1
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Wang B, Shao Y, Chen Z, Xia Y, Xue F, Jin W, Wu S, Zhang Y, Liu C. Photoinduced Catalyst-Free Deuterodefunctionalization of Aryltriazenes with CDCl 3. Org Lett 2024; 26:4329-4334. [PMID: 38743509 DOI: 10.1021/acs.orglett.4c01350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
A photoinduced deuterodetriazenation of aryltriazenes with CDCl3 under catalyst-free conditions is reported. The reactions featured simple operation, ecofriendly conditions, readily available reagents, inexpensive D sources, precise site selectivity, and a wide range of substrates. Since aryltriazenes could be readily synthesized from arylamine, this protocol can be used as a general method for easily and accurately incorporating deuterium into aromatic systems by using CDCl3 as a D source.
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Affiliation(s)
- Bin Wang
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
- Analysis and Testing Center, Xinjiang University, Urumqi 830017, P. R. China
| | - Yang Shao
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Ziren Chen
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Yu Xia
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Fei Xue
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Weiwei Jin
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Shaofeng Wu
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Yonghong Zhang
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
- Institute of Materia Medica, Xinjiang University, Urumqi 830017, P. R. China
| | - Chenjiang Liu
- Urumqi Key Laboratory of Green Catalysis and Synthesis Technology, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
- Institute of Materia Medica, Xinjiang University, Urumqi 830017, P. R. China
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2
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Ying Y, Li H. Native top-down mass spectrometry for monitoring the rapid chymotrypsin catalyzed hydrolysis reaction. Anal Chim Acta 2024; 1285:341971. [PMID: 38057065 DOI: 10.1016/j.aca.2023.341971] [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: 06/12/2023] [Revised: 10/13/2023] [Accepted: 10/26/2023] [Indexed: 12/08/2023]
Abstract
Enzymes play crucial roles in life sciences, pharmaceuticals and industries as biological catalysts that speed up biochemical reactions in living organisms. New catalytic reactions are continuously developed by enzymatic engineering to meet industrial needs, which thereby drives the development of analytical approaches for real-time reaction monitoring to reveal catalytic processes. Here, taking the hydrolase- chymotrypsin as a model system, we proposed a convenient method for monitoring catalytic processes through native top-down mass spectrometry (native TDMS). The chymotrypsin sample heterogeneity was first explored. By altering sample introduction modes and pHs, covalent and noncovalent enzymatic complexes, substrates and products can be monitored during the catalysis and further confirmed by tandem MS. Our results demonstrated that native TDMS based catalysis monitoring has distinctive strength on real-time inspection and continuous observation, making it a promising tool for characterizing more biocatalysts.
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Affiliation(s)
- Yujia Ying
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, 510006, China.
| | - Huilin Li
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, 510006, China; Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, 510006, China.
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3
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Duan Y, Zhong W, Zeng Z, Feng J, Xu J, Yang F, Liu J. Iodine-promoted transfer of dihydrogen from ketones to alkenes, triphenylmethyl, and diphenylmethyl derivatives. Chem Commun (Camb) 2023; 60:75-78. [PMID: 38018515 DOI: 10.1039/d3cc03409g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
Herein, a novel class of transfer hydrogenation agent, cycloheptanone, was successfully employed in metal-free hydrogenation facilitated by iodine. A series of alkenes, triphenylmethyl derivatives, and diphenylmethyl derivatives were reduced to the desired compounds in moderate to excellent yields. The transfer hydrodeuteration of alkenes using α-deuterated cyclododecanone exhibited high regioselectivity. Preliminary mechanism studies confirmed the origins of the two hydrogen atoms involved in the reduction of alkenes. The current study paves the way for the use of ketones as unique transfer hydrogenation agents in chemical synthesis.
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Affiliation(s)
- Yiping Duan
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
| | - Wenyi Zhong
- Department of Organic Chemistry, School of Science, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Zhaolan Zeng
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
| | - Jiajie Feng
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
| | - Jinyi Xu
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
| | - Fulai Yang
- Department of Organic Chemistry, School of Science, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Jie Liu
- Department of Organic Chemistry, School of Science, China Pharmaceutical University, Nanjing, 210009, P. R. China.
