1
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Raffaini G. Adsorption and Self-Aggregation of Chiral [5]-Aza[6]helicenes on DNA Architecture: A Molecular Dynamics Study. J Phys Chem B 2023; 127:8285-8295. [PMID: 37751596 PMCID: PMC10561140 DOI: 10.1021/acs.jpcb.3c02487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 09/02/2023] [Indexed: 09/28/2023]
Abstract
Helicenes are an extremely interesting class of conjugated molecules without asymmetric carbon atoms but with intrinsic chirality. These molecules can interact with double-stranded chiral B-DNA architecture, modifying after their adsorption the hydrophilicity exposed by DNA to the biological environment. They also form ordered structures due to self-aggregation processes with possible different light emissions. Following initial studies based on molecular mechanics (MM) and molecular dynamics (MD) simulations regarding the adsorption and self-aggregation process of 5-aza[5]helicenes on double-stranded B-DNA, this theoretical work investigates the interaction between (M)- and (P)-5-aza[6]helicenes with double-helix DNA. Initially, the interaction of the pure single enantiomer with DNA is studied. Possible preferential absorption in minor or major grooves can occur. Afterward, the interaction of enantiopure compounds (M)- and (P)-5-aza[6]helicenes, potentially occurring in a racemic mixture at different concentrations, was investigated, taking into consideration both competitive adsorption on DNA and the possible helicenes' self-aggregation process. The structural selectivity of DNA binding and the role of helicene concentration in adsorption and the self-aggregation process are interesting. In addition, the ability to form ordered structures on DNA that follow its chiral architecture, thanks to favorable van der Waals intermolecular interactions, is curious.
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Affiliation(s)
- Giuseppina Raffaini
- Department
of Chemistry, Materials, and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza L. Da Vinci 32, 20131 Milano, Italy
- INSTM,
National Consortium of Materials Science and Technology, Local Unit Politecnico di Milano, 20131 Milano, Italy
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2
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Fadeev M, Davidson-Rozenfeld G, Li Z, Willner I. Stimuli-Responsive DNA-Based Hydrogels on Surfaces for Switchable Bioelectrocatalysis and Controlled Release of Loads. ACS APPLIED MATERIALS & INTERFACES 2023; 15:37011-37025. [PMID: 37477942 PMCID: PMC10401574 DOI: 10.1021/acsami.3c06230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 07/04/2023] [Indexed: 07/22/2023]
Abstract
The assembly of enzyme [glucose oxidase (GOx)]-loaded stimuli-responsive DNA-based hydrogels on electrode surfaces, and the triggered control over the stiffness of the hydrogels, provides a means to switch the bioelectrocatalytic functions of the hydrogels. One system includes the assembly of GOx-loaded, pH-responsive, hydrogel matrices cross-linked by two cooperative nucleic acid motives comprising permanent duplex nucleic acids and "caged" i-motif pH-responsive duplexes. Bioelectrocatalyzed oxidation of glucose leads to the formation of gluconic acid that acidifies the hydrogel resulting in the separation of the i-motif constituents and lowering the hydrogel stiffness. Loading of the hydrogel matrices with insulin results in the potential-triggered, glucose concentration-controlled, switchable release of insulin from the hydrogel-modified electrodes. The switchable bioelectrocatalyzed release of insulin is demonstrated in the presence of ferrocenemethanol as a diffusional electron mediator or by applying an electrically wired integrated matrix that includes ferrocenyl-modified GOx embedded in the hydrogel. The second GOx-loaded, stimuli-responsive, DNA-based hydrogel matrix associated with the electrode includes a polyacrylamide hydrogel cooperatively cross-linked by duplex nucleic acids and "caged" G-quadruplex-responsive duplexes. The hydrogel matrix undergoes K+-ions/crown ether-triggered stiffness changes by the cyclic K+-ion-stimulated formation of G-quadruplexes (lower stiffness) and the crown ether-induced separation of the G-quadruplexes (higher stiffness). The hydrogel matrices demonstrate switchable bioelectrocatalytic functions guided by the stiffness properties of the hydrogels.
