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Sidar A, Voshol GP, El-Masoudi A, Vijgenboom E, Punt PJ. Streptomyces small laccase expressed in Aspergillus Niger as a new addition for the lignocellulose bioconversion toolbox. Fungal Biol Biotechnol 2024; 11:13. [PMID: 39223615 PMCID: PMC11368006 DOI: 10.1186/s40694-024-00181-6] [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: 04/17/2024] [Accepted: 08/06/2024] [Indexed: 09/04/2024] Open
Abstract
Laccases are multi-copper oxidases that are usually composed of three Cu-oxidase domains. Domains one and three house the copper binding sites, and the second domain is involved in forming a substrate-binding cleft. However, Streptomyces species are found to have small laccases (SLAC) that lack one of the three Cu-oxidase domains. This type of SLAC with interesting lignocellulose bioconversion activities has not been reported in Aspergillus niger. In our research, we explored the expression and engineering of the SLAC from Streptomyces leeuwenhoekii C34 in A. niger. Genes encoding two versions of the SLAC were expressed. One encoding the SLAC in its native form and a second encoding the SLAC fused to two N-terminal CBM1 domains. The latter is a configuration also known for specific yeast laccases. Both SLAC variants were functionally expressed in A. niger as shown by in vitro activity assays and proteome analysis. Laccase activity was also analyzed toward bioconversion of lignocellulosic rice straw. From this analysis it was clear that the SLAC activity improved the efficiency of saccharification of lignocellulosic biomass by cellulase enzyme cocktails.
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Affiliation(s)
- Andika Sidar
- Institute of Biology Leiden, Fungal Genetics and Biotechnology, Leiden University, 2333BE, Leiden, The Netherlands.
- Department of Food and Agricultural Product Technology, Gadjah Mada University, Yogyakarta, 55281, Indonesia.
| | - Gerben P Voshol
- Institute of Biology Leiden, Fungal Genetics and Biotechnology, Leiden University, 2333BE, Leiden, The Netherlands
- Genomescan, Leiden, 2333 BZ, The Netherlands
| | - Ahmed El-Masoudi
- Institute of Biology Leiden, Fungal Genetics and Biotechnology, Leiden University, 2333BE, Leiden, The Netherlands
| | - Erik Vijgenboom
- Institute of Biology Leiden, Fungal Genetics and Biotechnology, Leiden University, 2333BE, Leiden, The Netherlands
| | - Peter J Punt
- Institute of Biology Leiden, Fungal Genetics and Biotechnology, Leiden University, 2333BE, Leiden, The Netherlands.
- Ginkgo Bioworks NL, Zeist, 3704 HE, The Netherlands.
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2
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Ramamurthy K, Thomas NP, Gopi S, Sudhakaran G, Haridevamuthu B, Namasivayam KR, Arockiaraj J. Is Laccase derived from Pleurotus ostreatus effective in microplastic degradation? A critical review of current progress, challenges, and future prospects. Int J Biol Macromol 2024; 276:133971. [PMID: 39032890 DOI: 10.1016/j.ijbiomac.2024.133971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/28/2024] [Accepted: 07/16/2024] [Indexed: 07/23/2024]
Abstract
Exploration of Pleurotus ostreatus as a biological agent in the degradation of persistent plastics like polyethylene, polystyrene, polyvinyl chloride, and polyethylene terephthalate, revealing a promising avenue toward mitigating the environmental impacts of plastic pollution. Leveraging the intrinsic enzymatic capabilities of this fungus, mainly its production of laccase, presents a sustainable and eco-friendly approach to breaking down complex polymer chains into less harmful constituents. This review focused on enhancements in the strain's efficiency through genetic engineering, optimized culture conditions, and enzyme immobilization to underscore the potential for scalability and practical application of this bioremediation process. The utilization of laccase from P. ostreatus in plastic waste management demonstrates a vital step forward in pursuing sustainable environmental solutions. By using the potential of fungal bioremediation, researchers can move closer to a future in which the adverse effects of plastic pollution are significantly mitigated, benefiting the health of our planet and future generations.