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4
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Li X, Li Y, Wang Z, Shan W, Liu R, Shi C, Qin H, Yuan L, Li X, Shi D. Nickel-Catalyzed Stereoselective Cascade C–F Functionalizations of gem-Difluoroalkenes. ACS Catal 2023. [DOI: 10.1021/acscatal.3c00047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Xiaowei Li
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Yuxiu Li
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
- School of Chemistry and Environment, Jiaying University, Meizhou 514015, Guangdong, P. R. China
| | - Zemin Wang
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Wenlong Shan
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Ruihua Liu
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Cong Shi
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Hongyun Qin
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Leifeng Yuan
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Xiangqian Li
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
| | - Dayong Shi
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, Shandong, P. R. China
- Laboratory of Marine Drugs and Biological Products, Pilot National Laboratory for Marine Science and Technology, 168 Weihai Road, Qingdao 266237, Shandong, P. R. China
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5
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Min XT, Mei YK, Chen BZ, He LB, Song TT, Ji DW, Hu YC, Wan B, Chen QA. Rhodium-Catalyzed Deuterated Tsuji-Wilkinson Decarbonylation of Aldehydes with Deuterium Oxide. J Am Chem Soc 2022; 144:11081-11087. [PMID: 35709491 DOI: 10.1021/jacs.2c04422] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The recent surge in the applications of deuterated drug candidates has rendered an urgent need for diverse deuterium labeling techniques. Herein, an efficient Rh-catalyzed deuterated Tsuji-Wilkinson decarbonylation of naturally available aldehydes with D2O is developed. In this reaction, D2O not only acts as a deuterated reagent and solvent but also promotes Rh-catalyzed decarbonylation. In addition, decarbonylative strategies for the synthesis of terminal monodeuterated alkenes from α,β-unsaturated aldehydes are within reach.
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Affiliation(s)
- Xiang-Ting Min
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yong-Kang Mei
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bing-Zhi Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Li-Bowen He
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ting-Ting Song
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Ding-Wei Ji
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yan-Cheng Hu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Boshun Wan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Qing-An Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
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6
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Hilgers R, Bijlsma J, Malacaria L, Vincken JP, Furia E, de Bruijn WJC. Transition metal cations catalyze 16O/ 18O exchange of catechol motifs with H 218O. Org Biomol Chem 2022; 20:9093-9097. [DOI: 10.1039/d2ob01884e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the presence of Fe(iii) and several other cations, catechol motifs undergo rapid 16O/18O exchange with H218O under mild conditions. This opens up synthetic possibilities and may have implications for studies using H218O as a mechanistic probe.
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Affiliation(s)
- Roelant Hilgers
- Laboratory of Food Chemistry, Wageningen University & Research, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands
| | - Judith Bijlsma
- Laboratory of Food Chemistry, Wageningen University & Research, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands
| | - Luana Malacaria
- Dipartimento di Chimica e Tecnologie Chimiche, Via P. Bucci, Cubo 12/D, Università della Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Jean-Paul Vincken
- Laboratory of Food Chemistry, Wageningen University & Research, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands
| | - Emilia Furia
- Dipartimento di Chimica e Tecnologie Chimiche, Via P. Bucci, Cubo 12/D, Università della Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Wouter J. C. de Bruijn
- Laboratory of Food Chemistry, Wageningen University & Research, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands
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7
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Zhao LL, Wu Y, Huang S, Zhang Z, Liu W, Yan X. Ortho-Selective Hydrogen Isotope Exchange of Phenols and Benzyl Alcohols by Mesoionic Carbene-Iridium Catalyst. Org Lett 2021; 23:9297-9302. [PMID: 34792358 DOI: 10.1021/acs.orglett.1c03685] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydrogen isotope exchange reactions of phenols and benzyl alcohols have been achieved by a mesoionic carbene-iridium catalyst with high ortho selectivity and high functional group tolerance. Control experiments indicated that acetate is crucial to realize the ortho selectivity, whereas density functional theory calculations supported an outer-sphere direction with hydrogen bonding between acetate and the hydroxyl group.
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Affiliation(s)
- Liang-Liang Zhao
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Yixin Wu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Shiqing Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Zengyu Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Wei Liu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xiaoyu Yan
- Department of Chemistry, Renmin University of China, Beijing 100872, China
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8
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Wang L, Xia Y, Derdau V, Studer A. Remote Site-Selective Radical C(sp 3 )-H Monodeuteration of Amides using D 2 O. Angew Chem Int Ed Engl 2021; 60:18645-18650. [PMID: 34114304 PMCID: PMC8456965 DOI: 10.1002/anie.202104254] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 05/26/2021] [Indexed: 12/18/2022]
Abstract
Site-selective incorporation of deuterium into biologically active compounds is of high interest in pharmaceutical industry. We present a mild and environmentally benign metal-free method for the remote selective radical C-H monodeuteration of aliphatic C-H bonds in various amides with inexpensive heavy water (D2 O) as the deuterium source. The method uses the easily installed N-allylsulfonyl moiety as an N-radical precursor that generates the remote C-radical via site-selective 1,5- or 1,6-hydrogen atom transfer (HAT). Methyl thioglycolate, that readily exchanges its proton with D2 O, serves as the radical deuteration reagent and as a chain-carrier. The highly site-selective monodeuteration has been applied to different types of unactivated sp3 -C-H bonds and also to the deuteration of C-H bonds next to heteroatoms. The potential utility of this method is further demonstrated by the site-selective incorporation of deuterium into natural product derivatives and drugs.
