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Microwell Fluoride Screen for Chemical, Enzymatic, and Cellular Reactions Reveals Latent Microbial Defluorination Capacity for -CF 3 Groups. Appl Environ Microbiol 2022; 88:e0028822. [PMID: 35435713 DOI: 10.1128/aem.00288-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The capacity to defluorinate polyfluorinated organic compounds is a rare phenotype in microbes but is increasingly considered important for maintaining the environment. New discoveries will be greatly facilitated by the ability to screen many natural and engineered microbes in a combinatorial manner against large numbers of fluorinated compounds simultaneously. Here, we describe a low-volume, high-throughput screening method to determine defluorination capacity of microbes and their enzymes. The method is based on selective binding of fluoride to a lanthanum chelate complex that gives a purple-colored product. It was miniaturized to determine biodefluorination in 96-well microtiter plates by visual inspection or robotic handling and spectrophotometry. Chemicals commonly used in microbiological studies were examined to define usable buffers and reagents. Base-catalyzed, purified enzyme and whole-cell defluorination reactions were demonstrated with fluoroatrazine and showed correspondence between the microtiter assay and a fluoride electrode. For discovering new defluorination reactions and mechanisms, a chemical library of 63 fluorinated compounds was screened in vivo with Pseudomonas putida F1 in microtiter well plates. These data were also calibrated against a fluoride electrode. Our new method revealed 21 new compounds undergoing defluorination. A compound with four fluorine substituents, 4-fluorobenzotrifluoride, was shown to undergo defluorination to the greatest extent. The mechanism of its defluorination was studied to reveal a latent microbial propensity to defluorinate trifluoromethylphenyl groups, a moiety that is commonly incorporated into numerous pharmaceutical and agricultural chemicals. IMPORTANCE Thousands of organofluorine chemicals are known, and a number are considered to be persistent and toxic environmental pollutants. Environmental bioremediation methods are avidly being sought, but few bacteria biodegrade fluorinated chemicals. To find new organofluoride biodegradation, a rapid screening method was developed. The method is versatile, monitoring chemical, enzymatic, and whole-cell biodegradation. Biodegradation of organofluorine compounds invariably releases fluoride anions, which was sensitively detected. Our method uncovered 21 new microbial defluorination reactions. A general mechanism was delineated for the biodegradation of trifluoromethylphenyl groups that are increasingly being used in drugs and pesticides.
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Sovera V, Martínez S, Umpiérrez D, Vila MA, Gonzalez D, Seoane G, Veiga N, Carrera I. Synthesis of Azido‐Dienediols by Enzymatic Dioxygenation of Benzylazides: An Experimental and Theoretical Study. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Victoria Sovera
- Laboratorio de Síntesis Orgánica Departamento de Química Orgánica Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
| | - Sebastián Martínez
- Área Química Inorgánica Departamento Estrella Campos Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
| | - Diego Umpiérrez
- Laboratorio de Síntesis Orgánica Departamento de Química Orgánica Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
- Laboratorio de Biocatálisis y Biotransformaciones Departamento de Química Orgánica Departamento de Biociencias Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
| | - María Agustina Vila
- Laboratorio de Síntesis Orgánica Departamento de Química Orgánica Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
- Laboratorio de Biocatálisis y Biotransformaciones Departamento de Química Orgánica Departamento de Biociencias Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
| | - David Gonzalez
- Laboratorio de Síntesis Orgánica Departamento de Química Orgánica Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
- Laboratorio de Biocatálisis y Biotransformaciones Departamento de Química Orgánica Departamento de Biociencias Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
| | - Gustavo Seoane
- Laboratorio de Síntesis Orgánica Departamento de Química Orgánica Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
- Laboratorio de Biocatálisis y Biotransformaciones Departamento de Química Orgánica Departamento de Biociencias Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
| | - Nicolás Veiga
- Área Química Inorgánica Departamento Estrella Campos Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
| | - Ignacio Carrera
- Laboratorio de Síntesis Orgánica Departamento de Química Orgánica Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
- Laboratorio de Biocatálisis y Biotransformaciones Departamento de Química Orgánica Departamento de Biociencias Facultad de Química Universidad de la República (UdelaR) Av. Gral. Flores 2124 Montevideo Uruguay
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Xu A, Zhang X, Wu S, Xu N, Huang Y, Yan X, Zhou J, Cui Z, Dong W. Pollutant Degrading Enzyme: Catalytic Mechanisms and Their Expanded Applications. Molecules 2021; 26:4751. [PMID: 34443339 PMCID: PMC8401168 DOI: 10.3390/molecules26164751] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 07/03/2021] [Accepted: 07/30/2021] [Indexed: 11/16/2022] Open
Abstract
The treatment of environmental pollution by microorganisms and their enzymes is an innovative and socially acceptable alternative to traditional remediation approaches. Microbial biodegradation is often characterized with high efficiency as this process is catalyzed via degrading enzymes. Various naturally isolated microorganisms were demonstrated to have considerable ability to mitigate many environmental pollutants without external intervention. However, only a small fraction of these strains are studied in detail to reveal the mechanisms at the enzyme level, which strictly limited the enhancement of the degradation efficiency. Accordingly, this review will comprehensively summarize the function of various degrading enzymes with an emphasis on catalytic mechanisms. We also inspect the expanded applications of these pollutant-degrading enzymes in industrial processes. An in-depth understanding of the catalytic mechanism of enzymes will be beneficial for exploring and exploiting more degrading enzyme resources and thus ameliorate concerns associated with the ineffective biodegradation of recalcitrant and xenobiotic contaminants with the help of gene-editing technology and synthetic biology.
