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Sun T, Zhen T, Harakandi CH, Wang L, Guo H, Chen Y, Sun H. New insights into butyrylcholinesterase: Pharmaceutical applications, selective inhibitors and multitarget-directed ligands. Eur J Med Chem 2024; 275:116569. [PMID: 38852337 DOI: 10.1016/j.ejmech.2024.116569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/30/2024] [Accepted: 06/02/2024] [Indexed: 06/11/2024]
Abstract
Butyrylcholinesterase (BChE), also known as pseudocholinesterase and serum cholinesterase, is an isoenzyme of acetylcholinesterase (AChE). It mediates the degradation of acetylcholine, especially under pathological conditions. Proverbial pharmacological applications of BChE, its mutants and modulators consist of combating Alzheimer's disease (AD), influencing multiple sclerosis (MS), addressing cocaine addiction, detoxifying organophosphorus poisoning and reflecting the progression or prognosis of some diseases. Of interest, recent reports have shed light on the relationship between BChE and lipid metabolism. It has also been proved that BChE is going to increase abnormally as a compensator for AChE in the middle and late stages of AD, and BChE inhibitors can alleviate cognitive disorders and positively influence some pathological features in AD model animals, foreboding favorable prospects and potential applications. Herein, the selective BChE inhibitors and BChE-related multitarget-directed ligands published in the last three years were briefly summarized, along with the currently known pharmacological applications of BChE, aiming to grasp the latest research directions. Thereinto, some emerging strategies for designing BChE inhibitors are intriguing, and the modulators based on target combination of histone deacetylase and BChE against AD is unprecedented. Furthermore, the involvement of BChE in the hydrolysis of ghrelin, the inhibition of low-density lipoprotein (LDL) uptake, and the down-regulation of LDL receptor (LDLR) expression suggests its potential to influence lipid metabolism disorders. This compelling prospect likely stimulates further exploration in this promising research direction.
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Affiliation(s)
- Tianyu Sun
- School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, People's Republic of China
| | - Tengfei Zhen
- School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, People's Republic of China
| | | | - Lei Wang
- School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, People's Republic of China
| | - Huanchao Guo
- School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, People's Republic of China
| | - Yao Chen
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, People's Republic of China.
| | - Haopeng Sun
- School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, People's Republic of China.
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2
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Wei H, LeSaint JE, Jin Z, Zhan CG, Zheng F. Long-lasting blocking of interoceptive effects of cocaine by a highly efficient cocaine hydrolase in rats. Sci Rep 2024; 14:927. [PMID: 38195724 PMCID: PMC10776848 DOI: 10.1038/s41598-023-50678-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 12/22/2023] [Indexed: 01/11/2024] Open
Abstract
Cocaine dependence is a serious world-wide public health problem without an FDA-approved pharmacotherapy. We recently designed and discovered a highly efficient long-acting cocaine hydrolase CocH5-Fc(M6). The present study examined the effectiveness and duration of CocH5-Fc(M6) in blocking interoceptive effects of cocaine by performing cocaine discrimination tests in rats, demonstrating that the duration of CocH5-Fc(M6) in blocking cocaine discrimination was dependent on cocaine dose and CocH5-Fc(M6) plasma concentration. Particularly, a dose of 3 mg/kg CocH5-Fc(M6) effectively attenuated discriminative stimulus effects of 10 mg/kg cocaine, cumulative doses of 10 and 32 mg/kg cocaine, and cumulative doses of 10, 32 and 56 mg/kg cocaine by ≥ 20% for 41, 19, and 10 days, and completely blocked the discriminative stimulus effects for 30, 13, and 5 days with corresponding threshold plasma CocH5-Fc(M6) concentrations of 15.9, 72.2, and 221 nM, respectively, under which blood cocaine concentration was negligible. Additionally, based on the data obtained, cocaine discrimination model is more sensitive than the locomotor activity to reveal cocaine effects and that CocH5-Fc(M6) itself has no long-term toxicity regarding behavioral activities such as lever pressing and food consumption in rats, further demonstrating that CocH5-Fc(M6) has the desired properties as a promising therapeutic candidate for prevenance of cocaine dependence.
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Affiliation(s)
- Huimei Wei
- Molecular Modeling and Biopharmaceutical Center, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA
| | - Johnathan E LeSaint
- Molecular Modeling and Biopharmaceutical Center, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA
| | - Zhenyu Jin
- Molecular Modeling and Biopharmaceutical Center, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA
| | - Chang-Guo Zhan
- Molecular Modeling and Biopharmaceutical Center, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA.
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA.
| | - Fang Zheng
- Molecular Modeling and Biopharmaceutical Center, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA.
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA.
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3
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Mukherjee RP, Yow GY, Sarakbi S, Menegatti S, Gurgel PV, Carbonell RG, Bobay BG. Integrated in silico and experimental discovery of trimeric peptide ligands targeting Butyrylcholinesterase. Comput Biol Chem 2023; 102:107797. [PMID: 36463785 DOI: 10.1016/j.compbiolchem.2022.107797] [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: 08/11/2022] [Revised: 11/09/2022] [Accepted: 11/25/2022] [Indexed: 12/02/2022]
Abstract
Butyrylcholinesterase (BChE) is recognized as a high value biotherapeutic in the treatment of Alzheimer's disease and drug addiction. This study presents the rational design and screening of an in-silico library of trimeric peptides against BChE and the experimental characterization of peptide ligands for purification. The selected peptides consistently afforded high BChE recovery (> 90 %) and purity, yielding up to a 1000-fold purification factor. This study revealed a marked anti-correlated conformational movement governed by the ionic strength and pH of the aqueous environment, which ultimately controls BChE binding and release during chromatographic purification; and highlighted the role of residues within and allosteric to the catalytic triad of BChE in determining biorecognition, thus providing useful guidance for ligand design and affinity maturation.
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Affiliation(s)
- Rudra Palash Mukherjee
- Biomanufacturing Training and Education Center (BTEC), North Carolina State University, Raleigh, NC 27606, USA; Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27606, USA
| | | | | | - Stefano Menegatti
- Biomanufacturing Training and Education Center (BTEC), North Carolina State University, Raleigh, NC 27606, USA; Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27606, USA
| | - Patrick V Gurgel
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27606, USA; Prometic Bioseparations Ltd, Cambridge CB23 7AJ, UK
| | - Ruben G Carbonell
- Biomanufacturing Training and Education Center (BTEC), North Carolina State University, Raleigh, NC 27606, USA; Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27606, USA; William R. Kenan, Jr. Institute for Engineering, Technology and Science North Carolina State University, Raleigh, NC 27606, USA.
| | - Benjamin G Bobay
- Duke University NMR Center, Duke University Medical Center, Durham, NC 27710, USA; Department of Biochemistry, Duke University, Durham, NC 27710, USA; Department of Radiology, Duke University, Durham, NC 27710, USA.
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4
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Decker SO, Krüger A, Wilk H, Uhle F, Bruckner T, Hofer S, Weigand MA, Brenner T, Zivkovic AR. Concurrent Change in Serum Cholinesterase Activity and Midregional-Proadrennomedullin Level Could Predict Patient Outcome following Liver Transplantation. Biomolecules 2022; 12:biom12070989. [PMID: 35883545 PMCID: PMC9312899 DOI: 10.3390/biom12070989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 06/17/2022] [Accepted: 07/12/2022] [Indexed: 02/01/2023] Open
Abstract
Background: After liver transplantation (LTX), patients are susceptible to opportunistic infections resulting in reduced outcomes within the early post-transplantation period. The postoperative monitoring of LTX patients has gained much importance in recent years. However, reliable plasmatic markers predicting 90-day outcomes are still lacking. Methods: In the post hoc analysis of a prospective, observational study, butyrylcholinesterase (BChE), mid-regional proadrenomedullin (MR-proADM), as well as conventional inflammatory markers (procalcitonin, C-reactive protein) were evaluated in 93 patients at seven consecutive timepoints within the first 28 days following LTX. Results: Persistently reduced activity of BChE and elevated MR-proADM levels indicated reduced 90-day survival following LTX. Furthermore, reduced BChE and increased MR-proADM activity could indicate early post-transplantation bacterial infections, whereas conventional inflammatory biomarkers showed no diagnostic efficacy within the observation period. Conclusion: Concurrent assessment of BChE and MR-proADM activity might serve as a bedside diagnostic tool for early bacterial infections following liver transplantation. Thus, a combined utilization of the two biomarkers may be a useful tool in the risk evaluation of patients following liver transplantation.
