazzarella L, Sica F. Duplex-quadruplex motifs in a peculiar structural organization cooperatively contribute to thrombin binding of a DNA aptamer. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2013; 69:2403-11. [PMID: 24311581 DOI: 10.1107/s0907444913022269] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 08/08/2013] [Indexed: 11/10/2022]
Abstract
Potent second-generation thrombin aptamers adopt a duplex-quadruplex bimodular folding and recognize thrombin exosite II with very high affinity and specificity. A sound model of these oligonucleotides, either free or in complex with thrombin, is not yet available. Here, a structural study of one of these aptamers, HD22-27mer, is presented. The crystal structure of this aptamer in complex with thrombin displays a novel architecture in which the helical stem is enchained to a pseudo-G-quadruplex. The results also underline the role of the residues that join the duplex and quadruplex motifs and control their recruitment in thrombin binding.
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Affiliation(s)
- Irene Russo Krauss
- Department of Chemical Sciences, University of Naples `Federico II', Complesso Universitario di Monte Sant'Angelo, I-80126 Naples, Italy
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16
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Aptamer functionalized gold nanoparticles based fluorescent probe for the detection of mercury (II) ion in aqueous solution. Talanta 2013; 113:26-30. [PMID: 23708619 DOI: 10.1016/j.talanta.2013.03.055] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2012] [Revised: 03/18/2013] [Accepted: 03/23/2013] [Indexed: 11/23/2022]
Abstract
A method is proposed for the detection of Hg(2+) using Hg(2+) specific DNA (MSD) functionalized gold nanoparticles (AuNPs) based on the formation of T-Hg(2+)-T complex and the excellent quenching fluorescence property of AuNPs. The MSD is rich in thymine (T) and readily forms T-Hg(2+)-T configuration in the presence of Hg(2+). The MSD which is labeled with a fluorescein (FAM) at the 3'-end and a thiol at the 5'-end is bounded to the AuNPs through Au-S covalent bonds to form the probes (AuNPs-MSD). Hg(2+) detection can be easily realized by monitoring the change of fluorescence signal of AuNPs-MSD probes. Hg(2+) can be detected in a range of 0.02-1.0 µM with a detection limit of 16 nM. Besides, the assay shows excellent selectivity for Hg(2+) over other metal cations such as Fe(3+), Ca(2+), Mg(2+), Mn(2+), Cr(3+), Ni(2+), Cu(2+), Co(2+) and Pb(2+). The major advantages of this Hg(2+) assay are its water-solubility, simplicity, low cost and high sensitivity. Moreover, this method provides a potentially useful method for the Hg(2+) detection in aqueous solution.
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17
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Köster DM, Haselbach D, Lehrach H, Seitz H. A DNAzyme based label-free detection system for miniaturized assays. MOLECULAR BIOSYSTEMS 2011; 7:2882-9. [PMID: 21792453 DOI: 10.1039/c1mb05132f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Sensitive detection assays are a prerequisite for the analysis of small amounts of samples derived from biological material. There is a great demand for highly sensitive and robust detection techniques to analyze biomolecules. The combination of catalytic active DNA (DNAzyme) with a peroxidase activity with rolling circle amplification (RCA) is a promising alternative to common detection systems. The rolling circle amplification leads to a product with tandemly linked copies of DNAzymes. The continuous signal generation of the amplified DNAzymes results in an increased sensitivity. The combination of two amplification reactions, namely RCA and DNAzymes, results in increased signal intensity by a factor of 10(6). With this approach the labeling of samples can be avoided. The advantage of the introduced assay is the usage of nucleic acids as biosensors for the detection of biomolecules. Coupling of the analyte molecule to the detection molecules allows the direct detection of the analyte molecule. The described label-free hotpot assay has a broad potential field of applications. The hotpot assay can be adapted to detect and analyze RNA, DNA and proteins down to femtomolar concentrations in a miniaturized platform with a total reaction solution of 50 nl. The applicability of the assay for diagnostics and research will be shown with a focus on high throughput systems using a nano-well platform.
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Affiliation(s)
- Daniela M Köster
- Max Planck Institute for Molecular Genetics, Vertebrate Genomics, Ihnestraße 63-73, 14195 Berlin, Germany
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18
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Kong DM, Xu J, Shen HX. Positive effects of ATP on G-quadruplex-hemin DNAzyme-mediated reactions. Anal Chem 2010; 82:6148-53. [PMID: 20552961 DOI: 10.1021/ac100940v] [Citation(s) in RCA: 133] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Some G-quadruplex-hemin complexes can be used as peroxidase-mimicking DNAzymes, catalyzing H(2)O(2)-mediated reactions such as the oxidation of 2,2'-azinobis (3-ethylbenzothiozoline)-6-sulfonic acid (ABTS) by H(2)O(2). However, some challenges, for example, the relatively low catalytic activity and the disproportionation of the reaction product ABTS*(+), may seriously restrict further development and applications of these complexes. Here, we demonstrated the positive effect of adenosine triphosphate (ATP) on G-quadruplex-hemin DNAzyme-mediated catalytic reactions. The presence of ATP not only improved the catalytic activity of G-quadruplex-hemin DNAzymes, but also inhibited the disproportionation of ABTS*(+). These observations may improve the performance of existing G-quadruplex-hemin DNAzyme-based chemical sensors, for example, the Ag(+)-detection method that uses G-quadruplex-hemin DNAzymes, and widen the application range of G-quadruplex-hemin DNAzymes. We also demonstrated that the phosphate groups, nucleobase, and sugar of ATP determine the reaction-promoting ability of ATP. These observations may be helpful in the design of highly efficient enhancers for G-quadruplex-hemin DNAzymes.
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Affiliation(s)
- De-Ming Kong
- Key Laboratory of Functional Polymer Materials (Nankai University), Ministry of Education, Nankai University, Tianjin 300071, P. R. China.
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Lee JB, Campolongo MJ, Kahn JS, Roh YH, Hartman MR, Luo D. DNA-based nanostructures for molecular sensing. NANOSCALE 2010; 2:188-197. [PMID: 20644794 DOI: 10.1039/b9nr00142e] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Nanotechnology has opened up new avenues towards ultra-sensitive, highly selective detection of biological molecules and toxic agents, as well as for therapeutic targeting and screening. Though the goals may seem singular, there is no universal method to identify or detect a molecular target. Each system is application-specific and must not only identify the target, but also transduce this interaction into a meaningful signal rapidly, reliably, and inexpensively. This review focuses on the current capabilities and future directions of DNA-based nanostructures in sensing and detection.
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Affiliation(s)
- Jong Bum Lee
- Department of Biological & Environmental Engineering, Cornell University, 226 Riley Robb, Ithaca, New York 14853, USA
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Li T, Li B, Wang E, Dong S. G-quadruplex-based DNAzyme for sensitive mercury detection with the naked eye. Chem Commun (Camb) 2009:3551-3. [DOI: 10.1039/b903993g] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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