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Masquelier E, Taxon E, Liang SP, Al Sabeh Y, Sepunaru L, Gordon MJ, Morse DE. A new electrochemical method that mimics phosphorylation of the core tau peptide K18 enables kinetic and structural analysis of intermediates and assembly. J Biol Chem 2023; 299:103011. [PMID: 36781124 PMCID: PMC10024187 DOI: 10.1016/j.jbc.2023.103011] [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: 08/30/2022] [Revised: 02/04/2023] [Accepted: 02/08/2023] [Indexed: 02/13/2023] Open
Abstract
Tau protein's reversible assembly and binding of microtubules in brain neurons are regulated by charge-neutralizing phosphorylation, while its hyperphosphorylation drives the irreversible formation of cytotoxic filaments associated with neurodegenerative diseases. However, the structural changes that facilitate these diverse functions are unclear. Here, we analyzed K18, a core peptide of tau, using newly developed spectroelectrochemical instrumentation that enables electroreduction as a surrogate for charge neutralization by phosphorylation, with simultaneous, real-time quantitative analyses of the resulting conformational transitions and assembly. We observed a tipping point between behaviors that paralleled the transition between tau's physiologically required, reversible folding and assembly and the irreversibility of assemblies. The resulting rapidly electroassembled structures represent the first fibrillar tangles of K18 that have been formed in vitro at room temperature without using heparin or other charge-complementary anionic partners. These methods make it possible to (i) trigger and analyze in real time the early stages of conformational transitions and assembly without the need for preformed seeds, heterogenous coacervation, or crowding; (ii) kinetically resolve and potentially isolate never-before-seen early intermediates in these processes; and (iii) develop assays for additional factors and mechanisms that can direct the trajectory of assembly from physiologically benign and reversible to potentially pathological and irreversible structures. We anticipate wide applicability of these methods to other amyloidogenic systems and beyond.
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Affiliation(s)
- Eloise Masquelier
- Institute for Collaborative Biotechnologies, University of California, Santa Barbara, California, USA; Materials Department, University of California, Santa Barbara, California, USA
| | - Esther Taxon
- Institute for Collaborative Biotechnologies, University of California, Santa Barbara, California, USA; Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, California, USA
| | - Sheng-Ping Liang
- Institute for Collaborative Biotechnologies, University of California, Santa Barbara, California, USA; Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, USA
| | - Yahya Al Sabeh
- Institute for Collaborative Biotechnologies, University of California, Santa Barbara, California, USA; Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, California, USA
| | - Lior Sepunaru
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, USA
| | - Michael J Gordon
- Institute for Collaborative Biotechnologies, University of California, Santa Barbara, California, USA; Department of Chemical Engineering, University of California, Santa Barbara, California, USA
| | - Daniel E Morse
- Institute for Collaborative Biotechnologies, University of California, Santa Barbara, California, USA; Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, California, USA.
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2
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Review on the interactions between dopamine metabolites and α-Synuclein in causing Parkinson's disease. Neurochem Int 2023; 162:105461. [PMID: 36460239 DOI: 10.1016/j.neuint.2022.105461] [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: 08/12/2022] [Revised: 11/26/2022] [Accepted: 11/28/2022] [Indexed: 12/05/2022]
Abstract
Parkinson's disease (PD) is characterized by an abnormal post-translational modifications (PTM) in amino acid sequence and aggregation of alpha-synuclein (α-Syn) protein. It is generally believed that dopamine (DA) metabolite in dopaminergic (DAergic) neurons promotes the aggregation of toxic α-Syn oligomers and protofibrils, whereas DA inhibits the formation of toxic fibers and even degrades the toxic fibers. Therefore, the study on interaction between DA metabolites and α-Syn oligomers is one of the current hot topics in neuroscience, because this effect may have direct relevance to the selective DAergic neuron loss in PD. Several mechanisms have been reported for DA metabolites induced α-Syn oligomers viz. i) The reactive oxygen species (ROS) released during the auto-oxidation or enzymatic oxidation of DA changes the structure of α-Syn by the oxidation of amino acid residue leading to misfolding, ii) The oxidized DA metabolites directly interact with α-Syn through covalent or non-covalent bonding leading to the formation of oligomers, iii) DA interacts with lipid or autophagy related proteins to decreases the degradation efficiency of α-Syn aggregates. However, there is no clear-cut mechanism proposed for the interaction between DA and α-Syn. However, it is believed that the lysine (Lys) side chain of α-Syn sequence is the initial trigger site for the oligomer formation. Herein, we review different chemical mechanism involved during the interaction of Lys side chain of α-Syn with DA metabolites such as dopamine-o-quinone (DAQ), dopamine-chrome (DAC), dopamine-aldehyde (DOPAL) and neuromelanin. This review also provides the promotive effect of divalent Cu2+ ions on DA metabolites induced α-Syn oligomers and its inhibition effect by antioxidant glutathione (GSH).
