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Flavin-enabled reductive and oxidative epoxide ring opening reactions. Nat Commun 2022; 13:4896. [PMID: 35986005 PMCID: PMC9391479 DOI: 10.1038/s41467-022-32641-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 08/08/2022] [Indexed: 12/23/2022] Open
Abstract
Epoxide ring opening reactions are common and important in both biological processes and synthetic applications and can be catalyzed in a non-redox manner by epoxide hydrolases or reductively by oxidoreductases. Here we report that fluostatins (FSTs), a family of atypical angucyclines with a benzofluorene core, can undergo nonenzyme-catalyzed epoxide ring opening reactions in the presence of flavin adenine dinucleotide (FAD) and nicotinamide adenine dinucleotide (NADH). The 2,3-epoxide ring in FST C is shown to open reductively via a putative enol intermediate, or oxidatively via a peroxylated intermediate with molecular oxygen as the oxidant. These reactions lead to multiple products with different redox states that possess a single hydroxyl group at C-2, a 2,3-vicinal diol, a contracted five-membered A-ring, or an expanded seven-membered A-ring. Similar reactions also take place in both natural products and other organic compounds harboring an epoxide adjacent to a carbonyl group that is conjugated to an aromatic moiety. Our findings extend the repertoire of known flavin chemistry that may provide new and useful tools for organic synthesis. Epoxide ring opening reactions are important in both biological processes and synthetic applications. Here, the authors show that flavin cofactors can catalyze reductive and oxidative epoxide ring opening reactions and propose the underlying mechanisms.
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Payer SE, Marshall SA, Bärland N, Sheng X, Reiter T, Dordic A, Steinkellner G, Wuensch C, Kaltwasser S, Fisher K, Rigby SEJ, Macheroux P, Vonck J, Gruber K, Faber K, Himo F, Leys D, Pavkov‐Keller T, Glueck SM. Regioselective para-Carboxylation of Catechols with a Prenylated Flavin Dependent Decarboxylase. Angew Chem Int Ed Engl 2017; 56:13893-13897. [PMID: 28857436 PMCID: PMC5656893 DOI: 10.1002/anie.201708091] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Indexed: 11/18/2022]
Abstract
The utilization of CO2 as a carbon source for organic synthesis meets the urgent demand for more sustainability in the production of chemicals. Herein, we report on the enzyme-catalyzed para-carboxylation of catechols, employing 3,4-dihydroxybenzoic acid decarboxylases (AroY) that belong to the UbiD enzyme family. Crystal structures and accompanying solution data confirmed that AroY utilizes the recently discovered prenylated FMN (prFMN) cofactor, and requires oxidative maturation to form the catalytically competent prFMNiminium species. This study reports on the in vitro reconstitution and activation of a prFMN-dependent enzyme that is capable of directly carboxylating aromatic catechol substrates under ambient conditions. A reaction mechanism for the reversible decarboxylation involving an intermediate with a single covalent bond between a quinoid adduct and cofactor is proposed, which is distinct from the mechanism of prFMN-associated 1,3-dipolar cycloadditions in related enzymes.
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Affiliation(s)
- Stefan E. Payer
- Department of Chemistry, Organic & Bioorganic ChemistryUniversity of Graz, NAWI Graz, BioTechMed GrazHeinrichstrasse 28/28010GrazAustria
| | - Stephen A. Marshall
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterM1 7DNUK
| | - Natalie Bärland
- Max Planck Institute of BiophysicsMax-von-Laue Strasse 360438Frankfurt am MainGermany
| | - Xiang Sheng
- Department of Organic ChemistryArrhenius LaboratoryStockholm University10691StockholmSweden
| | - Tamara Reiter
- Austrian Centre of Industrial Biotechnology (ACIB)Austria
| | - Andela Dordic
- Institute of Molecular BiosciencesUniversity of Graz, NAWI Graz, BioTechMed GrazHumboldtstrasse 508010GrazAustria
- Austrian Centre of Industrial Biotechnology (ACIB)Austria
| | - Georg Steinkellner
- Institute of Molecular BiosciencesUniversity of Graz, NAWI Graz, BioTechMed GrazHumboldtstrasse 508010GrazAustria
- Austrian Centre of Industrial Biotechnology (ACIB)Austria
| | | | - Susann Kaltwasser
- Max Planck Institute of BiophysicsMax-von-Laue Strasse 360438Frankfurt am MainGermany
| | - Karl Fisher
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterM1 7DNUK
| | - Stephen E. J. Rigby
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterM1 7DNUK
| | - Peter Macheroux
- Institute of BiochemistryGraz University of TechnologyPetersgasse 128010GrazAustria
| | - Janet Vonck
- Max Planck Institute of BiophysicsMax-von-Laue Strasse 360438Frankfurt am MainGermany
| | - Karl Gruber
- Institute of Molecular BiosciencesUniversity of Graz, NAWI Graz, BioTechMed GrazHumboldtstrasse 508010GrazAustria
| | - Kurt Faber
- Department of Chemistry, Organic & Bioorganic ChemistryUniversity of Graz, NAWI Graz, BioTechMed GrazHeinrichstrasse 28/28010GrazAustria
| | - Fahmi Himo
- Department of Organic ChemistryArrhenius LaboratoryStockholm University10691StockholmSweden
| | - David Leys
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterM1 7DNUK
| | - Tea Pavkov‐Keller
- Institute of Molecular BiosciencesUniversity of Graz, NAWI Graz, BioTechMed GrazHumboldtstrasse 508010GrazAustria
- Austrian Centre of Industrial Biotechnology (ACIB)Austria
| | - Silvia M. Glueck
- Department of Chemistry, Organic & Bioorganic ChemistryUniversity of Graz, NAWI Graz, BioTechMed GrazHeinrichstrasse 28/28010GrazAustria
