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Núñez-García IC, Martínez-Ávila GCG, González-Herrera SM, Tafolla-Arellano JC, Rutiaga-Quiñones OM. Bioprospecting of endophytic fungi from semidesert candelilla (Euphorbia antisyphilitica Zucc): Potential for extracellular enzyme production. J Basic Microbiol 2024; 64:e2400049. [PMID: 38715338 DOI: 10.1002/jobm.202400049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 03/27/2024] [Accepted: 04/21/2024] [Indexed: 07/04/2024]
Abstract
Endophytic microbial communities colonize plants growing under various abiotic stress conditions. Candelilla (Euphorbia antisyphilitica Zucc.) is a shrub that develops functionally in arid and semi-arid zones of Mexico; these conditions generate an association between the plant and the microorganisms, contributing to the production of enzymes as a defense mechanism for resistance to abiotic stress. The objective of this research was to isolate and identify endophyte fungi of candelilla and bioprospection of these endophytic fungi for enzyme production using candelilla by-products. Fungi were isolated and identified using ITS1/ITS4 sequencing. Their potency index (PI) was evaluated in producing endoglucanase, xylanase, amylase, and laccase. Fermentation was carried out at 30°C for 8 days at 200 rpm, with measurements every 2 days, using candelilla by-products as substrate. All fungi exhibited higher cellulase, amylase, and laccase activities on the 2nd, 6th, and 8th day of fermentation, respectively, of fermentation. The fungus Aspergillus niger ITD-IN4.1 showed the highest amylase activity (246.84 U/mg), the genus Neurospora showed the highest cellulase activity, reaching up to 13.45 FPU/mg, and the strain Neurospora sp. ITD-IN5.2 showed the highest laccase activity (3.46 U/mg). This work provides the first report on the endophytic diversity of E. antisyphilitica and its potential role in enzyme production.
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Affiliation(s)
- Itzel C Núñez-García
- Tecnológico Nacional de México/I.T.Durango. Laboratorio Nacional CONAHCYT-LaNAEPBi, Unidad de Servicio Tecnológico Nacional de México/I.T.Durango. Depto. de Ing. Química-Bioquímica, Durango, Dgo, Mexico
| | | | - Silvia M González-Herrera
- Tecnológico Nacional de México/I.T.Durango. Laboratorio Nacional CONAHCYT-LaNAEPBi, Unidad de Servicio Tecnológico Nacional de México/I.T.Durango. Depto. de Ing. Química-Bioquímica, Durango, Dgo, Mexico
| | - Julio C Tafolla-Arellano
- Laboratorio de Biotecnología y Biología Molecular. Departamento de Ciencias Básicas, Universidad Autónoma Agraria Antonio Narro, Saltillo, Coahuila, Mexico
| | - O Miriam Rutiaga-Quiñones
- Tecnológico Nacional de México/I.T.Durango. Laboratorio Nacional CONAHCYT-LaNAEPBi, Unidad de Servicio Tecnológico Nacional de México/I.T.Durango. Depto. de Ing. Química-Bioquímica, Durango, Dgo, Mexico
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2
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Zhou M, Fakayode OA, Ren M, Li H, Liang J, Yagoub AEA, Fan Z, Zhou C. Laccase-catalyzed lignin depolymerization in deep eutectic solvents: challenges and prospects. BIORESOUR BIOPROCESS 2023; 10:21. [PMID: 38647951 PMCID: PMC10992038 DOI: 10.1186/s40643-023-00640-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 02/26/2023] [Indexed: 04/25/2024] Open
Abstract
Lignin has enormous potential as a renewable feedstock for depolymerizing to numerous high-value chemicals. However, lignin depolymerization is challenging owing to its recalcitrant, heterogenous, and limited water-soluble nature. From the standpoint of environmental friendliness and sustainability, enzymatic depolymerization of lignin is of great significance. Notably, laccases play an essential role in the enzymatic depolymerization of lignin and are considered the ultimate green catalysts. Deep eutectic solvent (DES), an efficient media in biocatalysis, are increasingly recognized as the newest and utmost green solvent that highly dissolves lignin. This review centers on a lignin depolymerization strategy by harnessing the good lignin fractionating capability of DES and the high substrate and product selectivity of laccase. Recent progress and insights into the laccase-DES interactions, protein engineering strategies for improving DES compatibility with laccase, and controlling the product selectivity of lignin degradation by laccase or in DES systems are extensively provided. Lastly, the challenges and prospects of the alliance between DES and laccase for lignin depolymerization are discussed. The collaboration of laccase and DES provides a great opportunity to develop an enzymatic route for lignin depolymerization.