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3
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Suprun EV, Radko SP, Kozin SA, Mitkevich VA, Makarov AA. Electrochemical Analysis in Studying β-Amyloid Aggregation. BIOCHEMISTRY (MOSCOW) 2023; 88:S88-S104. [PMID: 37069116 DOI: 10.1134/s0006297923140067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
β-amyloid (Aβ) is comprised of a group of peptides formed as a result of cleavage of the amyloid precursor protein by secretases. Aβ aggregation is considered as a central event in pathogenesis of Alzheimer's disease, the most common human neurodegenerative disorder. Molecular mechanisms of Aβ aggregation have intensively being investigated using synthetic Aβ peptides by methods based on monitoring of aggregates, including determination of their size and structure. In this review, an orthogonal approach to the study of Aβ aggregation is considered, which relies on electrochemical registration of the loss of peptide monomers. Electrochemical analysis of Aβ (by voltammetry and amperometric flow injection analysis) is based on registration of the oxidation signal of electroactive amino acid residues of the peptide on an electrode surface. The Aβ oxidation signal disappears, when the peptide is included in the aggregate. The advantages and disadvantages of electrochemical analysis for the study of spontaneous and metal-induced aggregation of Aβ, comparative analysis of various peptide isoforms, and study of the process of complexation of metal ions with the metal-binding domain of Aβ are discussed. It is concluded that the combined use of the electrochemical method and the methods based on detection of Aβ aggregates makes it possible to obtain more complete information about the mechanisms of peptide aggregation.
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Affiliation(s)
- Elena V Suprun
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia.
- Orekhovich Institute of Biomedical Chemistry, Moscow, 119121, Russia
| | - Sergey P Radko
- Orekhovich Institute of Biomedical Chemistry, Moscow, 119121, Russia
| | - Sergey A Kozin
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Vladimir A Mitkevich
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Alexander A Makarov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
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4
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Li S, Noroozifar M, Zhou J, Kerman K. Electrochemical flow injection analysis of the interaction between pyrroloquinoline quinone (PQQ) and α-synuclein peptides related to Parkinson's disease. Analyst 2021; 146:4545-4556. [PMID: 34251376 DOI: 10.1039/d1an00698c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
α-Synuclein (α-syn) is a hallmark protein of Parkinson's disease (PD). The aggregation process of α-syn has been heavily associated with the pathogenesis of PD. With the exponentially growing number of potential therapeutic compounds that can inhibit the aggregation of α-syn, there is now a significant demand for a high-throughput analysis system. Herein, a novel flow injection analysis system with an electrochemical biosensor as the detector was developed to study the interaction of a well-described antioxidant and amyloid inhibitor, pyrroloquinoline quinone (PQQ) with α-synuclein peptides. Screen-printed gold electrodes (SPEs) were modified using heptapeptides from α-syn wild-type (WT) and mutants such as lysine knock-out (ETEE) and E46K. Affinity binding events between these peptides and PQQ were analyzed by electrochemical impedance spectroscopy (EIS) and further confirmed by high-performance liquid chromatography (HPLC), liquid chromatography/mass spectrometry (LC/MS), and nuclear magnetic resonance (NMR) spectroscopy. HPLC and LC/MS results revealed that PQQ formed a stable complex with α-syn. NMR results confirmed that the α-syn-PQQ complex was formed via a Schiff base formation-like process. In addition, results showed that lysine residues influenced the binding event, in which the presence of an extra lysine stabilized the α-syn-PQQ complex, and the absence of a lysine significantly decreased the interaction of α-syn with PQQ. Therefore, we concluded that EIS is a promising technique for the evaluation of the interaction between PQQ-based amyloid inhibitors and α-syn. The electrochemical flow injection analysis assembly provided a rapid and low-cost drug discovery platform for the evaluation of small molecule-protein interactions.
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Affiliation(s)
- Shaopei Li
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada.
| | - Meissam Noroozifar
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada.
| | - Jiayun Zhou
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada.
| | - Kagan Kerman
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada.
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5
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Koklu A, Wustoni S, Musteata VE, Ohayon D, Moser M, McCulloch I, Nunes SP, Inal S. Microfluidic Integrated Organic Electrochemical Transistor with a Nanoporous Membrane for Amyloid-β Detection. ACS NANO 2021; 15:8130-8141. [PMID: 33784064 PMCID: PMC8158856 DOI: 10.1021/acsnano.0c09893] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 03/22/2021] [Indexed: 05/26/2023]
Abstract
Alzheimer's disease (AD) is a neurodegenerative disorder associated with a severe loss in thinking, learning, and memory functions of the brain. To date, no specific treatment has been proven to cure AD, with the early diagnosis being vital for mitigating symptoms. A common pathological change found in AD-affected brains is the accumulation of a protein named amyloid-β (Aβ) into plaques. In this work, we developed a micron-scale organic electrochemical transistor (OECT) integrated with a microfluidic platform for the label-free detection of Aβ aggregates in human serum. The OECT channel-electrolyte interface was covered with a nanoporous membrane functionalized with Congo red (CR) molecules showing a strong affinity for Aβ aggregates. Each aggregate binding to the CR-membrane modulated the vertical ion flow toward the channel, changing the transistor characteristics. Thus, the device performance was not limited by the solution ionic strength nor did it rely on Faradaic reactions or conformational changes of bioreceptors. The high transconductance of the OECT, the precise porosity of the membrane, and the compactness endowed by the microfluidic enabled the Aβ aggregate detection over eight orders of magnitude wide concentration range (femtomolar-nanomolar) in 1 μL of human serum samples. We expanded the operation modes of our transistors using different channel materials and found that the accumulation-mode OECTs displayed the lowest power consumption and highest sensitivities. Ultimately, these robust, low-power, sensitive, and miniaturized microfluidic sensors helped to develop point-of-care tools for the early diagnosis of AD.