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Affiliation(s)
- Karthikeyan Ramamurthy
- Toxicology and Pharmacology Laboratory, Department of Biotechnology, SRM Institute of Science and Technology, Faculty of Science and Humanities, Kattankulatur 603203, Chengalpattu District, Tamil Nadu, India
| | - N Paul Thomas
- Department of Biochemistry, SRM Institute of Science and Technology, Faculty of Science and Humanities, Kattankulatur 603203, Chengalpattu District, Tamil Nadu, India
| | - Sanjay Gopi
- Toxicology and Pharmacology Laboratory, Department of Biotechnology, SRM Institute of Science and Technology, Faculty of Science and Humanities, Kattankulatur 603203, Chengalpattu District, Tamil Nadu, India
| | - Gokul Sudhakaran
- Center for Global Health Research, Saveetha Medical College and Hospital, Saveetha Instituite of Medical and Technical Sciences, Chennai, Tamil Nadu, India
| | - B Haridevamuthu
- Toxicology and Pharmacology Laboratory, Department of Biotechnology, SRM Institute of Science and Technology, Faculty of Science and Humanities, Kattankulatur 603203, Chengalpattu District, Tamil Nadu, India
| | - Karthick Raja Namasivayam
- Centre for Applied Research, Saveetha School of Engineering, Saveetha Instituite of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai 602105, Tamil Nadu, India.
| | - Jesu Arockiaraj
- Toxicology and Pharmacology Laboratory, Department of Biotechnology, SRM Institute of Science and Technology, Faculty of Science and Humanities, Kattankulatur 603203, Chengalpattu District, Tamil Nadu, India.
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3
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Sharan AA, Bellemare A, DiFalco M, Tsang A, Vuong TV, Edwards EA, Master ER. Functional screening pipeline to uncover laccase-like multicopper oxidase enzymes that transform industrial lignins. BIORESOURCE TECHNOLOGY 2024; 393:130084. [PMID: 38000639 DOI: 10.1016/j.biortech.2023.130084] [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: 08/24/2023] [Revised: 11/07/2023] [Accepted: 11/19/2023] [Indexed: 11/26/2023]
Abstract
Laccase-like multicopper oxidases are recognized for their potential to alter the reactivity of lignins for application in value-added products. Typically, model compounds are employed to discover such enzymes; however, they do not represent the complexity of industrial lignin substrates. In this work, a screening pipeline was developed to test enzymes simultaneously on model compounds and industrial lignins. A total of 12 lignin-active fungal multicopper oxidases were discovered, including 9 enzymes active under alkaline conditions (pH 11.0). Principal component analysis revealed the poor ability of model compounds to predict enzyme performance on industrial lignins. Additionally, sequence similarity analyses grouped these enzymes with Auxiliary Activity-1 sub-families with few previously characterized members, underscoring their taxonomic novelty. Correlation between the lignin-activity of these enzymes and their taxonomic origin, however, was not observed. These are critical insights to bridge the gap between enzyme discovery and application for industrial lignin valorization.
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Affiliation(s)
- Anupama A Sharan
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada
| | - Annie Bellemare
- Centre for Structural and Functional Genomics, Concordia University, Montreal, Canada
| | - Marcos DiFalco
- Centre for Structural and Functional Genomics, Concordia University, Montreal, Canada
| | - Adrian Tsang
- Centre for Structural and Functional Genomics, Concordia University, Montreal, Canada
| | - Thu V Vuong
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada
| | - Elizabeth A Edwards
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada; Department of Cell and Systems Biology, University of Toronto, Canada
| | - Emma R Master
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Canada; Department of Bioproducts and Biosystems, Aalto University, Finland.