- Austrian Centre of Industrial Biotechnology (ACIB)Austria
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3
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Payer SE, Marshall SA, Bärland N, Sheng X, Reiter T, Dordic A, Steinkellner G, Wuensch C, Kaltwasser S, Fisher K, Rigby SEJ, Macheroux P, Vonck J, Gruber K, Faber K, Himo F, Leys D, Pavkov-Keller T, Glueck SM. Regioselektivepara-Carboxylierung von Catecholen mit einer Prenylflavin-abhängigen Decarboxylase. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Stefan E. Payer
- Institut für Chemie, Organische & Bioorganische Chemie; Universität Graz, NAWI Graz, BioTechMed Graz; Heinrichstraße 28/2 8010 Graz Österreich
| | - Stephen A. Marshall
- Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN Großbritannien
| | - Natalie Bärland
- Max-Planck-Institut für Biophysik; Max-Von-Laue-Straße 3 60438 Frankfurt am Main Deutschland
| | - Xiang Sheng
- Department of Organic Chemistry; Arrhenius Laboratory; Stockholm University; 10691 Stockholm Schweden
| | - Tamara Reiter
- Austrian Centre of Industrial Biotechnology (ACIB); Österreich
| | - Andela Dordic
- Institut für Molekulare Biowissenschaften; Universität Graz, NAWI Graz, BioTechMed Graz; Humboldtstraße 50 8010 Graz Österreich
- Austrian Centre of Industrial Biotechnology (ACIB); Österreich
| | - Georg Steinkellner
- Institut für Molekulare Biowissenschaften; Universität Graz, NAWI Graz, BioTechMed Graz; Humboldtstraße 50 8010 Graz Österreich
- Austrian Centre of Industrial Biotechnology (ACIB); Österreich
| | | | - Susann Kaltwasser
- Max-Planck-Institut für Biophysik; Max-Von-Laue-Straße 3 60438 Frankfurt am Main Deutschland
| | - Karl Fisher
- Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN Großbritannien
| | - Stephen E. J. Rigby
- Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN Großbritannien
| | - Peter Macheroux
- Institut für Biochemie; Technische Universität Graz; Petersgasse 12 8010 Graz Österreich
| | - Janet Vonck
- Max-Planck-Institut für Biophysik; Max-Von-Laue-Straße 3 60438 Frankfurt am Main Deutschland
| | - Karl Gruber
- Institut für Molekulare Biowissenschaften; Universität Graz, NAWI Graz, BioTechMed Graz; Humboldtstraße 50 8010 Graz Österreich
| | - Kurt Faber
- Institut für Chemie, Organische & Bioorganische Chemie; Universität Graz, NAWI Graz, BioTechMed Graz; Heinrichstraße 28/2 8010 Graz Österreich
| | - Fahmi Himo
- Department of Organic Chemistry; Arrhenius Laboratory; Stockholm University; 10691 Stockholm Schweden
| | - David Leys
- Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN Großbritannien
| | - Tea Pavkov-Keller
- Institut für Molekulare Biowissenschaften; Universität Graz, NAWI Graz, BioTechMed Graz; Humboldtstraße 50 8010 Graz Österreich
- Austrian Centre of Industrial Biotechnology (ACIB); Österreich
| | - Silvia M. Glueck
- Institut für Chemie, Organische & Bioorganische Chemie; Universität Graz, NAWI Graz, BioTechMed Graz; Heinrichstraße 28/2 8010 Graz Österreich
- Austrian Centre of Industrial Biotechnology (ACIB); Österreich
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Vanhoutte I, Audenaert K, De Gelder L. Biodegradation of Mycotoxins: Tales from Known and Unexplored Worlds. Front Microbiol 2016; 7:561. [PMID: 27199907 PMCID: PMC4843849 DOI: 10.3389/fmicb.2016.00561] [Citation(s) in RCA: 112] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 04/04/2016] [Indexed: 12/24/2022] Open
Abstract
Exposure to mycotoxins, secondary metabolites produced by fungi, may infer serious risks for animal and human health and lead to economic losses. Several approaches to reduce these mycotoxins have been investigated such as chemical removal, physical binding, or microbial degradation. This review focuses on the microbial degradation or transformation of mycotoxins, with specific attention to the actual detoxification mechanisms of the mother compound. Furthermore, based on the similarities in chemical structure between groups of mycotoxins and environmentally recalcitrant compounds, known biodegradation pathways and degrading organisms which hold promise for the degradation of mycotoxins are presented.
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Affiliation(s)
| | | | - Leen De Gelder
- Department of Applied BioSciences, Faculty Bioscience Engineering, Ghent UniversityGhent, Belgium
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5
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Fibinger MPC, Davids T, Böttcher D, Bornscheuer UT. A selection assay for haloalkane dehalogenase activity based on toxic substrates. Appl Microbiol Biotechnol 2015; 99:8955-62. [DOI: 10.1007/s00253-015-6686-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 05/06/2015] [Accepted: 05/08/2015] [Indexed: 12/30/2022]
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6
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Furtado RA, Gunaherath GMKB, Bastos JK, Gunatilaka AAL. Microbial Biotransformation of 16α,17-Epoxy- Ent-kaurane-19-oic acid by Beauveria Sulfurescens ATCC 7159-F. Nat Prod Commun 2013. [DOI: 10.1177/1934578x1300800802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Biotransformation of 16α,17-epoxy- ent-kaurane-19-oic acid (1) by Beauveria sulfurescens ATCC 7159-F led to the production of a new ent-kaurane diterpenoid, 7β,17-dihydroxy- ent-kaur-15-en-19-oic acid (7), and four other ent-kauranes (8 - 11), all of which were identified as their methyl esters. Compounds 9 and 10 were found to be new stereoisomers. Structures of these were established by the extensive usage of their spectroscopic characteristics.