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Affiliation(s)
- Lin Wang
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
| | - Yong Xia
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
| | - Volker Derdau
- Sanofi (Germany)Integrated Drug Discovery, Isotope ChemistryIndustriepark Höchst, G87665926FrankfurtGermany
| | - Armido Studer
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
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9
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Lento C, Wilson DJ. Subsecond Time-Resolved Mass Spectrometry in Dynamic Structural Biology. Chem Rev 2021; 122:7624-7646. [PMID: 34324314 DOI: 10.1021/acs.chemrev.1c00222] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Life at the molecular level is a dynamic world, where the key players-proteins, oligonucleotides, lipids, and carbohydrates-are in a perpetual state of structural flux, shifting rapidly between local minima on their conformational free energy landscapes. The techniques of classical structural biology, X-ray crystallography, structural NMR, and cryo-electron microscopy (cryo-EM), while capable of extraordinary structural resolution, are innately ill-suited to characterize biomolecules in their dynamically active states. Subsecond time-resolved mass spectrometry (MS) provides a unique window into the dynamic world of biological macromolecules, offering the capacity to directly monitor biochemical processes and conformational shifts with a structural dimension provided by the electrospray charge-state distribution, ion mobility, covalent labeling, or hydrogen-deuterium exchange. Over the past two decades, this suite of techniques has provided important insights into the inherently dynamic processes that drive function and pathogenesis in biological macromolecules, including (mis)folding, complexation, aggregation, ligand binding, and enzyme catalysis, among others. This Review provides a comprehensive account of subsecond time-resolved MS and the advances it has enabled in dynamic structural biology, with an emphasis on insights into the dynamic drivers of protein function.
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Affiliation(s)
- Cristina Lento
- Department of Chemistry, York University, Toronto, Ontario M3J 1P3, Canada
| | - Derek J Wilson
- Department of Chemistry, York University, Toronto, Ontario M3J 1P3, Canada
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10
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Wang L, Xia Y, Derdau V, Studer A. Remote Site‐Selective Radical C(sp
3
)−H Monodeuteration of Amides using D
2
O. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104254] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Lin Wang
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Yong Xia
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Volker Derdau
- Sanofi (Germany) Integrated Drug Discovery, Isotope Chemistry Industriepark Höchst, G876 65926 Frankfurt Germany
| | - Armido Studer
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
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11
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Wilcox XE, Chung CB, Slade KM. Macromolecular crowding effects on the kinetics of opposing reactions catalyzed by alcohol dehydrogenase. Biochem Biophys Rep 2021; 26:100956. [PMID: 33665382 PMCID: PMC7905371 DOI: 10.1016/j.bbrep.2021.100956] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 01/03/2021] [Accepted: 02/09/2021] [Indexed: 12/01/2022] Open
Abstract
In order to better understand how the complex, densely packed, heterogeneous milieu of a cell influences enzyme kinetics, we exposed opposing reactions catalyzed by yeast alcohol dehydrogenase (YADH) to both synthetic and protein crowders ranging from 10 to 550 kDa. The results reveal that the effects from macromolecular crowding depend on the direction of the reaction. The presence of the synthetic polymers, Ficoll and dextran, decrease Vmax and Km for ethanol oxidation. In contrast, these crowders have little effect or even increase these kinetic parameters for acetaldehyde reduction. This increase in Vmax is likely due to excluded volume effects, which are partially counteracted by viscosity hindering release of the NAD+ product. Macromolecular crowding is further complicated by the presence of a depletion layer in solutions of dextran larger than YADH, which diminishes the hindrance from viscosity. The disparate effects from 25 g/L dextran or glucose compared to 25 g/L Ficoll or sucrose reveals that soft interactions must also be considered. Data from binary mixtures of glucose, dextran, and Ficoll support this “tuning” of opposing factors. While macromolecular crowding was originally proposed to influence proteins mainly through excluded volume effects, this work compliments the growing body of evidence revealing that other factors, such as preferential hydration, chemical interactions, and the presence of a depletion layer also contribute to the overall effect of crowding. Yeast alcohol dehydrogenase reduction of acetaldehyde is enhanced by crowding. Crowding effects on YADH kinetics depend on the direction of the reaction. Crowders like dextran can be used as a tool to elucidate enzyme mechanism. Excluded volume optimizes YADH hydride transfer; viscosity hinders product release. The presence of a depletion layer with large crowders mitigates their effects.