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Affiliation(s)
- Man Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Olugbenga Abiola Fakayode
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China
- Department of Agricultural and Food Engineering, University of Uyo, Uyo, 520001, Akwa Ibom State, Nigeria
| | - Manni Ren
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Haoxin Li
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Jiakang Liang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | | | - Zhiliang Fan
- Biological and Agricultural Engineering Department, University of California, Davis, 95616, USA
| | - Cunshan Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China.
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3
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Lignin Valorization: Production of High Value-Added Compounds by Engineered Microorganisms. Catalysts 2023. [DOI: 10.3390/catal13030555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023] Open
Abstract
Lignin is the second most abundant polymer in nature, which is also widely generated during biomass fractionation in lignocellulose biorefineries. At present, most of technical lignin is simply burnt for energy supply although it represents the richest natural source of aromatics, and thus it is a promising feedstock for generation of value-added compounds. Lignin is heterogeneous in composition and recalcitrant to degradation, with this substantially hampering its use. Notably, microbes have evolved particular enzymes and specialized metabolic pathways to degrade this polymer and metabolize its various aromatic components. In recent years, novel pathways have been designed allowing to establish engineered microbial cell factories able to efficiently funnel the lignin degradation products into few metabolic intermediates, representing suitable starting points for the synthesis of a variety of valuable molecules. This review focuses on recent success cases (at the laboratory/pilot scale) based on systems metabolic engineering studies aimed at generating value-added and specialty chemicals, with much emphasis on the production of cis,cis-muconic acid, a building block of recognized industrial value for the synthesis of plastic materials. The upgrade of this global waste stream promises a sustainable product portfolio, which will become an industrial reality when economic issues related to process scale up will be tackled.
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Maltari R, Kontro J, Koivu K, Farooq M, Mikkilä J, Zhang R, Hildén K, Sipilä J, Nousiainen PA. Fractionation of Technical Lignin from Enzymatically Treated Steam-Exploded Poplar Using Ethanol and Formic Acid. ACS APPLIED POLYMER MATERIALS 2022; 4:9388-9398. [PMID: 36532889 PMCID: PMC9748740 DOI: 10.1021/acsapm.2c01665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 11/11/2022] [Indexed: 06/01/2023]
Abstract
Lignocellulosic biorefineries produce lignin-rich side streams with high valorization potential concealed behind their recalcitrant structure. Valorization of these residues to chemicals, materials, and fuels increases the profitability of biorefineries. Fractionation is required to reduce the lignins' structural heterogeneity for further processing. We fractionated the technical biorefinery lignin received after steam explosion and saccharification processes. More homogeneous lignin fractions were produced with high β-O-4' and aromatic content without residual carbohydrates. Non-toxic biodegradable organic solvents like ethanol and formic acid were used for fractionation and can be adapted to the existing biorefinery processes. Macromolecular properties of the isolated fractions were carefully characterized by structural, chemical, and thermal methods. The ethanol organosolv treatment produced highly soluble lignin with a reasonable yield, providing a uniform material for lignin applications. The organosolv fractionation with formic acid and combined ethanol-formic acid produced modified lignins that, based on thermal analysis, are promising as thermoresponsive materials.