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Affiliation(s)
- Ricardo A. Furtado
- SW Center for Natural Products Research and Commercialization, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706–6800, USA
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Avenida do Café S/N, Ribeirão Preto, São Paulo, Brazil, 14040–903
| | - G. M. Kamal B. Gunaherath
- SW Center for Natural Products Research and Commercialization, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706–6800, USA
| | - Jairo K. Bastos
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Avenida do Café S/N, Ribeirão Preto, São Paulo, Brazil, 14040–903
| | - A. A. Leslie Gunatilaka
- SW Center for Natural Products Research and Commercialization, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706–6800, USA
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Yang X, Hou J, Liu D, Deng S, Wang ZB, Kuang HX, Wang C, Yao JH, Liu KX, Ma XC. Biotransformation of isoimperatorin by Cunninghamella blakesleana AS 3.970. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcatb.2012.11.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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9
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Wang Z, Wang Y, Shi H, Su Z. Expression and production of recombinant cis-epoxysuccinate hydrolase in Escherichia coli under the control of temperature-dependent promoter. J Biotechnol 2012; 162:232-6. [PMID: 23026553 DOI: 10.1016/j.jbiotec.2012.09.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Revised: 09/10/2012] [Accepted: 09/15/2012] [Indexed: 10/27/2022]
Abstract
cis-Epoxysuccinate hydrolase (ESH) from Nocardia tartaricans CAS-52 could catalyze the stereospecific hydrolysis of cis-epoxysuccinate to L-(+)-tartrate. The ESH gene of 762 bp was cloned and its open reading frame (ORF) sequence predicted a protein of 253 amino acids. An expression plasmid carrying the ESH gene under the control of the P(L)P(R) promoter was introduced into Escherichia coli, and the ESH gene was successfully expressed in the recombinant strain. The expression conditions and scale-up production were also studied. Fed-batch fermentation of E. coli Trans 1-T1 transformant was carried out in a 2000 L fermentor to product recombinant ESH. The results showed that wet cell concentration reached to 62.45 g L(-1), and the specific activity of ESH was 380.17 U mg(-1), which could meet the requirements of industrial production of L-(+)-tartaric acid.
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Affiliation(s)
- Ziqiang Wang
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
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10
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Wang Z, Wang Y, Su Z. Purification and characterization of a cis-epoxysuccinic acid hydrolase from Nocardia tartaricans CAS-52, and expression in Escherichia coli. Appl Microbiol Biotechnol 2012; 97:2433-41. [DOI: 10.1007/s00253-012-4102-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 04/09/2012] [Accepted: 04/11/2012] [Indexed: 10/28/2022]
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11
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Akihisa T, Motoi T, Seki A, Kikuchi T, Fukatsu M, Tokuda H, Suzuki N, Kimura Y. Cytotoxic Activities and Anti-Tumor-Promoting Effects of Microbial Transformation Products of Prenylated Chalcones from Angelica keiskei. Chem Biodivers 2012; 9:318-30. [DOI: 10.1002/cbdv.201100255] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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QM/MM study of the mechanism of enzymatic limonene 1,2-epoxide hydrolysis. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:263-8. [DOI: 10.1016/j.bbapap.2011.08.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 08/29/2011] [Accepted: 08/29/2011] [Indexed: 11/22/2022]
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13
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Rontani JF, Bonin P. Production of pristane and phytane in the marine environment: role of prokaryotes. Res Microbiol 2011; 162:923-33. [DOI: 10.1016/j.resmic.2011.01.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Accepted: 01/11/2011] [Indexed: 11/24/2022]
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14
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Enantioselective Hydrolysis of Glycidyl Methylphenyl Ethers by Botryosphaeria Dothidea ZJUZQ007: Effect of Substitution Pattern on Enantioselectivity. Appl Biochem Biotechnol 2010; 164:125-32. [DOI: 10.1007/s12010-010-9120-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Accepted: 10/21/2010] [Indexed: 11/27/2022]
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15
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Khaibullin RN, Strobykina IY, Kataev VE, Lodochnikova OA, Gubaidullin AT, Balandina AA, Latypov SK. Wagner-Meerwein rearrangement of steviol 16α,17- and 15α,16-epoxides. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2010. [DOI: 10.1134/s1070428010070080] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Abstract
Dwindling petroleum feedstocks and increased CO(2)-concentrations in the atmosphere currently open the concept of using CO(2) as raw material for the synthesis of well-defined organic compounds. In parallel to recent advances in the chemical CO(2)-fixation, enzymatic (biocatalytic) carboxylation is currently being investigated at an increased pace. On the one hand, this critical review provides a concise overview on highly specific biosynthetic pathways for CO(2)-fixation and, on the other hand, a summary of biodegradation (detoxification) processes involving enzymes which possess relaxed substrate specificities, which allow their application for the regioselective carboxylation of organic substrates to furnish the corresponding carboxylic acids (145 references).
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Affiliation(s)
- Silvia M Glueck
- Research Centre Applied Biocatalysis, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
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17
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Kotik M, Štěpánek V, Marešová H, Kyslík P, Archelas A. Environmental DNA as a source of a novel epoxide hydrolase reacting with aliphatic terminal epoxides. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcatb.2008.05.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Patrignani F, Iucci L, Belletti N, Gardini F, Guerzoni ME, Lanciotti R. Effects of sub-lethal concentrations of hexanal and 2-(E)-hexenal on membrane fatty acid composition and volatile compounds of Listeria monocytogenes, Staphylococcus aureus, Salmonella enteritidis and Escherichia coli. Int J Food Microbiol 2008; 123:1-8. [DOI: 10.1016/j.ijfoodmicro.2007.09.009] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2006] [Revised: 09/03/2007] [Accepted: 09/04/2007] [Indexed: 11/17/2022]
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19
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Jia X, Wang Z, Li Z. Preparation of (S)-2-, 3-, and 4-chlorostyrene oxides with the epoxide hydrolase from Sphingomonas sp. HXN-200. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2007.12.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Wu S, Shen J, Zhou X, Chen J. A novel enantioselective epoxide hydrolase for (R)-phenyl glycidyl ether to generate (R)-3-phenoxy-1,2-propanediol. Appl Microbiol Biotechnol 2007; 76:1281-7. [PMID: 17710393 DOI: 10.1007/s00253-007-1098-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2007] [Revised: 06/24/2007] [Accepted: 06/25/2007] [Indexed: 11/25/2022]
Abstract
Bacillus sp. Z018, a novel strain producing epoxide hydrolase, was isolated from soil. The epoxide hydrolase catalyzed the stereospecific hydrolysis of (R)-phenyl glycidyl ether to generate (R)-3-phenoxy-1,2-propanediol. Epoxide hydrolase from Bacillus sp. Z018 was inducible, and (R)-phenyl glycidyl ether was able to act as an inducer. The fermentation conditions for epoxide hydrolase were 35 degrees C, pH 7.5 with glucose and NH(4)Cl as the best carbon and nitrogen source, respectively. Under optimized conditions, the biotransformation yield of 45.8% and the enantiomeric excess of 96.3% were obtained for the product (R)-3-phenoxy-1,2-propanediol.
