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Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering

Organophosphate nerve agents rapidly inhibit cholinesterases thereby destroying the ability to sustain life. Strong nucleophiles, such as oximes, have been used as therapeutic reactivators of cholinesterase‐organophosphate complexes, but suffer from short half‐lives and limited efficacy across the b...

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Autores principales: Zhang, Libin, Baker, Stefanie L., Murata, Hironobu, Harris, Nicholas, Ji, Weihang, Amitai, Gabriel, Matyjaszewski, Krzysztof, Russell, Alan J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947490/
https://www.ncbi.nlm.nih.gov/pubmed/31921563
http://dx.doi.org/10.1002/advs.201901904
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author Zhang, Libin
Baker, Stefanie L.
Murata, Hironobu
Harris, Nicholas
Ji, Weihang
Amitai, Gabriel
Matyjaszewski, Krzysztof
Russell, Alan J.
author_facet Zhang, Libin
Baker, Stefanie L.
Murata, Hironobu
Harris, Nicholas
Ji, Weihang
Amitai, Gabriel
Matyjaszewski, Krzysztof
Russell, Alan J.
author_sort Zhang, Libin
collection PubMed
description Organophosphate nerve agents rapidly inhibit cholinesterases thereby destroying the ability to sustain life. Strong nucleophiles, such as oximes, have been used as therapeutic reactivators of cholinesterase‐organophosphate complexes, but suffer from short half‐lives and limited efficacy across the broad spectrum of organophosphate nerve agents. Cholinesterases have been used as long‐lived therapeutic bioscavengers for unreacted organophosphates with limited success because they react with organophosphate nerve agents with one‐to‐one stoichiometries. The chemical power of nucleophilic reactivators is coupled to long‐lived bioscavengers by designing and synthesizing cholinesterase‐polymer‐oxime conjugates using atom transfer radical polymerization and azide‐alkyne “click” chemistry. Detailed kinetic studies show that butyrylcholinesterase‐polymer‐oxime activity is dependent on the electrostatic properties of the polymers and the amount of oxime within the conjugate. The covalent coupling of oxime‐containing polymers to the surface of butyrylcholinesterase slows the rate of inactivation of paraoxon, a model nerve agent. Furthermore, when the enzyme is covalently inhibited by paraoxon, the covalently attached oxime induced inter‐ and intramolecular reactivation. Intramolecular reactivation will open the door to the generation of a new class of nerve agent scavengers that couple the speed and selectivity of biology to the ruggedness and simplicity of synthetic chemicals.
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spelling pubmed-69474902020-01-09 Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering Zhang, Libin Baker, Stefanie L. Murata, Hironobu Harris, Nicholas Ji, Weihang Amitai, Gabriel Matyjaszewski, Krzysztof Russell, Alan J. Adv Sci (Weinh) Full Papers Organophosphate nerve agents rapidly inhibit cholinesterases thereby destroying the ability to sustain life. Strong nucleophiles, such as oximes, have been used as therapeutic reactivators of cholinesterase‐organophosphate complexes, but suffer from short half‐lives and limited efficacy across the broad spectrum of organophosphate nerve agents. Cholinesterases have been used as long‐lived therapeutic bioscavengers for unreacted organophosphates with limited success because they react with organophosphate nerve agents with one‐to‐one stoichiometries. The chemical power of nucleophilic reactivators is coupled to long‐lived bioscavengers by designing and synthesizing cholinesterase‐polymer‐oxime conjugates using atom transfer radical polymerization and azide‐alkyne “click” chemistry. Detailed kinetic studies show that butyrylcholinesterase‐polymer‐oxime activity is dependent on the electrostatic properties of the polymers and the amount of oxime within the conjugate. The covalent coupling of oxime‐containing polymers to the surface of butyrylcholinesterase slows the rate of inactivation of paraoxon, a model nerve agent. Furthermore, when the enzyme is covalently inhibited by paraoxon, the covalently attached oxime induced inter‐ and intramolecular reactivation. Intramolecular reactivation will open the door to the generation of a new class of nerve agent scavengers that couple the speed and selectivity of biology to the ruggedness and simplicity of synthetic chemicals. John Wiley and Sons Inc. 2019-11-13 /pmc/articles/PMC6947490/ /pubmed/31921563 http://dx.doi.org/10.1002/advs.201901904 Text en © 2019 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Zhang, Libin
Baker, Stefanie L.
Murata, Hironobu
Harris, Nicholas
Ji, Weihang
Amitai, Gabriel
Matyjaszewski, Krzysztof
Russell, Alan J.
Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering
title Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering
title_full Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering
title_fullStr Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering
title_full_unstemmed Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering
title_short Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer‐Based Protein Engineering
title_sort tuning butyrylcholinesterase inactivation and reactivation by polymer‐based protein engineering
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947490/
https://www.ncbi.nlm.nih.gov/pubmed/31921563
http://dx.doi.org/10.1002/advs.201901904
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