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Affiliation(s)
- Xander E Wilcox
- Department of Chemistry, University of California at Davis, CA, 95616, USA
| | - Charmaine B Chung
- Department of Chemistry, Hobart and William Smith Colleges, 300 Pulteney St, Geneva, NY, 14456, USA
| | - Kristin M Slade
- Department of Chemistry, Hobart and William Smith Colleges, 300 Pulteney St, Geneva, NY, 14456, USA
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12
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Huang L, Liu W, Zhao LL, Zhang Z, Yan X. Base-Catalyzed H/D Exchange Reaction of Difluoromethylarenes. J Org Chem 2021; 86:3981-3988. [PMID: 33591190 DOI: 10.1021/acs.joc.0c02827] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The budding deuteriodifluoromethyl group (CF2D) is a potentially significant functional group in medicinal chemistry. Herein, we investigated t-BuOK-catalyzed H/D exchange reaction of difluoromethylarenes in DMSO-d6 solution. The method provides excellent deuterium incorporation at the difluoromethyl group. Meanwhile, the effect of a trace amount of D2O in DMSO-d6 solution on the deuteration reaction was also investigated.
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Affiliation(s)
- Linwei Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Wei Liu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Liang-Liang Zhao
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Zengyu Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xiaoyu Yan
- Department of Chemistry, Renmin University of China, Beijing 100872, China
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13
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Wang Y, Wondisford FE, Song C, Zhang T, Su X. Metabolic Flux Analysis-Linking Isotope Labeling and Metabolic Fluxes. Metabolites 2020; 10:metabo10110447. [PMID: 33172051 PMCID: PMC7694648 DOI: 10.3390/metabo10110447] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/03/2020] [Accepted: 11/04/2020] [Indexed: 01/02/2023] Open
Abstract
Metabolic flux analysis (MFA) is an increasingly important tool to study metabolism quantitatively. Unlike the concentrations of metabolites, the fluxes, which are the rates at which intracellular metabolites interconvert, are not directly measurable. MFA uses stable isotope labeled tracers to reveal information related to the fluxes. The conceptual idea of MFA is that in tracer experiments the isotope labeling patterns of intracellular metabolites are determined by the fluxes, therefore by measuring the labeling patterns we can infer the fluxes in the network. In this review, we will discuss the basic concept of MFA using a simplified upper glycolysis network as an example. We will show how the fluxes are reflected in the isotope labeling patterns. The central idea we wish to deliver is that under metabolic and isotopic steady-state the labeling pattern of a metabolite is the flux-weighted average of the substrates’ labeling patterns. As a result, MFA can tell the relative contributions of converging metabolic pathways only when these pathways make substrates in different labeling patterns for the shared product. This is the fundamental principle guiding the design of isotope labeling experiment for MFA including tracer selection. In addition, we will also discuss the basic biochemical assumptions of MFA, and we will show the flux-solving procedure and result evaluation. Finally, we will highlight the link between isotopically stationary and nonstationary flux analysis.
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Affiliation(s)
- Yujue Wang
- Department of Medicine, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ 08901, USA; (Y.W.); (F.E.W.)
- Metabolomics Shared Resource, Rutgers Cancer Institute of New Jersey, New Brunswick, NJ 08903, USA
| | - Fredric E. Wondisford
- Department of Medicine, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ 08901, USA; (Y.W.); (F.E.W.)
| | - Chi Song
- Division of Biostatistics, College of Public Health, The Ohio State University, Columbus, OH 43210, USA;
| | - Teng Zhang
- Department of Mathematics, University of Central Florida, Orlando, FL 32816, USA;
| | - Xiaoyang Su
- Department of Medicine, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ 08901, USA; (Y.W.); (F.E.W.)