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Affiliation(s)
- Shijin Wu
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
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Kotik M, Stepánek V, Kyslík P, Maresová H. Cloning of an epoxide hydrolase-encoding gene from Aspergillus niger M200, overexpression in E. coli, and modification of activity and enantioselectivity of the enzyme by protein engineering. J Biotechnol 2007; 132:8-15. [PMID: 17875334 DOI: 10.1016/j.jbiotec.2007.08.014] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2007] [Revised: 07/18/2007] [Accepted: 08/01/2007] [Indexed: 11/19/2022]
Abstract
The gene encoding an epoxide hydrolase from Aspergillus niger M200 has been cloned and its sequence determined. The gene is interrupted by seven introns, one exon being only nine nucleotides long. The non-coding 5'- and 3'-regions of the mRNA are composed of 47 and 76 nucleotides, respectively. Overexpression of the fungal epoxide hydrolase in E. coli TOP10 has led to a 15-fold increase in specific activity (compared to the wild-type strain). Saturation mutagenesis at codon 217 resulted in the discovery of nine enzyme variants showing in several cases profound differences in activity and enantioselectivity towards various epoxides when compared to the data of the wild-type enzyme. The site 217 is located at the entrance of the tunnel that provides the substrate with access to the active site. The exchange of Ala at this position for Cys has led to a doubled enantioselectivity (E-value of 5.0) towards benzyl glycidyl ether. The same substitution resulted in a threefold-enhanced activity of the enzyme towards allyl glycidyl ether and styrene oxide without affecting enantioselectivity. The variant A217L showed an enhanced enantioselectivity towards tert-butyl glycidyl ether reaching an E-value of 100 (from 60 for the wild-type enzyme). Replacement of A217 by Val has led to higher activity towards allyl glycidyl ether by a factor of six. The substitutions Ala-->Glu and Ala-->Gln increased the enantioselectivity towards allyl glycidyl ether and styrene oxide by over 50% to E-values of 10 and 16, respectively. The study underlines that single amino acid exchanges in the substrate tunnel region can lead to significant improvements in enantioselectivity and activity of the epoxide hydrolase from A. niger M200.
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Affiliation(s)
- Michael Kotik
- Laboratory of Enzyme Technology, Institute of Microbiology, Academy of Sciences of the Czech Republic, v.v.i., Vídenská 1083, 142 20 Prague 4, Czech Republic.
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22
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Microbial transformation of dehydrocostuslactone and costunolide by Mucor polymorphosporus and Aspergillus candidus. Enzyme Microb Technol 2007. [DOI: 10.1016/j.enzmictec.2006.07.043] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Chang SF, Yang LM, Hsu FL, Hsu JY, Liaw JH, Lin SJ. Transformation of steviol-16alpha,17-epoxide by Streptomyces griseus and Cunninghamella bainieri. JOURNAL OF NATURAL PRODUCTS 2006; 69:1450-5. [PMID: 17067160 DOI: 10.1021/np0602564] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Eight new ent-beyerane metabolites, 5-8, 12, and 14-16, and four new ent-kaurane metabolites, 3, 10, 11, and 13, together with two known metabolites, 4 and 9, were isolated from the microbial transformations of steviol-16alpha,17-epoxide using Streptomyces griseus ATCC 10137 and Cunninghamella bainieri ATCC 9244. The structures of the metabolites were characterized by IR, HRFABMS, and 1D and 2D NMR data. In addition, a GRE (glucocorticoid response element)-mediated luciferase reporter assay was used to initially screen for the biological activity of the 11 metabolites and stevioside. Steviol (1), steviol-16alpha,17-epoxide (2), ent-11alpha,13,16alpha,17-tetrahydroxykauran-19-oic acid (3), ent-17-hydroxy-16-ketobeyeran-19-oic acid (4), ent-9alpha,13-dihydroxy-16beta,17-epoxykauran-19-oic acid (10), ent-9alpha,17-dihydroxy-16-ketobeyeran-19-oic acid (12), ent-1beta,17-dihydroxy-16-ketobeyeran-19-oic acid (14), and stevioside showed significant effects; in particular, stevioside showed almost equal potency as dexamethasone.
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Affiliation(s)
- Shwu-Fen Chang
- Department of Medicinal Chemistry, College of Pharmacy, Taipei Medical University, Taipei, Taiwan, Republic of China
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24
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Enantioselective epoxide hydrolase activity of a newly isolated microorganism, Sphingomonas echinoides EH-983, from seawater. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcatb.2006.05.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Kotik M, Kyslík P. Purification and characterisation of a novel enantioselective epoxide hydrolase from Aspergillus niger M200. Biochim Biophys Acta Gen Subj 2006; 1760:245-52. [PMID: 16343776 DOI: 10.1016/j.bbagen.2005.11.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2005] [Revised: 10/24/2005] [Accepted: 11/07/2005] [Indexed: 11/22/2022]
Abstract
Purification of a novel enantioselective epoxide hydrolase from Aspergillus niger M200 has been achieved using ammonium sulphate precipitation, ionic exchange, hydrophobic interaction, and size-exclusion chromatography, in conjunction with two additional chromatographic steps employing hydroxylapatite, and Mimetic Green. The enzyme was purified 186-fold with a yield of 15%. The apparent molecular mass of the enzyme was determined to be 77 kDa under native conditions and 40 kDa under denaturing conditions, implying a dimeric structure of the native enzyme. The isoelectric point of the enzyme was estimated to be 4.0 by isoelectric focusing electrophoresis. The enzyme has a broad substrate specificity with highest specificities towards tert-butyl glycidyl ether, para-nitrostyrene oxide, benzyl glycidyl ether, and styrene oxide. Enantiomeric ratios of 30 to more than 100 were determined for the hydrolysis reactions of 4 epoxidic substrates using the purified enzyme at a reaction temperature of 10 degrees C. Product inhibition studies suggest that the enzyme is able to differentiate to a high degree between the (R)-diol and (S)-diol product of the hydrolysis reaction with tert-butyl glycidyl ether as the substrate. The highest activity of the enzyme was at 42 degrees C and a pH of 6.8. Six peptide sequences, which were obtained by cleavage of the purified enzyme with trypsin and mass spectrometry analysis of the tryptic peptides, show high similarity with corresponding sequences originated from the epoxide hydrolase from Aspergillus niger LCP 521.