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Affiliation(s)
- Anil Koklu
- Biological
and Environmental Science and Engineering (BESE), Organic Bioelectronics
Laboratory, King Abdullah University of
Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Shofarul Wustoni
- Biological
and Environmental Science and Engineering (BESE), Organic Bioelectronics
Laboratory, King Abdullah University of
Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | | | - David Ohayon
- Biological
and Environmental Science and Engineering (BESE), Organic Bioelectronics
Laboratory, King Abdullah University of
Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Maximilian Moser
- Department
of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Iain McCulloch
- Department
of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom
- Physical
Science and Engineering Division, KAUST Solar Center (KSC), KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Suzana P. Nunes
- Advanced
Membranes and Porous Materials Center, KAUST,
BESE, Thuwal 23955-6900, Saudi Arabia
| | - Sahika Inal
- Biological
and Environmental Science and Engineering (BESE), Organic Bioelectronics
Laboratory, King Abdullah University of
Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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6
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Li B, Zhang G, Tahirbegi IB, Morten MJ, Tan H. Monitoring amyloid-β 42 conformational change using a spray-printed graphene electrode. Electrochem commun 2021. [DOI: 10.1016/j.elecom.2021.106927] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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7
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An Electrochemical Immunosensor Based on a Self-Assembled Monolayer Modified Electrode for Label-Free Detection of α-Synuclein. SENSORS 2020; 20:s20030617. [PMID: 31979160 PMCID: PMC7038178 DOI: 10.3390/s20030617] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/18/2020] [Accepted: 01/19/2020] [Indexed: 12/12/2022]
Abstract
This research demonstrated the development of a simple, cost-effective, and label-free immunosensor for the detection of α-synuclein (α-Syn) based on a cystamine (CYS) self-assembled monolayer (SAM) decorated fluorine-doped tin oxide (FTO) electrode. CYS-SAM was formed onto the FTO electrode by the adsorption of CYS molecules through the head sulfur groups. The free amine (–NH2) groups at the tail of the CYS-SAM enabled the immobilization of anti-α-Syn-antibody, which concurrently allowed the formation of immunocomplex by covalent bonding with α-Syn-antigen. The variation of the concentrations of the attached α-Syn at the immunosensor probe induced the alternation of the current and the charge transfer resistance (Rct) for the redox response of [Fe(CN)6]3−/4−, which displayed a linear dynamic range from 10 to 1000 ng/mL with a low detection limit (S/N = 3) of ca. 3.62 and 1.13 ng/mL in differential pulse voltammetry (DPV) and electrochemical impedance spectra (EIS) measurements, respectively. The immunosensor displayed good reproducibility, anti-interference ability, and good recoveries of α-Syn detection in diluted human serum samples. The proposed immunosensor is a promising platform to detect α-Syn for the early diagnose of Parkinson’s disease, which can be extended for the determination of other biologically important biomarkers.
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8
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Zhang Y, Ren B, Zhang D, Liu Y, Zhang M, Zhao C, Zheng J. Design principles and fundamental understanding of biosensors for amyloid-β detection. J Mater Chem B 2020; 8:6179-6196. [DOI: 10.1039/d0tb00344a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Aβ as biomarker in Alzheimer’s disease (AD) drives the significant research efforts for developing different biosensors with different sensing strategies, materials, and mechanisms for Aβ detection.
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Affiliation(s)
- Yanxian Zhang
- Department of Chemical
- Biomolecular, and Corrosion Engineering
- The University of Akron
- Ohio
- USA
| | - Baiping Ren
- Department of Chemical
- Biomolecular, and Corrosion Engineering
- The University of Akron
- Ohio
- USA
| | - Dong Zhang
- Department of Chemical
- Biomolecular, and Corrosion Engineering
- The University of Akron
- Ohio
- USA
| | - Yonglan Liu
- Department of Chemical
- Biomolecular, and Corrosion Engineering
- The University of Akron
- Ohio
- USA
| | - Mingzhen Zhang
- Department of Chemical
- Biomolecular, and Corrosion Engineering
- The University of Akron
- Ohio
- USA
| | - Chao Zhao
- Department of Chemical and Biomolecular Engineering
- The University of Alabama
- USA
| | - Jie Zheng
- Department of Chemical
- Biomolecular, and Corrosion Engineering
- The University of Akron
- Ohio
- USA
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9
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Electrochemical biosensors for the detection and study of α-synuclein related to Parkinson's disease - A review. Anal Chim Acta 2019; 1089:32-39. [PMID: 31627816 DOI: 10.1016/j.aca.2019.09.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 09/01/2019] [Accepted: 09/04/2019] [Indexed: 12/11/2022]
Abstract
Parkinson's disease (PD) is a long-term degenerative disorder that affects predominately dopaminergic neurons in the substantia nigra, which mainly control movement. Alpha-synuclein (α-syn) is a major constituent of Lewy bodies that are reported to be the most important toxic species in the brain of PD patients. In this critical review, we highlight novel electrochemical biosensors that have been recently developed utilizing aptamers and antibodies in connection with various nanomaterials to study biomarkers related to PD such as α-syn. We also review several research articles that have utilized electrochemical biosensors to study the interaction of α-syn with biometals as well as small molecules such as clioquinol, (-)-epigallocatechin-3-gallate (EGCG) and baicalein. Due to the significant advances in nanomaterials in the past decade, electrochemical biosensors capable of detecting multiple biomarkers in clinically relevant samples in real-time have been achieved. This may facilitate the path towards commercialization of electrochemical biosensors for clinical applications and high-throughput screening of small molecules for structure-activity relationship (SAR) studies.