- Metabolomics Shared Resource, Rutgers Cancer Institute of New Jersey, New Brunswick, NJ 08903, USA
- Correspondence: ; Tel.: +1-732-235-5447
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14
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Grasso G. THE USE OF MASS SPECTROMETRY TO STUDY ZN-METALLOPROTEASE-SUBSTRATE INTERACTIONS. MASS SPECTROMETRY REVIEWS 2020; 39:574-585. [PMID: 31898821 DOI: 10.1002/mas.21621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 12/19/2019] [Indexed: 06/10/2023]
Abstract
Zinc metalloproteases (ZnMPs) participate in diverse biological reactions, encompassing the synthesis and degradation of all the major metabolites in living organisms. In particular, ZnMPs have been recognized to play a very important role in controlling the concentration level of several peptides and/or proteins whose homeostasis has to be finely regulated for the correct physiology of cells. Dyshomeostasis of aggregation-prone proteins causes pathological conditions and the development of several different diseases. For this reason, in recent years, many analytical approaches have been applied for studying the interaction between ZnMPs and their substrates and how environmental factors can affect enzyme activities. In this scenario, mass spectrometric methods occupy a very important role in elucidating different aspects of ZnMPs-substrates interaction. These range from identification of cleavage sites to quantitation of kinetic parameters. In this work, an overview of all the main achievements regarding the application of mass spectrometric methods to investigating ZnMPs-substrates interactions is presented. A general experimental protocol is also described which may prove useful to the study of similar interactions. © 2020 John Wiley & Sons Ltd. Mass Spec Rev.
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Affiliation(s)
- Giuseppe Grasso
- Department of Chemical Sciences, Università degli Studi di Catania, Viale Andrea Doria 6, Catania, 95125, Italy
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15
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Ledovskaya MS, Voronin VV, Polynski MV, Lebedev AN, Ananikov VP. Primary Vinyl Ethers as Acetylene Surrogate: A Flexible Tool for Deuterium-Labeled Pyrazole Synthesis. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000674] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Maria S. Ledovskaya
- Institute of Chemistry; Saint Petersburg State University; Universitetsky prospect 26 198504 Peterhof Russia
| | - Vladimir V. Voronin
- Institute of Chemistry; Saint Petersburg State University; Universitetsky prospect 26 198504 Peterhof Russia
| | - Mikhail V. Polynski
- Institute of Chemistry; Saint Petersburg State University; Universitetsky prospect 26 198504 Peterhof Russia
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences; Leninsky prospect 47 119991 Moscow Russia
| | - Andrey N. Lebedev
- Institute of Chemistry; Saint Petersburg State University; Universitetsky prospect 26 198504 Peterhof Russia
| | - Valentine P. Ananikov
- Institute of Chemistry; Saint Petersburg State University; Universitetsky prospect 26 198504 Peterhof Russia
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences; Leninsky prospect 47 119991 Moscow Russia
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16
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Liu W, Cao L, Zhang Z, Zhang G, Huang S, Huang L, Zhao P, Yan X. Mesoionic Carbene–Iridium Complex Catalyzed Ortho-Selective Hydrogen Isotope Exchange of Anilines with High Functional Group Tolerance. Org Lett 2020; 22:2210-2214. [DOI: 10.1021/acs.orglett.0c00402] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Wei Liu
- Department of Chemistry, Renmin University of China, Beijing 100872, People’s Republic of China
| | - Lei Cao
- Department of Chemistry, Renmin University of China, Beijing 100872, People’s Republic of China
| | - Zengyu Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, People’s Republic of China
| | - Gang Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, People’s Republic of China
| | - Shiqing Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, People’s Republic of China
| | - Linwei Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, People’s Republic of China
| | - Peng Zhao
- School of Materials Science and Engineering, Hubei University, Wuhan 430062, People’s Republic of China
| | - Xiaoyu Yan
- Department of Chemistry, Renmin University of China, Beijing 100872, People’s Republic of China
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17
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Zhao LL, Liu W, Zhang Z, Zhao H, Wang Q, Yan X. Ruthenium-Catalyzed ortho- and meta-H/D Exchange of Arenes. Org Lett 2019; 21:10023-10027. [PMID: 31797670 DOI: 10.1021/acs.orglett.9b03955] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Ruthenium-catalyzed aromatic H/D exchange in [D4]acetic acid has been developed. By using N-heteroarenes as directing groups, both ortho and meta positions are selectively deuterated with high levels of D incorporation. Moreover, this strategy provides an alternative way to achieve meta-C-H activation.