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Affiliation(s)
- Riku Maltari
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
- Department
of Microbiology, University of Helsinki, P.O. Box 56, Viikinkaari 9, Helsinki FI-00014, Finland
| | - Jussi Kontro
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Klaus Koivu
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Muhammad Farooq
- Department
of Bioproducts and Biosystems, Aalto University, Vuorimiehentie 1, Espoo FI-02150, Finland
| | - Joona Mikkilä
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
- Department
of Microbiology, University of Helsinki, P.O. Box 56, Viikinkaari 9, Helsinki FI-00014, Finland
| | - Rui Zhang
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Kristiina Hildén
- Department
of Microbiology, University of Helsinki, P.O. Box 56, Viikinkaari 9, Helsinki FI-00014, Finland
| | - Jussi Sipilä
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Paula A. Nousiainen
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
- Department
of Bioproducts and Biosystems, Aalto University, Vuorimiehentie 1, Espoo FI-02150, Finland
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5
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Shen A, Luo C, Tan Y, Shen B, Liu L, Li J, Tan Z, Zeng L. A high-quality genome assembly of Lactarius hatsudake strain JH5. G3 (BETHESDA, MD.) 2022; 12:jkac262. [PMID: 36171643 PMCID: PMC9713418 DOI: 10.1093/g3journal/jkac262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 09/04/2022] [Indexed: 06/16/2023]
Abstract
Lactarius hatsudake is a species of Lactarius commonly found in pine forests, is edible with a delicious and nutritious fruiting body, and exhibits medicinal properties. It is an ideal natural multifunctional food with bioactive components including fungal polysaccharides, crude fiber, unsaturated fatty acids, nucleic acid derivatives, various amino acids, and vitamins. However, biological and genomic analyses of this mycorrhizal mushroom are sparse, thereby hindering large-scale cultivation. Previously, we isolated and screened L. hatsudake JH5 strains and have applied our garnered knowledge to the large-scale cultivation of mycorrhizal seedlings. In this study, we produced a high-quality genome assembly of L. hatsudake JH5 by combining Illumina paired-end and PacBio single molecule real-time sequencing, resulting in PacBio single molecule real-time reads of 7.67 Gb and Illumina Pair-End reads of 1,560 Mb. Based on the distribution of k-mer frequencies, the genome size of this strain was estimated to be 63.84 Mb (1.14% heterozygosity). Based on de novo genome assembly, the final genome size was determined to be 76.7 Mb, with scaffold N50 of 223.2 kb and N90 of 54.5 kb, and a GC content of 54.38%. BUSCO assessment showed that genome completeness was 89.0%. The N50 length of the JH5 genome was 43.6% longer than that of the previously published L. hatsudake MG20 genome. This high-quality L. hatsudake genome assembly will facilitate research on the functional genome, molecular breeding, yield enhancement, and sustainability of L. hatsudake cultivation.
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Affiliation(s)
- Airong Shen
- Central South University of Forestry and Technology, Changsha 410004, China
- Hunan Academy of Forestry, Changsha 410004, China
| | - Chen Luo
- Central South University of Forestry and Technology, Changsha 410004, China
| | - Yun Tan
- Hunan Academy of Forestry, Changsha 410004, China
| | - Baoming Shen
- Hunan Academy of Forestry, Changsha 410004, China
| | - Lina Liu
- Hunan Academy of Forestry, Changsha 410004, China
| | - Jilie Li
- Central South University of Forestry and Technology, Changsha 410004, China
| | - Zhuming Tan
- Hunan Academy of Forestry, Changsha 410004, China
| | - Liangbin Zeng
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China
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6
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Marinovíc M, Di Falco M, Aguilar Pontes MV, Gorzsás A, Tsang A, de Vries RP, Mäkelä MR, Hildén K. Comparative Analysis of Enzyme Production Patterns of Lignocellulose Degradation of Two White Rot Fungi: Obba rivulosa and Gelatoporia subvermispora. Biomolecules 2022; 12:biom12081017. [PMID: 35892327 PMCID: PMC9330253 DOI: 10.3390/biom12081017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/08/2022] [Accepted: 07/20/2022] [Indexed: 02/01/2023] Open
Abstract
The unique ability of basidiomycete white rot fungi to degrade all components of plant cell walls makes them indispensable organisms in the global carbon cycle. In this study, we analyzed the proteomes of two closely related white rot fungi, Obba rivulosa and Gelatoporia subvermispora, during eight-week cultivation on solid spruce wood. Plant cell wall degrading carbohydrate-active enzymes (CAZymes) represented approximately 5% of the total proteins in both species. A core set of orthologous plant cell wall degrading CAZymes was shared between these species on spruce suggesting a conserved plant biomass degradation approach in this clade of basidiomycete fungi. However, differences in time-dependent production of plant cell wall degrading enzymes may be due to differences among initial growth rates of these species on solid spruce wood. The obtained results provide insight into specific enzymes and enzyme sets that are produced during the degradation of solid spruce wood in these fungi. These findings expand the knowledge on enzyme production in nature-mimicking conditions and may contribute to the exploitation of white rot fungi and their enzymes for biotechnological applications.