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10
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Yoo YK, Lee J, Kim H, Hwang KS, Yoon DS, Lee JH. Toward Exosome-Based Neuronal Diagnostic Devices. MICROMACHINES 2018; 9:mi9120634. [PMID: 30501125 PMCID: PMC6315917 DOI: 10.3390/mi9120634] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/16/2018] [Accepted: 11/22/2018] [Indexed: 12/13/2022]
Abstract
Targeting exosome for liquid biopsy has gained significant attention for its diagnostic and therapeutic potential. For detecting neuronal disease diagnosis such as Alzheimer's disease (AD), the main technique for identifying AD still relies on positron-emission tomography (PET) imaging to detect the presence of amyloid-β (Aβ). While the detection of Aβ in cerebrospinal fluid has also been suggested as a marker for AD, the lack of quantitative measurements has compromised existing assays. In cerebrospinal fluid, in addition to Aβ, T-Tau, and P-Tau, alpha-synuclein has been considered a biomarker of neurodegeneration. This review suggests that and explains how the exosome can be used as a neuronal diagnostic component. To this end, we summarize current progress in exosome preparation/isolation and quantification techniques and comment on the outlooks for neuronal exosome-based diagnostic techniques.
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Affiliation(s)
- Yong Kyoung Yoo
- Department of Electrical Engineering, Kwangwoon University, 447-1 Wolgye, Nowon, Seoul 01897, Korea.
| | - Junwoo Lee
- Department of Electrical Engineering, Kwangwoon University, 447-1 Wolgye, Nowon, Seoul 01897, Korea.
| | - Hyungsuk Kim
- Department of Electrical Engineering, Kwangwoon University, 447-1 Wolgye, Nowon, Seoul 01897, Korea.
| | - Kyo Seon Hwang
- Department of Clinical Pharmacology and Therapeutics, College of Medicine, Kyung Hee University, Seoul 02447, Korea.
| | - Dae Sung Yoon
- School of Biomedical Engineering, Korea University, Seoul 02841, Korea.
| | - Jeong Hoon Lee
- Department of Electrical Engineering, Kwangwoon University, 447-1 Wolgye, Nowon, Seoul 01897, Korea.
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11
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Paleček E, Heyrovský M, Dorčák V. J. Heyrovský's Oscillographic Polarography. Roots of Present Chronopotentiometric Analysis of Biomacromolecules. ELECTROANAL 2018. [DOI: 10.1002/elan.201800109] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Emil Paleček
- Institute of Biophysics of the CAS; Královopolská 135 612 65 Brno Czech Republic
| | - Michael Heyrovský
- J. Heyrovský Institute of Physical Chemistry of the CAS; Dolejškova 2155/3 182 23 Prague 8 Czech Republic
| | - Vlastimil Dorčák
- Institute of Biophysics of the CAS; Královopolská 135 612 65 Brno Czech Republic
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12
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Vasilescu A, Ye R, Boulahneche S, Lamraoui S, Jijie R, Medjram MS, Gáspár S, Singh SK, Kurungot S, Melinte S, Boukherroub R, Szunerits S. Porous reduced graphene oxide modified electrodes for the analysis of protein aggregation. Part 2: Application to the analysis of calcitonin containing pharmaceutical formulation. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.02.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Vasilescu A, Boulahneche S, Chekin F, Gáspár S, Medjram MS, Diagne AA, Singh SK, Kurungot S, Boukherroub R, Szunerits S. Porous reduced graphene oxide modified electrodes for the analysis of protein aggregation. Part 1: Lysozyme aggregation at pH 2 and 7.4. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.09.083] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Cheng XR, Kerman K. Electrochemical Detection of Interaction Between α-Synuclein and Clioquinol. ELECTROANAL 2015. [DOI: 10.1002/elan.201500044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Paleček E, Tkáč J, Bartošík M, Bertók T, Ostatná V, Paleček J. Electrochemistry of nonconjugated proteins and glycoproteins. Toward sensors for biomedicine and glycomics. Chem Rev 2015; 115:2045-108. [PMID: 25659975 PMCID: PMC4360380 DOI: 10.1021/cr500279h] [Citation(s) in RCA: 209] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Indexed: 02/07/2023]
Affiliation(s)
- Emil Paleček
- Institute
of Biophysics Academy of Science of the Czech Republic, v.v.i., Královopolská
135, 612 65 Brno, Czech Republic
| | - Jan Tkáč
- Institute
of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38 Bratislava, Slovakia
| | - Martin Bartošík
- Regional
Centre for Applied Molecular Oncology, Masaryk
Memorial Cancer Institute, Žlutý kopec 7, 656 53 Brno, Czech Republic
| | - Tomáš Bertók
- Institute
of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38 Bratislava, Slovakia
| | - Veronika Ostatná
- Institute
of Biophysics Academy of Science of the Czech Republic, v.v.i., Královopolská
135, 612 65 Brno, Czech Republic
| | - Jan Paleček
- Central
European Institute of Technology, Masaryk
University, Kamenice
5, 625 00 Brno, Czech Republic
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16
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Toh RJ, Peng WK, Han J, Pumera M. Direct in vivo electrochemical detection of haemoglobin in red blood cells. Sci Rep 2014; 4:6209. [PMID: 25163492 PMCID: PMC4147368 DOI: 10.1038/srep06209] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Accepted: 07/22/2014] [Indexed: 11/29/2022] Open
Abstract
The electrochemical behavior of iron ion in haemoglobin provides insight to the chemical activity in the red blood cell which is important in the field of hematology. Herein, the detection of haemoglobin in human red blood cells on glassy carbon electrode (GC) was demonstrated. Red blood cells or raw blood cells was immobilized on a glassy carbon electrode surface with Nafion films employed to sandwich the layer of biological sample firmly on the electrode surface. Cyclic voltammetry (CV) analyses revealed a well-defined reduction peak for haemoglobin at about -0.30 V (vs. Ag/AgCl) at the red blood cell (GC-Nf-RBC-3Nf) and blood (GC-Nf-B-3Nf) film modified GCE in a pH 3.5 phosphate buffer solution. We further demonstrated that the complex biological conditions of a human red blood cell displayed no interference with the detection of haemoglobin. Such findings shall have an implication on the possibilities of studying the electrochemical behaviour of haemoglobin directly from human blood, for various scientific and clinical purposes.