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Aza P, Camarero S. Fungal Laccases: Fundamentals, Engineering and Classification Update. Biomolecules 2023; 13:1716. [PMID: 38136587 PMCID: PMC10741624 DOI: 10.3390/biom13121716] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/17/2023] [Accepted: 11/20/2023] [Indexed: 12/24/2023] Open
Abstract
Multicopper oxidases (MCOs) share a common catalytic mechanism of activation by oxygen and cupredoxin-like folding, along with some common structural determinants. Laccases constitute the largest group of MCOs, with fungal laccases having the greatest biotechnological applicability due to their superior ability to oxidize a wide range of aromatic compounds and lignin, which is enhanced in the presence of redox mediators. The adaptation of these versatile enzymes to specific application processes can be achieved through the directed evolution of the recombinant enzymes. On the other hand, their substrate versatility and the low sequence homology among laccases make their exact classification difficult. Many of the ever-increasing amounts of MCO entries from fungal genomes are automatically (and often wrongly) annotated as laccases. In a recent comparative genomic study of 52 basidiomycete fungi, MCO classification was revised based on their phylogeny. The enzymes clustered according to common structural motifs and theoretical activities, revealing three novel groups of laccase-like enzymes. This review provides an overview of the structure, catalytic activity, and oxidative mechanism of fungal laccases and how their biotechnological potential as biocatalysts in industry can be greatly enhanced by protein engineering. Finally, recent information on newly identified MCOs with laccase-like activity is included.
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Affiliation(s)
| | - Susana Camarero
- Margarita Salas Center for Biological Research, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain;
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5
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Rodríguez-Escribano D, de Salas F, Pliego R, Marques G, Levée T, Suonpää A, Gutiérrez A, Martínez ÁT, Ihalainen P, Rencoret J, Camarero S. Depolymerisation of Kraft Lignin by Tailor-Made Alkaliphilic Fungal Laccases. Polymers (Basel) 2023; 15:4433. [PMID: 38006155 PMCID: PMC10675753 DOI: 10.3390/polym15224433] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 10/30/2023] [Accepted: 11/12/2023] [Indexed: 11/26/2023] Open
Abstract
Lignins released in the black liquors of kraft pulp mills are an underutilised source of aromatics. Due to their phenol oxidase activity, laccases from ligninolytic fungi are suitable biocatalysts to depolymerise kraft lignins, which are characterised by their elevated phenolic content. However, the alkaline conditions necessary to solubilise kraft lignins make it difficult to use fungal laccases whose activity is inherently acidic. We recently developed through enzyme-directed evolution high-redox potential laccases active and stable at pH 10. Here, the ability of these tailor-made alkaliphilic fungal laccases to oxidise, demethylate, and depolymerise eucalyptus kraft lignin at pH 10 is evidenced by the increment in the content of phenolic hydroxyl and carbonyl groups, the methanol released, and the appearance of lower molecular weight moieties after laccase treatment. Nonetheless, in a second assay carried out with higher enzyme and lignin concentrations, these changes were accompanied by a strong increase in the molecular weight and content of β-O-4 and β-5 linkages of the main lignin fraction, indicating that repolymerisation of the oxidised products prevails in one-pot reactions. To prevent it, we finally conducted the enzymatic reaction in a bench-scale reactor coupled to a membrane separation system and were able to prove the depolymerisation of kraft lignin by high-redox alkaliphilic laccase.
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Affiliation(s)
- David Rodríguez-Escribano
- Centro de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain; (D.R.-E.); (Á.T.M.)
| | - Felipe de Salas
- Centro de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain; (D.R.-E.); (Á.T.M.)
| | - Rocío Pliego
- Centro de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain; (D.R.-E.); (Á.T.M.)
| | - Gisela Marques
- Instituto de Recursos Naturales y Agrobiología de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC), 41012 Sevilla, Spain; (G.M.); (A.G.)
| | - Thomas Levée
- MetGen Oy, 20780 Kaarina, Finland (A.S.); (P.I.)
| | - Anu Suonpää
- MetGen Oy, 20780 Kaarina, Finland (A.S.); (P.I.)
| | - Ana Gutiérrez
- Instituto de Recursos Naturales y Agrobiología de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC), 41012 Sevilla, Spain; (G.M.); (A.G.)
| | - Ángel T. Martínez
- Centro de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain; (D.R.-E.); (Á.T.M.)
| | | | - Jorge Rencoret
- Instituto de Recursos Naturales y Agrobiología de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC), 41012 Sevilla, Spain; (G.M.); (A.G.)
| | - Susana Camarero
- Centro de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain; (D.R.-E.); (Á.T.M.)