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Affiliation(s)
- Liang-Liang Zhao
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Wei Liu
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Zengyu Zhang
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Hongyan Zhao
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Qi Wang
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Xiaoyu Yan
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
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18
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van Geenen FAG, Franssen MCR, Zuilhof H, Nielen MWF. Reactive Laser Ablation Electrospray Ionization Time-Resolved Mass Spectrometry of Click Reactions. Anal Chem 2018; 90:10409-10416. [PMID: 30063331 PMCID: PMC6127799 DOI: 10.1021/acs.analchem.8b02290] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 07/31/2018] [Indexed: 11/30/2022]
Abstract
Reactions in confined compartments like charged microdroplets are of increasing interest, notably because of their substantially increased reaction rates. When combined with ambient ionization mass spectrometry (MS), reactions in charged microdroplets can be used to improve the detection of analytes or to study the molecular details of the reactions in real time. Here, we introduce a reactive laser ablation electrospray ionization (reactive LAESI) time-resolved mass spectrometry (TRMS) method to perform and study reactions in charged microdroplets. We demonstrate this approach with a class of reactions new to reactive ambient ionization MS: so-called click chemistry reactions. Click reactions are high-yielding reactions with a high atom efficiency, and are currently drawing significant attention from fields ranging from bioconjugation to polymer modification. Although click reactions are typically at least moderately fast (time scale of minutes to a few hours), in a reactive LAESI approach a substantial increase of reaction time is required for these reactions to occur. This increase was achieved using microdroplet chemistry and followed by MS using the insertion of a reaction tube-up to 1 m in length-between the LAESI source and the MS inlet, leading to near complete conversions due to significantly extended microdroplet lifetime. This novel approach allowed for the collection of kinetic data for a model (strain-promoted) click reaction between a substituted tetrazine and a strained alkyne and showed in addition excellent instrument stability, improved sensitivity, and applicability to other click reactions. Finally, the methodology was also demonstrated in a mass spectrometry imaging setting to show its feasibility in future imaging experiments.
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Affiliation(s)
- Fred A.
M. G. van Geenen
- Laboratory of Organic
Chemistry, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- TI-COAST, Science Park
904, 1098 XH Amsterdam, The Netherlands
| | - Maurice C. R. Franssen
- Laboratory of Organic
Chemistry, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Han Zuilhof
- Laboratory of Organic
Chemistry, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- School of Pharmaceutical Sciences and Technology, Tianjin University, 92 Weijin Road, Tianjin 300072, People’s Republic of China
| | - Michel W. F. Nielen
- Laboratory of Organic
Chemistry, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- RIKILT, Wageningen University & Research, P.O. Box 230, 6700 AE Wageningen, The Netherlands
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19
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Atzrodt J, Derdau V, Kerr WJ, Reid M. Deuterium- und tritiummarkierte Verbindungen: Anwendungen in den modernen Biowissenschaften. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201704146] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jens Atzrodt
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry; Industriepark Höchst, G876 65926 Frankfurt Deutschland
| | - Volker Derdau
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry; Industriepark Höchst, G876 65926 Frankfurt Deutschland
| | - William J. Kerr
- Department of Pure and Applied Chemistry, WestCHEM; University of Strathclyde; 295 Cathedral Street Glasgow Scotland G1 1XL Großbritannien
| | - Marc Reid
- Department of Pure and Applied Chemistry, WestCHEM; University of Strathclyde; 295 Cathedral Street Glasgow Scotland G1 1XL Großbritannien
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20
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Atzrodt J, Derdau V, Kerr WJ, Reid M. Deuterium- and Tritium-Labelled Compounds: Applications in the Life Sciences. Angew Chem Int Ed Engl 2018; 57:1758-1784. [PMID: 28815899 DOI: 10.1002/anie.201704146] [Citation(s) in RCA: 407] [Impact Index Per Article: 67.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 07/27/2017] [Indexed: 12/19/2022]
Abstract
Hydrogen isotopes are unique tools for identifying and understanding biological and chemical processes. Hydrogen isotope labelling allows for the traceless and direct incorporation of an additional mass or radioactive tag into an organic molecule with almost no changes in its chemical structure, physical properties, or biological activity. Using deuterium-labelled isotopologues to study the unique mass-spectrometric patterns generated from mixtures of biologically relevant molecules drastically simplifies analysis. Such methods are now providing unprecedented levels of insight in a wide and continuously growing range of applications in the life sciences and beyond. Tritium (3 H), in particular, has seen an increase in utilization, especially in pharmaceutical drug discovery. The efforts and costs associated with the synthesis of labelled compounds are more than compensated for by the enhanced molecular sensitivity during analysis and the high reliability of the data obtained. In this Review, advances in the application of hydrogen isotopes in the life sciences are described.
