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Ultrasensitive Acetylcholinesterase detection based on a surface-enhanced Raman scattering lever strategy for identifying nerve fibers. Talanta 2023; 252:123867. [DOI: 10.1016/j.talanta.2022.123867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 08/15/2022] [Accepted: 08/18/2022] [Indexed: 11/20/2022]
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Highly stable acetylcholinesterase electrochemical biosensor based on polymerized ionic liquids microgel for pesticides detection. Mikrochim Acta 2022; 189:300. [PMID: 35904635 DOI: 10.1007/s00604-022-05383-6] [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: 01/22/2022] [Accepted: 06/18/2022] [Indexed: 10/16/2022]
Abstract
A highly stable electrochemical biosensor for pesticide detection was developed. For the first time polymeric ionic liquids (PILs) were introduced to construct an acetylcholinesterase (AChE) biosensor . AChE was entrapped in PILs microspheres through an emulsion polymerization reaction, where negatively charged Au nanoparticles (Au NPs) can be immobilized by the positively charged PILs, leading to improved catalytic performance. The results suggest that the positively charged PILs not only provide a biocompatible microenvironment around the enzyme molecule, stabilizing its biological activity and preventing its leakage, but also act as a modifiable interface allowing other components with electron transport properties to be loaded onto the polymer substrate, thus providing an efficient electron transport channel for the entrapped enzyme. More notably, when AChE was immobilized in a positively charged environment, the active site is closer to the electrode, promoting faster electron transfer. The detection limits of the constructed electrochemical biosensor AChE@PILs@Au NPs/GCE toward carbaryl and dichlorvos (DDVP) were 5.0 × 10-2 ng ml-1 and 3.9 × 10-2 ng ml-1, in a wide linear range of 6.3 × 10-2-8.8 × 102 ng ml-1 and 1.3 × 10-1-1.4 × 103 ng ml-1, respectively. More importantly, the biosensor has high thermal and storage stability, which facilitates rapid field analysis of fruits and vegetables in a variety of climates. In addition, the biosensor reported has good repeatability and selectivity and has high accuracy in the analysis of peaches, tap water, and other types of samples.
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Trapp M, Trovaslet M, Nachon F, Koza MM, van Eijck L, Hill F, Weik M, Masson P, Tehei M, Peters J. Energy Landscapes of Human Acetylcholinesterase and Its Huperzine A-Inhibited Counterpart. J Phys Chem B 2012. [DOI: 10.1021/jp304704h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcus Trapp
- Comissariat
à l’Energie
Atomique, Institut de Biologie Structurale, F-38054 Grenoble, France
- Centre National De La Recherche Scientifique, UMR5075, F-38027 Grenoble,
France
- Université Joseph Fourier, UFR PhITEM, F-38041 Grenoble Cédex
9, France
- Institut Laue Langevin, F-38042 Grenoble Cédex
9, France
| | - Marie Trovaslet
- Institut de Recherche Biomédicale des Armées, F-38700 La Tronche,
France
| | - Florian Nachon
- Institut de Recherche Biomédicale des Armées, F-38700 La Tronche,
France
| | - Marek M. Koza
- Institut Laue Langevin, F-38042 Grenoble Cédex
9, France
| | - Lambert van Eijck
- Delft University of Technology, Faculty of Applied Sciences, RST/NPM2
Mekelweg 15, 2629JB Delft Netherlands
| | - Flynn Hill
- School of Chemistry and
Centre for
Medical Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Martin Weik
- Comissariat
à l’Energie
Atomique, Institut de Biologie Structurale, F-38054 Grenoble, France
- Centre National De La Recherche Scientifique, UMR5075, F-38027 Grenoble,
France
- Université Joseph Fourier, UFR PhITEM, F-38041 Grenoble Cédex
9, France
| | - Patrick Masson
- Comissariat
à l’Energie
Atomique, Institut de Biologie Structurale, F-38054 Grenoble, France