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Affiliation(s)
- Rou Jun Toh
- Division of Chemistry & Biological Chemistry School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
- BioSystems & Micromechanics IRG (BioSyM), Singapore-MIT Alliance for Research and Technology (SMART) Centre, 1 CREATE Way, #04-13/14 Enterprise Wing, 138602, Singapore
| | - Weng Kung Peng
- BioSystems & Micromechanics IRG (BioSyM), Singapore-MIT Alliance for Research and Technology (SMART) Centre, 1 CREATE Way, #04-13/14 Enterprise Wing, 138602, Singapore
| | - Jongyoon Han
- BioSystems & Micromechanics IRG (BioSyM), Singapore-MIT Alliance for Research and Technology (SMART) Centre, 1 CREATE Way, #04-13/14 Enterprise Wing, 138602, Singapore
- Department of Electrical Engineering and Computer Science, Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Martin Pumera
- Division of Chemistry & Biological Chemistry School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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17
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Chen S, Zhang L, Long Y, Zhou F. Electroanalytical Sensors and Methods for Assays and Studies of Neurological Biomarkers. ELECTROANAL 2014. [DOI: 10.1002/elan.201400040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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18
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Lopes P, Dyrnesli H, Lorenzen N, Otzen D, Ferapontova EE. Electrochemical analysis of the fibrillation of Parkinson's disease α-synuclein. Analyst 2014; 139:749-56. [DOI: 10.1039/c3an01616a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Kurzątkowska K, Ostatná V, Hamley IW, Doneux T, Paleček E. Electrochemical sensing of 2D condensation in amyloid peptides. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.05.057] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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20
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Vargová V, Zivanović M, Dorčák V, Paleček E, Ostatná V. Catalysis of Hydrogen Evolution by Polylysine, Polyarginine and Polyhistidine at Mercury Electrodes. ELECTROANAL 2013. [DOI: 10.1002/elan.201300170] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Černocká H, Ostatná V, Paleček E. Enzymatic activity and catalytic hydrogen evolution in reduced and oxidized urease at mercury surfaces. Anal Chim Acta 2013; 789:41-6. [DOI: 10.1016/j.aca.2013.06.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 06/08/2013] [Accepted: 06/16/2013] [Indexed: 10/26/2022]
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22
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Advances in electrochemical detection for study of neurodegenerative disorders. Anal Bioanal Chem 2013; 405:5725-41. [DOI: 10.1007/s00216-013-6904-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 03/05/2013] [Accepted: 03/06/2013] [Indexed: 12/30/2022]
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23
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Vacek J, Zatloukalova M, Havlikova M, Ulrichova J, Kubala M. Changes in the intrinsic electrocatalytic nature of Na+/K+ ATPase reflect structural changes on ATP-binding: Electrochemical label-free approach. Electrochem commun 2013. [DOI: 10.1016/j.elecom.2012.11.020] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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24
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German N, Kausaite-Minkstimiene A, Kirlyte J, Makaraviciute A, Ramanavicius A, Mikoliunaite L, Ramanaviciene A. Determination of antibodies against human growth hormone using a direct immunoassay format and different electrochemical methods. Analyst 2013; 138:1427-33. [DOI: 10.1039/c2an36682g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Somji M, Dounin V, Muench SB, Schulze H, Bachmann TT, Kerman K. Electroanalysis of amino acid substitutions in bioengineered acetylcholinesterase. Bioelectrochemistry 2012; 88:110-3. [DOI: 10.1016/j.bioelechem.2012.07.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2012] [Revised: 07/01/2012] [Accepted: 07/13/2012] [Indexed: 10/28/2022]
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26
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Electrocatalytic oxidation of tyrosines shows signal enhancement in label-free protein biosensors. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2012.07.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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27
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Chan T, Chow AM, Cheng XR, Tang DWF, Brown IR, Kerman K. Oxidative stress effect of dopamine on α-synuclein: electroanalysis of solvent interactions. ACS Chem Neurosci 2012; 3:569-74. [PMID: 22860226 DOI: 10.1021/cn300034t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Accepted: 05/16/2012] [Indexed: 11/30/2022] Open
Abstract
The interaction of dopamine (DA) and α-synuclein (α-S) can lead to protein misfolding and neuronal death triggered by oxidative stress relevant to the progression of Parkinson's disease (PD). In this study, interfacial properties associated with DA-induced α-S aggregation under various solution conditions (i.e., pH, ionic strength) were investigated in vitro. The electrochemical oxidation of tyrosine (Tyr) residues in α-S was detected in the presence of DA. DA concentration dependence was analyzed and found to significantly affect α-S aggregation pathways. At low pH, DA was shown to be stable and produced no observable difference in interfacial properties. Between pH 7 and 11, DA promoted α-S aggregation. Significant differences in oxidation current signals in response to high pH and ionic strength suggested the importance of initial interactions in the stabilization of toxic oligomeric structures and subsequent off-pathways of α-S. Our results demonstrate the importance of solution interactions with α-S and the unique information that electrochemical techniques can provide for the investigation of α-S aggregation at early stages, an important step toward the development of future PD therapeutics.