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Affiliation(s)
- Michael Kotik
- Laboratory of Enzyme Technology, Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídenská 1083, 142 20 Prague 4, Czech Republic.
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Liu Y, Sha Q, Wu S, Wang J, Yang L, Sun W. Enzymatic resolution of racemic phenyloxirane by a novel epoxide hydrolase from Aspergillus niger SQ-6 and its fed-batch fermentation. J Ind Microbiol Biotechnol 2005; 33:274-82. [PMID: 16320035 DOI: 10.1007/s10295-005-0062-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2005] [Accepted: 10/27/2005] [Indexed: 10/25/2022]
Abstract
A microorganism with the ability to catalyze the resolution of racemic phenyloxirane was isolated and identified as Aspergillus niger SQ-6. Chiral capillary electrophoresis was successfully applied to separate both phenyloxirane and phenylethanediol. The epoxide hydrolase (EH) involved in this resolution process was (R)-stereospecific and constitutively expressed. When whole cells were used during the biotransformation process, the optimum temperature and pH for stereospecific vicinal diol production were 35 degrees C and 7.0, respectively. After a 24-h conversion, the enantiomer excess of (R)-phenylethanediol produced was found to be >99%, with a conversion rate of 56%. In fed-batch fermentations at 30 degrees C for 44 h, glycerol (20 g L(-1)) and corn steep liquor (CSL) (30 g L(-1)) were chosen as the best initial carbon and nitrogen sources, and EH production was markedly improved by pulsed feeding of sucrose (2 g L(-1) h(-1)) and continuous feeding of CSL (1 g L(-1) h(-1)) at a fermentation time of 28 h. After optimization, the maximum dry cell weight achieved was 24.5+/-0.8 g L(-1); maximum EH production was 351.2+/-13.1 U L(-1) with a specific activity of 14.3+/-0.5 U g(-1). Partially purified EH exhibited a temperature optimum at 37 degrees C and pH optimum at 7.5 in 0.1 M phosphate buffer. This study presents the first evidence for the existence of a predicted epoxide racemase, which might be important in the synthesis of epoxide intermediates.
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Affiliation(s)
- Yanbin Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beiyitiao 13, Zhongguancun, Haidian, Beijing, 100080, People's Republic of China
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Kotik M, Brichac J, Kyslík P. Novel microbial epoxide hydrolases for biohydrolysis of glycidyl derivatives. J Biotechnol 2005; 120:364-75. [PMID: 16061300 DOI: 10.1016/j.jbiotec.2005.06.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2005] [Revised: 06/10/2005] [Accepted: 06/16/2005] [Indexed: 11/18/2022]
Abstract
Microbial isolates from biofilters and petroleum-polluted bioremediation sites were screened for the presence of enantioselective epoxide hydrolases active towards tert-butyl glycidyl ether, benzyl glycidyl ether, and allyl glycidyl ether. Out of 270 isolated strains, which comprised bacteria, yeasts, and filamentous fungi, four were selected based on the enantioselectivities of their epoxide hydrolases determined in biotransformation reactions. The enzyme of Aspergillus niger M200 preferentially hydrolyses (S)-tert-butyl glycidyl ether to (S)-3-tert-butoxy-1,2-propanediol with a relatively high enantioselectivity (the enantiomeric ratio E is about 30 at a reaction temperature of 28 degrees C). Epoxide hydrolases of Rhodotorula mucilaginosa M002 and Rhodococcus fascians M022 hydrolyse benzyl glycidyl ether with relatively low enantioselectivities, the former reacting predominantly with the (S)-enantiomer, the latter preferring the (R)-enantiomer. Enzymatic hydrolysis of allyl glycidyl ether by Cryptococcus laurentii M001 proceeds with low enantioselectivity (E=3). (R)-tert-Butyl glycidyl ether with an enantiomeric excess (ee) of over 99%, and (S)-3-tert-butoxy-1,2-propanediol with an ee-value of 86% have been prepared on a gram-scale using whole cells of A. niger M200. An enantiomeric ratio of approximately 100 has been determined under optimised biotransformation conditions with the partially purified epoxide hydrolase from A. niger M200. The regioselectivity of this enzyme was determined to be total for both (S)-tert-butyl glycidyl ether and (R)-tert-butyl glycidyl ether.
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Affiliation(s)
- Michael Kotik
- Laboratory of Enzyme Technology, Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídenská 1083, 142 20 Prague 4, Czech Republic.
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Barth S, Fischer M, Schmid RD, Pleiss J. Sequence and structure of epoxide hydrolases: a systematic analysis. Proteins 2004; 55:846-55. [PMID: 15146483 DOI: 10.1002/prot.20013] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Epoxide hydrolases (EC 3.3.2.3) are ubiquitous enzymes that catalyze the hydrolysis of epoxides to the corresponding vicinal diols. More than 100 epoxide hydrolases (EH) have been identified or predicted, and 3 structures are available. Although they catalyze the same chemical reaction, sequence similarity is low. To identify conserved regions, all EHs were aligned. Phylogenetic analysis identified 12 homologous families, which were grouped into 2 major superfamilies: the microsomal EH superfamily, which includes the homologous families of Mammalian, Insect, Fungal, and Bacterial EHs, and the cytosolic EH superfamily, which includes Mammalian, Plant, and Bacterial EHs. Bacterial EHs show a high sequence diversity. Based on structure comparison of three known structures from Agrobacterium radiobacter AD1 (cytosolic EH), Aspergillus niger (microsomal EH), Mus musculus (cytosolic EH), and multisequence alignment and phylogenetic analysis of 95 EHs, the modular architecture of this enzyme family was analyzed. Although core and cap domain are highly conserved, the structural differences between the EHs are restricted to only two loops: the NC-loop connecting the core and the cap and the cap-loop, which is inserted into the cap domain. EHs were assigned to either of three clusters based on loop length. By using this classification, core and cap region of all EHs, NC-loops and cap-loops of 78% and 89% of all EHs, respectively, could be modeled. Representative models are available from the Lipase Engineering Database, http://www.led.uni-stuttgart.de.