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Affiliation(s)
- Anming Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, China; (A.X.); (X.Z.); (S.W.); (N.X.); (J.Z.)
| | - Xiaoxiao Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, China; (A.X.); (X.Z.); (S.W.); (N.X.); (J.Z.)
| | - Shilei Wu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, China; (A.X.); (X.Z.); (S.W.); (N.X.); (J.Z.)
| | - Ning Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, China; (A.X.); (X.Z.); (S.W.); (N.X.); (J.Z.)
| | - Yan Huang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China; (Y.H.); (X.Y.)
| | - Xin Yan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China; (Y.H.); (X.Y.)
| | - Jie Zhou
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, China; (A.X.); (X.Z.); (S.W.); (N.X.); (J.Z.)
| | - Zhongli Cui
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China; (Y.H.); (X.Y.)
| | - Weiliang Dong
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, China; (A.X.); (X.Z.); (S.W.); (N.X.); (J.Z.)
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Boyd DR, Sharma ND, Goodrich PA, Malone JF, McConville G, Harrison JS, Stevenson PJ, Allen CCR. Enantiopurity and absolute configuration determination of arene cis-dihydrodiol metabolites and derivatives using chiral boronic acids. Chirality 2017; 30:5-18. [PMID: 29024058 DOI: 10.1002/chir.22764] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 07/19/2017] [Accepted: 07/24/2017] [Indexed: 02/03/2023]
Abstract
The relative merits of the methods employed to determine enantiomeric excess (ee) values and absolute configurations of chiral arene and alkene cis-1,2-diol metabolites, including boronate formation, using racemic or enantiopure (+) and (-)-2-(1-methoxyethyl)phenylboronic acid (MEPBA), are discussed. Further applications of: 1) MEPBA derived boronates of chiral mono- and poly-cyclic arene cis-dihydrodiol, cyclohex-2-en-1-one cis-diol, heteroarene cis/trans-2,3-diol, and catechol metabolites in estimating their ee values, and 2) new chiral phenylboronic acids, 2-[1-methoxy-2,2-dimethylpropyl]phenyl boronic acid (MDPBA) and 2-[1-methoxy-1-phenylmethyl]phenyl boronic acid (MPPBA) and their advantages over MEPBA, as reagents for stereochemical analysis of arene and alkene cis-diol metabolites, are presented.
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Affiliation(s)
- Derek R Boyd
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Narain D Sharma
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Peter A Goodrich
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - John F Malone
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Gareth McConville
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - John S Harrison
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Paul J Stevenson
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Christopher C R Allen
- School of Biological Sciences and Institute for Global and Food Security, Queen's University, Belfast, UK
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Vila MA, Umpiérrez D, Veiga N, Seoane G, Carrera I, Rodríguez Giordano S. Site-Directed Mutagenesis Studies on the Toluene Dioxygenase Enzymatic System: Role of Phenylalanine 366, Threonine 365 and Isoleucine 324 in the Chemo-, Regio-, and Stereoselectivity. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700444] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- María Agustina Vila
- Laboratorio de Biocatálisis y Biotransformaciones; Departamento de Química Orgánica-Departamento de Biociencias; Facultad de Química; Universidad de la República; Montevideo Uruguay
| | - Diego Umpiérrez
- Laboratorio de Biocatálisis y Biotransformaciones; Departamento de Química Orgánica-Departamento de Biociencias; Facultad de Química; Universidad de la República; Montevideo Uruguay
| | - Nicolás Veiga
- Química Inorgánica, Departamento Estrella Campos; Facultad de Química; Universidad de la República; Montevideo Uruguay
| | - Gustavo Seoane
- Laboratorio de Biocatálisis y Biotransformaciones; Departamento de Química Orgánica-Departamento de Biociencias; Facultad de Química; Universidad de la República; Montevideo Uruguay
| | - Ignacio Carrera
- Laboratorio de Biocatálisis y Biotransformaciones; Departamento de Química Orgánica-Departamento de Biociencias; Facultad de Química; Universidad de la República; Montevideo Uruguay
| | - Sonia Rodríguez Giordano
- Laboratorio de Biocatálisis y Biotransformaciones; Departamento de Química Orgánica-Departamento de Biociencias; Facultad de Química; Universidad de la República; Montevideo Uruguay