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Affiliation(s)
- Tiffiny Chan
- Department
of Physical and Environmental Sciences, ‡Centre for the Neurobiology of
Stress, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail,
Toronto, ON, M1C 1A4 Canada
| | - Ari M. Chow
- Department
of Physical and Environmental Sciences, ‡Centre for the Neurobiology of
Stress, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail,
Toronto, ON, M1C 1A4 Canada
| | - Xin R. Cheng
- Department
of Physical and Environmental Sciences, ‡Centre for the Neurobiology of
Stress, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail,
Toronto, ON, M1C 1A4 Canada
| | - Derek W. F. Tang
- Department
of Physical and Environmental Sciences, ‡Centre for the Neurobiology of
Stress, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail,
Toronto, ON, M1C 1A4 Canada
| | - Ian R. Brown
- Department
of Physical and Environmental Sciences, ‡Centre for the Neurobiology of
Stress, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail,
Toronto, ON, M1C 1A4 Canada
| | - Kagan Kerman
- Department
of Physical and Environmental Sciences, ‡Centre for the Neurobiology of
Stress, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail,
Toronto, ON, M1C 1A4 Canada
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Zatloukalová M, Orolinová E, Kubala M, Hrbáč J, Vacek J. Electrochemical Determination of Transmembrane Protein Na+/K+-ATPase and Its Cytoplasmic Loop C45. ELECTROANAL 2012. [DOI: 10.1002/elan.201200165] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Ostatná V, Černocká H, Kurzątkowska K, Paleček E. Native and denatured forms of proteins can be discriminated at edge plane carbon electrodes. Anal Chim Acta 2012; 735:31-6. [DOI: 10.1016/j.aca.2012.05.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 05/04/2012] [Accepted: 05/11/2012] [Indexed: 11/26/2022]
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30
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References. Anal Chem 2012. [DOI: 10.1201/b11478-14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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de la Fuente E, Adura C, Kogan MJ, Bollo S. Carbon Nanotubes Electrochemistry Allows the In Situ Evaluation of the Effect of β-Sheet Breakers on the Aggregation Process of β-Amyloid. ELECTROANAL 2012. [DOI: 10.1002/elan.201100607] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Paleček E, Bartošík M, Ostatná V, Trefulka M. Electrocatalysis in proteins, nucleic acids and carbohydrates. CHEM REC 2012; 12:27-45. [DOI: 10.1002/tcr.201100029] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Indexed: 11/06/2022]
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33
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On the mechanism of hydrogen evolution catalysis by proteins: A case study with bovine serum albumin. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.08.017] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Xia N, Liu L, Harrington MG, Wang J, Zhou F. Regenerable and simultaneous surface plasmon resonance detection of aβ(1-40) and aβ(1-42) peptides in cerebrospinal fluids with signal amplification by streptavidin conjugated to an N-terminus-specific antibody. Anal Chem 2010; 82:10151-7. [PMID: 21073166 DOI: 10.1021/ac102257m] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A major constituent in the deposit of the brain in a patient with Alzheimer's disease (AD) is the aggregates/fibrils of amyloid-β (Aβ) peptides containing 39-43 amino acids. The total Aβ levels and the concentration ratio between the most abundant Aβ(1-40) peptide and the more aggregation-prone Aβ(1-42) in body fluids (e.g., cerebrospinal fluid or CSF) have been suggested as possible criteria for early diagnosis of AD. By immobilizing capture antibodies specific to the two peptides in separate fluidic channels, surface plasmon resonance (SPR) has been used to quantify Aβ(1-40) and Aβ(1-42) present in CSF samples collected from AD patients and healthy donors. With signal amplification by streptavidin conjugated to an antibody that is selective to the common N-terminus of the Aβ peptides, concentrations as low as 20 pM can be readily measured. The range of Aβ peptide concentrations measurable by this method spans 4 orders of magnitude. The ability of regenerating the sensor surface for repeated measurements not only improves the reproducibility but also enhances the sample throughput. Our data reveal that the ratio of Aβ(1-40) concentration versus Aβ(1-42) concentration in CSF samples from AD patients is almost twice as high as that from healthy persons. In contrast to the commonly used enzyme-linked immunosorbent assay (ELISA), SPR obviates the need of a more expensive and less stable enzyme conjugate and the use of carcinogenic substrate for the signal detection and allows the binding events to be monitored in real time.
