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Martínez-Navarro ME, Escobar-Talavera J, Cebrián-Tarancón C, Llorens S, Alonso GL, Salinas MR. Gastrointestinal digestion of olive leaf waste from olive mill production chain in a simulator of the gastrointestinal tract. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024; 104:7550-7556. [PMID: 38747313 DOI: 10.1002/jsfa.13576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 02/25/2024] [Accepted: 04/29/2024] [Indexed: 08/07/2024]
Abstract
BACKGROUND Currently, olive leaves are considered waste, although their high phenolic content makes them a source of antioxidants that could be used directly. The aim of this work was to study the behavior of phenolic compounds contained in olive leaf from the olive mill production chain during their gastrointestinal digestion. RESULTS Phenolic compounds in the gastric digestion analyzed by high-performance liquid chromatography-diode array detection-mass spectrometry increased by 58% to 314.5% compared to the meal, while in the intestinal stage they ranged from 1.87 to 9.04 times higher. An increase of between 187% and 903% in bioaccessibility of phenolic compounds in the intestinal phase was observed, except for verbascoside. Furthermore, such compounds were fully bioavailable, except for apigenin-7-O-glucoside, which showed a bioavailability of 56%. CONCLUSION The current study showed that the concentration of oleuropein, apigegin-7-O-glucoside, hydroxytyrosol hexoside and hydroxytyrosol contained in olive leaf continued to be extracted during the gastrointestinal digestion process. Furthermore, the results obtained with respect to their bioaccessibility and bioavailability suggest a good disposition to pass into the bloodstream where they could exert beneficial effects. Therefore, these results are promising for olive leaf becoming a consumable by-product that could be directly ingested through a simple infusion. © 2024 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- María Esther Martínez-Navarro
- Cátedra de Química Agrícola, ETSI Agronómica y de Montes y Biotecnología, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Jorge Escobar-Talavera
- Cátedra de Química Agrícola, ETSI Agronómica y de Montes y Biotecnología, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Cristina Cebrián-Tarancón
- Cátedra de Química Agrícola, ETSI Agronómica y de Montes y Biotecnología, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Silvia Llorens
- Centro Regional de Investigaciones Biomédicas (CRIB), Department of Medical Sciences, Faculty of Medicine of Albacete, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Gonzalo L Alonso
- Cátedra de Química Agrícola, ETSI Agronómica y de Montes y Biotecnología, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Albacete, Spain
| | - M Rosario Salinas
- Cátedra de Química Agrícola, ETSI Agronómica y de Montes y Biotecnología, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Albacete, Spain
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Mermigka G, Vavouraki AI, Nikolaou C, Cheiladaki I, Vourexakis M, Goumas D, Ververidis F, Trantas E. An Engineered Plant Metabolic Pathway Results in High Yields of Hydroxytyrosol Due to a Modified Whole-Cell Biocatalysis in Bioreactor. Metabolites 2023; 13:1126. [PMID: 37999222 PMCID: PMC10672836 DOI: 10.3390/metabo13111126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/26/2023] [Accepted: 10/31/2023] [Indexed: 11/25/2023] Open
Abstract
Hydroxytyrosol (HT) is a phenolic substance primarily present in olive leaves and olive oil. Numerous studies have shown its advantages for human health, making HT a potentially active natural component with significant added value. Determining strategies for its low-cost manufacturing by metabolic engineering in microbial factories is hence still of interest. The objective of our study was to assess and improve HT production in a one-liter bioreactor utilizing genetically modified Escherichia coli strains that had previously undergone fed-batch testing. Firstly, we compared the induction temperatures in small-scale whole-cell biocatalysis studies and then examined the optimal temperature in a large volume bioreactor. By lowering the induction temperature, we were able to double the yield of HT produced thereby, reaching 82% when utilizing tyrosine or L-DOPA as substrates. Hence, without the need to further modify our original strains, we were able to increase the HT yield.
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Affiliation(s)
- Glykeria Mermigka
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
- Agri-Food and Life Sciences Institute (Agro-Health), HMU Research and Innovation Center, GR71410 Heraklion, Greece
| | - Aikaterini I. Vavouraki
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
| | - Chrysoula Nikolaou
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
| | - Ioanna Cheiladaki
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
| | - Michail Vourexakis
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
| | - Dimitrios Goumas
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
- Agri-Food and Life Sciences Institute (Agro-Health), HMU Research and Innovation Center, GR71410 Heraklion, Greece
| | - Filippos Ververidis
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
- Agri-Food and Life Sciences Institute (Agro-Health), HMU Research and Innovation Center, GR71410 Heraklion, Greece
| | - Emmanouil Trantas
- Laboratory of Biological and Biotechnological Applications (LBBA), Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University (HMU), GR71410 Heraklion, Greece; (G.M.); (A.I.V.); (C.N.); (I.C.); (M.V.); (D.G.)