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6
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Ali M, Bhardwaj P, Ishqi HM, Shahid M, Islam A. Laccase Engineering: Redox Potential Is Not the Only Activity-Determining Feature in the Metalloproteins. Molecules 2023; 28:6209. [PMID: 37687038 PMCID: PMC10488915 DOI: 10.3390/molecules28176209] [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: 04/09/2023] [Revised: 08/02/2023] [Accepted: 08/08/2023] [Indexed: 09/10/2023] Open
Abstract
Laccase, one of the metalloproteins, belongs to the multicopper oxidase family. It oxidizes a wide range of substrates and generates water as a sole by-product. The engineering of laccase is important to broaden their industrial and environmental applications. The general assumption is that the low redox potential of laccases is the principal obstacle, as evidenced by their low activity towards certain substrates. Therefore, the primary goal of engineering laccases is to improve their oxidation capability, thereby increasing their redox potential. Even though some of the determinants of laccase are known, it is still not entirely clear how to enhance its redox potential. However, the laccase active site has additional characteristics that regulate the enzymes' activity and specificity. These include the electrostatic and hydrophobic environment of the substrate binding pocket, the steric effect at the substrate binding site, and the orientation of the binding substrate with respect to the T1 site of the laccase. In this review, these features of the substrate binding site will be discussed to highlight their importance as a target for future laccase engineering.
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Affiliation(s)
- Misha Ali
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India; (M.A.); (P.B.)
| | - Priyanka Bhardwaj
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India; (M.A.); (P.B.)
| | - Hassan Mubarak Ishqi
- Department of Surgery and Sylvester Comprehensive Cancer Center, Miller School of Medicine, Miami, FL 33136, USA;
| | - Mohammad Shahid
- Department of Basic Medical Sciences, College of Medicine, Prince Sattam Bin Abdulaziz University, Al-Kharj 16273, Saudi Arabia
| | - Asimul Islam
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India; (M.A.); (P.B.)
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7
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Kolyadenko I, Tishchenko S, Gabdulkhakov A. Structural Insight into the Amino Acid Environment of the Two-Domain Laccase's Trinuclear Copper Cluster. Int J Mol Sci 2023; 24:11909. [PMID: 37569288 PMCID: PMC10419308 DOI: 10.3390/ijms241511909] [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: 06/09/2023] [Revised: 07/10/2023] [Accepted: 07/14/2023] [Indexed: 08/13/2023] Open
Abstract
Laccases are industrially relevant enzymes. However, their range of applications is limited by their functioning and stability. Most of the currently known laccases function in acidic conditions at temperatures below 60 °C, but two-domain laccases (2D) oxidize some substrates in alkaline conditions and above 70 °C. In this study, we aim to establish the structural factors affecting the alkaline activity of the 2D laccase from Streptomyces griseoflavus (SgfSL). The range of methods used allowed us to show that the alkaline activity of SgfSL is influenced by the polar residues located close to the trinuclear center (TNC). Structural and functional studies of the SgfSL mutants Met199Ala/Asp268Asn and Met199Gly/Asp268Asn revealed that the substitution Asp268Asn (11 Å from the TNC) affects the orientation of the Asn261 (the second coordination sphere of the TNC), resulting in hydrogen-bond-network reorganization, which leads to a change in the SgfSL-activity pH profile. The combination of the Met199Gly/Arg240His and Asp268Asn substitutions increased the efficiency (kcat/KM) of the 2,6-DMP oxidation by 34-fold compared with the SgfSL. Our results extend the knowledge about the structure and functioning of 2D laccases' TNC active sites and open up new possibilities for the directed engineering of laccases.
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Affiliation(s)
- Ilya Kolyadenko
- Institute of Protein Research RAS, 142290 Pushchino, Russia; (S.T.); (A.G.)