- Centre National De La Recherche Scientifique, UMR5075, F-38027 Grenoble,
France
- Université Joseph Fourier, UFR PhITEM, F-38041 Grenoble Cédex
9, France
- Institut de Recherche Biomédicale des Armées, F-38700 La Tronche,
France
| | - Moeava Tehei
- School of Chemistry and
Centre for
Medical Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia
- Australian Institute of Nuclear Science and Engineering (AINSE), Menai, NSW,
Australia
| | - Judith Peters
- Comissariat
à l’Energie
Atomique, Institut de Biologie Structurale, F-38054 Grenoble, France
- Centre National De La Recherche Scientifique, UMR5075, F-38027 Grenoble,
France
- Université Joseph Fourier, UFR PhITEM, F-38041 Grenoble Cédex
9, France
- Institut Laue Langevin, F-38042 Grenoble Cédex
9, France
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Hatzimarinaki M, Vamvakaki V, Chaniotakis N. Spectro-electrochemical studies of acetylcholinesterase in carbon nanofiber-bioinspired silica nanocomposites for biosensor development. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b811350e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gróf P, Aslanian D, Rontó G. Changes of phage T7 nucleoprotein structure at low ionic strength. A Raman spectroscopic study. BIOCHIMICA ET BIOPHYSICA ACTA 1996; 1289:95-104. [PMID: 8605239 DOI: 10.1016/0304-4165(95)00151-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
To detect changes in DNA and/or protein structures of phage T7 under different ionic strength, Raman spectra of phage T7 have been recorded in solutions of three different NaCl + Tris concentrations. Iterative Jansson-Van Cittert deconvolution, as well as decomposition methods have been used to quantify changes in DNA structure. Significant modifications in ratios of contributions from 675 and 685 per cm vibrations, as well as in the DNA backbone vibrations, characteristic for B-DNA, near 835 per cm frequency have been found. Changes of the base electronic structure were identified in the interval between 1280 and 1400 cm(-1). Estimation of the overall protein structure suggests predominant beta-sheet content.
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Affiliation(s)
- P Gróf
- Institute of Biophysics, Semmelweis Medical University, Budapest, Hungary
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Aslanian D, Gróf P, Renault F, Masson P. Raman spectroscopic study of conjugates of butyrylcholinesterase with organophosphates. BIOCHIMICA ET BIOPHYSICA ACTA 1995; 1249:37-44. [PMID: 7766682 DOI: 10.1016/0167-4838(95)00035-s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Raman spectra of human butyrylcholinesterase (BuChE; E.C. 3.1.1.8) were analyzed in the native state and after conjugation with organophosphates (soman, DFP and paraoxon). The secondary structure of the native BuChE in Tris-HCl buffer (pH 7.5), determined from analysis of the amide I polypeptide vibration band, indicates 47% alpha-helices, 26% beta-sheets, 16% turns and 12% undefined structure. We obtained the same values for paraoxon-phosphorylated BuChE, but 39% helical structure, 31% beta-sheets, 17% turns and 13% undefined structure for 'aged' DFP-BuChE conjugates and 36% helical structure, 34% beta-sheets, 20% turns and 10% undefined structure for 'aged' soman-BuChE conjugates. The approximately 10% decrease of alpha-helical structure observed upon phosphorylation by DFP and phosphonylation by soman, probably corresponds to the 'aging' process, which does not take place in the case of paraoxon. Considerable differences have been observed between native, paraoxon inhibited and 'aged' BuChE in aromatic ring vibrations, suggesting that the dealkylation of organophosphate conjugates modifies the environment or the interactions of aromatic amino-acid residues. In the aliphatic side chains an increase of the number of gauche configurations has been observed in 'aged' DFP-BuChE and soman-BuChE.