- Agri-Food and Life Sciences Institute (Agro-Health), HMU Research and Innovation Center, GR71410 Heraklion, Greece
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3
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Liu J, Wang K, Wang M, Deng H, Chen X, Shang Y, Liu X, Yu X. Efficient whole cell biotransformation of tyrosol from L-tyrosine by engineered Escherichia coli. Enzyme Microb Technol 2022; 160:110100. [PMID: 35872508 DOI: 10.1016/j.enzmictec.2022.110100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 07/14/2022] [Accepted: 07/17/2022] [Indexed: 11/03/2022]
Abstract
An engineered Escherichia coli was constructed by co-expressing L-amino acid deaminase, α-keto acid decarboxylase, alcohol dehydrogenase, and glucose dehydrogenase through two plasmids for tyrosol production. The activity of the rate-limiting enzyme L-amino acid deaminase from Cosenzaea myxofaciens (CmAAD) toward tyrosine was improved by structure-guided modification. The enzyme activity of triple mutant CmAAD V438G/K147V/R151E toward tyrosine was ~5.12-fold higher than that of the wild-type CmAAD. Secondly, the plasmid copy numbers and the gene orders were optimized to improve the titer of tyrosol. Finally, the recombinant strain CS-6 transformed 10 mM tyrosine into 9.56 ± 0.64 mM tyrosol at 45 ℃, and the space-time yield reached 0.478 mM·L-1·h-1. This study proposes a novel idea for the efficient and natural production of tyrosol, which has great potential for industrial application.
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Affiliation(s)
- Jinbin Liu
- School of Marine and Bioengineering, YanCheng Institute of Technology, Yancheng, Jiangsu 224051, China
| | - Kaipeng Wang
- School of Marine and Bioengineering, YanCheng Institute of Technology, Yancheng, Jiangsu 224051, China
| | - Mian Wang
- School of Marine and Bioengineering, YanCheng Institute of Technology, Yancheng, Jiangsu 224051, China
| | - Huaxiang Deng
- Center for Synthetic Biochemistry, Institute of Synthetic Biology, Institutes of Advanced Technologies, Shenzhen, China
| | - Xiaodong Chen
- School of Marine and Bioengineering, YanCheng Institute of Technology, Yancheng, Jiangsu 224051, China
| | - Yueling Shang
- School of Marine and Bioengineering, YanCheng Institute of Technology, Yancheng, Jiangsu 224051, China
| | - Xiaochen Liu
- School of Marine and Bioengineering, YanCheng Institute of Technology, Yancheng, Jiangsu 224051, China
| | - Xiaohong Yu
- School of Marine and Bioengineering, YanCheng Institute of Technology, Yancheng, Jiangsu 224051, China.
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Photocatalytic Partial Oxidation of Tyrosol: Improving the Selectivity Towards Hydroxytyrosol by Surface Fluorination of TiO2. Top Catal 2020. [DOI: 10.1007/s11244-020-01287-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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5
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Deri-Zenaty B, Bachar S, Rebroš M, Fishman A. A coupled enzymatic reaction of tyrosinase and glucose dehydrogenase for the production of hydroxytyrosol. Appl Microbiol Biotechnol 2020; 104:4945-4955. [PMID: 32285177 DOI: 10.1007/s00253-020-10594-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 03/22/2020] [Accepted: 03/31/2020] [Indexed: 12/12/2022]
Abstract
Hydroxytyrosol (HT) is a diphenolic compound prevalent mainly in olives with pronounced antioxidant activity and proven benefits for human health. Current production limitations have motivated studies concerning the hydroxylation of tyrosol to HT with tyrosinase; however, accumulation of the diphenol is restricted due to its rapid subsequent oxidation to 3,4-quinone-phenylethanol. In this study, a continuous two-enzyme reaction system of sol-gel-immobilized tyrosinase and glucose dehydrogenase (GDH) was developed for the synthesis of HT. Purified tyrosinase from Bacillus megaterium (TyrBm) and E. coli cell extract expressing GDH from B. megaterium were encapsulated in a sol-gel matrix based on triethoxysilane precursors. While tyrosinase oxidized tyrosol to 3,4-quinone-phenylethanol, GDH catalyzed the simultaneous reduction of the cofactor NAD+ to NADH, which was the reducing agent enabling the accumulation of HT. Using 50 mM tyrosol, the immobilized system under optimized conditions, enabled a final HT yield of 7.68 g/L with productivity of 2.30 mg HT/mg TyrBm beads. Furthermore, the immobilized bi-enzyme system showed the feasibility for HT production from 1 mM tyrosol using a 0.5-L bioreactor as well as stable activity over 8 repeated cycles. The production of other diphenols with commercial importance such as L-dopa (3,4-dihydroxyphenylalanine) or piceatannol may be synthesized with this efficient approach.