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Affiliation(s)
- Sebastian O. Decker
- Department of Anesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120 Heidelberg, Germany; (A.K.); (H.W.); (F.U.); (M.A.W.); (T.B.)
- Correspondence: (S.O.D.); (A.R.Z.); Tel.: +49-(0)62-215636380 (S.O.D.); +49-(0)62-215636843 (A.R.Z.); Fax: +49-(0)62-21565345 (S.O.D. & A.R.Z.)
| | - Albert Krüger
- Department of Anesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120 Heidelberg, Germany; (A.K.); (H.W.); (F.U.); (M.A.W.); (T.B.)
| | - Henryk Wilk
- Department of Anesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120 Heidelberg, Germany; (A.K.); (H.W.); (F.U.); (M.A.W.); (T.B.)
| | - Florian Uhle
- Department of Anesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120 Heidelberg, Germany; (A.K.); (H.W.); (F.U.); (M.A.W.); (T.B.)
| | - Thomas Bruckner
- Institute of Medical Biometry and Informatics, Heidelberg University, Im Neuenheimer Feld 130, 69120 Heidelberg, Germany;
| | - Stefan Hofer
- Department of Anesthesiology, Westpfalzklinikum, Kaiserslautern, Hellmut-Hartert-Straße 1, 67655 Kaiserslautern, Germany;
| | - Markus A. Weigand
- Department of Anesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120 Heidelberg, Germany; (A.K.); (H.W.); (F.U.); (M.A.W.); (T.B.)
| | - Thorsten Brenner
- Department of Anesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120 Heidelberg, Germany; (A.K.); (H.W.); (F.U.); (M.A.W.); (T.B.)
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Aleksandar R. Zivkovic
- Department of Anesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120 Heidelberg, Germany; (A.K.); (H.W.); (F.U.); (M.A.W.); (T.B.)
- Correspondence: (S.O.D.); (A.R.Z.); Tel.: +49-(0)62-215636380 (S.O.D.); +49-(0)62-215636843 (A.R.Z.); Fax: +49-(0)62-21565345 (S.O.D. & A.R.Z.)
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5
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Allard JL, Shields KA, Munro T, Lua LHL. Design and production strategies for developing a recombinant butyrylcholinesterase medical countermeasure for Organophosphorus poisoning. Chem Biol Interact 2022; 363:109996. [PMID: 35654125 DOI: 10.1016/j.cbi.2022.109996] [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: 02/17/2022] [Revised: 05/06/2022] [Accepted: 05/24/2022] [Indexed: 11/25/2022]
Abstract
Organophosphorus nerve agents represent a serious chemical threat due to their ease of production and scale of impact. The recent use of the nerve agent Novichok has re-emphasised the need for broad-spectrum medical countermeasures (MCMs) to these agents. However, current MCMs are limited. Plasma derived human butyrylcholinesterase (huBChE) is a promising novel bioscavenger MCM strategy, but is prohibitively expensive to isolate from human plasma at scale. Efforts to produce recombinant huBChE (rBChE) in various protein expression platforms have failed to achieve key critical attributes of huBChE such as circulatory half-life. These proteins often lack critical features such as tetrameric structure and requisite post-translational modifications. This review evaluates previous attempts to generate rBChE and assesses recent advances in mammalian cell expression and protein engineering strategies that could be deployed to achieve the required half-life and yield for a viable rBChE MCM. This includes the addition of a proline-rich attachment domain, fusion proteins, post translational modifications, expression system selection and optimised downstream processes. Whilst challenges remain, a combinatorial approach of these strategies demonstrates potential as a technically feasible approach to achieving a bioactive and cost effective bioscavenger MCM.
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Affiliation(s)
- Joanne L Allard
- Defence Science and Technology Group, Fishermans Bend, Victoria, 3207, Australia; The University of Queensland, Brisbane, Queensland, 4072, Australia.
| | - Katherine A Shields
- Defence Science and Technology Group, Fishermans Bend, Victoria, 3207, Australia
| | - TrentP Munro
- The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Linda H L Lua
- The University of Queensland, Brisbane, Queensland, 4072, Australia
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6
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De Boer D, Nguyen N, Mao J, Moore J, Sorin EJ. A Comprehensive Review of Cholinesterase Modeling and Simulation. Biomolecules 2021; 11:580. [PMID: 33920972 PMCID: PMC8071298 DOI: 10.3390/biom11040580] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 04/08/2021] [Accepted: 04/11/2021] [Indexed: 01/18/2023] Open
Abstract
The present article reviews published efforts to study acetylcholinesterase and butyrylcholinesterase structure and function using computer-based modeling and simulation techniques. Structures and models of both enzymes from various organisms, including rays, mice, and humans, are discussed to highlight key structural similarities in the active site gorges of the two enzymes, such as flexibility, binding site location, and function, as well as differences, such as gorge volume and binding site residue composition. Catalytic studies are also described, with an emphasis on the mechanism of acetylcholine hydrolysis by each enzyme and novel mutants that increase catalytic efficiency. The inhibitory activities of myriad compounds have been computationally assessed, primarily through Monte Carlo-based docking calculations and molecular dynamics simulations. Pharmaceutical compounds examined herein include FDA-approved therapeutics and their derivatives, as well as several other prescription drug derivatives. Cholinesterase interactions with both narcotics and organophosphate compounds are discussed, with the latter focusing primarily on molecular recognition studies of potential therapeutic value and on improving our understanding of the reactivation of cholinesterases that are bound to toxins. This review also explores the inhibitory properties of several other organic and biological moieties, as well as advancements in virtual screening methodologies with respect to these enzymes.
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Affiliation(s)
- Danna De Boer
- Department of Chemistry & Biochemistry, California State University, Long Beach, CA 90840, USA;
| | - Nguyet Nguyen
- Department of Chemical Engineering, California State University, Long Beach, CA 90840, USA; (N.N.); (J.M.)
| | - Jia Mao
- Department of Chemical Engineering, California State University, Long Beach, CA 90840, USA; (N.N.); (J.M.)
| | - Jessica Moore
- Department of Biomedical Engineering, California State University, Long Beach, CA 90840, USA;
| | - Eric J. Sorin
- Department of Chemistry & Biochemistry, California State University, Long Beach, CA 90840, USA;
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7
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Zhao S, Xu J, Zhang S, Han M, Wu Y, Li Y, Hu L. Multivalent butyrylcholinesterase inhibitor discovered by exploiting dynamic combinatorial chemistry. Bioorg Chem 2021; 108:104656. [PMID: 33548731 DOI: 10.1016/j.bioorg.2021.104656] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 01/07/2021] [Accepted: 01/12/2021] [Indexed: 12/21/2022]
Abstract
In this study, we report the generation of a polymer-based dynamic combinatorial library (DCL) incorporating exchangeable side chains using acylhydrazone formation reaction. In combination with tetrameric butyrylcholinesterase (BChE), the most potent binding side chain was identified, and the information obtained was further used for the synthesis of a multivalent BChE inhibitor. In the in vitro biological evaluation, this multivalent inhibitor exhibited not only better inhibitory effect than the commercial reference but also high selectivity on BChE over acetylcholinesterase (AChE).
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Affiliation(s)
- Shuang Zhao
- School of Pharmacy, Jiangsu University, 301 Xuefu Rd., Zhenjiang, China
| | - Jintao Xu
- School of Pharmacy, Jiangsu University, 301 Xuefu Rd., Zhenjiang, China
| | - Shixin Zhang
- School of Pharmacy, Jiangsu University, 301 Xuefu Rd., Zhenjiang, China
| | - Maochun Han
- School of Pharmacy, Jiangsu University, 301 Xuefu Rd., Zhenjiang, China
| | - Yao Wu
- School of Pharmacy, Jiangsu University, 301 Xuefu Rd., Zhenjiang, China
| | - Yusi Li
- School of Pharmacy, Jiangsu University, 301 Xuefu Rd., Zhenjiang, China
| | - Lei Hu
- School of Pharmacy, Jiangsu University, 301 Xuefu Rd., Zhenjiang, China.