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Poureskandari M, Safaei E, Maryam Sajjadi S, Karimpour T, Jaglicic Z, Lee YI. Iron(III) complex of N-phenylethylenediamine derivative of amine bis(phenol) ligand as model for catechol dioxygenase: Synthesis, characterization and complexation studies. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.04.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chiral Derivatizing Agents, Macrocycles, Metal Complexes, and Liquid Crystals for Enantiomer Differentiation in NMR Spectroscopy. Top Curr Chem (Cham) 2013; 341:1-68. [DOI: 10.1007/128_2013_433] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Boyd DR, Sharma ND, Malone JF, McIntyre PBA, Stevenson PJ, Allen CCR, Kwit M, Gawronski J. Structure, stereochemistry and synthesis of enantiopure cyclohexenone cis-diol bacterial metabolites derived from phenols. Org Biomol Chem 2012; 10:6217-29. [DOI: 10.1039/c2ob25079a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hall M, Bommarius AS. Enantioenriched Compounds via Enzyme-Catalyzed Redox Reactions. Chem Rev 2011; 111:4088-110. [DOI: 10.1021/cr200013n] [Citation(s) in RCA: 173] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mélanie Hall
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 315 Ferst Drive, Atlanta, Georgia 30332, United States
- Department of Chemistry, Organic and Bioorganic Chemistry, University of Graz, 8010 Graz, Austria
| | - Andreas S. Bommarius
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 315 Ferst Drive, Atlanta, Georgia 30332, United States
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García-Urdiales E, Alfonso I, Gotor V. Update 1 of: Enantioselective Enzymatic Desymmetrizations in Organic Synthesis. Chem Rev 2011; 111:PR110-80. [DOI: 10.1021/cr100330u] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eduardo García-Urdiales
- Departamento de Química
Orgánica e Inorgánica, Facultad de Química, Universidad
de Oviedo, Julián Clavería, 8, 33006 Oviedo, Spain,
and
| | - Ignacio Alfonso
- Departamento de Química Biológica
y Modelización Molecular, Instituto de Química Avanzada
de Cataluña (IQAC, CSIC), Jordi Girona, 18-26, 08034, Barcelona,
Spain
| | - Vicente Gotor
- Departamento de Química
Orgánica e Inorgánica, Facultad de Química, Universidad
de Oviedo, Julián Clavería, 8, 33006 Oviedo, Spain,
and
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Boyd DR, Sharma ND, Stevenson PJ, Blain M, McRoberts C, Hamilton JTG, Argudo JM, Mundi H, Kulakov LA, Allen CCR. Dioxygenase-catalysed cis-dihydroxylation of meta-substituted phenols to yield cyclohexenone cis-diol and derived enantiopure cis-triol metabolites. Org Biomol Chem 2011; 9:1479-90. [PMID: 21221457 DOI: 10.1039/c0ob00894j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
cis-Dihydroxylation of meta-substituted phenol (m-phenol) substrates, to yield the corresponding cyclohexenone cis-diol metabolites, was catalysed by arene dioxygenases present in mutant and recombinant bacterial strains. The presence of cyclohexenone cis-diol metabolites and several of their cyclohexene and cyclohexane cis-triol derivatives was detected by LC-TOFMS analysis and confirmed by NMR spectroscopy. Structural and stereochemical analyses of chiral ketodiol bioproducts, was carried out using NMR and CD spectroscopy and stereochemical correlation methods. The formation of enantiopure cyclohexenone cis-diol metabolites is discussed in the context of postulated binding interactions of the m-phenol substrates at the active site of toluene dioxygenase (TDO).
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Affiliation(s)
- Derek R Boyd
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, UK BT9 5AG.
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Pescitelli G, Kurtán T, Flörke U, Krohn K. Absolute structural elucidation of natural products--a focus on quantum-mechanical calculations of solid-state CD spectra. Chirality 2010; 21 Suppl 1:E181-201. [PMID: 19902530 DOI: 10.1002/chir.20795] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this review article we examine state-of-the-art techniques for the structural elucidation of organic compounds isolated from natural sources. In particular, we focus on the determination of absolute configuration (AC), perhaps the most challenging but inevitable step in the whole process, especially when newly isolated compounds are screened for biological activity. Among the many methods employed for AC assignment that we review, special attention is paid to electronic circular dichroism (CD) and to the modern tools available for quantum-mechanics CD predictions, including TDDFT. In this context, we stress that conformational flexibility often poses a limit to practical CD calculations of solution CD spectra. Many crystalline natural products suitable for X-ray analysis do not contain heavy atoms for a confidential AC assignment by resonant scattering. However, their CD spectra can be recorded in the solid state, for example with the KCl pellet technique, and analyzed possibly by nonempirical means to provide stereochemical information. In particular, solid-state CD spectra can be compared with those calculated with TDDFT or other high-level methods, using the X-ray geometry as input. The solid-state CD/TDDFT approach, described in detail, represents a quick and reliable tool for AC assignment of natural products.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, Pisa, Italy.
