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Wang K, Hong Q, Zhu C, Xu Y, Li W, Wang Y, Chen W, Gu X, Chen X, Fang Y, Shen Y, Liu S, Zhang Y. Metal-ligand dual-site single-atom nanozyme mimicking urate oxidase with high substrates specificity. Nat Commun 2024; 15:5705. [PMID: 38977710 PMCID: PMC11231224 DOI: 10.1038/s41467-024-50123-4] [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: 02/19/2024] [Accepted: 07/02/2024] [Indexed: 07/10/2024] Open
Abstract
In nature, coenzyme-independent oxidases have evolved in selective catalysis using isolated substrate-binding pockets. Single-atom nanozymes (SAzymes), an emerging type of non-protein artificial enzymes, are promising to simulate enzyme active centers, but owing to the lack of recognition sites, realizing substrate specificity is a formidable task. Here we report a metal-ligand dual-site SAzyme (Ni-DAB) that exhibited selectivity in uric acid (UA) oxidation. Ni-DAB mimics the dual-site catalytic mechanism of urate oxidase, in which the Ni metal center and the C atom in the ligand serve as the specific UA and O2 binding sites, respectively, characterized by synchrotron soft X-ray absorption spectroscopy, in situ near ambient pressure X-ray photoelectron spectroscopy, and isotope labeling. The theoretical calculations reveal the high catalytic specificity is derived from not only the delicate interaction between UA and the Ni center but also the complementary oxygen reduction at the beta C site in the ligand. As a potential application, a Ni-DAB-based biofuel cell using human urine is constructed. This work unlocks an approach of enzyme-like isolated dual sites in boosting the selectivity of non-protein artificial enzymes.
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Affiliation(s)
- Kaiyuan Wang
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Qing Hong
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Caixia Zhu
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Yuan Xu
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Wang Li
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Ying Wang
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Wenhao Chen
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Xiang Gu
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Xinghua Chen
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Yanfeng Fang
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Yanfei Shen
- Medical School, Southeast University, Nanjing, 210009, China.
| | - Songqin Liu
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China
| | - Yuanjian Zhang
- Jiangsu Engineering Research Center for Carbon-Rich Materials and Devices, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Nanjing, 211189, China.
- Department of Oncology, Zhongda Hospital, Southeast University, Nanjing, 210009, China.
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2
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Wang QQ, Song J, Wei D. Origin of Chemoselectivity of Halohydrin Dehalogenase-Catalyzed Epoxide Ring-Opening Reactions. J Chem Inf Model 2024; 64:4530-4541. [PMID: 38808649 DOI: 10.1021/acs.jcim.4c00640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
By performing molecular dynamics (MD), quantum mechanical/molecular mechanical (QM/MM) calculations, and QM cluster calculations, the origin of chemoselectivity of halohydrin dehalogenase (HHDH)-catalyzed ring-opening reactions of epoxide with the nucleophilic reagent NO2- has been explored. Four possible chemoselective pathways were considered, and the computed results indicate that the pathway associated with the nucleophilic attack on the Cα position of epoxide by NO2- is most energetically favorable and has an energy barrier of 12.9 kcal/mol, which is close to 14.1 kcal/mol derived from experimental kinetic data. A hydrogen bonding network formed by residues Ser140, Tyr153, and Arg157 can strengthen the electrophilicity of the active site of the epoxide substrate to affect chemoselectivity. To predict the energy barrier trends of the chemoselective transition states, multiple analyses including distortion analysis and electrophilic Parr function (Pk+) analysis were carried out with or without an enzyme environment. The obtained insights should be valuable for the rational design of enzyme-catalyzed and biomimetic organocatalytic epoxide ring-opening reactions with special chemoselectivity.
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Affiliation(s)
- Qian-Qian Wang
- College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Jinshuai Song
- College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Donghui Wei
- College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
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3
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Gao J, Li L, Shen S, Ai G, Wang B, Guo F, Yang T, Han H, Xu Z, Pan G, Fan K. Cofactor-independent C-C bond cleavage reactions catalyzed by the AlpJ family of oxygenases in atypical angucycline biosynthesis. Beilstein J Org Chem 2024; 20:1198-1206. [PMID: 38887580 PMCID: PMC11181247 DOI: 10.3762/bjoc.20.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Accepted: 05/07/2024] [Indexed: 06/20/2024] Open
Abstract
Biosynthesis of atypical angucyclines involves unique oxidative B-ring cleavage and rearrangement reactions, which are catalyzed by AlpJ-family oxygenases, including AlpJ, JadG, and GilOII. Prior investigations established the essential requirement for FADH2/FMNH2 as cofactors when utilizing the quinone intermediate dehydrorabelomycin as a substrate. In this study, we unveil a previously unrecognized facet of these enzymes as cofactor-independent oxygenases when employing the hydroquinone intermediate CR1 as a substrate. The enzymes autonomously drive oxidative ring cleavage and rearrangement reactions of CR1, yielding products identical to those observed in cofactor-dependent reactions of AlpJ-family oxygenases. Furthermore, the AlpJ- and JadG-catalyzed reactions of CR1 could be quenched by superoxide dismutase, supporting a catalytic mechanism wherein the substrate CR1 reductively activates molecular oxygen, generating a substrate radical and the superoxide anion O2 •-. Our findings illuminate a substrate-controlled catalytic mechanism of AlpJ-family oxygenases, expanding the realm of cofactor-independent oxygenases. Notably, AlpJ-family oxygenases stand as a pioneering example of enzymes capable of catalyzing oxidative reactions in either an FADH2/FMNH2-dependent or cofactor-independent manner.
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Affiliation(s)
- Jinmin Gao
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
- University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Beijing 101408, China
| | - Liyuan Li
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
| | - Shijie Shen
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
- University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Beijing 101408, China
| | - Guomin Ai
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
| | - Bin Wang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
- University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Beijing 101408, China
| | - Fang Guo
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
| | - Tongjian Yang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
- University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Beijing 101408, China
| | - Hui Han
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
| | - Zhengren Xu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Guohui Pan
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
- University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Beijing 101408, China
| | - Keqiang Fan
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No. 1 Beichen West Road, Beijing 100101, China
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Xi Z, Xie J, Hu J, Wang QC, Wang Z, Yang X, Zong L, Zhang M, Sun X, Sun S, Han J. Polyvinylpyrrolidone-Coated Cubic Hollow Nanocages of PdPt 3 and PdIr 3 as Highly Efficient Self-Cascade Uricase/Peroxidase Mimics. NANO LETTERS 2024; 24:3432-3440. [PMID: 38391135 DOI: 10.1021/acs.nanolett.4c00071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Uricase-catalyzed uric acid (UA) degradation has been applied for hyperuricemia therapy, but this medication is limited by H2O2 accumulation, which can cause oxidative stress of cells, resulting in many other health issues. Herein, we report a robust cubic hollow nanocage (HNC) system based on polyvinylpyrrolidone-coated PdPt3 and PdIr3 to serve as highly efficient self-cascade uricase/peroxidase mimics to achieve the desired dual catalysis for both UA degradation and H2O2 elimination. These HNCs have hollow cubic shape with average wall thickness of 1.5 nm, providing desired synergy to enhance catalyst's activity and stability. Density functional theory calculations suggest the PdIr3 HNC surface tend to promote OH*/O* desorption for better peroxidase-like catalysis, while the PdPt3 HNC surface accelerates the UA oxidation by facilitating O2-to-H2O2 conversion. The dual catalysis power demonstrated by these HNCs in cell studies suggests their great potential as a new type of nanozyme for treating hyperuricemia.
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Affiliation(s)
- Zheng Xi
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Jing Xie
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Jun Hu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Qin-Chao Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Ziyu Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Xiaoqiao Yang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Liying Zong
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Mengyao Zhang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Xiaohuan Sun
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Shouheng Sun
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Jie Han
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
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5
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Chen F, Wang J, Chen L, Lin H, Han D, Bao Y, Wang W, Niu L. A Wearable Electrochemical Biosensor Utilizing Functionalized Ti 3C 2T x MXene for the Real-Time Monitoring of Uric Acid Metabolite. Anal Chem 2024; 96:3914-3924. [PMID: 38387027 DOI: 10.1021/acs.analchem.3c05672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Wearable, noninvasive sensors enable the continuous monitoring of metabolites in sweat and provide clinical information related to an individual's health and disease states. Uric acid (UA) is a key indicator highly associated with gout, hyperuricaemia, hypertension, kidney disease, and Lesch-Nyhan syndrome. However, the detection of UA levels typically relies on invasive blood tests. Therefore, developing a wearable device for noninvasive monitoring of UA concentrations in sweat could facilitate real-time personalized disease prevention. Here, we introduce 1,3,6,8-pyrene tetrasulfonic acid sodium salt (PyTS) as a bifunctional molecule functionalized with Ti3C2Tx via π-π conjugation to design nonenzymatic wearable sensors for sensitive and selective detection of UA concentration in human sweat. PyTS@Ti3C2Tx provides many oxidation-reduction active groups to enhance the electrocatalytic ability of the UA oxidation reaction. The PyTS@Ti3C2Tx-based electrochemical sensor demonstrates highly sensitive detection of UA in the concentration range of 5 μM-100 μM, exhibiting a lower detection limit of 0.48 μM compared to the uricase-based sensor (0.84 μM). In volunteers, the PyTS@Ti3C2Tx-based wearable sensor is integrated with flexible microfluidic sweat sampling and wireless electronics to enable real-time monitoring of UA levels during aerobic exercise. Simultaneously, it allows for comparison of blood UA levels via a commercial UA analyzer. Herein, this study provides a promising electrocatalyst strategy for nonenzymatic electrochemical UA sensor, enabling noninvasive real-time monitoring of UA levels in human sweat and personalized disease prevention.