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Affiliation(s)
- Jens Atzrodt
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry, Industriepark Höchst, G876, 65926, Frankfurt, Germany
| | - Volker Derdau
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry, Industriepark Höchst, G876, 65926, Frankfurt, Germany
| | - William J Kerr
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, 295 Cathedral Street, Glasgow, Scotland, G1 1XL, UK
| | - Marc Reid
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, 295 Cathedral Street, Glasgow, Scotland, G1 1XL, UK
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21
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Roberts KM, Fitzpatrick PF. Measurement of Kinetic Isotope Effects in an Enzyme-Catalyzed Reaction by Continuous-Flow Mass Spectrometry. Methods Enzymol 2017; 596:149-161. [PMID: 28911769 PMCID: PMC6767924 DOI: 10.1016/bs.mie.2017.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
Kinetic isotope effects (KIEs) provide powerful probes of the mechanisms of enzyme-catalyzed reactions. In this chapter, we describe the use of continuous-flow mass spectrometry to determine the deuterium KIE for the enzyme N-acetylpolyamine oxidase based on the ratio of labeled and unlabeled products in mass spectra of whole reaction mixtures.
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Affiliation(s)
| | - Paul F Fitzpatrick
- University of Texas Health Science Center, San Antonio, TX, United States.
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22
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Lento C, Wilson DJ. Unravelling the mysteries of sub-second biochemical processes using time-resolved mass spectrometry. Analyst 2017; 142:1640-1653. [DOI: 10.1039/c7an00338b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Many important chemical and biochemical phenomena proceed on sub-second time scales.
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Affiliation(s)
| | - Derek J. Wilson
- Department of Chemistry
- York University
- Toronto
- Canada
- Centre for Research of Biomolecular Interactions
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23
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Linscott JA, Kapilashrami K, Wang Z, Senevirathne C, Bothwell IR, Blum G, Luo M. Kinetic isotope effects reveal early transition state of protein lysine methyltransferase SET8. Proc Natl Acad Sci U S A 2016; 113:E8369-E8378. [PMID: 27940912 PMCID: PMC5206543 DOI: 10.1073/pnas.1609032114] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Protein lysine methyltransferases (PKMTs) catalyze the methylation of protein substrates, and their dysregulation has been linked to many diseases, including cancer. Accumulated evidence suggests that the reaction path of PKMT-catalyzed methylation consists of the formation of a cofactor(cosubstrate)-PKMT-substrate complex, lysine deprotonation through dynamic water channels, and a nucleophilic substitution (SN2) transition state for transmethylation. However, the molecular characters of the proposed process remain to be elucidated experimentally. Here we developed a matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) method and corresponding mathematic matrix to determine precisely the ratios of isotopically methylated peptides. This approach may be generally applicable for examining the kinetic isotope effects (KIEs) of posttranslational modifying enzymes. Protein lysine methyltransferase SET8 is the sole PKMT to monomethylate histone 4 lysine 20 (H4K20) and its function has been implicated in normal cell cycle progression and cancer metastasis. We therefore implemented the MS-based method to measure KIEs and binding isotope effects (BIEs) of the cofactor S-adenosyl-l-methionine (SAM) for SET8-catalyzed H4K20 monomethylation. A primary intrinsic 13C KIE of 1.04, an inverse intrinsic α-secondary CD3 KIE of 0.90, and a small but statistically significant inverse CD3 BIE of 0.96, in combination with computational modeling, revealed that SET8-catalyzed methylation proceeds through an early, asymmetrical SN2 transition state with the C-N and C-S distances of 2.35-2.40 Å and 2.00-2.05 Å, respectively. This transition state is further supported by the KIEs, BIEs, and steady-state kinetics with the SAM analog Se-adenosyl-l-selenomethionine (SeAM) as a cofactor surrogate. The distinct transition states between protein methyltransferases present the opportunity to design selective transition-state analog inhibitors.