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Affiliation(s)
- Mila Marinovíc
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, 00790 Helsinki, Finland; (M.M.); (M.R.M.)
| | - Marcos Di Falco
- Centre for Structural and Functional Genomics, Concordia University, Montréal, QC H4B 1R6, Canada; (M.D.F.); (A.T.)
| | - Maria Victoria Aguilar Pontes
- Fungal Physiology, Westerdijk Fungal Biodiversity Institute & Fungal Molecular Physiology, Utrecht University, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands; (M.V.A.P.); (R.P.d.V.)
| | - András Gorzsás
- Department of Chemistry, Umeå University, 901 87 Umeå, Sweden;
| | - Adrian Tsang
- Centre for Structural and Functional Genomics, Concordia University, Montréal, QC H4B 1R6, Canada; (M.D.F.); (A.T.)
| | - Ronald P. de Vries
- Fungal Physiology, Westerdijk Fungal Biodiversity Institute & Fungal Molecular Physiology, Utrecht University, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands; (M.V.A.P.); (R.P.d.V.)
| | - Miia R. Mäkelä
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, 00790 Helsinki, Finland; (M.M.); (M.R.M.)
| | - Kristiina Hildén
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, 00790 Helsinki, Finland; (M.M.); (M.R.M.)
- Correspondence:
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7
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Mattoo AJ, Nonzom S. Endophytes in Lignin Valorization: A Novel Approach. Front Bioeng Biotechnol 2022; 10:895414. [PMID: 35928943 PMCID: PMC9343868 DOI: 10.3389/fbioe.2022.895414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 06/23/2022] [Indexed: 11/29/2022] Open
Abstract
Lignin, one of the essential components of lignocellulosic biomass, comprises an abundant renewable aromatic resource on the planet earth. Although 15%––40% of lignocellulose pertains to lignin, its annual valorization rate is less than 2% which raises the concern to harness and/or develop effective technologies for its valorization. The basic hindrance lies in the structural heterogeneity, complexity, and stability of lignin that collectively makes it difficult to depolymerize and yield common products. Recently, microbial delignification, an eco-friendly and cheaper technique, has attracted the attention due to the diverse metabolisms of microbes that can channelize multiple lignin-based products into specific target compounds. Also, endophytes, a fascinating group of microbes residing asymptomatically within the plant tissues, exhibit marvellous lignin deconstruction potential. Apart from novel sources for potent and stable ligninases, endophytes share immense ability of depolymerizing lignin into desired valuable products. Despite their efficacy, ligninolytic studies on endophytes are meagre with incomplete understanding of the pathways involved at the molecular level. In the recent years, improvement of thermochemical methods has received much attention, however, we lagged in exploring the novel microbial groups for their delignification efficiency and optimization of this ability. This review summarizes the currently available knowledge about endophytic delignification potential with special emphasis on underlying mechanism of biological funnelling for the production of valuable products. It also highlights the recent advancements in developing the most intriguing methods to depolymerize lignin. Comparative account of thermochemical and biological techniques is accentuated with special emphasis on biological/microbial degradation. Exploring potent biological agents for delignification and focussing on the basic challenges in enhancing lignin valorization and overcoming them could make this renewable resource a promising tool to accomplish Sustainable Development Goals (SDG’s) which are supposed to be achieved by 2030.