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Affiliation(s)
- Batel Deri-Zenaty
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
| | - Shani Bachar
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
| | - Martin Rebroš
- Institute of Biotechnology, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovakia
| | - Ayelet Fishman
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, 3200003, Haifa, Israel.
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6
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Trantas E, Navakoudis E, Pavlidis T, Nikou T, Halabalaki M, Skaltsounis L, Ververidis F. Dual pathway for metabolic engineering of Escherichia coli to produce the highly valuable hydroxytyrosol. PLoS One 2019; 14:e0212243. [PMID: 31682615 PMCID: PMC6828502 DOI: 10.1371/journal.pone.0212243] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 10/02/2019] [Indexed: 11/24/2022] Open
Abstract
One of the most abundant phenolic compounds traced in olive tissues is hydroxytyrosol (HT), a molecule that has been attributed with a pile of beneficial effects, well documented by many epidemiological studies and thus adding value to products containing it. Strong antioxidant capacity and protection from cancer are only some of its exceptional features making it ideal as a potential supplement or preservative to be employed in the nutraceutical, agrochemical, cosmeceutical, and food industry. The HT biosynthetic pathway in plants (e.g. olive fruit tissues) is not well apprehended yet. In this contribution we employed a metabolic engineering strategy by constructing a dual pathway introduced in Escherichia coli and proofing its significant functionality leading it to produce HT. Our primary target was to investigate whether such a metabolic engineering approach could benefit the metabolic flow of tyrosine introduced to the conceived dual pathway, leading to the maximalization of the HT productivity. Various gene combinations derived from plants or bacteria were used to form a newly inspired, artificial biosynthetic dual pathway managing to redirect the carbon flow towards the production of HT directly from glucose. Various biosynthetic bottlenecks faced due to feaB gene function, resolved through the overexpression of a functional aldehyde reductase. Currently, we have achieved equimolar concentration of HT to tyrosine as precursor when overproduced straight from glucose, reaching the level of 1.76 mM (270.8 mg/L) analyzed by LC-HRMS. This work realizes the existing bottlenecks of the metabolic engineering process that was dependent on the utilized host strain, growth medium as well as to other factors studied in this work.
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Affiliation(s)
- Emmanouil Trantas
- Plant Biochemistry and Biotechnology Group, Laboratory of Biological and Biotechnological Applications, Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University, Heraklion, Greece
- * E-mail: (FV); (ET)
| | - Eleni Navakoudis
- Plant Biochemistry and Biotechnology Group, Laboratory of Biological and Biotechnological Applications, Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University, Heraklion, Greece
| | - Theofilos Pavlidis
- Plant Biochemistry and Biotechnology Group, Laboratory of Biological and Biotechnological Applications, Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University, Heraklion, Greece
| | - Theodora Nikou
- Division of Pharmacognosy and Natural Product Chemistry, Department of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, Greece
| | - Maria Halabalaki
- Division of Pharmacognosy and Natural Product Chemistry, Department of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, Greece
| | - Leandros Skaltsounis
- Division of Pharmacognosy and Natural Product Chemistry, Department of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, Greece
| | - Filippos Ververidis
- Plant Biochemistry and Biotechnology Group, Laboratory of Biological and Biotechnological Applications, Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University, Heraklion, Greece
- * E-mail: (FV); (ET)
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7
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Li C, Jia P, Bai Y, Fan TP, Zheng X, Cai Y. Efficient Synthesis of Hydroxytyrosol from l-3,4-Dihydroxyphenylalanine Using Engineered Escherichia coli Whole Cells. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:6867-6873. [PMID: 31134807 DOI: 10.1021/acs.jafc.9b01856] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hydroxytyrosol is a high-value-added compound with a variety of biological and pharmacological activities. In this study, a whole-cell catalytic method for the synthesis of hydroxytyrosol was developed: aromatic amino acid aminotransferase (TyrB), l-glutamate dehydrogenase (GDH), α-keto acid decarboxylase (PmKDC), and aldehyde reductase (YahK) were co-expressed in Escherichia coli to catalyze the synthesis of hydroxytyrosol from l-3,4-dihydroxyphenylalanine (l-DOPA). The plasmids with different copy numbers were used to balance the expression of the four enzymes, and the most appropriate strain (pRSF- yahK- tyrB and pCDF- gdh- Pmkdc) was identified. After determination of the optimum temperature (35 °C) and pH (7.5) for whole-cell catalysis, the yield of hydroxytyrosol reached 36.33 mM (5.59 g/L) and the space-time yield reached 0.70 g L-1 h-1.