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Affiliation(s)
- Sandra Barth
- Institute of Technical Biochemistry, University of Stuttgart, Germany
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29
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Harder A, Escher BI, Schwarzenbach RP. Applicability and limitation of OSARs for the toxicity of electrophilic chemicals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2003; 37:4955-4961. [PMID: 14620823 DOI: 10.1021/es0341992] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The appropriate selection and application of quantitative structure-activity relationships (QSARs) for the prediction of toxicity is based on the prior assignment of a chemical to its mode of toxic action. This classification is often derived from structural characteristics with the underlying assumption that chemically similar compounds have similar mechanisms of action, which is often but not necessarily the case. Instead of using structural characteristics for classification toward a mode of toxic action, we used Escherichia coli based bioanalytical assays to classify electrophilic chemicals. Analyzing a series of reactive organochlorines, epoxides, and compounds with an activated double bond, three subclasses of reactive toxicity were distinguished: "glutathione depletion-related toxicity", "DNA damage", and "unspecific reactivity". For both subsets of specifically reacting compounds a direct correlation between effects and chemical reactivity was found. Reaction rate constants with either glutathione or 2'-deoxyguanosine, which was used as a model for complex DNA, served well to set up preliminary QSARs for either glutathione depletion-related toxicity or toxicity based on DNA damage in the model organism E. coli. The applicability of QSARs for electrophilic chemicals based on mechanistically relevant reaction rate constants is a priori limited to a small subset of compounds with strictly identical mechanism of toxic action and similar metabolic rates. In contrast, the proposed bioanalytical assays not only allowed the experimental identification of molecular mechanisms underlying the observable toxicity but also their toxicity values are applicable to quantitatively predict toxic effects in higher organisms by linear correlation models, independent of the assigned mode of toxic action.
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Affiliation(s)
- Angela Harder
- Swiss Federal Institute for Environmental Science and Technology (EAWAG), PO Box 611, CH-8600 Duebendorf, Switzerland
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Abstract
Epoxide hydrolases from microbial sources are highly versatile biocatalysts for the asymmetric hydrolysis of epoxides on a preparative scale. Besides kinetic resolution, which furnishes the corresponding vicinal diol and remaining non-hydrolysed epoxide in nonracemic form, enantioconvergent processes are possible: these are highly attractive as they lead to the formation of a single enantiomeric diol from a racemic oxirane. The data accumulated over recent years reveal a common picture of the substrate structure selectivity pattern of microbial epoxide hydrolases and indicate that substrates of various structural types can be selectively hydrolysed with enzymes from certain microbial sources.
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Affiliation(s)
- A Steinreiber
- Department of Chemistry, Organic and Bio-organic Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
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Guerzoni ME, Lanciotti R, Cocconcelli PS. Alteration in cellular fatty acid composition as a response to salt, acid, oxidative and thermal stresses in Lactobacillus helveticus. MICROBIOLOGY (READING, ENGLAND) 2001; 147:2255-2264. [PMID: 11496002 DOI: 10.1099/00221287-147-8-2255] [Citation(s) in RCA: 192] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The fundamental question in this study is concerned with whether the increase of unsaturated fatty acids in the cell membrane is a general response of certain thermotolerant strains or species when exposed to superoptimal temperatures, and in combination with other stresses, especially oxidative stress. A strain of Lactobacillus helveticus, a species widely used as a starter in the dairy industry and able to tolerate high temperature and NaCl concentrations as well as acidic conditions, was chosen for this study. Cells of strain CNBL 1156, grown in its natural medium (i.e. milk whey), were exposed for 100 min to sublethal combinations of temperature, NaCl, H(2)O(2) and pH, modulated according to a Central Composite Design. The fatty acid composition of cell lipid extract was identified by GC/MS. Polynomial equations, able to describe the individual interactive and quadratic effects of the independent variables on cell fatty acid composition, were obtained. The results and the mathematical models relative to the individual fatty acids indirectly suggest that desaturase activation or hyperinduction play an important role in the response to heat stress. In fact, the relative proportions of oleic, linoleic and palmitic acids increased with temperature in a range between 38 and 54 degrees C. The fatty acid profiles included vernolic acid (up to 37% of total fatty acids), an epoxide of linoleic acid not previously reported in microbial cells. In particular, this epoxide was present in cells exposed to low pH in combination with high temperatures and oxidative stress. In conclusion, these results provide experimental support to the hypothesis that the increase of an oxygen-consuming desaturase system, with a consequent increase in fatty acid desaturation, is a cellular response to environmental stresses able to protect the cells of this anaerobic micro-organism from toxic oxygen species and high temperatures.
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Affiliation(s)
- M Elisabetta Guerzoni
- Dipartimento di Protezione e Valorizzazione Agroalimentare, University of Bologna, via S. Giacomo 7, 40126 Bologna, Italy1
| | - Rosalba Lanciotti
- Dipartimento di Protezione e Valorizzazione Agroalimentare, University of Bologna, via S. Giacomo 7, 40126 Bologna, Italy1
| | - P Sandro Cocconcelli
- Istituto di Microbiologia, Centro Ricerche Biotecnologiche, University Cattolica del Sacro Cuore Piacenza-Cremona, via Emilia Parmense 84, 29100 Piacenza, Italy2
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van der Werf MJ, Jongejan H, Franssen MC. Resolution of limonene 1,2-epoxide diastereomers by mercury(II) ions. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01037-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Baldascini H, Ganzeveld KJ, Janssen DB, Beenackers AA. Effect of mass transfer limitations on the enzymatic kinetic resolution of epoxides in a two-liquid-phase system. Biotechnol Bioeng 2001; 73:44-54. [PMID: 11255151 DOI: 10.1002/1097-0290(20010405)73:1<44::aid-bit1035>3.0.co;2-c] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Optically active epoxides can be obtained by kinetic resolution of racemic mixtures using enantioselective epoxide hydrolases. To increase the productivity of the conversion of sparingly aqueous soluble epoxides, we investigated the use of a two-phase aqueous/organic system. A kinetic model which takes into account interphase mass transfer, enzymatic reaction, and enzyme inactivation was developed to describe epoxide conversion in the system by the epoxide hydrolase from Agrobacterium radiobacter. A Lewis cell was used to determine model parameters and results from resolutions carried out in the Lewis cell were compared to model predictions to validate the model. It was found that n-octane is a biocompatible immiscible solvent suitable for use as the organic phase. Good agreement between the model predictions and experimental data was found when the enzyme inactivation rate was fitted. Simulations showed that mass transfer limitations have to be avoided in order to maximize the yield of enantiomerically pure epoxide. Resolution of a 39 g/L solution of racemic styrene oxide in octane was successfully carried out in an emulsion batch reactor to obtain (S)-styrene oxide in high enantiomeric excess (>95% e.e.) with a yield of 30%.