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Affiliation(s)
- Fan Chen
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Jinhao Wang
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Lijuan Chen
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
- School of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, China
| | - Haoliang Lin
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Dongxue Han
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Yu Bao
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Wei Wang
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Li Niu
- Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China
- School of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, China
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
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6
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Catapano L, Long F, Yamashita K, Nicholls RA, Steiner RA, Murshudov GN. Neutron crystallographic refinement with REFMAC5 from the CCP4 suite. Acta Crystallogr D Struct Biol 2023; 79:1056-1070. [PMID: 37921806 PMCID: PMC7615533 DOI: 10.1107/s2059798323008793] [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: 08/06/2023] [Accepted: 10/05/2023] [Indexed: 11/04/2023] Open
Abstract
Hydrogen (H) atoms are abundant in macromolecules and often play critical roles in enzyme catalysis, ligand-recognition processes and protein-protein interactions. However, their direct visualization by diffraction techniques is challenging. Macromolecular X-ray crystallography affords the localization of only the most ordered H atoms at (sub-)atomic resolution (around 1.2 Å or higher). However, many H atoms of biochemical significance remain undetectable by this method. In contrast, neutron diffraction methods enable the visualization of most H atoms, typically in the form of deuterium (2H) atoms, at much more common resolution values (better than 2.5 Å). Thus, neutron crystallography, although technically demanding, is often the method of choice when direct information on protonation states is sought. REFMAC5 from the Collaborative Computational Project No. 4 (CCP4) is a program for the refinement of macromolecular models against X-ray crystallographic and cryo-EM data. This contribution describes its extension to include the refinement of structural models obtained from neutron crystallographic data. Stereochemical restraints with accurate bond distances between H atoms and their parent atom nuclei are now part of the CCP4 Monomer Library, the source of prior chemical information used in the refinement. One new feature for neutron data analysis in REFMAC5 is refinement of the protium/deuterium (1H/2H) fraction. This parameter describes the relative 1H/2H contribution to neutron scattering for hydrogen isotopes. The newly developed REFMAC5 algorithms were tested by performing the (re-)refinement of several entries available in the PDB and of one novel structure (FutA) using either (i) neutron data only or (ii) neutron data supplemented by external restraints to a reference X-ray crystallographic structure. Re-refinement with REFMAC5 afforded models characterized by R-factor values that are consistent with, and in some cases better than, the originally deposited values. The use of external reference structure restraints during refinement has been observed to be a valuable strategy, especially for structures at medium-low resolution.
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Affiliation(s)
- Lucrezia Catapano
- Randall Centre for Cell and Molecular Biophysics, Faculty of Life Sciences and Medicine, King’s College London, London SE1 9RT, United Kingdom
- Structural Studies, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, United Kingdom
| | - Fei Long
- Structural Studies, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, United Kingdom
| | - Keitaro Yamashita
- Structural Studies, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, United Kingdom
| | - Robert A. Nicholls
- Structural Studies, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, United Kingdom
| | - Roberto A. Steiner
- Randall Centre for Cell and Molecular Biophysics, Faculty of Life Sciences and Medicine, King’s College London, London SE1 9RT, United Kingdom
- Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy
| | - Garib N. Murshudov
- Structural Studies, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, United Kingdom
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Ortega P, Gil-Guerrero S, González-Sánchez L, Sanz-Sanz C, Jambrina PG. Spin-Forbidden Addition of Molecular Oxygen to Stable Enol Intermediates-Decarboxylation of 2-Methyl-1-tetralone-2-carboxylic Acid. Int J Mol Sci 2023; 24:ijms24087424. [PMID: 37108586 PMCID: PMC10138960 DOI: 10.3390/ijms24087424] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
The deprotonation of an organic substrate is a common preactivation step for the enzymatic cofactorless addition of O2 to this substrate, as it promotes charge-transfer between the two partners, inducing intersystem crossing between the triplet and singlet states involved in the process. Nevertheless, the spin-forbidden addition of O2 to uncharged ligands has also been observed in the laboratory, and the detailed mechanism of how the system circumvents the spin-forbiddenness of the reaction is still unknown. One of these examples is the cofactorless peroxidation of 2-methyl-3,4-dihydro-1-naphthol, which will be studied computationally using single and multi-reference electronic structure calculations. Our results show that the preferred mechanism is that in which O2 picks a proton from the substrate in the triplet state, and subsequently hops to the singlet state in which the product is stable. For this reaction, the formation of the radical pair is associated with a higher barrier than that associated with the intersystem crossing, even though the absence of the negative charge leads to relatively small values of the spin-orbit coupling.
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Affiliation(s)
- Pablo Ortega
- Departamento de Química-Física, Universidad de Salamanca, 37008 Salamanca, Spain
| | - Sara Gil-Guerrero
- Departamento de Química-Física, Universidad de Salamanca, 37008 Salamanca, Spain
- CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | | | - Cristina Sanz-Sanz
- Departamento de Química Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Pablo G Jambrina
- Departamento de Química-Física, Universidad de Salamanca, 37008 Salamanca, Spain
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8
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Zhang QY, Li X, Luo J, Li X, Song J, Wei D. Cofactor-Free Dioxygenases-Catalyzed Reaction Pathway via Proton-Coupled Electron Transfer. J Phys Chem B 2023; 127:95-103. [PMID: 36525303 DOI: 10.1021/acs.jpcb.2c03161] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Understanding the general mechanism of the metal-free and cofactor-free oxidases and oxygenases catalyzed activation of triplet O2 is one of the most challenging questions in the field of enzymatic catalysis. Herein, we have performed Quantum Mechanics/Molecular Mechanics (QM/MM) multiscale simulations to reveal the detailed mechanism of the HOD catalyzed (i.e., 1-H-3-hydroxy-4-oxoquinaldine 2,4-dioxygenase from Arthrobacter nitroguajacolicus Rü61a) decomposition of N-heteroaromatic compounds. The complete catalytic mechanism includes four steps: (1) proton transfer from 1-H-3-hydroxy-4-oxoquinaldine (QND) substrate to His251 residue coupled with an electron transfer from QND to triplet O2 (i.e., PCET), (2) formation of C-O bond via an open-shell singlet diradical recombination pathway, (3) ring-closure to form a bicyclic ring, and (4) dissociation of CO. The dissociation of CO is determined as the rate-limiting step, and its calculated energy barrier of 14.9 kcal/mol is consistent with the 15.5 kcal/mol barrier derived from experimental kinetic data. The mechanistic profile is not only valuable for understanding the fundamental pathway of cofactor-free oxidases and oxygenases-catalyzed reactions involving the triplet O2 activation but also discloses a new pathway that undergoes the processes of PCET and open-shell singlet transition state.
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Affiliation(s)
- Qiao-Yu Zhang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan450001, China
| | - Xing Li
- Department of Traditional Chinese Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong510280, China
| | - Jing Luo
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan450001, China
| | - Xue Li
- Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials and Engineering, Henan University, Kaifeng475001, China
| | - Jinshuai Song
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan450001, China
| | - Donghui Wei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan450001, China
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9
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Wang X, Wang YN, Pei Z, Li SJ, Wei D, Lan Y. N-Heterocyclic Carbene/Brønsted Acid Cooperatively Catalyzed Conversions of α, β-Unsaturated Carbonyls: Hydrogen Bond Donor/Acceptor-Electrophile/Nucleophile Combination Models. ACS Catal 2022. [DOI: 10.1021/acscatal.2c05373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Xinghua Wang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Ya-Nan Wang
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 400030, China
| | - Zhipeng Pei
- Institue for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Adelaide, South Australia 5042, Australia
- Department of Chemistry, Faculty of Science, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Shi-Jun Li
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Donghui Wei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Yu Lan
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 400030, China
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10
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Jiao Y, Zhu Y, Zeng S, Wang S, Chen J, Zhou X, Ma G. Characterization of a novel marine microbial uricase from Priestia flexa and evaluation of the effects of CMCS conjugation on its enzymatic properties. Prep Biochem Biotechnol 2022:1-11. [PMID: 36398928 DOI: 10.1080/10826068.2022.2145611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A novel uricase producing marine bacterium Priestia flexa alkaAU was isolated and identified. The 16S rDNA and the uricase coding gene were sequenced, analyzed and submitted to GenBank. The uricase from Priestia flexa alkaAU (PFU) was purified, determined to be 58.87 kDa, and conjugated with carboxymethyl chitosan (CMCS) by ionic gelation. CMCS conjugation had no effect on the optimum pH of PFU but decreased the optimum temperature by 10 °C. CMCS conjugation increased the specific activity of PFU by 53% at the human body temperature (37 °C) and small intestine's pH (pH 6.8). Uricase thermostabilizing ability of CMCS was significant in the range of 37-80 °C but not at lower temperatures. For improvement of the pH stability of PFU, CMCS was more effective at pHs 3-5 than pHs 6-11. CMCS increased the half-life of PFU against artificial intestinal fluid by 1.5 folds, which demonstrated the potential capability of CMCS-PFU for oral administration.