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Affiliation(s)
| | - Skarma Nonzom
- *Correspondence: Skarma Nonzom, , orcid.org/0000-0001-9372-7900
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8
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Zofair SFF, Ahmad S, Hashmi MA, Khan SH, Khan MA, Younus H. Catalytic roles, immobilization and management of recalcitrant environmental pollutants by laccases: Significance in sustainable green chemistry. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 309:114676. [PMID: 35151142 DOI: 10.1016/j.jenvman.2022.114676] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 01/08/2022] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
We are facing a high risk of exposure to emerging contaminants and increasing environmental pollution with the concomitant growth of industries. Persistence of these pollutants is a major concern to the ecosystem. Laccases, also known as "green catalysts" are multi-copper oxidases which offers an eco-friendly solution for the degradation of these hazardous pollutants to less or non-toxic compounds. Although various other biological methods exist for the treatment of pollutants, the fact that laccases catalyze the oxidation of broad range of substrates in the presence of molecular oxygen without any additional cofactor and releases water as the by-product makes them exceptional. They have a good possibility of utilization in various industries, especially for the purpose of bioremediation. Besides this, they have also been used in medical/health care, food industry, bio-bleaching, wine stabilization, organic synthesis and biosensors. This review covers the catalytic behaviour of laccases, their immobilization strategies, potential applications in bioremediation of recalcitrant environmental pollutants and their engineering. It provides a comprehensive summary of most factors to consider while working with laccases in an industrial setting. It compares the benefits and drawbacks of the current techniques. Immobilization and mediators, two of the most significant aspects in working with laccases, have been meticulously discussed.
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Affiliation(s)
- Syeda Fauzia Farheen Zofair
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India
| | - Sumbul Ahmad
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India
| | - Md Amiruddin Hashmi
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India
| | - Shaheer Hasan Khan
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India
| | - Masood Alam Khan
- Department of Basic Health Sciences, College of Applied Medical Sciences, Qassim University, Buraydah, 51452, Saudi Arabia
| | - Hina Younus
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India.
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9
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Kontro J, Lyra C, Koponen M, Kuuskeri J, Kähkönen MA, Wallenius J, Wan X, Sipilä J, Mäkelä MR, Nousiainen P, Hildén K. Production of Recombinant Laccase From Coprinopsis cinerea and Its Effect in Mediator Promoted Lignin Oxidation at Neutral pH. Front Bioeng Biotechnol 2021; 9:767139. [PMID: 34858962 PMCID: PMC8630700 DOI: 10.3389/fbioe.2021.767139] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 10/26/2021] [Indexed: 11/15/2022] Open
Abstract
Laccases are multi-copper oxidases that use molecular oxygen as the electron acceptor to oxidize phenolic and indirectly also non-phenolic substrates by mechanisms involving radicals. Due to their eco-friendliness and broad substrate specificity, laccases span a wide range of biotechnological applications. We have heterologously expressed a laccase from the coprophilic basidiomycete Coprinopsis cinerea (CcLcc9) in the methylotrophic yeast Pichia pastoris. The recombinant CcLcc9 (rCcLcc9) oxidized 2,6-dimethoxyphenol in the neutral pH range, and showed thermostability up to 70°C. The rCcLcc9 efficiently oxidized veratryl alcohol to veratraldehyde in the presence of low molecular weight mediators syringyl nitrile, methyl syringate and violuric acid, which are syringyl-type plant phenolics that have shown potential as natural co-oxidants for lignocellulosic materials. In addition, rCcLcc9 is able to depolymerize biorefinery hardwood lignin in the presence of methyl syringate and syringyl nitrile as indicated by gel permeation chromatography, and infrared spectral and nucleic magnetic resonance analyses. Furthermore, we showed that several added-value aromatic compounds, such as vanillin, vanillic acid, syringaldehyde, syringic acid and p-hydroxybenzoic acid, were formed during sequential biocatalytic chemical degradation of biorefinery lignin, indicating that rCcLcc9 harbors a great potential for sustainable processes of circular economy and modern biorefineries.