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Affiliation(s)
- Joshua A Linscott
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Program of Pharmacology, Weill Graduate School of Medical Science, Cornell University, New York, NY 10021
| | - Kanishk Kapilashrami
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Zhen Wang
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461
| | - Chamara Senevirathne
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Ian R Bothwell
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Gil Blum
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Minkui Luo
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065;
- Program of Pharmacology, Weill Graduate School of Medical Science, Cornell University, New York, NY 10021
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24
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Hydrogen deuterium exchange mass spectrometry in biopharmaceutical discovery and development – A review. Anal Chim Acta 2016; 940:8-20. [DOI: 10.1016/j.aca.2016.08.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 07/25/2016] [Accepted: 08/07/2016] [Indexed: 01/14/2023]
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25
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Measuring specificity in multi-substrate/product systems as a tool to investigate selectivity in vivo. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1864:70-6. [PMID: 26321598 DOI: 10.1016/j.bbapap.2015.08.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 08/07/2015] [Accepted: 08/25/2015] [Indexed: 01/24/2023]
Abstract
Multiple substrate enzymes present a particular challenge when it comes to understanding their activity in a complex system. Although a single target may be easy to model, it does not always present an accurate representation of what that enzyme will do in the presence of multiple substrates simultaneously. Therefore, there is a need to find better ways to both study these enzymes in complicated systems, as well as accurately describe the interactions through kinetic parameters. This review looks at different methods for studying multiple substrate enzymes, as well as explores options on how to most accurately describe an enzyme's activity within these multi-substrate systems. Identifying and defining this enzymatic activity should help clear the way to using in vitro systems to accurately predicting the behavior of multi-substrate enzymes in vivo. This article is part of a Special Issue entitled: Physiological Enzymology and Protein Functions.
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26
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Liuni P, Deng B, Wilson DJ. Comparing equilibrium and kinetic protein unfolding using time-resolved electrospray-coupled ion mobility mass spectrometry. Analyst 2015; 140:6973-9. [DOI: 10.1039/c5an00843c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We apply a new hyphenated method, TRESI-IMS-MS, to compare equilibrium and kinetic unfolding intermediates of cytochrome c.
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Affiliation(s)
- Peter Liuni
- Department of Chemistry and Centre for Research in Mass Spectrometry
- York University
- Toronto
- Canada
| | - Bin Deng
- Department of Chemistry and Centre for Research in Mass Spectrometry
- York University
- Toronto
- Canada
| | - Derek J. Wilson
- Department of Chemistry and Centre for Research in Mass Spectrometry
- York University
- Toronto
- Canada
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27
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Zinck N, Stark AK, Wilson DJ, Sharon M. An improved rapid mixing device for time-resolved electrospray mass spectrometry measurements. ChemistryOpen 2014; 3:109-14. [PMID: 25050229 PMCID: PMC4101726 DOI: 10.1002/open.201402002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Indexed: 12/12/2022] Open
Abstract
Time series data can provide valuable insight into the complexity of biological reactions. Such information can be obtained by mass-spectrometry-based approaches that measure pre-steady-state kinetics. These methods are based on a mixing device that rapidly mixes the reactants prior to the on-line mass measurement of the transient intermediate steps. Here, we describe an improved continuous-flow mixing apparatus for real-time electrospray mass spectrometry measurements. Our setup was designed to minimize metal–solution interfaces and provide a sheath flow of nitrogen gas for generating stable and continuous spray that consequently enhances the signal-to-noise ratio. Moreover, the device was planned to enable easy mounting onto a mass spectrometer replacing the commercial electrospray ionization source. We demonstrate the performance of our apparatus by monitoring the unfolding reaction of cytochrome C, yielding improved signal-to-noise ratio and reduced experimental repeat errors.
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Affiliation(s)
- Nicholas Zinck
- Department of Chemistry, York University Toronto, ON M3J 1P3 (Canada)
| | - Ann-Kathrin Stark
- Department of Biological Chemistry, Weizmann Institute of Science 76100 Rehovot (Israel) E-mail:
| | - Derek J Wilson
- Department of Chemistry, York University Toronto, ON M3J 1P3 (Canada)
| | - Michal Sharon
- Department of Biological Chemistry, Weizmann Institute of Science 76100 Rehovot (Israel) E-mail:
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28
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Advances in kinetic isotope effect measurement techniques for enzyme mechanism study. Molecules 2013; 18:9278-92. [PMID: 23917115 PMCID: PMC6270257 DOI: 10.3390/molecules18089278] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 07/22/2013] [Accepted: 07/29/2013] [Indexed: 11/17/2022] Open
Abstract
Kinetic isotope effects (KIEs) are a very powerful tool for investigating enzyme mechanisms. Precision of measurement is the most important factor for KIE determinations, especially for small heavy atom KIEs. Internal competition is commonly used to measure small KIEs on V/K. Several methods, including such as liquid scintillation counting, mass spectrometry, nuclear magnetic resonance spectroscopy and polarimetry have been used to determine KIEs. In this paper, which does not aspire to be an exhaustive review, we briefly review different experimental approaches for the measurement of KIEs on enzymatic reaction with an emphasis on newer techniques employing mass spectrometry and nuclear magnetic resonance spectrometry as well as some corresponding examples.
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