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8
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Karaoğlan M. Alternative secretory signal sequences for recombinant protein production in Pichia pastoris. Enzyme Microb Technol 2023; 168:110256. [PMID: 37196384 DOI: 10.1016/j.enzmictec.2023.110256] [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: 02/24/2023] [Revised: 05/09/2023] [Accepted: 05/11/2023] [Indexed: 05/19/2023]
Abstract
Extracellular protein production is primarily preferred to facilitate the downstream processes in recombinant protein production. Secretion of recombinant proteins is mediated by the processing of signal peptides in their N-terminal portion by the secretory mechanism of host expression systems. These molecular elements involved in secretion are functionally interchangeable between different species and secretion sequence screening is one of the widely used approaches to improve extracellular protein production. In this study, α-mating and protein internal repeats (PIR) secretion sequences isolated from different yeasts (Kluyveromyces lactis, Kluyveromyces marxianus and Hansenula polymorpha) were tested in Pichia pastoris for the production of two different proteins (α-amylase and xylanase) and compared with the well-known secretory signals, S. cerevisiae α-mating factor (Sc-MF) and P. pastoris protein internal repeats PIR (PpPIR). The results obtained showed the potential of signal sequences tested. Among the tested peptides, the highest yields were achieved with H. polymorpha protein internal repeats (HpPIR) and K. lactis α-mating factor (Kl-MF) for xylanase and K. marxianus protein internal repeats (KmPIR) and K. lactis α-mating factor (Kl-MF) for amylase. In further studies, these sequences can be evaluated as alternatives in the production of different proteins in P. pastoris and in the production of recombinant proteins in different expression systems.
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Affiliation(s)
- Mert Karaoğlan
- Department of Food Engineering, Erzincan Binali Yıldırım University, Erzincan, Türkiye.
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9
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Renfeld ZV, Chernykh AM, Egorova Shebanova AD, Baskunov BP, Gaidina AS, Myasoedova NM, Moiseeva OV, Kolomytseva MP. The Laccase of Myrothecium roridum VKM F-3565: A New Look at Fungal Laccase Tolerance to Neutral and Alkaline Conditions. Chembiochem 2023; 24:e202200600. [PMID: 36513608 DOI: 10.1002/cbic.202200600] [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: 10/19/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 12/15/2022]
Abstract
Most of the currently known fungal laccases show their maximum activity under acidic environmental conditions. It is known that a decrease in the activity of a typical laccase at neutral or alkaline pH values is the result of an increase in the binding of the hydroxide anion to the T2/T3 copper center, which prevents the transfer of an electron from the T1 Cu to the trinuclear copper center. However, evolutionary pressure has resolved the existing limitations in the catalytic mechanism of laccase, allowing such enzymes to be functionally active under neutral/alkaline pH conditions, thereby giving fungi an advantage for their survival. Combined molecular and biochemical studies, homological modeling, calculation of the electrostatic potential on the Connolly surface at pH 5.0 and 7.0, and structural analysis of the novel alkaliphilic laccase of Myrothecium roridum VKM F-3565 and alkaliphilic and acidophilic fungal laccases with a known structure allowed a new intramolecular channel near the one of the catalytic aspartate residues at T2-copper atom to be found. The amino acid residues of alkaliphilic laccases forming this channel can presumably serve as proton donors for catalytic aspartates under neutral conditions, thus ensuring proper functioning. For the first time for ascomycetous laccases, the production of new trimeric products of phenylpropanoid condensation under neutral conditions has been shown, which could have a potential for use in pharmacology.
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Affiliation(s)
- Zhanna V Renfeld
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
| | - Alexey M Chernykh
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
| | - Anna D Egorova Shebanova
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
| | - Boris P Baskunov
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
| | - Anastasya S Gaidina
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
| | - Nina M Myasoedova
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
| | - Olga V Moiseeva
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
| | - Marina P Kolomytseva
- G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Center for Biological Research, Russian Academy of Sciences, Prosp. Nauki 5, Pushchino, Moscow Region, 142290, Russian Federation
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10
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Madhavan A, Arun KB, Sindhu R, Nair BG, Pandey A, Awasthi MK, Szakacs G, Binod P. Design and genome engineering of microbial cell factories for efficient conversion of lignocellulose to fuel. BIORESOURCE TECHNOLOGY 2023; 370:128555. [PMID: 36586428 DOI: 10.1016/j.biortech.2022.128555] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
The gradually increasing need for fossil fuels demands renewable biofuel substitutes. This has fascinated an increasing investigation to design innovative energy fuels that have comparable Physico-chemical and combustion characteristics with fossil-derived fuels. The efficient microbes for bioenergy synthesis desire the proficiency to consume a large quantity of carbon substrate, transfer various carbohydrates through efficient metabolic pathways, capability to withstand inhibitory components and other degradation compounds, and improve metabolic fluxes to synthesize target compounds. Metabolically engineered microbes could be an efficient methodology for synthesizing biofuel from cellulosic biomass by cautiously manipulating enzymes and metabolic pathways. This review offers a comprehensive perspective on the trends and advances in metabolic and genetic engineering technologies for advanced biofuel synthesis by applying various heterologous hosts. Probable technologies include enzyme engineering, heterologous expression of multiple genes, CRISPR-Cas technologies for genome editing, and cell surface display.