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Affiliation(s)
- H Baldascini
- Department of Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands.
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35
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Genzel Y, Archelas A, Lutje Spelberg JH, Janssen DB, Furstoss R. Microbiological transformations. Part 48: Enantioselective biohydrolysis of 2-, 3- and 4-pyridyloxirane at high substrate concentration using the Agrobacterium radiobacter AD1 epoxide hydrolase and its Tyr215Phe mutant. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00146-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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van Hylckama Vlieg JE, Janssen DB. Formation and detoxification of reactive intermediates in the metabolism of chlorinated ethenes. J Biotechnol 2001; 85:81-102. [PMID: 11165358 DOI: 10.1016/s0168-1656(00)00364-3] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Short-chain halogenated aliphatics, such as chlorinated ethenes, constitute a large group of priority pollutants. This paper gives an overview on the chemical and physical properties of chlorinated aliphatics that are critical in determining their toxicological characteristics and recalcitrance to biodegradation. The toxic effects and principle metabolic pathways of halogenated ethenes in mammals are briefly discussed. Furthermore, the bacterial degradation of halogenated compounds is reviewed and it is described how product toxicity may explain why most chlorinated ethenes are only degraded cometabolically under aerobic conditions. The cometabolic degradation of chlorinated ethenes by oxygenase-producing microorganisms has been extensively studied. The physiology and bioremediation potential of methanotrophs has been well characterized and an overview of the available data on these organisms is presented. The sensitivity of methanotrophs to product toxicity is a major limitation for the transformation of chlorinated ethenes by these organisms. Most toxic effects arise from the inability to detoxify the reactive chlorinated epoxyethanes occurring as primary metabolites. Therefore, the last part of this review focuses on the metabolic reactions and enzymes that are involved in the detoxification of epoxides in mammals. A key role is played by glutathione S-transferases. Furthermore, an overview is presented on the current knowledge about bacterial enzymes involved in the metabolism of epoxides. Such enzymes might be useful for detoxifying chlorinated ethene epoxides and an example of a glutathione S-transferase with activity for dichloroepoxyethane is highlighted.
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Affiliation(s)
- J E van Hylckama Vlieg
- Department of Biochemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, NL-9747 AG, Groningen, The Netherlands
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37
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Genzel Y, Archelas A, Broxterman QB, Schulze B, Furstoss R. Microbiological transformations. 47. A step toward a green chemistry preparation of enantiopure (S)-2-, -3-, and -4-pyridyloxirane via an epoxide hydrolase catalyzed kinetic resolution. J Org Chem 2001; 66:538-43. [PMID: 11429826 DOI: 10.1021/jo001406x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The biocatalyzed hydrolytic kinetic resolution of 2-, 3-, and 4-pyridyloxirane by the Aspergillus niger epoxide hydrolase (EH) has been explored. This was used to perform a gram scale preparation of these epoxides of (S) absolute configuration using a process performed at a concentration as high as 10 g/L (82 mM). All three epoxides have been obtained in a nearly enantiopure form (ee > 98%). Interestingly, it was shown that this biotransformation could be achieved using plain water instead of buffer solution, an important improvement as far as downstream processing of an eventual industrial process is concerned. Neither of these substrates could be obtained in reasonable enantiomeric purity and yield using the nowadays most efficient metal-based catalysts.
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Affiliation(s)
- Y Genzel
- Groupe Biocatalyse et Chimie Fine, ESA 6111 associée au CNRS, Université de la Méditerranée, Faculté des Sciences de Luminy, Case 901, 163 avenue de Luminy, 13288 Marseille, France
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38
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Genzel Y, Archelas A, Broxterman Q, Schulze B, Furstoss R. Microbiological transformations. Part 46: Preparation of enantiopure (S)-2-pyridyloxirane via epoxide hydrolase-catalysed kinetic resolution. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(00)00285-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Panke S, Wubbolts MG, Schmid A, Witholt B. Production of enantiopure styrene oxide by recombinant Escherichia coli synthesizing a two-component styrene monooxygenase. Biotechnol Bioeng 2000; 69:91-100. [PMID: 10820335 DOI: 10.1002/(sici)1097-0290(20000705)69:1<91::aid-bit11>3.0.co;2-x] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A whole cell biocatalytic process was developed to enable the efficient oxidation of styrene to chiral (S)-styrene oxide with an enantiomeric excess better than 99%. Recombinant Escherichia coli cells were employed to express the genes styAB encoding the styrene monooxygenase of Pseudomonas sp. strain VLB120 from an expression plasmid utilizing the alk regulatory system of P. oleovorans GPo1. The strains reached specific activities of up to 70 U* (g cell dry weight)(-1) in shake-flask experiments with glucose as the carbon source. An efficient two-liquid phase fed-batch process was established for the production of (S)-styrene oxide with hexadecane as an apolar carrier solvent and a nutrient feed consisting of glucose, magnesium sulfate, and yeast extract. Engineering of the phase fraction and the composition of organic phase and feed led to a 2-L scale process with maximal volumetric productivities of 2.2 g (S)-styrene oxide per liter liquid volume per hour. This optimized process was based completely on defined medium and used bis(2-ethylhexyl)phthalate as the apolar carrier solvent, which together with substrate and inducer consisted of 50% of the total liquid volume. Using this system, we were able to produce per liter liquid volume 11 g of enantiopure (S)-styrene oxide in 10 h.