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Kwit M, Gawronski J, Boyd DR, Sharma ND, Kaik M. Circular dichroism, optical rotation and absolute configuration of 2-cyclohexenone-cis-diol type phenol metabolites: redefining the role of substituents and 2-cyclohexenone conformation in electronic circular dichroism spectra. Org Biomol Chem 2010; 8:5635-45. [DOI: 10.1039/c0ob00422g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Boyd DR, Sharma ND, Malone JF, Allen CCR. New families of enantiopure cyclohexenone cis-diol, o-quinol dimer and hydrate metabolites from dioxygenase-catalysed dihydroxylation of phenols. Chem Commun (Camb) 2009:3633-5. [DOI: 10.1039/b905940g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Fabris F, Collins J, Sullivan B, Leisch H, Hudlicky T. Investigation of steric and functionality limits in the enzymatic dihydroxylation of benzoate esters. Versatile intermediates for the synthesis of pseudo-sugars, amino cyclitols, and bicyclic ring systems. Org Biomol Chem 2009; 7:2619-27. [DOI: 10.1039/b902577b] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kwit M, Gawronski J, Boyd D, Sharma N, Kaik M, More O'Ferrall R, Kudavalli J. Toluene Dioxygenase-Catalyzed Synthesis of cis-Dihydrodiol Metabolites from 2-Substituted Naphthalene Substrates: Assignments of Absolute Configurations and Conformations from Circular Dichroism and Optical Rotation Measurements. Chemistry 2008; 14:11500-11. [DOI: 10.1002/chem.200801686] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nolan LC, O'Connor KE. Dioxygenase- and monooxygenase-catalysed synthesis of cis-dihydrodiols, catechols, epoxides and other oxygenated products. Biotechnol Lett 2008; 30:1879-91. [PMID: 18612597 DOI: 10.1007/s10529-008-9791-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Revised: 06/20/2008] [Accepted: 06/24/2008] [Indexed: 11/29/2022]
Affiliation(s)
- Louise C Nolan
- School of Biomolecular and Biomedical Science, Centre for Synthesis and Chemical Biology, Conway Institute for Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
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Kwit M, Sharma ND, Boyd DR, Gawronski J. Determination of absolute configuration of conformationally flexiblecis-dihydrodiol metabolites: Effect of diene substitution pattern on the circular dichroism spectra and optical rotations. Chirality 2008; 20:609-20. [DOI: 10.1002/chir.20471] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Boyd DR, Sharma ND, Coen GP, Hempenstall F, Ljubez V, Malone JF, Allen CCR, Hamilton JTG. Regioselectivity and stereoselectivity of dioxygenase catalysed cis-dihydroxylation of mono- and tri-cyclic azaarene substrates. Org Biomol Chem 2008; 6:3957-66. [DOI: 10.1039/b810235j] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Boyd DR, Sharma ND, Sbircea L, Murphy D, Belhocine T, Malone JF, James SL, Allen CCR, Hamilton JTG. Azaarene cis-dihydrodiol-derived 2,2′-bipyridine ligands for asymmetric allylic oxidation and cyclopropanation. Chem Commun (Camb) 2008:5535-7. [DOI: 10.1039/b814678k] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Kwit M, Sharma ND, Boyd DR, Gawronski J. Absolute Configuration of Conformationally Flexiblecis-Dihydrodiol Metabolites by the Method of Confrontation of Experimental and Calculated Electronic CD Spectra and Optical Rotations. Chemistry 2007; 13:5812-21. [PMID: 17397025 DOI: 10.1002/chem.200601851] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We have determined the absolute configurations of conformationally flexible cis-dihydrodiol metabolites (cis-1,2-dihydroxy-3,5-cyclohexadienes), bearing different substituents (e.g., Br, F, CF3, CN, Me) in 3- and 5-positions, by the method of confrontation of experimental and calculated electronic CD spectra and optical rotations. Convergent results were obtained by both methods in eight out of ten cases. For the difficult cases, where either conformer population and/or chiroptical properties (calculated rotational strengths of the long-wavelength Cotton effect or optical rotations) of contributing conformers remain inconclusive, the absolute configuration could still be correctly assigned based on one of the biased properties (either ECD or optical rotation). This approach appears well-suited for a broad spectrum of conformationally flexible chiral molecules.
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Affiliation(s)
- Marcin Kwit
- Department of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland
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