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8
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Macharoen K, Du M, Jung S, McDonald KA, Nandi S. Production of recombinant butyrylcholinesterase from transgenic rice cell suspension cultures in a pilot-scale bioreactor. Biotechnol Bioeng 2020; 118:1431-1443. [PMID: 33241854 DOI: 10.1002/bit.27638] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 11/12/2020] [Accepted: 11/17/2020] [Indexed: 12/17/2022]
Abstract
Producing recombinant proteins in transgenic plant cell suspension cultures in bioreactors provides controllability, reproducibility, scalability, and low-cost production, although low yields remain the major challenge. The studies on scaling-up to pilot-scale bioreactors, especially in conventional stainless-steel stirred tank bioreactors (STB), to produce recombinant proteins in plant cell suspension cultures are very limited. In this study, we scaled-up the production of rice recombinant butyrylcholinesterase (rrBChE), a complex hydrolase enzyme that can be used to prophylactically and therapeutically treat against organophosphorus nerve agents and pesticide exposure, from metabolically regulated transgenic rice cell suspension cultures in a 40-L pilot-scale STB. Employing cyclical operation together with a simplified-process operation (controlling gas sparging rate rather than dissolved oxygen and allowing natural sugar depletion) identified in lab-scale (5 L) bioreactor studies, we found a consistent maximum total active rrBChE production level of 46-58 µg/g fresh weight in four cycles over 82 days of semicontinuous operation. Additionally, maintaining the overall volumetric oxygen mass transfer coefficient (kL a) in the pilot-scale STB to be equivalent to the lab-scale STB improves the maximum total active rrBChE production level and the maximum volumetric productivity to 85 µg/g fresh weight and 387 µg L-1 day-1 , respectively, which are comparable to the lab-scale culture. Here, we demonstrate pilot-scale bioreactor performance using a metabolically regulated transgenic rice cell culture for long-term, reproducible, and sustained production of rrBChE.
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Affiliation(s)
| | - Min Du
- Department of Chemical Engineering, University of California, Davis, California, USA
| | - Seongwon Jung
- Department of Chemical Engineering, University of California, Davis, California, USA
| | - Karen A McDonald
- Department of Chemical Engineering, University of California, Davis, California, USA.,Global HealthShare® Initiative, University of California, Davis, California, USA
| | - Somen Nandi
- Department of Chemical Engineering, University of California, Davis, California, USA.,Global HealthShare® Initiative, University of California, Davis, California, USA
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9
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Leung MR, Zeev-Ben-Mordehai T. Cryo-electron microscopy of cholinesterases, present and future. J Neurochem 2020; 158:1236-1243. [PMID: 33222205 PMCID: PMC8518539 DOI: 10.1111/jnc.15245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 10/30/2020] [Accepted: 11/11/2020] [Indexed: 02/06/2023]
Abstract
Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) exist in a variety of oligomeric forms, each with defined cellular and subcellular distributions. Although crystal structures of AChE and BChE have been available for many years, structures of the physiologically relevant ChE tetramer were only recently solved by cryo‐electron microscopy (cryo‐EM) single‐particle analysis. Here, we briefly review how these structures contribute to our understanding of cholinesterase oligomerization, highlighting the advantages of using cryo‐EM to resolve structures of protein assemblies that cannot be expressed recombinantly. We argue that the next frontier in cholinesterase structural biology is to image membrane‐anchored ChE oligomers directly in their native environment—the cell.
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Affiliation(s)
- Miguel Ricardo Leung
- Cryo-Electron Microscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands.,The Division of Structural Biology, Wellcome Centre for Human Genetics, The University of Oxford, Oxford, UK
| | - Tzviya Zeev-Ben-Mordehai
- Cryo-Electron Microscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands.,The Division of Structural Biology, Wellcome Centre for Human Genetics, The University of Oxford, Oxford, UK
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10
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Xing S, Li Q, Xiong B, Chen Y, Feng F, Liu W, Sun H. Structure and therapeutic uses of butyrylcholinesterase: Application in detoxification, Alzheimer's disease, and fat metabolism. Med Res Rev 2020; 41:858-901. [PMID: 33103262 DOI: 10.1002/med.21745] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/21/2020] [Accepted: 10/12/2020] [Indexed: 02/06/2023]
Abstract
Structural information of butyrylcholinesterase (BChE) and its variants associated with several diseases are discussed here. Pure human BChE has been proved safe and effective in treating organophosphorus (OPs) poisoning and has completed Phase 1 and 2 pharmacokinetic (PK) and safety studies. The introduction of specific mutations into native BChE to endow it a self-reactivating property has gained much progress in producing effective OPs hydrolases. The hydrolysis ability of native BChE on cocaine has been confirmed but was blocked to clinical application due to poor PK properties. Several BChE mutants with elevated cocaine hydrolysis activity were published, some of which have shown safety and efficiency in treating cocaine addiction of human. The increased level of BChE in progressed Alzheimer's disease patients made it a promising target to elevate acetylcholine level and attenuate cognitive status. A variety of selective BChE inhibitors with high inhibitory activity published in recent years are reviewed here. BChE could influence the weight and insulin secretion and resistance of BChE knockout (KO) mice through hydrolyzing ghrelin. The BChE-ghrelin pathway could also regulate aggressive behaviors of BChE-KO mice.
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Affiliation(s)
- Shuaishuai Xing
- School of Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Qi Li
- School of Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Baichen Xiong
- School of Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Yao Chen
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Feng Feng
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China.,Institute of Food and Pharmaceuticals Research, Jiangsu Food and Pharmaceuticals Science College, Nanjing, China
| | - Wenyuan Liu
- School of Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Haopeng Sun
- School of Pharmacy, China Pharmaceutical University, Nanjing, China
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11
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Zhang L, Baker SL, Murata H, Harris N, Ji W, Amitai G, Matyjaszewski K, Russell AJ. Tuning Butyrylcholinesterase Inactivation and Reactivation by Polymer-Based Protein Engineering. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1901904. [PMID: 31921563 PMCID: PMC6947490 DOI: 10.1002/advs.201901904] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 09/21/2019] [Indexed: 05/11/2023]
Abstract
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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Affiliation(s)
- Libin Zhang
- Center for Polymer‐Based Protein EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
| | - Stefanie L. Baker
- Center for Polymer‐Based Protein EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
- Department of Biomedical EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
| | - Hironobu Murata
- Center for Polymer‐Based Protein EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
| | - Nicholas Harris
- Center for Polymer‐Based Protein EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
- Department of Biotechnology EngineeringORT Braude Academic CollegeKarmielPOB78Israel
| | - Weihang Ji
- Center for Polymer‐Based Protein EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
| | - Gabriel Amitai
- Wohl Drug Discovery InstituteNancy and Stephen Grand Israel National Center for Personalized Medicine (G‐INCPM)Weizmann Institute of ScienceRehovot760001Israel
| | - Krzysztof Matyjaszewski
- Center for Polymer‐Based Protein EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
- Department of ChemistryDepartment of Chemical EngineeringCarnegie Mellon University4400 Fifth AvenuePittsburghPA15213USA
| | - Alan J. Russell
- Center for Polymer‐Based Protein EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
- Department of Biomedical EngineeringCarnegie Mellon University5000 Forbes AvenuePittsburghPA15213USA
- Department of ChemistryDepartment of Chemical EngineeringCarnegie Mellon University4400 Fifth AvenuePittsburghPA15213USA
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12
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Braid LR, Wood CA, Ford BN. Human umbilical cord perivascular cells: A novel source of the organophosphate antidote butyrylcholinesterase. Chem Biol Interact 2019; 305:66-78. [PMID: 30926319 DOI: 10.1016/j.cbi.2019.03.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 03/20/2019] [Accepted: 03/25/2019] [Indexed: 01/06/2023]
Abstract
Human butyrylcholinesterase (BChE) is a well-characterized bioscavenger with significant potential as a prophylactic or post-exposure treatment for organophosphate poisoning. Despite substantial efforts, BChE has proven technically challenging to produce in recombinant systems. Recombinant BChE tends to be insufficiently or incorrectly glycosylated, and consequently exhibits a truncated half-life, compromised activity, or is immunogenic. Thus, expired human plasma remains the only reliable source of the benchmark BChE tetramer, but production is costly and time intensive and presents possible blood-borne disease hazards. Here we report a human BChE production platform that produces functionally active, tetrameric BChE enzyme, without the addition of external factors such as polyproline peptides or chemical or gene modification required by other systems. Human umbilical cord perivascular cells (HUCPVCs) are a rich population of mesenchymal stromal cells (MSCs) derived from Wharton's jelly. We show that HUCPVCs naturally and stably secrete BChE during culture in xeno- and serum-free media, and can be gene-modified to increase BChE output. However, BChE secretion from HUCPVCs is limited by innate feedback mechanisms that can be interrupted by addition of miR 186 oligonucleotide mimics or by competitive inhibition of muscarinic cholinergic signalling receptors by addition of atropine. By contrast, adult bone marrow-derived mesenchymal stromal cells neither secrete measurable levels of BChE naturally, nor after gene modification. Further work is required to fully characterize and disable the intrinsic ceiling of HUCPVC-mediated BChE secretion to achieve commercially relevant enzyme output. However, HUCPVCs present a unique opportunity to produce both native and strategically engineered recombinant BChE enzyme in a human platform with the innate capacity to secrete the benchmark human plasma form.