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Affiliation(s)
- YuLiang Jiao
- School of Marine Sciences and Fisheries, Jiangsu Ocean University, Lianyungang, Jiangsu Province, People’s Republic of China
| | - YuYing Zhu
- School of Marine Sciences and Fisheries, Jiangsu Ocean University, Lianyungang, Jiangsu Province, People’s Republic of China
| | - ShuMin Zeng
- School of Marine Sciences and Fisheries, Jiangsu Ocean University, Lianyungang, Jiangsu Province, People’s Republic of China
| | - ShuFang Wang
- School of Marine Sciences and Fisheries, Jiangsu Ocean University, Lianyungang, Jiangsu Province, People’s Republic of China
| | - Jing Chen
- School of Marine Sciences and Fisheries, Jiangsu Ocean University, Lianyungang, Jiangsu Province, People’s Republic of China
| | - XiangHong Zhou
- School of Marine Sciences and Fisheries, Jiangsu Ocean University, Lianyungang, Jiangsu Province, People’s Republic of China
| | - GuiZhen Ma
- School of Marine Sciences and Fisheries, Jiangsu Ocean University, Lianyungang, Jiangsu Province, People’s Republic of China
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11
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Prangé T, Carpentier P, Dhaussy AC, van der Linden P, Girard E, Colloc'h N. Comparative study of the effects of high hydrostatic pressure per se and high argon pressure on urate oxidase ligand stabilization. Acta Crystallogr D Struct Biol 2022; 78:162-173. [DOI: 10.1107/s2059798321012134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 11/15/2021] [Indexed: 11/11/2022] Open
Abstract
The stability of the tetrameric enzyme urate oxidase in complex with excess of 8-azaxanthine was investigated either under high hydrostatic pressure per se or under a high pressure of argon. The active site is located at the interface of two subunits, and the catalytic activity is directly related to the integrity of the tetramer. This study demonstrates that applying pressure to a protein–ligand complex drives the thermodynamic equilibrium towards ligand saturation of the complex, revealing a new binding site. A transient dimeric intermediate that occurs during the pressure-induced dissociation process was characterized under argon pressure and excited substates of the enzyme that occur during the catalytic cycle can be trapped by pressure. Comparison of the different structures under pressure infers an allosteric role of the internal hydrophobic cavity in which argon is bound, since this cavity provides the necessary flexibility for the active site to function.
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12
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Li X, Li X, Zhang QY, Lv P, Jia Y, Wei D. Cofactor-free ActVA-Orf6 monooxygenase catalysis via proton-coupled electron transfer: A QM/MM study. Org Biomol Chem 2022; 20:5525-5534. [DOI: 10.1039/d2ob00848c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Uncovering the comprehensive catalytic mechanism for the activation of triplet O2 through metal-free and cofactor-free oxidases and oxygenases remains one of the most challenging questions in the area of enzymatic...
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13
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Han LL, Zhang QY, Li X, Qiao Y, Lan Y, Wei D. The chiral pyridoxal-catalyzed biomimetic Mannich reaction: the mechanism and origin of stereoselectivity. Org Chem Front 2022. [DOI: 10.1039/d2qo00705c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A biomimetic organocatalyst with a pyridoxal-like structure is one of the most successful examples of catalyzing organic reactions under mild conditions in an asymmetric synthesis field.
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Affiliation(s)
- Li-Li Han
- Green Catalysis Center and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Qiao-Yu Zhang
- Green Catalysis Center and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Xue Li
- Green Catalysis Center and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Yan Qiao
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan 450001, P. R. China
| | - Yu Lan
- Green Catalysis Center and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Donghui Wei
- Green Catalysis Center and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
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14
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Zhang QY, Wang Y, Li SJ, Wang Y, Wei D. Organocatalytic insertion into C–B bonds by in situ generated carbene: mechanism, role of the catalyst, and origin of stereoselectivity. Catal Sci Technol 2022. [DOI: 10.1039/d1cy01232k] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The calculated results showed that C–H⋯X (X = I, Br) hydrogen bond interactions should be the determining factors of stereoselectivity, and FMO overlap mode and ELF analyses along IRC results were performed to explore the nature of carbene insertion.
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Affiliation(s)
- Qiao-Yu Zhang
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Yang Wang
- Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, 136 Science Avenue, Zhengzhou 450002, Henan Province, P.R. China
| | - Shi-Jun Li
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Yanyan Wang
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
| | - Donghui Wei
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, Henan, P. R. China
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15
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Yang TT, Zhang M, Zhang QY, Wang C, Chen LH, Wei D. Transformation of 1,1′-biphosphirane-M(CO)5 (M = Mo, Cr, W) complexes: Possible mechanisms and reactivity of active intermediates. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2021.113420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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16
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Deng Q, Mu F, Qiao Y, Wei D. N-Heterocyclic Carbene-Catalyzed Asymmetric C-O Bond Construction Between Benzoic Acid and o-Phthalaldehyde: Mechanism and Origin of Stereoselectivity. Chem Asian J 2021; 16:2346-2350. [PMID: 34224204 DOI: 10.1002/asia.202100351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 06/21/2021] [Indexed: 12/27/2022]
Abstract
A computational study was contributed to explore the origin of stereoselectivity of NHC-mediated cyclization reaction between benzoic acid and o-phthalaldehyde for asymmetric construction of phthalidyl ester. The most energetically favorable pathway mainly includes the following steps: (1) nucleophilic attack on carbonyl carbon of o-phthalaldehyde by catalyst NHC, (2) formation of Breslow intermediate, (3) oxidation by DQ, (4) asymmetric formation of dual C-O bonds, and (5) dissociation of catalyst with the product. The C-O bond formation was testified as the stereoselectivity-determining step, the R-configurational pathway is more energetically favorable than the S-configurational one. The non-covalent interaction (NCI) and atom-in-molecule (AIM) analyses were performed to reveal that the O-H ⋅⋅⋅ O and C-H ⋅⋅⋅ O hydrogen-bond interactions are the key factors for controlling the stereoselectivity. The detailed mechanism and origin of stereoselectivity give useful insights for understanding organocatalytic reactions for asymmetric construction of C-O bond.
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Affiliation(s)
- Qianqian Deng
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Fangjing Mu
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Yan Qiao
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University of Light Industry, 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Donghui Wei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
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17
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Ortega P, Gil-Guerrero S, Veselinova A, Zanchet A, González-Sánchez L, Jambrina PG, Sanz-Sanz C. Multi- and single-reference methods for the analysis of multi-state peroxidation of enolates. J Chem Phys 2021; 154:144303. [PMID: 33858147 DOI: 10.1063/5.0046906] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In spite of being spin-forbidden, some enzymes are capable of catalyzing the incorporation of O2(Σg-3) to organic substrates without needing any cofactor. It has been established that the process followed by these enzymes starts with the deprotonation of the substrate forming an enolate. In a second stage, the peroxidation of the enolate formation occurs, a process in which the system changes its spin multiplicity from a triplet state to a singlet state. In this article, we study the addition of O2 to enolates using state-of-the-art multi-reference and single-reference methods. Our results confirm that intersystem crossing is promoted by stabilization of the singlet state along the reaction path. When multi-reference methods are used, large active spaces are required, and in this situation, semistochastic heat-bath configuration interaction emerges as a powerful method to study these multi-configurational systems and is in good agreement with PNO-LCCSD(T) when the system is well-represented by a single-configuration.