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Affiliation(s)
- Ning Xia
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People's Republic of China 410083
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35
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Chan T, Chow AM, Tang DW, Li Q, Wang X, Brown IR, Kerman K. Interaction of baicalein and copper with α-synuclein: Electrochemical approach to Parkinson’s Disease. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.07.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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36
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Mai Z, Zhao X, Dai Z, Zou X. Investigation of the chloride effect on hemoglobin by adsorptive transfer voltammetry. Anal Biochem 2010; 399:23-9. [PMID: 20005864 DOI: 10.1016/j.ab.2009.10.049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Revised: 10/15/2009] [Accepted: 10/16/2009] [Indexed: 11/28/2022]
Abstract
A strategy of ex situ electrochemical method has been proposed for investigating the chloride effect on hemoglobin (Hb). Unlike the common electrochemical method that measures the chloride effect on Hb in bulk solution (in situ), the effects of chloride anion on Hb were investigated ex situ by adsorptive transfer voltammetry (AdTV) in this work. Gold electrode modified by self-assembled monolayer of 3-mercaptopropanoic acid (AuE/MPA) was prepared and then incubated in a series of Hb solutions containing different concentrations of chloride anion for adsorbing Hb-Cl (AuE/MPA/Hb-Cl). The resulting electrode was then measured in phosphate buffer solution by cyclic voltammetry. The corresponding voltammograms showed obvious promotion of the direct electron transfer of Hb with remarkable increase of peak currents, decrease of peak-to-peak separations, and negative shift of the formal potentials. As complementation, the adsorption behavior of Hb-Cl on AuE/MPA, the structural information of Hb-Cl, and the electrocatalytic ability of AuE/MPA/Hb-Cl toward hydrogen peroxide were investigated by surface plasmon resonance, circular dichroism spectrum, ultraviolet-visible spectrum and amperometry, respectively. The results indicate that the chloride effect resulted in more electroactive sites of Hb on the surface of electrode. Meanwhile, the specific and nonspecific interactions between Hb and chloride anion can be discriminated from the electrochemical parameters obtained by AdTV.
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Affiliation(s)
- Zhibin Mai
- School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
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37
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Doneux T, Dorcák V, Palecek E. Influence of the interfacial peptide organization on the catalysis of hydrogen evolution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1347-1353. [PMID: 19743826 DOI: 10.1021/la9024603] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The hydrogen evolution reaction is catalyzed by peptides and proteins adsorbed on electrode materials with high overpotentials for this reaction, such as mercury. The catalytic response characteristics are known to be very sensitive to the composition and structure of the investigated biomolecule, opening the way to the implementation of a label-free, reagentless electroanalytical method in protein analysis. Herein, it is shown using the model peptide Cys-Ala-Ala-Ala-Ala-Ala that the interfacial organization significantly influences the catalytic behavior. This peptide forms at the electrode two distinct films, depending on the concentration and accumulation time. The low-coverage film, composed of flat-lying molecules (area per molecule of approximately 250-290 A(2)), yields a well-defined catalytic peak at potentials around -1.75 V. The high-coverage film, made of upright-oriented peptides (area per molecule of approximately 43 A(2)), is catalytically more active and the peak is observed at potentials less negative by approximately 0.4 V. The higher activity, evidenced by constant-current chronopotentiometry and cyclic voltammetry, is attributed to an increase in the acid dissociation constant of the amino acid residues as a result of the low permittivity of the interfacial region, as inferred from impedance measurements. An analogy is made to the known differences in acidic-basic behaviors of solvent-exposed and hydrophobic domains of proteins.
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Affiliation(s)
- Th Doneux
- Institute of Biophysics ASCR, v.v.i., 612 65 Brno, Czech Republic
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38
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Dorčák V, Bartošík M, Ostatná V, Paleček E, Heyrovský M. Interaction of Biomacromolecules with Surfaces Viewed by Electrochemical Methods. ELECTROANAL 2009. [DOI: 10.1002/elan.200804433] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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39
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Huska D, Adam V, Zitka O, Kukacka J, Prusa R, Kizek R. Chronopotentiometric Stripping Analysis of Gelatinase B, Collagen and Their Interaction. ELECTROANAL 2009. [DOI: 10.1002/elan.200804440] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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40
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Dorčák V, Paleček E. Electrochemical Determination of Thioredoxin Redox States. Anal Chem 2009; 81:1543-8. [DOI: 10.1021/ac802274p] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Vlastimil Dorčák
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i, Královopolská 135, CZ-612 65 Brno, Czech Republic
| | - Emil Paleček
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i, Královopolská 135, CZ-612 65 Brno, Czech Republic
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41
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Paleček E, Ostatná V. Potential-dependent surface denaturation of BSA in acid media. Analyst 2009; 134:2076-80. [DOI: 10.1039/b912602c] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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42
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Determination of Vitamin C (Ascorbic Acid) Using High Performance Liquid Chromatography Coupled with Electrochemical Detection. SENSORS 2008; 8:7097-7112. [PMID: 27873917 PMCID: PMC3787433 DOI: 10.3390/s8117097] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2008] [Revised: 11/04/2008] [Accepted: 11/06/2008] [Indexed: 11/16/2022]
Abstract
Vitamin C (ascorbic acid, ascorbate, AA) is a water soluble organic compound that participates in many biological processes. The main aim of this paper was to utilize two electrochemical detectors (amperometric - Coulouchem III and coulometric - CoulArray) coupled with flow injection analysis for the detection of ascorbic acid. Primarily, we optimized the experimental conditions. The optimized conditions were as follows: detector potential 100 mV, temperature 25 °C, mobile phase 0.09% TFA:ACN, 3:97 (v/v) and flow rate 0.13 mL·min-1. The tangents of the calibration curves were 0.3788 for the coulometric method and 0.0136 for the amperometric one. The tangent of the calibration curve measured by the coulometric detector was almost 30 times higher than the tangent measured by the amperometric detector. Consequently, we coupled a CoulArray electrochemical detector with high performance liquid chromatography and estimated the detection limit for AA as 90 nM (450 fmol per 5 μL injection). The method was used for the determination of vitamin C in a pharmaceutical preparations (98 ± 2 mg per tablet), in oranges (Citrus aurantium) (varied from 30 to 56 mg/100 g fresh weight), in apples (Malus sp.) (varied from 11 to 19 mg/100 g fresh weight), and in human blood serum (varied from 38 to 78 μM). The recoveries were also determined.