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Affiliation(s)
- Chaozhi Li
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology , Jiangnan University , 1800 Lihu Road , Wuxi , Jiangsu 214122 , People's Republic of China
| | - Pu Jia
- College of Life Sciences , Northwest University , Xi'an , Shaanxi 710069 , People's Republic of China
| | - Yajun Bai
- College of Life Sciences , Northwest University , Xi'an , Shaanxi 710069 , People's Republic of China
| | - Tai-Ping Fan
- Department of Pharmacology , University of Cambridge , Cambridge CB2 1PD , United Kingdom
| | - Xiaohui Zheng
- College of Life Sciences , Northwest University , Xi'an , Shaanxi 710069 , People's Republic of China
| | - Yujie Cai
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology , Jiangnan University , 1800 Lihu Road , Wuxi , Jiangsu 214122 , People's Republic of China
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8
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Britton J, Davis R, O'Connor KE. Chemical, physical and biotechnological approaches to the production of the potent antioxidant hydroxytyrosol. Appl Microbiol Biotechnol 2019; 103:5957-5974. [PMID: 31177312 DOI: 10.1007/s00253-019-09914-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/13/2019] [Accepted: 05/15/2019] [Indexed: 12/12/2022]
Abstract
Hydroxytyrosol (HT) is a polyphenol of interest to the food, feed, supplements and pharmaceutical sectors. It is one of the strongest known natural antioxidants and has been shown to confer other benefits such as anti-inflammatory and anti-carcinogenic properties, and it has the potential to act as a cardio- and neuroprotectant. It is known to be one of the compounds responsible for the health benefits of the Mediterranean diet. In nature, HT is found in the olive plant (Olea europaea) as part of the secoiridoid compound oleuropein, in its leaves, fruit, oil and oil production waste products. HT can be extracted from these olive sources, but it can also be produced by chemical synthesis or through the use of microorganisms. This review looks at the production of HT using plant extraction, chemical synthesis and biotechnological approaches.
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Affiliation(s)
- James Britton
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Reeta Davis
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Kevin E O'Connor
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin 4, Ireland. .,Beacon Bioeconomy Research Centre, University College Dublin, Belfield, Dublin 4, Ireland.
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9
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Evolution of the phenolic compounds profile of olive leaf extract encapsulated by spray-drying during in vitro gastrointestinal digestion. Food Chem 2019; 279:40-48. [DOI: 10.1016/j.foodchem.2018.11.127] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 10/30/2018] [Accepted: 11/22/2018] [Indexed: 12/15/2022]
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10
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Inhibition of lysozyme fibrillogenesis by hydroxytyrosol and dopamine: An Atomic Force Microscopy study. Int J Biol Macromol 2018; 111:1100-1105. [PMID: 29360548 DOI: 10.1016/j.ijbiomac.2018.01.112] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 01/15/2018] [Accepted: 01/17/2018] [Indexed: 01/01/2023]
Abstract
Protein aggregation underlies many human diseases characterized by the deposition of normally soluble proteins in both fibrillar and amorphous aggregates. Here, Atomic Force Microscopy (AFM) has been applied to investigate the ability to inhibit hen egg white lysozyme (HEWL) fibrillogenesis by hydroxytyrosol (HT), one of the main phenolic components of olive oil. In this framework, HEWL is a useful and well-studied model protein whose amyloid-like fibril formation can be induced under experimental conditions where HT is more stable. HEWL fibrils, obtained at pH 1.6 and at 65 °C, exhibited a height of about 3 nm and a fibril length on average of about 3 μm. The presence of HT reduced the HEWL fibril number and length with respect to the control sample. Interestingly, also dopamine, a compound with a chemical structure similar to HT, decreased both the fibril number and the fibril length. AFM experimental data were supported by Thioflavin T assay and Fourier transform infrared spectroscopy. Our results show that HT is an effective inhibitor of HEWL aggregation, thus suggesting possible future applications of this natural compound for potential prevention or treatment of amyloid diseases, or as a lead molecular structure for the design of improved modulators.