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Affiliation(s)
- P Ortega
- Departamento de Química-Física, University of Salamanca, Salamanca 37008, Spain
| | - S Gil-Guerrero
- Departamento de Química-Física, University of Salamanca, Salamanca 37008, Spain
| | - A Veselinova
- Departamento de Química-Física, University of Salamanca, Salamanca 37008, Spain
| | - A Zanchet
- Instituto de Física Fundamental (CSIC), Madrid 28006, Spain
| | - L González-Sánchez
- Departamento de Química-Física, University of Salamanca, Salamanca 37008, Spain
| | - P G Jambrina
- Departamento de Química-Física, University of Salamanca, Salamanca 37008, Spain
| | - C Sanz-Sanz
- Departamento de Química Física Aplicada. Universidad Autónoma de Madrid, Madrid 28049, Spain
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18
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Habib U, Riaz M, Hofmann M. Unraveling the Way Acetaldehyde is Formed from Acetylene: A Study Based on DFT. ACS OMEGA 2021; 6:6924-6933. [PMID: 33748606 PMCID: PMC7970554 DOI: 10.1021/acsomega.0c06159] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 02/12/2021] [Indexed: 05/05/2023]
Abstract
Acetylene hydratase (AH) of Pelobacter acetylenicus is a tungsten (W)-containing iron-sulfur enzyme that catalyzes the transformation of acetylene to acetaldehyde, the exact/true reaction mechanism of which is still in question. Scientists utilized different computational approaches to understand the reaction mechanism of acetylene hydration. Some identified it as a multistep (4-16) process that starts with the displacement of a water molecule present at the active site of AH with acetylene. However, some said that there is no need to displace water with acetylene at the active site of AH. As the reaction mechanism for the conversion of acetylene to acetaldehyde is still controversial and needs to be investigated further, DFT studies were performed on the model complexes derived from the native protein X-ray crystal structure of AH. Based on the computational results, here we are proposing the nucleophilic reaction mechanism where the water (Wat1424) molecule is coordinated to the W center and Asp13 is assumed to be in an anionic form. The Wat1424 molecule is activated by W and then donates one of its protons to the anionic Asp13, forming the W-bound hydroxide and protonated Asp13. The W-bound hydroxide then attacks the C1 atom of acetylene together with the transfer of a proton from Asp13 to its C2 atom, resulting in the formation of a vinyl alcohol intermediate complex. The energy barrier associated with this step is 14.4 kcal/mol. The final, rate-limiting, step corresponds to the tautomerization of the vinyl alcohol intermediate to acetaldehyde via intermolecular assistance of two water molecules, associated with an energy barrier of 18.9 kcal/mol. Also, the influence of the metal on the hydration of acetylene is studied when W is replaced with Mo.
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Affiliation(s)
- Uzma Habib
- Research
Center for Modeling & Simulation (RCMS), National University of Sciences & Technology (NUST), Islamabad 44000, Pakistan
| | - Mahum Riaz
- Research
Center for Modeling & Simulation (RCMS), National University of Sciences & Technology (NUST), Islamabad 44000, Pakistan
| | - Matthias Hofmann
- Anorganisch
Chemisches Institüt, Ruprecht-Karls-Universität, Heidelberg 69120, Germany
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19
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Liu Q, Wan K, Shang Y, Wang ZG, Zhang Y, Dai L, Wang C, Wang H, Shi X, Liu D, Ding B. Cofactor-free oxidase-mimetic nanomaterials from self-assembled histidine-rich peptides. NATURE MATERIALS 2021; 20:395-402. [PMID: 33257794 DOI: 10.1038/s41563-020-00856-6] [Citation(s) in RCA: 73] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 10/14/2020] [Indexed: 05/21/2023]
Abstract
Natural oxidases mainly rely on cofactors and well-arranged amino acid residues for catalysing electron-transfer reactions but suffer from non-recovery of their activity upon externally induced protein unfolding. However, it remains unknown whether residues at the active site can catalyse similar reactions in the absence of the cofactor. Here, we describe a series of self-assembling, histidine-rich peptides, as short as a dipeptide, with catalytic function similar to that of haem-dependent peroxidases. The histidine residues of the peptide chains form periodic arrays that are able to catalyse H2O2 reduction reactions efficiently through the formation of reactive ternary complex intermediates. The supramolecular catalyst exhibiting the highest activity could be switched between inactive and active states without loss of activity for ten cycles of heating/cooling or acidification/neutralization treatments, demonstrating the reversible assembly/disassembly of the active residues. These findings may aid the design of advanced biomimetic catalytic materials and provide a model for primitive cofactor-free enzymes.
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Affiliation(s)
- Qing Liu
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China
| | - Kaiwei Wan
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China
| | - Yingxu Shang
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China
| | - Zhen-Gang Wang
- State Key Laboratory of Organic-Inorganic Composites, Key Laboratory of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing, China.
| | - Yiyang Zhang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, China
| | - Luru Dai
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China
| | - Chen Wang
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China
- University of the Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Hui Wang
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China.
| | - Xinghua Shi
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China
- University of the Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Dongsheng Liu
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, China
| | - Baoquan Ding
- CAS Key Laboratory of Nanosystem and Hierarchial Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, People's Republic of China.
- University of the Chinese Academy of Sciences, Beijing, People's Republic of China.
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20
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Yang T, Wang C, Li S, Zhang M, Wei D, Lan Y. Possible Mechanisms and Origin of Selectivities for Phosphine‐Catalyzed [2+n] (n=3, 4) Annulations of Saturated Amines and δ‐Acetoxy Allenoates. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202000679] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Ting‐Ting Yang
- Green Catalysis Center, and College of Chemistry Zhengzhou University 100 Science Avenue Zhengzhou 450001, Henan P. R. China
| | - Congcong Wang
- School of Pharmaceutical Sciences Zhengzhou University Zhengzhou 450001 P. R. China
| | - Shi‐Jun Li
- Green Catalysis Center, and College of Chemistry Zhengzhou University 100 Science Avenue Zhengzhou 450001, Henan P. R. China
| | - Min Zhang
- Green Catalysis Center, and College of Chemistry Zhengzhou University 100 Science Avenue Zhengzhou 450001, Henan P. R. China
| | - Donghui Wei
- Green Catalysis Center, and College of Chemistry Zhengzhou University 100 Science Avenue Zhengzhou 450001, Henan P. R. China
| | - Yu Lan
- Green Catalysis Center, and College of Chemistry Zhengzhou University 100 Science Avenue Zhengzhou 450001, Henan P. R. China
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21
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Jiang J, Ding D, Wang J, Lin X, Diao G. Three-dimensional nitrogen-doped graphene-based metal-free electrochemical sensors for simultaneous determination of ascorbic acid, dopamine, uric acid, and acetaminophen. Analyst 2021; 146:964-970. [PMID: 33284293 DOI: 10.1039/d0an01912g] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Three-dimensional nitrogen-doped graphene (3D-NG) networks, yielded by hydrothermal reaction and freeze-drying treatment, were used as building blocks to construct a metal-free quadruplet electrochemical sensor for simultaneous detection of ascorbic acid (AA), dopamine (DA), uric acid (UA), and acetaminophen (AP). The introduced 3D-NG materials with a 3D porous structure and a nitrogen doping effect were beneficial for the generation of multidimensional electron transfer pathways and the improvement of electrocatalytic activities by modulating their electronic properties, which could contribute to the effective differentiation of the four analytes in their quaternary mixture. Well-resolved oxidation peaks and enhanced response currents of AA, DA, UA, and AP were obtained from the 3D-NG-based electrodes. For the individual determination of one analyte, the linear concentration ranges of AA, DA, UA, and AP were 20-10 000, 1-1000, 0.5-1000, and 0.1-600 μM with detection limits of 3.91, 0.26, 0.12, and 0.02 μM (S/N = 3), respectively. After the synchronous change of the concentrations of AA, DA, UA, and AP, desirable linear relationships were observed in the ranges of 100-7000, 2-600, 1-800, and 10-550 μM with detection limits of 24.33, 0.37, 0.21, and 1.87 μM (S/N = 3), respectively. This sensitive sensing platform was successfully used to monitor AA, DA, UA, and AP in human urine samples, which indicated that 3D-NG could become a promising electrode material for the simultaneous monitoring of multiple electroactive species.
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Affiliation(s)
- Jingjing Jiang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, PR China.