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Affiliation(s)
- Michael Fadeev
- The Institute of Chemistry, The Center
for Nanoscience and Nanotechnology, The
Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Gilad Davidson-Rozenfeld
- The Institute of Chemistry, The Center
for Nanoscience and Nanotechnology, The
Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Zhenzhen Li
- The Institute of Chemistry, The Center
for Nanoscience and Nanotechnology, The
Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Itamar Willner
- The Institute of Chemistry, The Center
for Nanoscience and Nanotechnology, The
Hebrew University of Jerusalem, Jerusalem 91904, Israel
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3
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Rajan B, Bedekar AV. Effect of methyl substituent in the fjord region on the conformational stability of aza[5]helicenes. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130178] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Dhbaibi K, Favereau L, Crassous J. Enantioenriched Helicenes and Helicenoids Containing Main-Group Elements (B, Si, N, P). Chem Rev 2019; 119:8846-8953. [DOI: 10.1021/acs.chemrev.9b00033] [Citation(s) in RCA: 242] [Impact Index Per Article: 48.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kais Dhbaibi
- ISCR (Institut des Sciences Chimiques de Rennes), UMR6226, CNRS, Université Rennes, F-35000 Rennes, France
- Faculty of Science of Gabès, University of Gabés, Zrig, 6072 Gabès Tunisia
| | - Ludovic Favereau
- ISCR (Institut des Sciences Chimiques de Rennes), UMR6226, CNRS, Université Rennes, F-35000 Rennes, France
| | - Jeanne Crassous
- ISCR (Institut des Sciences Chimiques de Rennes), UMR6226, CNRS, Université Rennes, F-35000 Rennes, France
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5
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Holme M, Rana S, Barriga HMG, Kauscher U, Brooks NJ, Stevens MM. A Robust Liposomal Platform for Direct Colorimetric Detection of Sphingomyelinase Enzyme and Inhibitors. ACS NANO 2018; 12:8197-8207. [PMID: 30080036 PMCID: PMC6117748 DOI: 10.1021/acsnano.8b03308] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 07/20/2018] [Indexed: 05/23/2023]
Abstract
The enzyme sphingomyelinase (SMase) is an important biomarker for several diseases such as Niemann Pick's, atherosclerosis, multiple sclerosis, and HIV. We present a two-component colorimetric SMase activity assay that is more sensitive and much faster than currently available commercial assays. Herein, SMase-triggered release of cysteine from a sphingomyelin (SM)-based liposome formulation with 60 mol % cholesterol causes gold nanoparticle (AuNP) aggregation, enabling colorimetric detection of SMase activities as low as 0.02 mU/mL, corresponding to 1.4 pM concentration. While the lipid composition offers a stable, nonleaky liposome platform with minimal background signal, high specificity toward SMase avoids cross-reactivity of other similar phospholipases. Notably, use of an SM-based liposome formulation accurately mimics the natural in vivo substrate: the cell membrane. We studied the physical rearrangement process of the lipid membrane during SMase-mediated hydrolysis of SM to ceramide using small- and wide-angle X-ray scattering. A change in lipid phase from a liquid to gel state bilayer with increasing concentration of ceramide accounts for the observed increase in membrane permeability and consequent release of encapsulated cysteine. We further demonstrated the effectiveness of the sensor in colorimetric screening of small-molecule drug candidates, paving the way for the identification of novel SMase inhibitors in minutes. Taken together, the simplicity, speed, sensitivity, and naked-eye readout of this assay offer huge potential in point-of-care diagnostics and high-throughput drug screening.
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Affiliation(s)
- Margaret
N. Holme
- Department
of Materials, Imperial College London, London, SW7 2AZ, U.K.
- Department of Bioengineering and Institute of Biomedical
Engineering, Imperial College London, London, SW7 2AZ, U.K.
- Department
of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Subinoy Rana
- Department
of Materials, Imperial College London, London, SW7 2AZ, U.K.
- Department of Bioengineering and Institute of Biomedical
Engineering, Imperial College London, London, SW7 2AZ, U.K.
- School
of Engineering, Newcastle University, Newcastle upon Tyne, NE1
7RU, U.K.
| | - Hanna M. G. Barriga
- Department
of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Ulrike Kauscher
- Department
of Materials, Imperial College London, London, SW7 2AZ, U.K.
- Department of Bioengineering and Institute of Biomedical
Engineering, Imperial College London, London, SW7 2AZ, U.K.
| | | | - Molly M. Stevens
- Department
of Materials, Imperial College London, London, SW7 2AZ, U.K.
- Department of Bioengineering and Institute of Biomedical
Engineering, Imperial College London, London, SW7 2AZ, U.K.