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Affiliation(s)
- S Panke
- Institute of Biotechnology, Swiss Federal Institute of Technology, Hönggerberg HPT, 8051 Zürich, Switzerland
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40
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Abstract
Epoxide hydrolases from bacterial and fungal sources are highly versatile biocatalysts for the asymmetric hydrolysis of epoxides on a preparative scale. Besides kinetic resolution, which yields the corresponding enantiomerically enriched vicinal diol and the remaining nonconverted epoxide, enantioconvergent processes are also possible, which lead to the formation of a single enantiomeric diol from a racemic oxirane. The data available to date indicate that the enantioselectivities of enzymes from certain microbial sources can be correlated to the substitutional pattern of various types of substrates: red yeasts (e.g. Rhodotorula or Rhodosporidium sp.) give best enantioselectivities with monosubstituted oxiranes; fungal cells (e.g. from Aspergillus and Beauveria sp.) are best suited for styrene oxide-type substrates; bacterial enzymes, on the other hand (in particular from Actinomycetes such as Rhodococcus and Nocardia sp.) are the biocatalysts of choice for more highly substituted 2,2- and 2,3-disubstituted epoxides.
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Affiliation(s)
- R V Orru
- Institute of Organic Chemistry, University of Graz Heinrichstrasse 28 A-8010, Graz Austria
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41
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Allen JR, Ensign SA. Two short-chain dehydrogenases confer stereoselectivity for enantiomers of epoxypropane in the multiprotein epoxide carboxylating systems of Xanthobacter strain Py2 and Nocardia corallina B276. Biochemistry 1999; 38:247-56. [PMID: 9890905 DOI: 10.1021/bi982114h] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Epoxide carboxylase from the bacterium Xanthobacter strain Py2 is a multicomponent enzyme system which catalyzes the pyridine nucleotide-dependent carboxylation of aliphatic epoxides to beta-ketoacids as illustrated by the reaction epoxypropane + CO2 + NADPH + NAD+ --> acetoacetate + H+ + NADP+ + NADH. The combination of four distinct proteins, designated components I-IV, are required for the reconstitution of epoxide carboxylase activity with racemic mixtures of short-chain (C3-C5) terminal epoxyalkanes. In this work, components III and IV of the epoxide carboxylase system are shown to confer specificity for epoxyalkane enantiomers. Components I-III supported the carboxylation of (R)-epoxypropane, while components I, II, and IV supported the carboxylation of (S)-epoxypropane. At fixed concentrations of components I and II, the rates of (R)- and (S)-epoxypropane carboxylation saturated with increasing concentrations of component III or IV to give identical maximal rates for the two epoxide substrates. (S)-Epoxypropane was an inactivator of (R)-epoxypropane carboxylation by components I- III, while (R)-epoxypropane was an inactivator of (S)-epoxypropane carboxylation by components I, II, and IV. These inactivating effects were fully reversed upon the addition of the correct complementing dehydrogenase component. Amino acid sequence analysis of components III and IV demonstrates that they belong to the short-chain dehydrogenase/reductase (SDR) family of enzymes. Both components contain highly conserved residues within the coenzyme binding fold and catalytic regions found in SDR enzymes. Components III and IV are proposed to catalyze the NAD+-dependent abstraction of a hydride from a chiral secondary alcohol-like intermediate bound to the active site component of the enzyme system to form the corresponding beta-ketone intermediate. A multicomponent epoxide carboxylase system was purified to homogeneity from Nocardia corallina B276, a bacterium phylogenetically unrelated to Xanthobacter Py2, and found to consist of four proteins with functions identical to those of the Xanthobacter Py2 system. The stereoselective dehydrogenases of the Xanthobacter epoxide carboxylase system were able to substitute for the corresponding components of the N. corallina system when using (R)- and (S)-epoxypropane as substrates, and vice versa. These results provide the first demonstration of the involvement of stereospecific dehydrogenases in aliphatic epoxide metabolism and provide new insights into microbial strategies for the utilization of chiral organic molecules.
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Affiliation(s)
- J R Allen
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322-0300, USA
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42
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van der Werf MJ, Overkamp KM, de Bont JA. Limonene-1,2-epoxide hydrolase from Rhodococcus erythropolis DCL14 belongs to a novel class of epoxide hydrolases. J Bacteriol 1998; 180:5052-7. [PMID: 9748436 PMCID: PMC107539 DOI: 10.1128/jb.180.19.5052-5057.1998] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
An epoxide hydrolase from Rhodococcus erythropolis DCL14 catalyzes the hydrolysis of limonene-1,2-epoxide to limonene-1,2-diol. The enzyme is induced when R. erythropolis is grown on monoterpenes, reflecting its role in the limonene degradation pathway of this microorganism. Limonene-1,2-epoxide hydrolase was purified to homogeneity. It is a monomeric cytoplasmic enzyme of 17 kDa, and its N-terminal amino acid sequence was determined. No cofactor was required for activity of this colorless enzyme. Maximal enzyme activity was measured at pH 7 and 50 degrees C. None of the tested inhibitors or metal ions inhibited limonene-1,2-epoxide hydrolase activity. Limonene-1,2-epoxide hydrolase has a narrow substrate range. Of the compounds tested, only limonene-1,2-epoxide, 1-methylcyclohexene oxide, cyclohexene oxide, and indene oxide were substrates. This report shows that limonene-1,2-epoxide hydrolase belongs to a new class of epoxide hydrolases based on (i) its low molecular mass, (ii) the absence of any significant homology between the partial amino acid sequence of limonene-1,2-epoxide hydrolase and amino acid sequences of known epoxide hydrolases, (iii) its pH profile, and (iv) the inability of 2-bromo-4'-nitroacetophenone, diethylpyrocarbonate, 4-fluorochalcone oxide, and 1, 10-phenanthroline to inhibit limonene-1,2-epoxide hydrolase activity.
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Affiliation(s)
- M J van der Werf
- Division of Industrial Microbiology, Department of Food Technology and Nutritional Sciences, Wageningen Agricultural University, 6700 EV Wageningen, The Netherlands
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