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22
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McGregor L, Földes T, Bui S, Moulin M, Coquelle N, Blakeley MP, Rosta E, Steiner RA. Joint neutron/X-ray crystal structure of a mechanistically relevant complex of perdeuterated urate oxidase and simulations provide insight into the hydration step of catalysis. IUCRJ 2021; 8:46-59. [PMID: 33520242 PMCID: PMC7792999 DOI: 10.1107/s2052252520013615] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 10/12/2020] [Indexed: 06/12/2023]
Abstract
Cofactor-independent urate oxidase (UOX) is an ∼137 kDa tetrameric enzyme essential for uric acid (UA) catabolism in many organisms. UA is first oxidized by O2 to de-hydro-isourate (DHU) via a peroxo intermediate. DHU then undergoes hydration to 5-hy-droxy-isourate (5HIU). At different stages of the reaction both catalytic O2 and water occupy the 'peroxo hole' above the organic substrate. Here, high-resolution neutron/X-ray crystallographic analysis at room temperature has been integrated with molecular dynamics simulations to investigate the hydration step of the reaction. The joint neutron/X-ray structure of perdeuterated Aspergillus flavus UOX in complex with its 8-azaxanthine (8AZA) inhibitor shows that the catalytic water molecule (W1) is present in the peroxo hole as neutral H2O, oriented at 45° with respect to the ligand. It is stabilized by Thr57 and Asn254 on different UOX protomers as well as by an O-H⋯π interaction with 8AZA. The active site Lys10-Thr57 dyad features a charged Lys10-NH3 + side chain engaged in a strong hydrogen bond with Thr57OG1, while the Thr57OG1-HG1 bond is rotationally dynamic and oriented toward the π system of the ligand, on average. Our analysis offers support for a mechanism in which W1 performs a nucleophilic attack on DHUC5 with Thr57HG1 central to a Lys10-assisted proton-relay system. Room-temperature crystallography and simulations also reveal conformational heterogeneity for Asn254 that modulates W1 stability in the peroxo hole. This is proposed to be an active mechanism to facilitate W1/O2 exchange during catalysis.
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Affiliation(s)
- Lindsay McGregor
- Randall Centre for Cell and Molecular Biophysics, King’s College London, London SE1 1UL, United Kingdom
- Large Scale Structures Group, Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Cedex 9, Grenoble, France
| | - Tamás Földes
- Department of Chemistry, King’s College London, London SE1 1DB, United Kingdom
- Department of Physics and Astronomy, University College, London WC1E 6BT, United Kingdom
| | - Soi Bui
- Randall Centre for Cell and Molecular Biophysics, King’s College London, London SE1 1UL, United Kingdom
| | - Martine Moulin
- Life Sciences Group, Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Cedex 9, Grenoble, France
| | - Nicolas Coquelle
- Large Scale Structures Group, Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Cedex 9, Grenoble, France
| | - Matthew P. Blakeley
- Large Scale Structures Group, Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Cedex 9, Grenoble, France
| | - Edina Rosta
- Department of Chemistry, King’s College London, London SE1 1DB, United Kingdom
- Department of Physics and Astronomy, University College, London WC1E 6BT, United Kingdom
| | - Roberto A. Steiner
- Randall Centre for Cell and Molecular Biophysics, King’s College London, London SE1 1UL, United Kingdom
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23
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Ortega P, Zanchet A, Sanz-Sanz C, Gómez-Carrasco S, González-Sánchez L, Jambrina PG. DpgC-Catalyzed Peroxidation of 3,5-Dihydroxyphenylacetyl-CoA (DPA-CoA): Insights into the Spin-Forbidden Transition and Charge Transfer Mechanisms*. Chemistry 2020; 27:1700-1712. [PMID: 32975323 DOI: 10.1002/chem.202002993] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Indexed: 11/06/2022]
Abstract
Despite being a very strong oxidizing agent, most organic molecules are not oxidized in the presence of O2 at room temperature because O2 is a diradical whereas most organic molecules are closed-shell. Oxidation then requires a change in the spin state of the system, which is forbidden according to non-relativistic quantum theory. To overcome this limitation, oxygenases usually rely on metal or redox cofactors to catalyze the incorporation of, at least, one oxygen atom into an organic substrate. However, some oxygenases do not require any cofactor, and the detailed mechanism followed by these enzymes remains elusive. To fill this gap, here the mechanism for the enzymatic cofactor-independent oxidation of 3,5-dihydroxyphenylacetyl-CoA (DPA-CoA) is studied by combining multireference calculations on a model system with QM/MM calculations. Our results reveal that intersystem crossing takes place without requiring the previous protonation of molecular oxygen. The characterization of the electronic states reveals that electron transfer is concomitant with the triplet-singlet transition. The enzyme plays a passive role in promoting the intersystem crossing, although spontaneous reorganization of the water wire connecting the active site with the bulk presets the substrate for subsequent chemical transformations. The results show that the stabilization of the singlet radical-pair between dioxygen and enolate is enough to promote spin-forbidden reaction without the need for neither metal cofactors nor basic residues in the active site.
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Affiliation(s)
- Pablo Ortega
- Departamento de Química Física, University of Salamanca, Salamanca, 37008, Spain
| | - Alexandre Zanchet
- Departamento de Química Física, University of Salamanca, Salamanca, 37008, Spain.,Instituto de Física Fundamental (CSIC), Madrid, 28006, Spain
| | - Cristina Sanz-Sanz
- Departamento de Química Física Aplicada, University Autónoma de Madrid, Madrid, 28049, Spain
| | | | | | - Pablo G Jambrina
- Departamento de Química Física, University of Salamanca, Salamanca, 37008, Spain
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24
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Kang L, Huo S, Meng L, Li X. Reaction Mechanism and Kinetics study on Addition of CCl
4
to 1‐hexene Catalyzed by Mo‐Mo Quintuply‐bond. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Lixia Kang
- College of Chemistry and Material Science Hebei Normal University Road East of 2nd Ring South Shijiazhuang 050024 China
| | - Suhong Huo
- College of Chemistry and Material Science Hebei Normal University Road East of 2nd Ring South Shijiazhuang 050024 China
| | - Lingpeng Meng
- National Demonstratin Center for Experimental Chemistry Hebei Normal University Road East of 2nd Ring South Shijiazhuang 050024 China
| | - Xiaoyan Li
- College of Chemistry and Material Science Hebei Normal University Road East of 2nd Ring South Shijiazhuang 050024 China
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25
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Ren R, Bi S, Wang L, Zhao W, Wei D, Li T, Xu W, Liu M, Wu Y. Terpyridine-based Pd(ii)/Ni(ii) organometallic framework nano-sheets supported on graphene oxide-investigating the fabrication, tuning of catalytic properties and synergetic effects. RSC Adv 2020; 10:23080-23090. [PMID: 35520341 PMCID: PMC9054763 DOI: 10.1039/d0ra02195d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 06/01/2020] [Indexed: 11/24/2022] Open
Abstract
Tailoring the structures of catalysts and the arrangement of organic bimetallic catalysts are essential in both fundamental research and applications. However, they still impose enormous challenges such as size and active species distribution, ordered uniformity, and controllable composition, which are critical in determining their specific activities and efficiency. Herein, a novel terpyridine-based hetero-bimetallic Ni/Pd nanosheet supported on graphene oxide (denoted as GO@Tpy-Ni/Pd) was fabricated, which exhibited higher catalytic activity, substrate applicability and recyclability for the Suzuki coupling reaction under mild conditions. The catalytic mechanism was heterogeneous catalysis at the interface and the synergetic effect between Pd and Ni resulted in a little Ni(0)/Pd(0) cluster including Pd(ii)/Ni(ii) as a whole being formed through electron transfer on the catalytic surface. This phenomenon could be interpreted as the nanoscale clusters of Ni/Pd being the real active centre stabilized by the ligand and GO and the synergetic effect. The absorption and desorption of different substrates and products on Ni/Pd clusters, as calculated by DFT, was proved to be another key factor. The synergistic effect between Ni and Pd atom was the crucial factor for enhancing catalytic activity.![]()
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Affiliation(s)
- Ruirui Ren
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Sa Bi
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Linhong Wang
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Wuduo Zhao
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Donghui Wei
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Tiesheng Li
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Wenjian Xu
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Minghua Liu
- Henan Institute of Advanced Technology, Zhengzhou University Zhengzhou 450001 P. R. China.,Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences Zhongguancun North First Street 2 Beijing 100190 P. R. China
| | - Yangjie Wu
- College of Chemistry, Zhengzhou University Zhengzhou 450001 P. R. China
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26
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Cui H, Li K, Wang Y, Song M, Wang C, Wei D, Li EQ, Duan Z, Mathey F. Copper(i)/Ganphos catalysis: enantioselective synthesis of diverse spirooxindoles using iminoesters and alkyl substituted methyleneindolinones. Org Biomol Chem 2020; 18:3740-3746. [PMID: 32367104 DOI: 10.1039/d0ob00546k] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A copper-catalyzed asymmetric 1,3-dipolar cycloaddition of glycine iminoesters with alkyl substituted 3-methylene-2-oxindoles is described. By using de novo design of P-stereogenic phosphines as ligands, spiro[pyrrolidin-3,3'-oxindole]s are generated in good to excellent yields with high asymmetric induction. A further reduced catalyst loading of 0.1 mol% is sufficient to achieve a satisfactory enantioselectivity of 90% ee. The DFT calculations suggest the second Michael addition of the 1,3-dipole to be the rate- and enantio-determining step. A key feature of this 1,3-dipolar cycloaddition is the wide substrate applicability, even with alkyl aldehyde-derived azomethine ylide; thus it has streamlined a highly enantioselective access to a new class of antiproliferative agents, MDM2-p53.