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Affiliation(s)
- Aravind Madhavan
- School of Biotechnology, Amrita Vishwa Vidyapeetham, Amritapuri, Kollam 690525 Kerala, India.
| | - K B Arun
- Department of Life Sciences, CHRIST (Deemed to be University), Bengaluru 560029, Karnataka, India
| | - Raveendran Sindhu
- Department of Food Technology, TKM Institute of Technology, Kollam 689 122, India
| | - Bipin G Nair
- School of Biotechnology, Amrita Vishwa Vidyapeetham, Amritapuri, Kollam 690525 Kerala, India
| | - Ashok Pandey
- Center for Innovation and Translational Research, CSIR-Indian Institute of Toxicology Research, Lucknow 226 001, India; Sustainability Cluster, School of Engineering, University of Petroleum and Energy Studies, Dehradun 248007, Uttarkhand, India; Centre for Energy and Environmental Sustainability, Lucknow 226 029, Uttar Pradesh, India
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712 100, China
| | - George Szakacs
- Budapest University of Technology and Economics, Department of Applied Biotechnology and Food Science, 1111 Budapest, Szent Gellert ter 4, Hungary
| | - Parameswaran Binod
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, India
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11
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Multicopper oxidases with laccase-ferroxidase activity: Classification and study of ferroxidase activity determinants in a member from Heterobasidion annosum s. l.. Comput Struct Biotechnol J 2023; 21:1041-1053. [PMID: 36733701 PMCID: PMC9880977 DOI: 10.1016/j.csbj.2023.01.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 01/20/2023] [Accepted: 01/21/2023] [Indexed: 01/24/2023] Open
Abstract
Multi-copper oxidases (MCO) share a common molecular architecture and the use of copper ions as cofactors to reduce O2 to H2O, but show high sequence heterogeneity and functional diversity. Many new emerging MCO genes are wrongly annotated as laccases, the largest group of MCOs, with the widest range of biotechnological applications (particularly those from basidiomycete fungi) due to their ability to oxidise aromatic compounds and lignin. Thus, comprehensive studies for a better classification and structure-function characterisation of MCO families are required. Laccase-ferroxidases (LAC-FOXs) constitute a separate and unexplored group of MCOs with proposed dual features between laccases and ferroxidases. We aim to better define this cluster and the structural determinants underlying putative hybrid activity. We performed a phylogenetic analysis of the LAC-FOXs from basidiomycete fungi, that resulted in two subgroups. This division seemed to correlate with the presence or absence of some of the three acidic residues responsible for ferroxidase activity in Fet3p from Saccharomyces cerevisiae. One of these LAC-FOXs (with only one of these residues) from the fungus Heterobasidion annosum s. l. (HaLF) was synthesised, heterologously expressed and characterised to evaluate its catalytic activity. HaLF oxidised typical laccase substrates (phenols, aryl amines and N-heterocycles), but no Fe (II). The enzyme was subjected to site-directed mutagenesis to determine the key residues that confer ferroxidase activity. The mutated HaLF variant with full restoration of the three acidic residues exhibited efficient ferroxidase activity, while it partially retained the wide-range oxidative activity of the native enzyme associated to laccases sensu stricto.