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Affiliation(s)
- Lorena R Braid
- Aurora BioSolutions Inc., PO Box 21053, Crescent Heights PO, Medicine Hat, AB, T1A 6N0, Canada.
| | - Catherine A Wood
- Aurora BioSolutions Inc., PO Box 21053, Crescent Heights PO, Medicine Hat, AB, T1A 6N0, Canada
| | - Barry N Ford
- DRDC Suffield Research Centre, Casualty Management Section, Box 4000 Station Main, Medicine Hat, AB, T1A 8K6, Canada
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13
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Boyko KM, Baymukhametov TN, Chesnokov YM, Hons M, Lushchekina SV, Konarev PV, Lipkin AV, Vasiliev AL, Masson P, Popov VO, Kovalchuk MV. 3D structure of the natural tetrameric form of human butyrylcholinesterase as revealed by cryoEM, SAXS and MD. Biochimie 2019; 156:196-205. [DOI: 10.1016/j.biochi.2018.10.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 10/24/2018] [Indexed: 12/13/2022]
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Cryo-EM structure of the native butyrylcholinesterase tetramer reveals a dimer of dimers stabilized by a superhelical assembly. Proc Natl Acad Sci U S A 2018; 115:13270-13275. [PMID: 30538207 DOI: 10.1073/pnas.1817009115] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The quaternary structures of the cholinesterases, acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), are essential for their localization and function. Of practical importance, BChE is a promising therapeutic candidate for intoxication by organophosphate nerve agents and insecticides, and for detoxification of addictive substances. Efficacy of the recombinant enzyme hinges on its having a long circulatory half-life; this, in turn, depends strongly on its ability to tetramerize. Here, we used cryoelectron microscopy (cryo-EM) to determine the structure of the highly glycosylated native BChE tetramer purified from human plasma at 5.7 Å. Our structure reveals that the BChE tetramer is organized as a staggered dimer of dimers. Tetramerization is mediated by assembly of the C-terminal tryptophan amphiphilic tetramerization (WAT) helices from each subunit as a superhelical assembly around a central lamellipodin-derived oligopeptide with a proline-rich attachment domain (PRAD) sequence that adopts a polyproline II helical conformation and runs antiparallel. The catalytic domains within a dimer are asymmetrically linked to the WAT/PRAD. In the resulting arrangement, the tetramerization domain is largely shielded by the catalytic domains, which may contribute to the stability of the human BChE (HuBChE) tetramer. Our cryo-EM structure reveals the basis for assembly of the native tetramers and has implications for the therapeutic applications of HuBChE. This mode of tetramerization is seen only in the cholinesterases but may provide a promising template for designing other proteins with improved circulatory residence times.
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Structural stability of human butyrylcholinesterase under high hydrostatic pressure. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1867:107-113. [PMID: 30414450 DOI: 10.1016/j.bbapap.2018.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 11/02/2018] [Accepted: 11/05/2018] [Indexed: 11/23/2022]
Abstract
Human butyrylcholinesterase is a nonspecific enzyme of clinical, pharmacological and toxicological significance. Although the enzyme is relatively stable, its activity is affected by numerous factors, including pressure. In this work, hydrostatic pressure dependence of the intrinsic tryptophan fluorescence in native and salted human butyrylcholinesterase was studied up to the maximum pressure at ambient temperature of about 1200 MPa. A correlated large shift toward long wavelengths and broadening observed at pressures between 200 and 700 MPa was interpreted as due to high pressure-induced denaturation of the protein, leading to an enhanced exposure of tryptophan residues into polar solvent environment. This transient process in native butyrylcholinesterase presumably involves conformational changes of the enzyme at both tertiary and secondary structure levels. Pressure-induced mixing of emitting local indole electronic transitions with quenching charge transfer states likely describes the accompanying fluorescence quenching that reveals different course from spectral changes. All the pressure-induced changes turned irreversible after passing a mid-point pressure of about 400 ± 50 MPa. Addition of either 0.1 M ammonium sulphate (a kosmotropic salt) or 0.1 M lithium thiocyanate (a chaotropic salt) to native enzyme similarly destabilized its structure.
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16
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Zhao Y, Yang M, Fu Q, Ouyang H, Wen W, Song Y, Zhu C, Lin Y, Du D. A Nanozyme- and Ambient Light-Based Smartphone Platform for Simultaneous Detection of Dual Biomarkers from Exposure to Organophosphorus Pesticides. Anal Chem 2018; 90:7391-7398. [DOI: 10.1021/acs.analchem.8b00837] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Yuting Zhao
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People’s Republic of China
| | - Mingming Yang
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Qiangqiang Fu
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Hui Ouyang
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Wei Wen
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Yang Song
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Chengzhou Zhu
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Yuehe Lin
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Dan Du
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
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17
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Yang M, Zhao Y, Wang L, Paulsen M, Simpson CD, Liu F, Du D, Lin Y. Simultaneous detection of dual biomarkers from humans exposed to organophosphorus pesticides by combination of immunochromatographic test strip and ellman assay. Biosens Bioelectron 2017; 104:39-44. [PMID: 29306031 DOI: 10.1016/j.bios.2017.12.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 12/14/2017] [Accepted: 12/19/2017] [Indexed: 02/04/2023]
Abstract
A novel sandwich immunoassay based immunochromatographic test strip (ICTS) has been developed for simultaneously measuring both butyrylcholinesterase (BChE) activity and the total amount of BChE (including inhibited and active enzyme) from 70 μLpost-exposure human plasma sample. The principle of this method is based on the BChE monoclonal antibody (MAb) capable of acting as both capture antibody and detection antibody. The BChE MAb which was immobilized on the test line was able to recognize both organophosphorus BChE adducts (OP-BChE) and BChE and provided equal binding affinity, permitting detection of the total enzyme amount in post-exposure human plasma samples. The formed immunocomplexes on the test line can further be excised from the test-strip for subsequent off-line measurement of BChE activity using the Ellman assay. Therefore, dual biomarkers of BChE activity and phosphorylation (OP-BChE) will be obtained simultaneously. The whole sandwich-immunoassay was performed on one ICTS, greatly reducing analytical time. The ICTS sensor showed excellent linear responses for assaying total amount of BChE and active BChE ranging from 0.22 to 3.58nM and 0.22-7.17nM, respectively. Both the signal detection limits are 0.10nM. We validated the practical application of the proposed method to measure 124 human plasma samples from orchard workers and cotton farmers with long-term exposure to organophosphorus pesticides (OPs). The results were in highly agreement with LC/MS/MS which verified our method is extremely accurate. Combining the portability and rapidity of test strip and the compatibility of BChE MAb as both capture antibody and detection antibody, the developed method provides a baseline-free, low-cost and rapid tool for in-field monitoring of OP exposures.