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Affiliation(s)
- Hao Cui
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Ke Li
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Yue Wang
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Manman Song
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Congcong Wang
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Donghui Wei
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Er-Qing Li
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Zheng Duan
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - François Mathey
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
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27
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Li L, Xue X, Sun Y, Zhao W, Li T, Liu M, Wu Y. Self-assembly Palladacycle Thiophene Imine Monolayer—Investigating on Catalytic Activity and Mechanism for Coupling Reaction. Chem Res Chin Univ 2020. [DOI: 10.1007/s40242-020-9087-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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28
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Berta D, Buigues PJ, Badaoui M, Rosta E. Cations in motion: QM/MM studies of the dynamic and electrostatic roles of H + and Mg 2+ ions in enzyme reactions. Curr Opin Struct Biol 2020; 61:198-206. [PMID: 32065923 DOI: 10.1016/j.sbi.2020.01.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 12/17/2022]
Abstract
Here we discuss current trends in the simulations of enzymatic reactions focusing on phosphate catalysis. The mechanistic details of the proton transfers coupled to the phosphate cleavage is one of the key challenges in QM/MM calculations of these and other enzyme catalyzed reactions. The lack of experimental information offers both an opportunity for computations as well as often unresolved controversies. We discuss the example of small GTPases including the important human Ras protein. The high dimensionality and chemical complexity of these reactions demand carefully chosen computational techniques both in terms of the underlying quantum chemical theory and the sampling of the conformational ensemble. We also point out the important role of Mg2+ ions, and recent advances in their transient involvement in the catalytic mechanisms.
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Affiliation(s)
- Dénes Berta
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom
| | - Pedro J Buigues
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom
| | - Magd Badaoui
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom
| | - Edina Rosta
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom.
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29
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He N, Zhu Z, Li F, Zhu Y, Qu L, Chen H. Theoretical understanding mechanisms and stereoselectivities of [2+2] cycloaddition of ketenes with ketimines catalyzed by bifunctional N-heterocyclic carbene. Struct Chem 2020. [DOI: 10.1007/s11224-019-01389-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Chen JH, Wei D, Yang G, Ma JG, Cheng P. A systematic investigation of structural transformation in a copper pyrazolato system: a case study. Dalton Trans 2020; 49:1116-1123. [PMID: 31894791 DOI: 10.1039/c9dt04263f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Dissolution-recrystallization structural transformation (DRST) is a powerful tool to unravel unequivocally the mechanism of dynamic conversion processes, based on the structures of the initial reactants, final products and sometimes intermediates isolated from the reaction mixture. Herein, we illustrate the details of the conversion processes of (CuIpz)3 into [CuII(OH)pz]6 (pzH = 4-chloro-3,5-diphenylpyrazole) through DRSTs. Based on crystal structure determination and spectroscopic methods, the most encountered species, (CuIpz)3, is in equilibrium with (CuIpz)4 in solution with the tetramer becoming dominant at low temperature, indicating an entropy-controlled conversion between these two structural isomers. The CuI trimer/tetramer in solution further experiences an oxidation if exposed to the open air, resulting in the formation of a pentanuclear mixed-valence intermediate CuI3CuII2(OMe)2pz5 which can be isolated as single crystals at -20 °C and has been structurally characterized for the first time. The final product isolated from the solution is the fully oxidized hexanuclear [CuII(OMe)pz]6, which is easily transformed into [CuII(OH)pz]6 in the presence of humidity.
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Affiliation(s)
- Jing-Huo Chen
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China.
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31
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Wang C, Li SJ, Zhang M, Wei D, Ding L. Origin of stereoselectivity in an isothiourea catalyzed Michael addition reaction of aryl ester with vinyl disulfone. NEW J CHEM 2020. [DOI: 10.1039/d0nj03540h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The origin of stereoselectivity in an isothiourea-catalyzed addition reaction of aryl ester with vinyl disulfone was explored for the first time.
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Affiliation(s)
- Congcong Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province
- Key Laboratory of Technology of Drug Preparation (Zhengzhou University)
- Ministry of Education of China
- Key Laboratory of Henan Province for Drug Quality and Evaluation, School of Pharmaceutical Sciences
- Zhengzhou University
| | - Shi-Jun Li
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Min Zhang
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Donghui Wei
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Lina Ding
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province
- Key Laboratory of Technology of Drug Preparation (Zhengzhou University)
- Ministry of Education of China
- Key Laboratory of Henan Province for Drug Quality and Evaluation, School of Pharmaceutical Sciences
- Zhengzhou University
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32
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Deng Q, Li SJ, Wei D, Lan Y. Insights into Lewis base-catalyzed chemoselective [3 + 2] and [3 + 4] annulation reactions of MBH carbonates. Org Chem Front 2020. [DOI: 10.1039/d0qo00457j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chemoselectivity of Lewis base-catalyzed [3 + 2] and [3 + 4] annulation reactions of MBH carbonates can be predicted using FMO overlap analysis.
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Affiliation(s)
- Qianqian Deng
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Shi-Jun Li
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Donghui Wei
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Yu Lan
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
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33
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Deng Q, Wang Y, Li SJ, Qu LB, Lan Y, Wei D. Origin and stabilization of axial chirality in the construction of naphthyl-C2-indoles: a DFT study. Org Chem Front 2020. [DOI: 10.1039/d0qo00936a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A novel method for predicting the stabilization of axial chirality in the construction of naphthyl-C2-indoles has been suggested for the first time.
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Affiliation(s)
- Qianqian Deng
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Yang Wang
- Department of Material and Chemical Engineering
- Zhengzhou University of Light Industry
- Zhengzhou 450002
- P.R. China
| | - Shi-Jun Li
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Ling-Bo Qu
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Yu Lan
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Donghui Wei
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
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34
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Wang C, Li SJ, Zhang QC, Wei D, Ding L. Insights into isothiourea-catalyzed asymmetric [3 + 3] annulation of α,β-unsaturated aryl esters with 2-acylbenzazoles: mechanism, origin of stereoselectivity and switchable chemoselectivity. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00295j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The switchable chemoselectivity of isothiourea-catalyzed asymmetric [3 + 3] annulation of α,β-unsaturated aryl esters with 2-acylbenzazoles has been predicted successfully.
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Affiliation(s)
- Congcong Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province
- Key Laboratory of Technology of Drug Preparation (Zhengzhou University)
- Ministry of Education of China
- Key Laboratory of Henan Province for Drug Quality and Evaluation
- School of Pharmaceutical Sciences
| | - Shi-Jun Li
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Qiao-Chu Zhang
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Donghui Wei
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Lina Ding
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province
- Key Laboratory of Technology of Drug Preparation (Zhengzhou University)
- Ministry of Education of China
- Key Laboratory of Henan Province for Drug Quality and Evaluation
- School of Pharmaceutical Sciences
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35
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Wang X, Wang Y, Song J, Wei D. Insights into N-heterocyclic carbene and Lewis acid cooperatively catalyzed oxidative [3 + 3] annulation reactions of α,β-unsaturated aldehyde with 1,3-dicarbonyl compounds. Org Chem Front 2020. [DOI: 10.1039/d0qo00091d] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
N-Heterocyclic carbene and Lewis acid cooperatively catalyzed oxidative [3 + 3] annulation reactions of 1,3-dicarbonyl compounds have been systematically studied in theory.
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Affiliation(s)
- Xinghua Wang
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Yang Wang
- Department of Material and Chemical Engineering
- Zhengzhou University of Light Industry
- Zhengzhou 450002
- P.R. China
| | - Jinshuai Song
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Donghui Wei
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
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36
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Shao Z, Huang C, Wu Q, Zhao Y, Xu W, Liu Y, Dang J, Hou H. Ion exchange collaborating coordination substitution: More efficient Cr(VI) removal performance of a water-stable Cu II-MOF material. JOURNAL OF HAZARDOUS MATERIALS 2019; 378:120719. [PMID: 31202075 DOI: 10.1016/j.jhazmat.2019.05.112] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 05/13/2019] [Accepted: 05/30/2019] [Indexed: 06/09/2023]
Abstract
An unusual water-stable cationic metal-organic framework {[Cu(L)0.5(bpe)(H2O)](NO3)•(H2O)0.5}n (1) (H4L = bis(3,5-dicarboxypyridinium)-p-xylylene) was synthesized, which was developed into an effective capture material for removal chromate from water. The results show that this material efficiently traps HCrO4- pollutant ions via single-crystal to single-crystal (SCSC) coordination substitution process. The HCrO4- uptake capacity of 1 is high to 190 mg/g. Meaningfully, the structure of 1-HCrO4 ({[Cu(L)0.5(bpe)(HCrO4)]}n) can be accurately obtained by single-crystal X-ray diffraction, where the chromate enter the framework to form stable coordination with central metal ions Cu2+. This is the first example of a stable coordination between chromate and the framework during the capture process. The captured HCrO4- are not dissociated easily into the solution due to the coordination bond. This interaction makes the enrichment of HCrO4- more stable and the capture capacity excellent. Furthermore, the HCrO4- releasing process displays good regeneration in a single crystal state, which further elaborates the reversible SCSC transformation. The mechanism of Cr(VI) removal was also confirmed by DFT calculation studies. This work provides a new way to design and develop efficient MOF capture materials.