- Department
of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
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6
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Severa L, Sázelová P, Císařová I, Šaman D, Koval D, Devadig P, Kašička V, Teplý F. Dutch Resolution of a configurationally stable [5]helquat. Chirality 2018; 30:254-260. [DOI: 10.1002/chir.22789] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 10/25/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Lukáš Severa
- The Institute of Organic Chemistry and Biochemistry of the Czech; Academy of Sciences; Prague 6 Czech Republic
| | - Petra Sázelová
- The Institute of Organic Chemistry and Biochemistry of the Czech; Academy of Sciences; Prague 6 Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry; Charles University; Prague 2 Czech Republic
| | - David Šaman
- The Institute of Organic Chemistry and Biochemistry of the Czech; Academy of Sciences; Prague 6 Czech Republic
| | - Dušan Koval
- The Institute of Organic Chemistry and Biochemistry of the Czech; Academy of Sciences; Prague 6 Czech Republic
| | - Pradeep Devadig
- The Institute of Organic Chemistry and Biochemistry of the Czech; Academy of Sciences; Prague 6 Czech Republic
| | - Václav Kašička
- The Institute of Organic Chemistry and Biochemistry of the Czech; Academy of Sciences; Prague 6 Czech Republic
| | - Filip Teplý
- The Institute of Organic Chemistry and Biochemistry of the Czech; Academy of Sciences; Prague 6 Czech Republic
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7
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Ma W, Xu L, de Moura AF, Wu X, Kuang H, Xu C, Kotov NA. Chiral Inorganic Nanostructures. Chem Rev 2017; 117:8041-8093. [DOI: 10.1021/acs.chemrev.6b00755] [Citation(s) in RCA: 485] [Impact Index Per Article: 69.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - André F. de Moura
- Department
of Chemistry, Federal University of São Carlos, CP 676, CEP 13.565-905, São Carlos, SP, Brazil
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8
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Šebestík J, Teplý F, Císařová I, Vávra J, Koval D, Bouř P. Intense chirality induction in nitrile solvents by a helquat dye monitored by near resonance Raman scattering. Chem Commun (Camb) 2016; 52:6257-60. [PMID: 27087537 DOI: 10.1039/c6cc01606e] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chirality induction phenomena attract attention because of their relevance to intermolecular interactions encountered in living matter. Usually, such effects are weak. However, enantiomers of a [6]helquat dye were found to induce exceptionally strong chirality in several achiral solvents containing nitrile groups. This effect was observable as an intense Raman optical activity (ROA) induced in acetonitrile, acetonitrile-d3, and liquid hydrogen cyanide solvents. The observation was verified by measurement of both helquat enantiomers which provided mirror image ROA spectra. Theoretical analysis indicated that the 532 nm laser excitation light was in a near resonance with electronic transitions of the dye, which made the effect observable in very dilute solutions (1 : 200 000 helquat to nitrile ratio) and thus the phenomenon can be generally useful in analytical chemistry.
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Affiliation(s)
- Jaroslav Šebestík
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic.
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9
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Tel-Vered R, Kahn JS, Willner I. Layered Metal Nanoparticle Structures on Electrodes for Sensing, Switchable Controlled Uptake/Release, and Photo-electrochemical Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:51-75. [PMID: 26514112 DOI: 10.1002/smll.201501367] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 06/07/2015] [Indexed: 06/05/2023]
Abstract
Layered metal nanoparticle (NP) assemblies provide highly porous and conductive composites of unique electrical and optical (plasmonic) properties. Two methods to construct layered metal NP matrices are described, and these include the layer-by-layer deposition of NPs, or the electropolymerization of monolayer-functionalized NPs, specifically thioaniline-modified metal NPs. The layered NP composites are used as sensing matrices through the use of electrochemistry or surface plasmon resonance (SPR) as transduction signals. The crosslinking of the metal NP composites with molecular receptors, or the imprinting of molecular recognition sites into the electropolymerized NP matrices lead to selective and chiroselective sensing interfaces. Furthermore, the electrosynthesis of redox-active, imprinted, bis-aniline bridged Au NP composites yields electrochemically triggered "sponges" for the switchable uptake and release of electron-acceptor substrates, and results in conductive surfaces of electrochemically controlled wettability. Also, photosensitizer-relay-crosslinked Au NP composites, or electrochemically polymerized layered semiconductor quantum dot/metal NP matrices on electrodes, are demonstrated as functional nanostructures for photoelectrochemical applications.
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Affiliation(s)
- Ran Tel-Vered
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Jason S Kahn
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Itamar Willner
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
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10
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Abstract
Convergence of localized surface plasmon resonance of metal nanoparticles with classical ELISA has emerged as a new class of immunoassays, i.e. plasmonic ELISA, enabling biocatalysis mediated ultrasensitive naked-eye detection of disease biomarkers.