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Affiliation(s)
- Mingming Yang
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, United States; Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Yuting Zhao
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, United States
| | - Limin Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | - Michael Paulsen
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, United States
| | - Christopher D Simpson
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, United States
| | - Fengquan Liu
- Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Dan Du
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, United States.
| | - Yuehe Lin
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, United States.
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18
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Bernardi A, Kirschner KN, Faller R. Structural analysis of human glycoprotein butyrylcholinesterase using atomistic molecular dynamics: The importance of glycosylation site ASN241. PLoS One 2017; 12:e0187994. [PMID: 29190644 PMCID: PMC5708630 DOI: 10.1371/journal.pone.0187994] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/30/2017] [Indexed: 11/18/2022] Open
Abstract
Human butyrylcholinesterase (BChE) is a glycoprotein capable of bioscavenging toxic compounds such as organophosphorus (OP) nerve agents. For commercial production of BChE, it is practical to synthesize BChE in non–human expression systems, such as plants or animals. However, the glycosylation profile in these systems is significantly different from the human glycosylation profile, which could result in changes in BChE’s structure and function. From our investigation, we found that the glycan attached to ASN241 is both structurally and functionally important due to its close proximity to the BChE tetramerization domain and the active site gorge. To investigate the effects of populating glycosylation site ASN241, monomeric human BChE glycoforms were simulated with and without site ASN241 glycosylated. Our simulations indicate that the structure and function of human BChE are significantly affected by the absence of glycan 241.
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Affiliation(s)
- Austen Bernardi
- Department of Chemical Engineering, University of California–Davis, Davis, California, United States of America
| | - Karl N. Kirschner
- Bonn–Rhein–Sieg University of Applied Sciences, Sankt Augustin, Germany
| | - Roland Faller
- Department of Chemical Engineering, University of California–Davis, Davis, California, United States of America
- * E-mail:
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Wang Q, Chen CH, Chung CY, Priola J, Chu JH, Tang J, Ulmschneider MB, Betenbaugh MJ. Proline-Rich Chaperones Are Compared Computationally and Experimentally for Their Abilities to Facilitate Recombinant Butyrylcholinesterase Tetramerization in CHO Cells. Biotechnol J 2017; 13:e1700479. [DOI: 10.1002/biot.201700479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 09/26/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Qiong Wang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University; 221 Maryland Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
| | - Charles H. Chen
- Department of Materials Science and Engineering, Johns Hopkins University; 204C Shaffer Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
- Department of Chemistry, King's College London; Britannia House, 7 Trinity Street London SE1 1DB UK
| | - Cheng-yu Chung
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University; 221 Maryland Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
| | - Joseph Priola
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University; 221 Maryland Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
| | - Jeffrey H. Chu
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University; 221 Maryland Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
| | - Juechun Tang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University; 221 Maryland Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
| | - Martin B. Ulmschneider
- Department of Materials Science and Engineering, Johns Hopkins University; 204C Shaffer Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
- Department of Chemistry, King's College London; Britannia House, 7 Trinity Street London SE1 1DB UK
| | - Michael J. Betenbaugh
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University; 221 Maryland Hall, 3400 N. Charles St. Baltimore Maryland 21218 USA
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20
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The C5 Variant of the Butyrylcholinesterase Tetramer Includes a Noncovalently Bound 60 kDa Lamellipodin Fragment. Molecules 2017; 22:molecules22071083. [PMID: 28661448 PMCID: PMC6152381 DOI: 10.3390/molecules22071083] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Revised: 06/27/2017] [Accepted: 06/27/2017] [Indexed: 11/17/2022] Open
Abstract
Humans with the C5 genetic variant of butyrylcholinesterase (BChE) have 30–200% higher plasma BChE activity, low body weight, and shorter duration of action of the muscle relaxant succinylcholine. The C5 variant has an extra, slow-moving band of BChE activity on native polyacrylamide gel electrophoresis. This band is about 60 kDa larger than wild-type BChE. Umbilical cord BChE in 100% of newborn babies has a C5-like band. Our goal was to identify the unknown, 60 kDa protein in C5. Both wild-type and C5 BChE are under the genetic control of two independent loci, the BCHE gene on Chr 3q26.1 and the RAPH1 (lamellipodin) gene on Chr 2q33. Wild-type BChE tetramers are assembled around a 3 kDa polyproline peptide from lamellipodin. Western blot of boiled C5 and cord BChE showed a positive response with an antibody to the C-terminus of lamellipodin. The C-terminal exon of lamellipodin is about 60 kDa including an N-terminal polyproline. We propose that the unknown protein in C5 and cord BChE is encoded by the last exon of the RAPH1 gene. In 90% of the population, the 60 kDa fragment is shortened to 3 kDa during maturation to adulthood, leaving only 10% of adults with C5 BChE.
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21
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dos Santos W, Tureck LV, Saliba LF, Schenknecht CS, Scaraboto D, Souza RLR, Furtado-Alle L. Effects of energetic restriction diet on butyrylcholinesterase in obese women from southern Brazil - A longitudinal study. ARCHIVES OF ENDOCRINOLOGY AND METABOLISM 2017; 61:484-489. [PMID: 28658346 PMCID: PMC10522251 DOI: 10.1590/2359-3997000000268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 01/13/2017] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Butyrylcholinesterase (BChE) activity has been associated with obesity, lipid concentrations, and CHE2 locus phenotypes. This, the aim of this study was to evaluate the effects of an energetic restriction diet intervention on anthropometrical and biochemical variables and on absolute and relative BChE activity in CHE2 C5+ and CHE2 C5- individuals. SUBJECTS AND METHODS One hundred eleven premenopausal obese women from Southern Brazil participated in an energetic restriction diet intervention (deficit of 2500 kJ/day) for 8 weeks. Their anthropometric and biochemical parameters were evaluated before and after the intervention. Plasma BChE activity was measured, and BChE bands in plasma and CHE2 locus phenotypes were detected by electrophoresis. RESULTS The dietetic intervention decreased anthropometric and biochemical parameters as well as absolute BChE activity and relative activity of the G4 band. The CHE2 C5+ phenotype presented a different effect when compared with the CHE2 C5- phenotype. The CHE2 C5+ phenotype showed an effect in absolute BChE activity and in the relative activity of the G4 form, maintaining higher BChE activity regardless of the metabolic changes. CONCLUSION In our study, 8 weeks was not sufficient time to lower the body mass index to normal, but it was enough to significantly reduce the absolute BChE activity, which became similar to the levels in nonobese individuals. CHE2 C5+ individuals were resistant to the decrease in BChE activity compared to CHE2 C5- individuals. This shows that the diet did not affect the CHE2 and G4 fraction complex and that the products of the CHE2 locus in association with BChE have a role in energy metabolism, maintaining high levels of enzymatic activity even after dietary intervention.