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12
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Rodríguez-Escribano D, Pliego-Magán R, de Salas F, Aza P, Gentili P, Ihalainen P, Levée T, Meyer V, Petit-Conil M, Tapin-Lingua S, Lecourt M, Camarero S. Tailor-made alkaliphilic and thermostable fungal laccases for industrial wood processing. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2022; 15:149. [PMID: 36581887 PMCID: PMC9798632 DOI: 10.1186/s13068-022-02247-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND During the kraft process to obtain cellulosic pulp from wood, most of the lignin is removed by high-temperature alkaline cooking, released in the black liquors and usually incinerated for energy. However, kraft lignins are a valuable source of phenolic compounds that can be valorized in new bio-based products. The aim of this work is to develop laccases capable of working under the extreme conditions of high temperature and pH, typical of the industrial conversion of wood into kraft pulp and fibreboard, in order to provide extremophilic biocatalysts for depolymerising kraft lignin, and enzyme-assisted technologies for kraft pulp and fibreboard production. RESULTS Through systematic enzyme engineering, combining enzyme-directed evolution and rational design, we changed the optimal pH of the laccase for oxidation of lignin phenols from acidic to basic, enhanced the catalytic activity at alkaline pH and increased the thermal tolerance of the enzyme by accumulating up to eight mutations in the protein sequence. The extremophilic laccase variants show maximum activity at 70 °C and oxidize kraft lignin at pH 10. Their integration into industrial-type processes saves energy and chemicals. As a pre-bleaching stage, the enzymes promote kraft pulp bleachability and significantly reduce the need for chlorine dioxide compared to the industrial sequence. Their application in wood chips during fibreboard production, facilitates the defibering stage, with less energy required. CONCLUSIONS A set of new alkaliphilic and thermophilic fungal laccases has been developed to operate under the extreme conditions of high temperature and pH typical of industrial wood conversion processes. For the first time basidiomycete laccases of high-redox potential show activity on lignin-derived phenols and polymeric lignin at pH 10. Considering the extreme conditions of current industrial processes for kraft pulp and fibreboard production, the new tailor-made laccases constitute a step forward towards turning kraft pulp mills into biorefineries. Their use as biocatalysts in the wood conversion sector is expected to support the development of more environmentally sound and efficient processes, and more sustainable products.
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Affiliation(s)
| | - Rocío Pliego-Magán
- Centro de Investigaciones Biológicas Margarita Salas, CSIC. Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Felipe de Salas
- Centro de Investigaciones Biológicas Margarita Salas, CSIC. Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Pablo Aza
- Centro de Investigaciones Biológicas Margarita Salas, CSIC. Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Patrizia Gentili
- Sapienza Università Di Roma, Piazzale Aldo Moro, 5, 00185 Rome, RM Italy
| | | | - Thomas Levée
- MetGen Oy, Rakentajantie 26, 20780 Kaarina, Finland
| | - Valérie Meyer
- Centre Technique du Papier (CTP), Domaine Universitaire, 38044 Grenoble Cedex 9, France
| | - Michel Petit-Conil
- Centre Technique du Papier (CTP), Domaine Universitaire, 38044 Grenoble Cedex 9, France
| | | | - Michael Lecourt
- FCBA Institut Technologique, 341 Rue de La Papeterie, 38610 Gières, France
| | - Susana Camarero
- Centro de Investigaciones Biológicas Margarita Salas, CSIC. Ramiro de Maeztu 9, 28040 Madrid, Spain
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13
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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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14
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Brugnari T, Braga DM, Dos Santos CSA, Torres BHC, Modkovski TA, Haminiuk CWI, Maciel GM. Laccases as green and versatile biocatalysts: from lab to enzyme market-an overview. BIORESOUR BIOPROCESS 2021; 8:131. [PMID: 38650295 PMCID: PMC10991308 DOI: 10.1186/s40643-021-00484-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 12/07/2021] [Indexed: 11/10/2022] Open
Abstract
Laccases are multi-copper oxidase enzymes that catalyze the oxidation of different compounds (phenolics and non-phenolics). The scientific literature on laccases is quite extensive, including many basic and applied research about the structure, functions, mechanism of action and a variety of biotechnological applications of these versatile enzymes. Laccases can be used in various industries/sectors, from the environmental field to the cosmetics industry, including food processing and the textile industry (dyes biodegradation and synthesis). Known as eco-friendly or green enzymes, the application of laccases in biocatalytic processes represents a promising sustainable alternative to conventional methods. Due to the advantages granted by enzyme immobilization, publications on immobilized laccases increased substantially in recent years. Many patents related to the use of laccases are available, however, the real industrial or environmental use of laccases is still challenged by cost-benefit, especially concerning the feasibility of producing this enzyme on a large scale. Although this is a compelling point and the enzyme market is heated, articles on the production and application of laccases usually neglect the economic assessment of the processes. In this review, we present a description of laccases structure and mechanisms of action including the different sources (fungi, bacteria, and plants) for laccases production and tools for laccases evolution and prediction of potential substrates. In addition, we both compare approaches for scaling-up processes with an emphasis on cost reduction and productivity and critically review several immobilization methods for laccases. Following the critical view on production and immobilization, we provide a set of applications for free and immobilized laccases based on articles published within the last five years and patents which may guide future strategies for laccase use and commercialization.