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Affiliation(s)
- D Aslanian
- Laboratoire de Physique des Solides, Associé au CNRS, Université Pierre et Marie Curie, Paris, France
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Massoulié J, Pezzementi L, Bon S, Krejci E, Vallette FM. Molecular and cellular biology of cholinesterases. Prog Neurobiol 1993; 41:31-91. [PMID: 8321908 DOI: 10.1016/0301-0082(93)90040-y] [Citation(s) in RCA: 829] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- J Massoulié
- Laboratoire de Neurobiologie, CNRS URA 295, Ecole Normale Supérieure, Paris, France
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Aslanian D, Grof P, Galzi JL, Changeux JP. A Raman spectroscopic study of acetylcholine receptor-rich membranes from Torpedo marmorata. Interaction of the receptor with carbamylcholine and (+)-tubocurarine. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1148:291-302. [PMID: 8504123 DOI: 10.1016/0005-2736(93)90142-m] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Raman spectroscopy is used to determine structural features of alkali-treated subsynaptic membrane fragments from Torpedo marmorata electric organ, rich in native functional AcChR. Distinct vibrations attributable to the membrane proteins and lipids were identified and studied before and after addition of the agonist carbamylcholine and the competitive antagonist (+)-tubocurarine. The protein secondary structure determined by using amide-I polypeptide vibrational analysis, indicates 47% alpha-helices, 25% beta-sheets, 18% turns and 11% undefined structure. The secondary structure of the AcChR molecule was not subject to large modifications upon addition of carbamylcholine. But, the presence of the (+)-tubocurarine leads to detectable changes in the amide-I region which might be interpreted as reflecting different contributions of alpha-helices and turns in the secondary structure. In addition, Raman spectra provide information about the environment of aromatic amino acids (tyrosine and tryptophan), the (C-C) bonds, the CH2 and CH3 groups of aliphatic side chains, as well as the disulfide (S-S) and cystein (C-S) bonds. The tyrosines seem 'exposed' to the aqueous medium. The Raman spectra of the AcChR-carbamylcholine complex suggest 'exposed' tryptophans, while those of the unliganded membrane-bound AcChR or of the receptor with (+)-tubocurarine are shown 'buried'. The disulfide bridges in the AcChR subunits show identical conformation in the absence and presence of carbamylcholine. On the contrary, considerable changes are found in the AcChR-(+)-tubocurarine complex. Carbamylcholine and especially (+)-tubocurarine decrease lipid fluidity.
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Affiliation(s)
- D Aslanian
- Laboratoire de Physique des Solides, Université Pierre et Marie Curie, Paris, France
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Görne-Tschelnokow U, Naumann D, Weise C, Hucho F. Secondary structure and temperature behaviour of acetylcholinesterase. Studies by Fourier-transform infrared spectroscopy. EUROPEAN JOURNAL OF BIOCHEMISTRY 1993; 213:1235-42. [PMID: 8389298 DOI: 10.1111/j.1432-1033.1993.tb17874.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The secondary structure of the acetylcholinesterase and its temperature behaviour have been investigated using Fourier-transform infrared (FTIR) spectroscopy. The data are compared to the structure obtained by X-ray analysis of the crystalline enzyme. The secondary structure was determined using the spectral features observed in the amide-I band (H2O buffer) and amide-I' band (D2O buffer) at 1600-1700 cm-1, taking advantage of resolution-enhancement techniques along with least-squares band-fitting procedures. The relative amounts of different secondary-structure elements, 34-36% for alpha-helices, 19-25% for beta-sheets, 15-16% for turns and 13-17% for irregular structures, were estimated. These data, obtained with the enzyme in solution, correlate well with X-ray data of the crystalline protein [Sussman, J. L., Hard, M., Frolow, F., Oefner, C., Goldman, A., Toker, L. & Silman, I. (1991) Science 253, 872-879]. These results are also in good agreement with those obtained by computing the psi and phi angles of the peptide backbone using the Kabsch and Sanders method [Kabsch, W. & Sanders, C. (1983) Biopolymers 22, 2577-2637]. In conjunction with the X-ray data, two bands in the FTIR spectra were assigned to different populations of long and short alpha-helices. Until now this phenomenon has only been described by theoretical calculations [Nevskaya, N. A. & Chirgadze, Yu. N. (1976) Biopolymers 15, 637-648]. The relationship between the thermally induced loss of enzyme activity and secondary-structure changes has also been investigated. The decrease in enzyme activity to zero at 30-40 degrees C was accompanied only by minor changes in the secondary structure. At 55-60 degrees C, denaturation of AChE occurs. In this temperature range, all bands assigned to the various secondary-structure elements abruptly disappear in a co-operative and irreversible manner, whereas the beta-aggregation bands (at 1622 cm-1 and the corresponding high-frequency band) increase in intensity at the same rate.
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