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Affiliation(s)
- Willian dos Santos
- Laboratório de Polimorfismos e LigaçãoDepartamento de GenéticaUniversidade Federal do ParanáCuritibaPRBrasilLaboratório de Polimorfismos e Ligação, Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brasil
| | - Luciane Viater Tureck
- Laboratório de Polimorfismos e LigaçãoDepartamento de GenéticaUniversidade Federal do ParanáCuritibaPRBrasilLaboratório de Polimorfismos e Ligação, Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brasil
- Departamento de EducaçãoUniversidade Tecnológica Federal do ParanáCuritibaPRBrasilDepartamento de Educação, Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, PR, Brasil
| | - Louise Farah Saliba
- Laboratório de Polimorfismos e LigaçãoDepartamento de GenéticaUniversidade Federal do ParanáCuritibaPRBrasilLaboratório de Polimorfismos e Ligação, Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brasil
| | - Caroline Schovanz Schenknecht
- Laboratório de Polimorfismos e LigaçãoDepartamento de GenéticaUniversidade Federal do ParanáCuritibaPRBrasilLaboratório de Polimorfismos e Ligação, Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brasil
| | - Débora Scaraboto
- Laboratório de Polimorfismos e LigaçãoDepartamento de GenéticaUniversidade Federal do ParanáCuritibaPRBrasilLaboratório de Polimorfismos e Ligação, Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brasil
| | - Ricardo Lehtonen R. Souza
- Laboratório de Polimorfismos e LigaçãoDepartamento de GenéticaUniversidade Federal do ParanáCuritibaPRBrasilLaboratório de Polimorfismos e Ligação, Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brasil
| | - Lupe Furtado-Alle
- Laboratório de Polimorfismos e LigaçãoDepartamento de GenéticaUniversidade Federal do ParanáCuritibaPRBrasilLaboratório de Polimorfismos e Ligação, Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brasil
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22
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Peng H, Schopfer LM, Lockridge O. Origin of polyproline-rich peptides in human butyrylcholinesterase tetramers. Chem Biol Interact 2016; 259:63-69. [DOI: 10.1016/j.cbi.2016.02.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 02/09/2016] [Indexed: 11/15/2022]
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Schopfer LM, Lockridge O. Tetramer-organizing polyproline-rich peptides differ in CHO cell-expressed and plasma-derived human butyrylcholinesterase tetramers. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1864:706-714. [PMID: 26947244 DOI: 10.1016/j.bbapap.2016.03.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 02/12/2016] [Accepted: 03/02/2016] [Indexed: 11/18/2022]
Abstract
Tetrameric butyrylcholinesterase (BChE) in human plasma is the product of multiple genes, namely one BCHE gene on chromosome 3q26.1 and multiple genes that encode polyproline-rich peptides. The function of the polyproline-rich peptides is to assemble BChE into tetramers. CHO cells transfected with human BChE cDNA express BChE monomers and dimers, but only low quantities of tetramers. Our goal was to identify the polyproline-rich peptides in CHO-cell derived human BChE tetramers. CHO cell-produced human BChE tetramers were purified from serum-free culture medium. Peptides embedded in the tetramerization domain were released from BChE tetramers by boiling and identified by liquid chromatography-tandem mass spectrometry. A total of 270 proline-rich peptides were sequenced, ranging in size from 6-41 residues. The peptides originated from 60 different proteins that reside in multiple cell compartments including the nucleus, cytoplasm, and endoplasmic reticulum. No single protein was the source of the polyproline-rich peptides in CHO cell-expressed human BChE tetramers. In contrast, 70% of the tetramer-organizing peptides in plasma-derived BChE tetramers originate from lamellipodin. No protein source was identified for polyproline peptides containing up to 41 consecutive proline residues. In conclusion, the use of polyproline-rich peptides as a tetramerization motif is documented only for the cholinesterases, but is expected to serve other tetrameric proteins as well. The CHO cell data suggest that the BChE tetramer-organizing peptide can arise from a variety of proteins.
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Affiliation(s)
- Lawrence M Schopfer
- Eppley Institute, University of Nebraska Medical Center, Omaha, NE 68198-5950, USA.
| | - Oksana Lockridge
- Eppley Institute, University of Nebraska Medical Center, Omaha, NE 68198-5950, USA.
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24
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Alkanaimsh S, Karuppanan K, Guerrero A, Tu AM, Hashimoto B, Hwang MS, Phu ML, Arzola L, Lebrilla CB, Dandekar AM, Falk BW, Nandi S, Rodriguez RL, McDonald KA. Transient Expression of Tetrameric Recombinant Human Butyrylcholinesterase in Nicotiana benthamiana. FRONTIERS IN PLANT SCIENCE 2016; 7:743. [PMID: 27379103 PMCID: PMC4909763 DOI: 10.3389/fpls.2016.00743] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 05/17/2016] [Indexed: 05/08/2023]
Abstract
To optimize the expression, extraction and purification of plant-derived tetrameric recombinant human butyrylcholinesterase (prBChE), we describe the development and use of plant viral amplicon-based gene expression system; Tobacco Mosaic Virus (TMV) RNA-based overexpression vector (TRBO) to express enzymatically active FLAG-tagged plant made recombinant butyrylcholinesterase (rBChE) in Nicotiana benthamiana leaves using transient agroinfiltration. Two gene expression cassettes were designed to express the recombinant protein in either the ER or to the apoplastic compartment. Leaf homogenization was used to isolate ER-retained recombinant butyrylcholinesterase (prBChE-ER) while apoplast-targeted rBChE was isolated by either leaf homogenization (prBChE) or vacuum-extraction of apoplastic wash fluid (prBChE-AWF). rBChE from apoplast wash fluid had a higher specific activity but lower enzyme yield than leaf homogenate. To optimize the isolation and purification of total recombinant protein from leaf homogenates, an acidic extraction buffer was used. The acidic extraction buffer yielded >95% enzymatically active tetrameric rBChE as verified by Coomassie stained and native gel electrophoresis. Furthermore, when compared to human butyrylcholinesterase, the prBChE was found to be similar in terms of tetramerization and enzyme kinetics. The N-linked glycan profile of purified prBChE-ER was found to be mostly high mannose structures while the N-linked glycans on prBChE-AWF were primarily complex. The glycan profile of the prBChE leaf homogenates showed a mixture of high mannose, complex and paucimannose type N-glycans. These findings demonstrate the ability of plants to produce rBChE that is enzymatically active and whose oligomeric state is comparable to mammalian butyrylcholinesterase. The process of plant made rBChE tetramerization and strategies for improving its pharmacokinetics properties are also discussed.
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Affiliation(s)
- Salem Alkanaimsh
- Department of Chemical Engineering, University of California, DavisDavis, CA, USA
| | - Kalimuthu Karuppanan
- Department of Chemical Engineering, University of California, DavisDavis, CA, USA
| | - Andrés Guerrero
- Department of Chemistry, University of California, DavisDavis, CA, USA
| | - Aye M. Tu
- Department of Plant Science, University of California, DavisDavis, CA, USA
| | - Bryce Hashimoto
- Department of Chemical Engineering, University of California, DavisDavis, CA, USA
| | - Min Sook Hwang
- Department of Plant Pathology, University of California, DavisDavis, CA, USA
| | - My L. Phu
- Department of Plant Science, University of California, DavisDavis, CA, USA
| | - Lucas Arzola
- Department of Chemical Engineering, University of California, DavisDavis, CA, USA
| | | | - Abhaya M. Dandekar
- Department of Plant Science, University of California, DavisDavis, CA, USA
| | - Bryce W. Falk
- Department of Plant Pathology, University of California, DavisDavis, CA, USA
| | - Somen Nandi
- Department of Molecular and Cellular Biology, University of California, DavisDavis, CA, USA
- Department of Global HealthShare Initiative, University of California, DavisDavis, CA, USA
| | - Raymond L. Rodriguez
- Department of Molecular and Cellular Biology, University of California, DavisDavis, CA, USA
- Department of Global HealthShare Initiative, University of California, DavisDavis, CA, USA
| | - Karen A. McDonald
- Department of Chemical Engineering, University of California, DavisDavis, CA, USA
- Department of Global HealthShare Initiative, University of California, DavisDavis, CA, USA
- *Correspondence: Karen A. McDonald,
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25
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Abstract
Cocaine abuse is a world-wide public health and social problem without a US Food and Drug Administration-approved medication. An ideal anticocaine medication would accelerate cocaine metabolism, producing biologically inactive metabolites by administration of an efficient cocaine-specific exogenous enzyme. Our recent studies have led to the discovery of the desirable, highly efficient cocaine hydrolases (CocHs) that can efficiently detoxify and inactivate cocaine without affecting normal functions of the CNS. Preclinical and clinical data have demonstrated that these CocHs are safe for use in humans and are effective for accelerating cocaine metabolism. However, the actual therapeutic use of a CocH in cocaine addiction treatment is limited by its short biological half-life (e.g., 8 h or shorter in rats). Here we demonstrate a novel CocH form, a catalytic antibody analog, which is a fragment crystallizable (Fc)-fused CocH dimer (CocH-Fc) constructed by using CocH to replace the Fab region of human IgG1. The CocH-Fc not only has a high catalytic efficiency against cocaine but also, like an antibody, has a considerably longer biological half-life (e.g., ∼107 h in rats). A single dose of CocH-Fc was able to accelerate cocaine metabolism in rats even after 20 d and thus block cocaine-induced hyperactivity and toxicity for a long period. Given the general observation that the biological half-life of a protein drug is significantly longer in humans than in rodents, the CocH-Fc reported in this study could allow dosing once every 2-4 wk, or longer, for treatment of cocaine addiction in humans.