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Affiliation(s)
- Zhichao Shao
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China
| | - Chao Huang
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China; Center for Advanced Materials Research, Zhongyuan University of Technology, Zhengzhou, 450007, Henan, PR China
| | - Qiong Wu
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China
| | - Yujie Zhao
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China
| | - Wenjuan Xu
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China
| | - Yeye Liu
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China
| | - Jian Dang
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China
| | - Hongwei Hou
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, PR China.
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37
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Controlled distribution of active centre to enhance catalytic activity of ordered Pd/Co catalytic nano-monolayer. J Catal 2019. [DOI: 10.1016/j.jcat.2019.07.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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38
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Wang X, Li Y, Chen X, Zhou Z, Yao J. Human Acetyl-CoA Carboxylase 1 Is an Isomerase: Carboxyl Transfer Is Activated by Catalytic Effect of Isomerization. J Phys Chem B 2019; 123:6757-6764. [PMID: 31306022 DOI: 10.1021/acs.jpcb.9b05384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Obesity and its related diseases such as cancer and diabetes are leading life-threatening issues in the modern world. Thus, new drugs toward obesity and obesity-caused diseases are highly desired. Human acetyl-CoA carboxylase 1 (hACC1) in charge of the rate-limiting step of the human fatty acid synthesis was recognized as an attractive target for rational drug design. The fundamental reaction mechanism and nature of the transition state of hACC1 remain unclear. In this study, combined quantum mechanics and molecular mechanics (QM/MM), molecular dynamics (MD), and free-energy simulations were performed to investigate the catalytic mechanism of the hACC1-catalyzed carboxyl-transfer reaction. Our computational results show a three-step mechanism for carboxyl transferase (CT)-catalyzed reaction, including isomerization of carboxybiotin, proton-transfer from acetyl-CoA to carboxybiotin, and carboxylation of acetyl-CoA enolate. Interestingly, isomerization of carboxybiotin is the rate-limiting step of the entire reaction pathway, indicating hACC1 has the catalytic effect of isomerization and thus might be an isomerase also. The activation free-energy barrier of carboxyl-transfer catalyzed by hACC1 was calculated to be 16.4 kcal/mol, in excellent agreement with the experimental result (16.7 kcal/mol). The obtained reaction mechanism together with the nature of the transition state provides helpful knowledge not only for future investigation of other ACCs but also for rational design of hACC1 inhibitors, such as TS analogue. The catalytic effect of hACC1 isomerization is discussed.
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Affiliation(s)
- Xia Wang
- School of Biological Science and Technology , University of Jinan , Jinan 250022 , China
| | - Yajing Li
- Department of Clinical Laboratory , The Second Hospital of Hebei Medical University , Shijiazhuang 050000 , China
| | - Xiabin Chen
- Holistic Integrative Pharmacy Institutes (HIPI), School of Medicine , Hangzhou Normal University , Hangzhou 311121 , China
| | - Ziyuan Zhou
- Department of Chemical Biology, School of Chemical Biology and Biotechnology , Shenzhen Graduate School of Peking University , Shenzhen 518055 , China
| | - Jianzhuang Yao
- School of Biological Science and Technology , University of Jinan , Jinan 250022 , China
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39
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Unravelling the Mechanism and Selectivity of the NHC‐catalyzed Three‐Membered Ring‐Opening/Fluorination of Epoxy Enals: A DFT Study. ChemCatChem 2019. [DOI: 10.1002/cctc.201900424] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Liu Q, Sun L, Li S, Li X, Qu L, Lan Y, Wei D. Insights into N‐Heterocyclic Carbene (NHC)‐Catalyzed Asymmetric Addition of 2H‐Azirine with Aldehyde. Chem Asian J 2019; 14:2000-2007. [DOI: 10.1002/asia.201900076] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/14/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Qiuli Liu
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Ling Sun
- Basic Teaching DepartmentHuanghe Jiaotong University No. 333 Yingbin Road Wuzhi Henan 454950 P. R. China
| | - Shi‐Jun Li
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Xue Li
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Ling‐Bo Qu
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Yu Lan
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Donghui Wei
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
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41
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Li X, Duan R, Wang Y, Qu LB, Li Z, Wei D. Insights into N-Heterocyclic Carbene-Catalyzed Oxidative α-C(sp 3)-H Activation of Aliphatic Aldehydes and Cascade [2 + 2] Cycloaddition with Ketimines. J Org Chem 2019; 84:6117-6125. [PMID: 31012584 DOI: 10.1021/acs.joc.9b00295] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Predicting the chemoselectivity of [2 + 2] cyclizations is an important challenge in organic chemistry. Herein, we provided a valuable case for this issue. Density functional theory calculations were performed to systematically study the possible mechanisms and origin of selectivities for the N-heterocyclic carbene (NHC)-catalyzed oxidative α-C(sp3)-H activation of aliphatic aldehydes and the cascade [2 + 2] cycloaddition with ketimines. The [2 + 2] cycloaddition of azolium enolate intermediates to the C═N bond, rather than the C═O bond of ketimine, is revealed to be determined by chemo- and stereoselectivity. By comparing the energy gap between the frontier molecular orbitals (FMOs) of the two reacting parts involved in the [2 + 2] cycloaddition transition states, we propose a new strategy to determine the origin of the reaction chemoselectivity. Moreover, the local nucleophilic index can efficiently predict the active site of ketimines. Further analyses illustrate that NHC can increase the nucleophilicity of aldehydes and the acidity of the α-C(sp3)-H bond, and 3,3',5,5'-tetra- tert-butyl diphenoquinone (DQ) acts as an oxidant and promotes α-C(sp3)-H bond deprotonation. This work is useful not only for understanding the NHC-catalyzed oxidative [2 + 2] annulation but also for developing new applications of the FMO theory in organocatalytic cyclizations.
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Affiliation(s)
- Xue Li
- The College of Chemistry and Molecular Engineering , Zhengzhou University , 100 Science Avenue , Zhengzhou , Henan 450001 , P. R. China
| | - Ruihong Duan
- The College of Chemistry and Molecular Engineering , Zhengzhou University , 100 Science Avenue , Zhengzhou , Henan 450001 , P. R. China
| | - Yanyan Wang
- The College of Chemistry and Molecular Engineering , Zhengzhou University , 100 Science Avenue , Zhengzhou , Henan 450001 , P. R. China
| | - Ling-Bo Qu
- The College of Chemistry and Molecular Engineering , Zhengzhou University , 100 Science Avenue , Zhengzhou , Henan 450001 , P. R. China
| | - Zhongjun Li
- The College of Chemistry and Molecular Engineering , Zhengzhou University , 100 Science Avenue , Zhengzhou , Henan 450001 , P. R. China
| | - Donghui Wei
- The College of Chemistry and Molecular Engineering , Zhengzhou University , 100 Science Avenue , Zhengzhou , Henan 450001 , P. R. China
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42
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Kannappan B, Cummins PL, Gready JE. Mechanism of Oxygenase-Pathway Reactions Catalyzed by Rubisco from Large-Scale Kohn-Sham Density Functional Calculations. J Phys Chem B 2019; 123:2833-2843. [PMID: 30845802 DOI: 10.1021/acs.jpcb.9b00518] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ribulose 1,5-bisphosphate carboxylase-oxygenase (Rubisco) is the primary carbon-fixing enzyme in photosynthesis, fixing CO2 to a 5-carbon sugar, RuBP, in a series of five reactions. However, it also catalyzes an oxygenase reaction by O2 addition to the same enolized RuBP substrate in an analogous reaction series in the same active site, producing a waste product and loss of photosynthetic efficiency. Starting from RuBP, the reactions are enolization to the enediolate form, addition of CO2 or O2 to form the carboxy or peroxo adduct, hydration to form a gemdiolate, scission of the C2-C3 bond of the original RuBP, and stereospecific or nonstereospecific protonation to form two molecules of the 3-carbon PGA product, or one molecule of PGA, one of 2-carbon PG (waste product), and one water molecule. Reducing the loss of efficiency from the oxygenase reaction is an attractive means to increase crop productivity. However, lack of understanding of key aspects of the catalytic mechanisms for both the carboxylase and oxygenase reactions, particularly those involving proton exchanges and roles of water molecules, has stymied efforts at re-engineering Rubisco to reduce losses from the oxygenation reaction. As the stable form of molecular oxygen is the triplet biradical state (3O2), its reaction with near-universal singlet-state molecules is formally spin forbidden. Although in oxygenase enzymes, 3O2 activation is usually achieved by one-electron transfers using transition-metal ions or organic cofactors, recently, cofactor-less oxygenases in which the substrate itself is the source of the electron for 3O2 activation have been identified, but in all such cases an aromatic ring stabilizes the substrate's negative charge. Here we present the first large-scale Kohn-Sham density functional theory study of the reaction mechanism of the Rubisco oxygenase pathway. First, we show that the enediolate substrate complexed to Mg2+ and its ligands extends the region for charge delocalization and stabilization of its negative charge to allow formation of a caged biradical enediolate-O2 complex. Thus, Rubisco is a unique type of oxygenase without precedent in the literature. Second, for the O2 addition to proceed to the singlet peroxo-adduct intermediate, the system must undergo an intersystem crossing. We found that the presence of protonated LYS334 is required to stabilize this intermediate and that both factors (strongly stabilized anion and protonated LYS334) facilitate a barrier-less activation of 3O2. This finding supports our recent proposal that deoxygenation, that is, reversal of gas binding, is possible. Third, as neither CO2 nor O2 binds to the enzyme, our findings support the proposal from our recent carboxylase study that the observed KC or KO (Michaelis-Menten constants) in the steady-state kinetics reflect the respective adducts, carboxy or peroxo. Fourth, after computing hydration pathways with water addition both syn and anti to C3, we found, in contrast to the results of our carboxylation study indicating anti addition, that in the oxygenation reaction only syn-hydration is capable of producing a stable gemdiolate that facilitates the rate-limiting C2-C3 bond scission to final products. Fifth, we propose that an excess proton we previously found was required in the carboxylation reaction for activating the C2-C3 bond scission is utilized in the oxygenation reaction for the required elimination of a water molecule. In summary, despite its oxygenase handicap, Rubisco's success in directing 75% of its substrate through the carboxylation pathway can be considered impressively effective. Although native C3 Rubiscos are in a fix with unwanted activity of 3O2 hampering its primary carboxylase function, mechanistic differences presented here with findings in our recent carboxylase study for both the gas-addition and subsequent reactions provide some clues as to how creative Rubisco re-engineering may offer a solution to reducing the oxygenase activity.