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43
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Geng J, Yu H, Ren J, Qu X. Rapid label-free detection of metal-induced Alzheimer’s amyloid β peptide aggregation by electrochemical method. Electrochem commun 2008. [DOI: 10.1016/j.elecom.2008.09.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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44
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Ostatná V, Kuralay F, Trnková L, Paleček E. Constant Current Chronopotentiometry and Voltammetry of Native and Denatured Serum Albumin at Mercury and Carbon Electrodes. ELECTROANAL 2008. [DOI: 10.1002/elan.200804206] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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45
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Fojta M, Billová S, Havran L, Pivoňková H, Černocká H, Horáková P, Paleček E. Osmium Tetroxide, 2,2′-Bipyridine: Electroactive Marker for Probing Accessibility of Tryptophan Residues in Proteins. Anal Chem 2008; 80:4598-605. [DOI: 10.1021/ac800527u] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Miroslav Fojta
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Kralovopolska 135, 612 65 Brno, Czech Republic, and Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Sabina Billová
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Kralovopolska 135, 612 65 Brno, Czech Republic, and Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Luděk Havran
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Kralovopolska 135, 612 65 Brno, Czech Republic, and Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Hana Pivoňková
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Kralovopolska 135, 612 65 Brno, Czech Republic, and Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Hana Černocká
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Kralovopolska 135, 612 65 Brno, Czech Republic, and Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Petra Horáková
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Kralovopolska 135, 612 65 Brno, Czech Republic, and Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Emil Paleček
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Kralovopolska 135, 612 65 Brno, Czech Republic, and Department of Functional Genomics and Proteomics, Institute of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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Multiparametric fluorescence detection of early stages in the amyloid protein aggregation of pyrene-labeled alpha-synuclein. J Mol Biol 2008; 378:1064-73. [PMID: 18433772 DOI: 10.1016/j.jmb.2008.03.034] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2007] [Revised: 03/13/2008] [Accepted: 03/16/2008] [Indexed: 11/23/2022]
Abstract
The aggregation of alpha-synuclein, a presynaptic protein, has an important role in the etiology of Parkinson's disease. Oligomers or protofibrils adopting the cross-beta-sheet structure characteristic of fibrillating amyloid proteins are presumed to be the primary cytotoxic species. Current techniques for monitoring the kinetics of alpha-synuclein aggregation based on fluorescent dyes such as Thioflavin-T and Congo red detect only the terminal fibrillar species, are discontinuous and notoriously irreproducible. We have devised a new fluorescence aggregation assay that is continuous and provides a large set of fluorescence parameters sensitive to the presence of oligomeric intermediates as well as fibrils. The approach involves tagging functionally neutral Ala-to-Cys variants of alpha-synuclein with the long-lifetime fluorophore pyrene. Upon induction of aggregation at 37 degrees C, the entire family of steady-state descriptors of pyrene emission (monomer intensity, solvent polarity ratio (I(I)/I(III)), and anisotropy; and excimer intensity) change dramatically, particularly during the early stages in which oligomeric intermediates form and evolve. The pyrene probe senses a progressive decrease in polarity, an increase in molecular mass and close intermolecular association in a manner dependent on position in the sequence and the presence of point mutations. The time-resolved decays (0-160 ns) of intensity and anisotropy exhibited complex, characteristic features. The new assay constitutes a convenient platform for the high-throughput screening of agents useful in the diagnosis and therapy of Parkinson's disease as well as in basic investigations.
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Paleček E, Ostatná V, Masařík M, Bertoncini CW, Jovin TM. Changes in interfacial properties of α-synuclein preceding its aggregation. Analyst 2008; 133:76-84. [DOI: 10.1039/b712812f] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Qu N, Wan B, Guo LH. Label-free electrochemical differentiation of phosphorylated and non-phosphorylated peptide by electro-catalyzed tyrosine oxidation. Analyst 2008; 133:1246-9. [DOI: 10.1039/b807133k] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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50
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SAITO M, KITSUNAI M, AHMED MU, SUGIYAMA S, TAMIYA E. Label-free Electrochemical Detection for Food Allergen using Screen Printed Carbon Electrode. ELECTROCHEMISTRY 2008. [DOI: 10.5796/electrochemistry.76.606] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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