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26
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Reilly PJ, Rovira C. Computational Studies of Glycoside, Carboxylic Ester, and Thioester Hydrolase Mechanisms: A Review. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01312] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter J. Reilly
- Department
of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011-2230, United States
| | - Carme Rovira
- Departament de Química Orgànica
and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, 08028 Barcelona, Spain
- Institució
Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
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27
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Lockridge O. Review of human butyrylcholinesterase structure, function, genetic variants, history of use in the clinic, and potential therapeutic uses. Pharmacol Ther 2014; 148:34-46. [PMID: 25448037 DOI: 10.1016/j.pharmthera.2014.11.011] [Citation(s) in RCA: 277] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 11/17/2014] [Indexed: 10/24/2022]
Abstract
Phase I clinical trials have shown that pure human butyrylcholinesterase (BChE) is safe when administered to humans. A potential therapeutic use of BChE is for prevention of nerve agent toxicity. A recombinant mutant of BChE that rapidly inactivates cocaine is being developed as a treatment to help recovering cocaine addicts avoid relapse into drug taking. These clinical applications rely on knowledge of the structure, stability, and properties of BChE, information that is reviewed here. Gene therapy with a vector that sustains expression for a year from a single injection is a promising method for delivering therapeutic quantities of BChE.
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Affiliation(s)
- Oksana Lockridge
- Eppley Institute, University of Nebraska Medical Center, Omaha, NE 68198-5950, USA.
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28
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Abstract
Human butyrylcholinesterase protects against nerve agents and pesticides, but the quantity of this plasma-derived tetrameric bioscavenger is limited. The present study demonstrates that recombinantly produced butyrylcholinesterase can be converted into stable tetramers without the cellular machinery by providing polyproline peptides.
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29
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Fang L, Hou S, Xue L, Zheng F, Zhan CG. Amino-acid mutations to extend the biological half-life of a therapeutically valuable mutant of human butyrylcholinesterase. Chem Biol Interact 2014; 214:18-25. [PMID: 24582612 PMCID: PMC3996703 DOI: 10.1016/j.cbi.2014.02.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 02/09/2014] [Accepted: 02/16/2014] [Indexed: 10/25/2022]
Abstract
Cocaine is a widely abused and addictive drug without an FDA-approved medication. Our recently designed and discovered cocaine hydrolase, particularly E12-7 engineered from human butyrylcholinesterase (BChE), has the promise of becoming a valuable cocaine abuse treatment. An ideal anti-cocaine therapeutic enzyme should have not only a high catalytic efficiency against cocaine, but also a sufficiently long biological half-life. However, recombinant human BChE and the known BChE mutants have a much shorter biological half-life compared to the native human BChE. The present study aimed to extend the biological half-life of the cocaine hydrolase without changing its high catalytic activity against cocaine. Our strategy was to design possible amino-acid mutations that can introduce cross-subunit disulfide bond(s) and, thus, change the distribution of the oligomeric forms and extend the biological half-life. Three new BChE mutants (E364-532, E377-516, and E535) were predicted to have a more stable dimer structure with the desirable cross-subunit disulfide bond(s) and, therefore, a different distribution of the oligomeric forms and a prolonged biological half-life. The rational design was followed by experimental tests in vitro and in vivo, confirming that the rationally designed new BChE mutants, i.e. E364-532, E377-516, and E535, indeed had a remarkably different distribution of the oligomeric forms and prolonged biological half-life in rats from ∼7 to ∼13h without significantly changing the catalytic activity against (-)-cocaine. This is the first demonstration that rationally designed amino-acid mutations can significantly prolong the biological half-life of a high-activity enzyme without significantly changing the catalytic activity.
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Affiliation(s)
- Lei Fang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536, United States
| | - Shurong Hou
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536, United States
| | - Liu Xue
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536, United States
| | - Fang Zheng
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536, United States
| | - Chang-Guo Zhan
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536, United States.
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30
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Santarpia L, Grandone I, Contaldo F, Pasanisi F. Butyrylcholinesterase as a prognostic marker: a review of the literature. J Cachexia Sarcopenia Muscle 2013; 4:31-9. [PMID: 22956442 PMCID: PMC3581611 DOI: 10.1007/s13539-012-0083-5] [Citation(s) in RCA: 168] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Accepted: 07/24/2012] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Butyrylcholinesterase (BChE) is an α-glycoprotein synthesized in the liver. Its serum level decreases in many clinical conditions such as acute and chronic liver damage, inflammation, injury and infections, and malnutrition. METHODS AND RESULTS This review collects the main evidence on the emerging role of butyrylcholinesterase as a prognostic marker of liver and nonliver diseases as well as a marker of protein-energy malnutrition and obesity. In fact, serum concentrations and BChE activity seem to accurately reflect the availability of amino acidic substrates and/or derangement in protein synthesis due to hepatocellular damage. In cancer, with or without liver impairment, serum BChE levels serve as an accurate functional and prognostic indicator, useful for monitoring clinical and therapeutic interventions according to patients' prognosis. In the absence of inflammation, BChE could also serve as an index of the effectiveness of nutritional support. CONCLUSIONS Serum BChE assessment should be included in routine clinical diagnostic procedures to evaluate patient clinical conditions, in particular in cases of inflammation and/or protein-energy malnutrition.
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Affiliation(s)
- Lidia Santarpia
- Clinical Nutrition and Internal Medicine, Department of Clinical and Experimental Medicine, Federico II University Hospital, via Pansini 5, 80131, Naples, Italy,
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31
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Zheng F, Zhan CG. Modeling of pharmacokinetics of cocaine in human reveals the feasibility for development of enzyme therapies for drugs of abuse. PLoS Comput Biol 2012; 8:e1002610. [PMID: 22844238 PMCID: PMC3406004 DOI: 10.1371/journal.pcbi.1002610] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 05/29/2012] [Indexed: 12/05/2022] Open
Abstract
A promising strategy for drug abuse treatment is to accelerate the drug metabolism by administration of a drug-metabolizing enzyme. The question is how effectively an enzyme can actually prevent the drug from entering brain and producing physiological effects. In the present study, we have developed a pharmacokinetic model through a combined use of in vitro kinetic parameters and positron emission tomography data in human to examine the effects of a cocaine-metabolizing enzyme in plasma on the time course of cocaine in plasma and brain of human. Without an exogenous enzyme, cocaine half-lives in both brain and plasma are almost linearly dependent on the initial cocaine concentration in plasma. The threshold concentration of cocaine in brain required to produce physiological effects has been estimated to be 0.22±0.07 µM, and the threshold area under the cocaine concentration versus time curve (AUC) value in brain (denoted by AUC2∞) required to produce physiological effects has been estimated to be 7.9±2.7 µM·min. It has been demonstrated that administration of a cocaine hydrolase/esterase (CocH/CocE) can considerably decrease the cocaine half-lives in both brain and plasma, the peak cocaine concentration in brain, and the AUC2∞. The estimated maximum cocaine plasma concentration which a given concentration of drug-metabolizing enzyme can effectively prevent from entering brain and producing physiological effects can be used to guide future preclinical/clinical studies on cocaine-metabolizing enzymes. Understanding of drug-metabolizing enzymes is key to the science of pharmacokinetics. The general insights into the effects of a drug-metabolizing enzyme on drug kinetics in human should be valuable also in future development of enzyme therapies for other drugs of abuse. In this computational study, we have examined, for the first time, the potential effects of a drug-metabolizing enzyme on drug pharmacokinetics in human, showing that a high-activity drug-metabolizing enzyme can completely/effectively prevent the drug of abuse from entering brain to produce physiological effects. Based on this encouraging insight, it is feasible to develop enzyme therapies for drugs of abuse. Through pharmacokinetic modeling, we have demonstrated that, without an exogenous enzyme, the drug half-lives in both brain and plasma are almost linearly dependent on the initial drug concentration in plasma. This finding indicates that one may not simply say the half-life of a drug without clearly indicating the actual dose condition. We have also demonstrated for the first time how a high-activity drug-metabolizing enzyme can considerably decrease the peak concentration of drug in brain and drug half-lives in both brain and plasma. In addition, we have calculated the minimum (threshold) concentration of cocaine in brain required to produce physiological effects. The predicted threshold concentration, along with all of the general insights obtained in this study, will provide a rational base for future design of further experimental studies required for the enzyme therapy development.