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Affiliation(s)
- Jussi Kontro
- Department of Chemistry, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Christina Lyra
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Milla Koponen
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Jaana Kuuskeri
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Mika A Kähkönen
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Janne Wallenius
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Xing Wan
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Jussi Sipilä
- Department of Chemistry, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Miia R Mäkelä
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Paula Nousiainen
- Department of Chemistry, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Kristiina Hildén
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
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10
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Wallenius J, Kontro J, Lyra C, Kuuskeri J, Wan X, Kähkönen MA, Baig I, Kamer PCJ, Sipilä J, Mäkelä MR, Nousiainen P, Hildén K. Depolymerization of biorefinery lignin by improved laccases of the white-rot fungus Obba rivulosa. Microb Biotechnol 2021; 14:2140-2151. [PMID: 34310858 PMCID: PMC8449659 DOI: 10.1111/1751-7915.13896] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 06/29/2021] [Accepted: 07/04/2021] [Indexed: 11/30/2022] Open
Abstract
Fungal laccases are attracting enzymes for sustainable valorization of biorefinery lignins. To improve the lignin oxidation capacity of two previously characterized laccase isoenzymes from the white-rot fungus Obba rivulosa, we mutated their substrate-binding site at T1. As a result, the pH optimum of the recombinantly produced laccase variant rOrLcc2-D206N shifted by three units towards neutral pH. O. rivulosa laccase variants with redox mediators oxidized both the dimeric lignin model compound and biorefinery poplar lignin. Significant structural changes, such as selective benzylic α-oxidation, were detected by nuclear magnetic resonance analysis, although no polymerization of lignin was observed by gel permeation chromatography. This suggests that especially rOrLcc2-D206N is a promising candidate for lignin-related applications.
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Affiliation(s)
- Janne Wallenius
- Fungal Genetics and BiotechnologyDepartment of MicrobiologyUniversity of HelsinkiUniversity of HelsinkiBiocenter 1 PO Box 56 Viikinkaari 9HelsinkiFI‐00014Finland
| | - Jussi Kontro
- Department of ChemistryUniversity of HelsinkiP.O. Box 55 A. I. Virtasen Aukio 1HelsinkiFI‐00014Finland
| | - Christina Lyra
- Fungal Genetics and BiotechnologyDepartment of MicrobiologyUniversity of HelsinkiUniversity of HelsinkiBiocenter 1 PO Box 56 Viikinkaari 9HelsinkiFI‐00014Finland
| | - Jaana Kuuskeri
- Fungal Genetics and BiotechnologyDepartment of MicrobiologyUniversity of HelsinkiUniversity of HelsinkiBiocenter 1 PO Box 56 Viikinkaari 9HelsinkiFI‐00014Finland
| | - Xing Wan
- Fungal Genetics and BiotechnologyDepartment of MicrobiologyUniversity of HelsinkiUniversity of HelsinkiBiocenter 1 PO Box 56 Viikinkaari 9HelsinkiFI‐00014Finland
| | - Mika A. Kähkönen
- Fungal Genetics and BiotechnologyDepartment of MicrobiologyUniversity of HelsinkiUniversity of HelsinkiBiocenter 1 PO Box 56 Viikinkaari 9HelsinkiFI‐00014Finland
| | - Irshad Baig
- EaStCHEMSchool of ChemistryUniversity of St AndrewsFifeUK
- Present address:
Department of Organic Synthesis and Process ChemistryCSIR‐Indian Institute of Chemical Technology500 007Tarnaka, HyderabadIndia
| | | | - Jussi Sipilä
- Department of ChemistryUniversity of HelsinkiP.O. Box 55 A. I. Virtasen Aukio 1HelsinkiFI‐00014Finland
| | - Miia R. Mäkelä
- Fungal Genetics and BiotechnologyDepartment of MicrobiologyUniversity of HelsinkiUniversity of HelsinkiBiocenter 1 PO Box 56 Viikinkaari 9HelsinkiFI‐00014Finland
| | - Paula Nousiainen
- Department of ChemistryUniversity of HelsinkiP.O. Box 55 A. I. Virtasen Aukio 1HelsinkiFI‐00014Finland
| | - Kristiina Hildén
- Fungal Genetics and BiotechnologyDepartment of MicrobiologyUniversity of HelsinkiUniversity of HelsinkiBiocenter 1 PO Box 56 Viikinkaari 9HelsinkiFI‐00014Finland
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