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Affiliation(s)
- Babu Kannappan
- John Curtin School of Medical Research , The Australian National University , Canberra ACT 0200 , Australia
| | - Peter L Cummins
- John Curtin School of Medical Research , The Australian National University , Canberra ACT 0200 , Australia
| | - Jill E Gready
- John Curtin School of Medical Research , The Australian National University , Canberra ACT 0200 , Australia
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43
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Wang X, Bakanina Kissanga GM, Li E, Li Q, Yao J. The catalytic mechanism of S-acyltransferases: acylation is triggered on by a loose transition state and deacylation is turned off by a tight transition state. Phys Chem Chem Phys 2019; 21:12163-12172. [DOI: 10.1039/c9cp02248a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of S-acyltransferase is characterized by a loose transition state.
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Affiliation(s)
- Xia Wang
- School of Biological Science and Technology
- University of Jinan
- Jinan 250022
- China
| | | | - E. Li
- School of Biological Science and Technology
- University of Jinan
- Jinan 250022
- China
| | - Qiang Li
- School of Biological Science and Technology
- University of Jinan
- Jinan 250022
- China
| | - Jianzhuang Yao
- School of Biological Science and Technology
- University of Jinan
- Jinan 250022
- China
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44
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Zhang QC, Li X, Wang X, Li SJ, Qu LB, Lan Y, Wei D. Insights into highly selective ring expansion of oxaziridines under Lewis base catalysis: a DFT study. Org Chem Front 2019. [DOI: 10.1039/c8qo01370e] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The possible mechanism and stereoselectivity of the NHC-catalyzed ring expansion reaction of oxaziridines have been theoretically studied for the first time.
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Affiliation(s)
- Qiao-Chu Zhang
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Xue Li
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Xinghua Wang
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Shi-Jun Li
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Ling-Bo Qu
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Yu Lan
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
- School of Chemistry and Chemical Engineering
| | - Donghui Wei
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
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45
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Gao J, Wang Y. Mechanistic studies on the N-heterocyclic carbene-catalyzed reaction of isatin-derived enals with hydrazones. Org Biomol Chem 2019; 17:7442-7447. [DOI: 10.1039/c9ob01317b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The detailed mechanism and origin of stereoselectivity of the NHC-catalyzed annulation reaction were investigated.
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Affiliation(s)
- Jinxin Gao
- Department of Cooking Food
- Henan Polytechnic
- Zhengzhou
- P. R. China
| | - Yang Wang
- Department of Material and Chemical Engineering
- Zhengzhou University of Light Industry
- Zhengzhou
- P. R. China
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46
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Zhao M, Xiao Y, Qiao Y. Mechanistic insights and origin of chemoselectivity for S–O bond cleavage in dinitrobenzenesulfonic carbamates. NEW J CHEM 2019. [DOI: 10.1039/c9nj03770e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A computational study on the NHC-catalyzed chemoselective S–O bond cleavage in dinitrobenzenesulfonic carbamates.
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Affiliation(s)
- Miao Zhao
- Department of Pathophysiology
- School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- China
| | - Yang Xiao
- Department of Pathophysiology
- School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- China
| | - Yan Qiao
- Department of Pathophysiology
- School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- China
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47
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Shi Q, Wang W, Wang Y, Lan Y, Yao C, Wei D. Prediction on the origin of chemoselectivity in Lewis base-mediated competition cyclizations between allenoates and chalcones: a computational study. Org Chem Front 2019. [DOI: 10.1039/c9qo00606k] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The HOMOTSs and p-orbital contributions of the center atoms were used to predict the origin of chemoselectivity in this work.
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Affiliation(s)
- Qianqian Shi
- College of Chemistry and Molecular Engineering
- and School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Wei Wang
- College of Chemistry and Molecular Engineering
- and School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Yang Wang
- Department of Material and Chemical Engineering
- Zhengzhou University of Light Industry
- Zhengzhou
- P. R. China
| | - Yu Lan
- College of Chemistry and Molecular Engineering
- and School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Changsheng Yao
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials
- School of Chemistry & Materials Science
- Jiangsu Normal University
- Xuzhou
- P. R. China
| | - Donghui Wei
- College of Chemistry and Molecular Engineering
- and School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- P. R. China
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48
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Li X, Li SJ, Wang Y, Wang Y, Qu LB, Li Z, Wei D. Insights into NHC-catalyzed oxidative α-C(sp3)–H activation of aliphatic aldehydes and cascade [2 + 3] cycloaddition with azomethine imines. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00526a] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The NHC catalyst is identified to promote [2 + 3] cycloaddition by avoiding the poor FMO overlap mode in theory.
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Affiliation(s)
- Xue Li
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Shi-Jun Li
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Yanyan Wang
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Yang Wang
- Department of Material and Chemical Engineering
- Zhengzhou University of Light Industry
- Zhengzhou
- P.R. China
| | - Ling-Bo Qu
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Zhongjun Li
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Donghui Wei
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P.R. China
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49
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Wang Y, Qu L, Wei D. Prediction on the Origin of Selectivities in Base‐controlled Switchable NHC‐catalyzed Transformations. Chem Asian J 2018; 14:293-300. [DOI: 10.1002/asia.201801583] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2018] [Revised: 11/28/2018] [Indexed: 12/26/2022]
Affiliation(s)
- Yang Wang
- Department of Material and Chemical EngineeringZhengzhou University of Light Industry 136 Science Avenue Zhengzhou Henan Province 450002 P. R. China
| | - Ling‐Bo Qu
- College of Chemistry and Molecular EngineeringZhengzhou University 100 Science Avenue Zhengzhou Henan Province 450002 P. R. China
| | - Donghui Wei
- College of Chemistry and Molecular EngineeringZhengzhou University 100 Science Avenue Zhengzhou Henan Province 450002 P. R. China
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50
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Xiao Y, Zhang X, Zhao J, Qiao Y. Mechanisms and regioselectivities of DABCO/DMAP‐catalyzed [2+4] annulation reactions of allenoate with α,β‐unsaturated cyclic ketimine: A DFT study. J PHYS ORG CHEM 2018. [DOI: 10.1002/poc.3914] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Yang Xiao
- Department of Pathophysiology, School of Basic Medical SciencesZhengzhou University Zhengzhou China
| | - Xiao‐Yan Zhang
- Department of Pathophysiology, School of Basic Medical SciencesZhengzhou University Zhengzhou China
| | - Ji‐Min Zhao
- Department of Pathophysiology, School of Basic Medical SciencesZhengzhou University Zhengzhou China
| | - Yan Qiao
- Department of Pathophysiology, School of Basic Medical SciencesZhengzhou University Zhengzhou China
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