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Affiliation(s)
- Fang Zheng
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky, United States of America
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32
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Sridhar GR, Sekhar T, Rao PVN, Rao AA. Human butyrylcholinesterase knock-out equivalent: Potential to assess role in Alzheimer’s disease. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/aad.2012.11001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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33
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Fang L, Pan Y, Muzyka JL, Zhan CG. Active site gating and substrate specificity of butyrylcholinesterase and acetylcholinesterase: insights from molecular dynamics simulations. J Phys Chem B 2011; 115:8797-805. [PMID: 21682268 PMCID: PMC3135420 DOI: 10.1021/jp112030p] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Butyrylcholinesterase (BChE) and acetylcholinesterase (AChE) are highly homologous proteins with distinct substrate preferences. In this study we compared the active sites of monomers and tetramers of human BChE and human AChE after performing molecular dynamics (MD) simulations in water-solvated systems. By comparing the conformational dynamics of gating residues of AChE and BChE, we found that the gating mechanisms of the main door of AChE and BChE are responsible for their different substrate specificities. Our simulation of the tetramers of AChE and BChE indicates that both enzymes could have two dysfunctional active sites due to their restricted accessibility to substrates. The further study on catalytic mechanisms of multiple forms of AChE and BChE would benefit from our comparison of the active sites of the monomers and tetramers of both enzymes.
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Affiliation(s)
- Lei Fang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, Kentucky 40536
| | - Yongmei Pan
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, Kentucky 40536
| | | | - Chang-Guo Zhan
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, Kentucky 40536
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34
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Yang B, Zhu Y, Wang Y, Chen G. Interaction identification of Zif268 and TATA(ZF) proteins with GC-/AT-rich DNA sequence: A theoretical study. J Comput Chem 2011; 32:416-28. [PMID: 20658568 DOI: 10.1002/jcc.21630] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Molecular dynamics (MD) simulations for Zif268 (a zinc-finger-protein binding specifically to the GC-rich DNA)-d(A(1) G(2) C(3) G(4) T(5) G(6) G(7) G(8) C(9) A(10) C(11) )(2) and TATA(ZF) (a zinc-finger-protein recognizing the AT-rich DNA)-d(A(1) C(2) G(3) C(4) T(5) A(6) T(7) A(8) A(9) A(10) A(11) G(12) G(13) )(2) complexes have been performed for investigating the DNA binding affinities and specific recognitions of zinc fingers to GC-rich and AT-rich DNA sequences. The binding free energies for the two systems have been further analyzed by using the molecular mechanics Poisson-Boltzmann surface area (MM-PBSA) method. The calculations of the binding free energies reveal that the affinity energy of Zif268-DNA complex is larger than that of TATA(ZF) -DNA one. The affinity between the zinc-finger-protein and DNA is mainly driven by more favorable van-der-Waals and nonpolar/solvation interactions in both complexes. However, the affinity energy difference of the two binding systems is mainly caused by the difference of van-der-Waals interactions and entropy components. The decomposition analysis of MM-PBSA free energies on each residue of the proteins predicts that the interactions between the residues with the positive charges and DNA favor the binding process; while the interactions between the residues with the negative charges and DNA behave in the opposite way. The interhydrogen-bonds at the protein-DNA interface and the induced intrafinger hydrogen bonds between the residues of protein for the Zif268-DNA complex have been identified at some key contact sites. However, only the interhydrogen-bonds between the residues of protein and DNA for TATA(ZF) -DNA complex have been found. The interactions of hydrogen-bonds, electrostatistics and van-der-Waals type at some new contact sites have been identified. Moreover, the recognition characteristics of the two studied zinc-finger-proteins have also been discussed.
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Affiliation(s)
- Bo Yang
- College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
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35
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Chou YL, Wu CC, Wang HW. Effects of bambuterol and terbutaline on isolated rat's tracheal smooth muscle. Eur Arch Otorhinolaryngol 2009; 267:1305-11. [PMID: 20012638 DOI: 10.1007/s00405-009-1173-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Accepted: 11/26/2009] [Indexed: 11/30/2022]
Abstract
Terbutaline (Bricanyl) and its prodrug Bambuterol (Bambec) are highly potent beta(2)-adrenoceptor agonists often used in asthma patients. Terbutaline in the form of inhaled short-acting bronchodilator relieves asthmatic symptoms. However, the effects of bambuterol given intratracheally have rarely been explored. To verify the effect of bambuterol and terbutaline, which act on the tracheal smooth muscle directly in vitro, we used our preparation to test the effects of bambuterol on isolated rat's tracheal smooth muscle compared with terbutaline. The following assessments of bambuterol and terbutaline were performed: (1) effect on tracheal smooth muscle resting tension; (2) effect on contraction caused by 10(-6) M methacholine as a parasympathetic mimetic; (3) effect of the drugs on electrically induced tracheal smooth muscle contractions. The results indicated that adding bambuterol induced a significant further contraction to 10(-6) M methacholine-induced contraction when the preparation was increased to 10(-4) M. But terbutaline elicited a relaxation response at a dose of 10(-6) M or more. Both bambuterol and terbutaline could inhibit electrical field stimulation (EFS) induced spike contraction. Terbutaline had an anti-cholinergic effect that could relieve asthmatic symptoms. But the effect of bambuterol acting on tracheal smooth muscle directly was controversial.
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Affiliation(s)
- Ying-Liang Chou
- Department of Otolaryngology-Head and Neck Surgery, Tri-Service General Hospital, National Defense Medical Center, No. 325, Sect. 2, Cheng-Gung Road, Neihu District, 114 Taipei, Taiwan, ROC
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36
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Butyrylcholinesterase for protection from organophosphorus poisons: catalytic complexities and hysteretic behavior. Arch Biochem Biophys 2009; 494:107-20. [PMID: 20004171 DOI: 10.1016/j.abb.2009.12.005] [Citation(s) in RCA: 163] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2009] [Revised: 11/24/2009] [Accepted: 12/01/2009] [Indexed: 12/13/2022]
Abstract
Butyrylcholinesterase is a promiscuous enzyme that displays complex kinetic behavior. It is toxicologically important because it detoxifies organophosphorus poisons (OP) by making a covalent bond with the OP. The OP and the butyrylcholinesterase are both inactivated in the process. Inactivation of butyrylcholinesterase has no adverse effects. However, inactivation of acetylcholinesterase in nerve synapses can be lethal. OP-inhibited butyrylcholinesterase and acetylcholinesterase can be reactivated with oximes provided the OP has not aged. Strategies for preventing the toxicity of OP include (a) treatment with an OP scavenger, (b) reaction of non-aged enzyme with oximes, (c) reactivation of aged enzyme, (d) slowing down aging with peripheral site ligands, and (e) design of mutants that rapidly hydrolyze OP. Option (a) has progressed through phase I clinical trials with human butyrylcholinesterase. Option (b) is in routine clinical use. The others are at the basic research level. Butyrylcholinesterase displays complex kinetic behavior including activation by positively charged esters, ability to hydrolyze amides, and a lag time (hysteresis) preceding hydrolysis of benzoylcholine and N-methylindoxyl acetate. Mass spectrometry has identified new OP binding motifs on tyrosine and lysine in proteins that have no active site serine. It is proposed, but not yet proven, that low dose exposure involves OP modification of proteins that have no active site serine.
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