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Lock M, Nichol T, Murrell JC, Smith TJ. Mutagenesis and expression of methane monooxygenase to alter regioselectivity with aromatic substrates. FEMS Microbiol Lett 2017; 364:3906680. [PMID: 28854685 PMCID: PMC5812538 DOI: 10.1093/femsle/fnx137] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 06/27/2017] [Indexed: 11/13/2022] Open
Abstract
Soluble methane monooxygenase (sMMO) from methane-oxidising bacteria can oxygenate more than 100 hydrocarbons and is one of the most catalytically versatile biological oxidation catalysts. Expression of recombinant sMMO has to date not been achieved in Escherichia coli and so an alternative expression system must be used to manipulate it genetically. Here we report substantial improvements to the previously described system for mutagenesis of sMMO and expression of recombinant enzymes in a methanotroph (Methylosinus trichosporium OB3b) expression system. This system has been utilised to make a number of new mutants and to engineer sMMO to increase its catalytic precision with a specific substrate whilst increasing activity by up to 6-fold. These results are the first 'proof-of-principle' experiments illustrating the feasibility of developing sMMO-derived catalysts for diverse applications.
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Affiliation(s)
- Malcolm Lock
- Biomolecular Sciences Research Centre, Sheffield Hallam University, Sheffield S1 1WB, UK
| | - Tim Nichol
- Biomolecular Sciences Research Centre, Sheffield Hallam University, Sheffield S1 1WB, UK
| | - J. Colin Murrell
- School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK
| | - Thomas J. Smith
- Biomolecular Sciences Research Centre, Sheffield Hallam University, Sheffield S1 1WB, UK
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12
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Nichol T, Murrell JC, Smith TJ. Controlling the Activities of the Diiron Centre in Bacterial Monooxygenases: Lessons from Mutagenesis and Biodiversity. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tim Nichol
- Biomedical Research Centre, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, UK, http://www.shu.ac.uk/research/bmrc/staff/professor‐tom‐smith
| | - J. Colin Murrell
- School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK
| | - Thomas J. Smith
- Biomedical Research Centre, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, UK, http://www.shu.ac.uk/research/bmrc/staff/professor‐tom‐smith
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13
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Achmon Y, Fishman A. The antioxidant hydroxytyrosol: biotechnological production challenges and opportunities. Appl Microbiol Biotechnol 2014; 99:1119-30. [PMID: 25547836 DOI: 10.1007/s00253-014-6310-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 12/06/2014] [Accepted: 12/09/2014] [Indexed: 10/24/2022]
Abstract
Hydroxytyrosol (HT) is a highly potent antioxidant originating in nature as a second metabolite of plants, most abundantly in olives (Olea europaea). In the last decade, numerous research studies showed the health benefits of antioxidants in general and those of HT in particular. As olive oil is a prime constituent of the health-promoting Mediterranean diet, HT has obtained recognition for its attributes, supported by a recent health claim of the European Food Safety Authority. HT is already used as a food supplement and in cosmetic products, but it has the potential to be used as a food additive and drug, based on its anticarcinogenic, anti-inflammatory, antiapoptotic and neuroprotective activity. Nevertheless, there is a large gap between the potential of HT and its current availability in the market due to its high price tag. In this review, the challenges of producing HT using biotechnological methods are described with an emphasis on the substrate source, the biocatalyst and the process parameters, in order to narrow the gap towards an efficient bio-based industrial process.
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Affiliation(s)
- Yigal Achmon
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, 3200003, Israel
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14
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Directed evolution of nitrobenzene dioxygenase for the synthesis of the antioxidant hydroxytyrosol. Appl Microbiol Biotechnol 2014; 98:4975-85. [DOI: 10.1007/s00253-013-5505-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 12/20/2013] [Accepted: 12/26/2013] [Indexed: 01/07/2023]
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15
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Napora-Wijata K, Robins K, Osorio-Lozada A, Winkler M. Whole-Cell Carboxylate Reduction for the Synthesis of 3-Hydroxytyrosol. ChemCatChem 2014. [DOI: 10.1002/cctc.201300913] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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