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Affiliation(s)
- Jitendra Satija
- School of BioSciences and Technology (SBST)
- VIT University
- Vellore
- India
| | - Nirmal Punjabi
- Department of Biosciences and Bioengineering
- IIT Bombay
- Mumbai 400 076
- India
| | - Debasish Mishra
- School of BioSciences and Technology (SBST)
- VIT University
- Vellore
- India
- Centre for Biomaterials, Cellular and Molecular Theranostics (CBCMT)
| | - Soumyo Mukherji
- Department of Biosciences and Bioengineering
- IIT Bombay
- Mumbai 400 076
- India
- Centre of Excellence for Nanoelectronics
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11
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Nath NK, Severa L, Kunetskiy RA, Císařová I, Fulem M, Růžička K, Koval D, Kašička V, Teplý F, Naumov P. Single-Crystal-to-Single-Crystal Transition in an Enantiopure [7]Helquat Salt: The First Observation of a Reversible Phase Transition in a Helicene-Like Compound. Chemistry 2015; 21:13508-12. [DOI: 10.1002/chem.201502094] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Indexed: 11/08/2022]
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12
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Upadhyay GM, Bedekar AV. Synthesis and photophysical properties of bi-aza[5]helicene and bi-aza[6]helicene. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.06.040] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Reyes-Gutiérrez PE, Jirásek M, Severa L, Novotná P, Koval D, Sázelová P, Vávra J, Meyer A, Císařová I, Šaman D, Pohl R, Štěpánek P, Slavíček P, Coe BJ, Hájek M, Kašička V, Urbanová M, Teplý F. Functional helquats: helical cationic dyes with marked, switchable chiroptical properties in the visible region. Chem Commun (Camb) 2015; 51:1583-6. [PMID: 25555172 DOI: 10.1039/c4cc08967g] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Helquat dyes are the first helicene-like cationic styryl dyes obtained as separate enantiomers. Their remarkable chiroptical properties are due to the unique combination of a cationic hemicyanine chromophore and a helicene-like motif. The magnitude of the ECD response and the pH switching along with their positioning in the visible region are unprecedented among helicenoids.
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Affiliation(s)
- Paul E Reyes-Gutiérrez
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic.
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14
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Upadhyay GM, Talele HR, Sahoo S, Bedekar AV. Synthesis of carbazole derived aza[7]helicenes. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.07.116] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Čížková M, Šaman D, Koval D, Kašička V, Klepetářová B, Císařová I, Teplý F. Modular Synthesis of Helicene-Like Compounds Based on the Imidazolium Motif. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402746] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Niazov-Elkan A, Golub E, Sharon E, Balogh D, Willner I. DNA sensors and aptasensors based on the hemin/G-quadruplex-controlled aggregation of Au NPs in the presence of L-cysteine. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:2883-2891. [PMID: 24700798 DOI: 10.1002/smll.201400002] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2014] [Revised: 02/20/2014] [Indexed: 06/03/2023]
Abstract
L-cysteine induces the aggregation of Au nanoparticles (NPs), resulting in a color transition from red to blue due to interparticle plasmonic coupling in the aggregated structure. The hemin/G-quadruplex horseradish peroxidase-mimicking DNAzyme catalyzes the aerobic oxidation of L-cysteine to cystine, a process that inhibits the aggregation of the NPs. The degree of inhibition of the aggregation process is controlled by the concentration of the DNAzyme in the system. These functions are implemented to develop sensing platforms for the detection of a target DNA, for the analysis of aptamer-substrate complexes, and for the analysis of L-cysteine in human urine samples. A hairpin DNA structure that includes a recognition site for the DNA analyte and a caged G-quadruplex sequence, is opened in the presence of the target DNA. The resulting self-assembled hemin/G-quadruplex acts as catalyst that controls the aggregation of the Au NPs. Also, the thrombin-binding aptamer folds into a G-quadruplex nanostructure upon binding to thrombin. The association of hemin to the resulting G-quadruplex aptamer-thrombin complex leads to a catalytic label that controls the L-cysteine-mediated aggregation of the Au NPs. The hemin/G-qaudruplex-controlled aggregation of Au NPs process is further implemented for visual and spectroscopic detection of L-cysteine concentration in urine samples.
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Affiliation(s)
- Angelica Niazov-Elkan
- The Institute of Chemistry, The Minerva Center for Biohybrid Complex Systems, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
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17
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Pospíšil L, Bednárová L, Štěpánek P, Slavíček P, Vávra J, Hromadová M, Dlouhá H, Tarábek J, Teplý F. Intense Chiroptical Switching in a Dicationic Helicene-Like Derivative: Exploration of a Viologen-Type Redox Manifold of a Non-Racemic Helquat. J Am Chem Soc 2014; 136:10826-9. [DOI: 10.1021/ja500220j] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Lubomír Pospíšil
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
- J.
Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 18223 Prague, Czech Republic
| | - Lucie Bednárová
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
| | - Petr Štěpánek
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
- Institute
of Physics, Faculty of Mathematics and Physics, Charles University, 12116 Prague, Czech Republic
| | - Petr Slavíček
- Department
of Physical Chemistry, Institute of Chemical Technology, 16628 Prague, Czech Republic
| | - Jan Vávra
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
| | - Magdaléna Hromadová
- J.
Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 18223 Prague, Czech Republic
| | - Helena Dlouhá
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
| | - Ján Tarábek
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
| | - Filip Teplý
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
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18
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Sharon E, Golub E, Niazov-Elkan A, Balogh D, Willner I. Analysis of Telomerase by the Telomeric Hemin/G-Quadruplex-Controlled Aggregation of Au Nanoparticles in the Presence of Cysteine. Anal Chem 2014; 86:3153-8. [DOI: 10.1021/ac5000152] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Etery Sharon
- Institute
of Chemistry, The
Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Eyal Golub
- Institute
of Chemistry, The
Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Angelica Niazov-Elkan
- Institute
of Chemistry, The
Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Dora Balogh
- Institute
of Chemistry, The
Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Itamar Willner
- Institute
of Chemistry, The
Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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19
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Wang F, Liu X, Lu CH, Willner I. Cysteine-mediated aggregation of Au nanoparticles: the development of a H2O2 sensor and oxidase-based biosensors. ACS NANO 2013; 7:7278-7286. [PMID: 23829431 DOI: 10.1021/nn402810x] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The cysteine-stimulated aggregation of Au nanoparticles (Au NPs) is used as an auxiliary reporting system for the optical detection of H2O2, for optical probing of the glucose oxidase (GOx) and the catalyzed oxidation of glucose, for probing the biocatalytic cascade composed of acetylcholine esterase/choline oxidase (AChE/ChOx), and for following the inhibition of AChE. The analytical paradigm is based on the I(-)-catalyzed oxidation of cysteine by H2O2 to cystine, a process that prohibits the cysteine-triggered aggregation of the Au NPs. The system enabled the analysis of H2O2 with a detection limit of 2 μM. As the GOx-biocatalyzed oxidation of glucose yields H2O2, and the AChE/ChOx cascade leads to the formation of H2O2, the two biocatalytic processes could be probed by the cysteine-stimulated aggregation of the Au NPs. Since AChE is inhibited by 1,5-bis(4-allyldimethylammonium phenyl)pentane-3-one dibromide, the biocatalytic AChE/ChOx cascade is inhibited by the inhibitor, thus leading to the enhanced cysteine-mediated aggregation of the NPs. The results suggest the potential implementation of the cysteine-mediated aggregation of Au NPs in the presence of AChE/ChOx as a sensing platform for the optical detection of chemical warfare agents.
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Affiliation(s)
- Fuan Wang
- Institute of Chemistry, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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20
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Guo L, Xu Y, Ferhan AR, Chen G, Kim DH. Oriented Gold Nanoparticle Aggregation for Colorimetric Sensors with Surprisingly High Analytical Figures of Merit. J Am Chem Soc 2013; 135:12338-45. [DOI: 10.1021/ja405371g] [Citation(s) in RCA: 272] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Longhua Guo
- Ministry of Education Key Laboratory
of Analysis and Detection Technology for Food Safety, Department of
Chemistry, Fuzhou University, Fuzhou, 350108,
China
| | - Yang Xu
- Ministry of Education Key Laboratory
of Analysis and Detection Technology for Food Safety, Department of
Chemistry, Fuzhou University, Fuzhou, 350108,
China
| | - Abdul Rahim Ferhan
- School of Chemical
and Biomedical
Engineering, Nanyang Technological University, 637457, Singapore
| | - Guonan Chen
- Ministry of Education Key Laboratory
of Analysis and Detection Technology for Food Safety, Department of
Chemistry, Fuzhou University, Fuzhou, 350108,
China
| | - Dong-Hwan Kim
- School of Chemical
and Biomedical
Engineering, Nanyang Technological University, 637457, Singapore
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21
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Wei W, Wu L, Xu C, Ren J, Qu X. A general approach using spiroborate reversible cross-linked Au nanoparticles for visual high-throughput screening of chiral vicinal diols. Chem Sci 2013. [DOI: 10.1039/c2sc21571c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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