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Affiliation(s)
- Tatiane Brugnari
- Biotechnology Laboratory, Department of Chemistry and Biology, Graduate Program in Environmental Science and Technology, Federal University of Technology, Paraná, Curitiba, Brazil.
| | - Dayane Moreira Braga
- Biotechnology Laboratory, Department of Chemistry and Biology, Graduate Program in Environmental Science and Technology, Federal University of Technology, Paraná, Curitiba, Brazil
| | - Camila Souza Almeida Dos Santos
- Biotechnology Laboratory, Department of Chemistry and Biology, Graduate Program in Environmental Science and Technology, Federal University of Technology, Paraná, Curitiba, Brazil
| | - Bruno Henrique Czelusniak Torres
- Biotechnology Laboratory, Department of Chemistry and Biology, Graduate Program in Environmental Science and Technology, Federal University of Technology, Paraná, Curitiba, Brazil
| | - Tatiani Andressa Modkovski
- Biotechnology Laboratory, Department of Chemistry and Biology, Graduate Program in Environmental Science and Technology, Federal University of Technology, Paraná, Curitiba, Brazil
| | - Charles Windson Isidoro Haminiuk
- Biotechnology Laboratory, Department of Chemistry and Biology, Graduate Program in Environmental Science and Technology, Federal University of Technology, Paraná, Curitiba, Brazil
| | - Giselle Maria Maciel
- Biotechnology Laboratory, Department of Chemistry and Biology, Graduate Program in Environmental Science and Technology, Federal University of Technology, Paraná, Curitiba, Brazil
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15
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Aza P, Molpeceres G, Ruiz-Dueñas FJ, Camarero S. Heterologous Expression, Engineering and Characterization of a Novel Laccase of Agrocybe pediades with Promising Properties as Biocatalyst. J Fungi (Basel) 2021; 7:359. [PMID: 34064437 PMCID: PMC8147764 DOI: 10.3390/jof7050359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/23/2021] [Accepted: 04/29/2021] [Indexed: 11/16/2022] Open
Abstract
Agaricomycetes fungi responsible for decay of wood and other lignocellulosic substrates constitute a valuable source of lignin-degrading enzymes. Among these enzymes, laccases (multi-copper oxidases) present remarkable biotechnological potential as environmentally friendly biocatalysts able to oxidize a wide range of aromatic compounds using oxygen as the only requirement. Laccases from saprotrophic Agaricales species have been much less studied than laccases from Polyporales, despite the fact that the former fungi are excellent sources of laccases. Here, the gene of a novel laccase of Agrocybe pediades, that is secreted by the fungus during lignocellulose degradation, was synthesised de novo and expressed in Saccharomyces cerevisiae using an improved signal peptide previously obtained and enzyme directed evolution. The characterization of the new laccase variants provided new insights on the contribution of different amino acid residues to modulate laccase production, catalytic activity or optimal pH. The selected double-mutated variant also showed interesting properties as a biocatalyst, such as the ability to oxidise a wide range of substrates, including high-redox potential mediators and recalcitrant organic dyes, improved activity at neutral pH and high tolerance to inhibitors. Finally, we demonstrate the existence of three N-glycosylation sites in the laccase and their distinct effect on the secretion or catalytic activity of the enzyme.
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Affiliation(s)
| | | | | | - Susana Camarero
- Centro de Investigaciones Biológicas Margarita Salas, CSIC. Ramiro de Maeztu 9, 28040 Madrid, Spain; (P.A.); (G.M.); (F.J.R.-D.)
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16
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Aza P, Molpeceres G, de Salas F, Camarero S. Design of an improved universal signal peptide based on the α-factor mating secretion signal for enzyme production in yeast. Cell Mol Life Sci 2021; 78:3691-3707. [PMID: 33687500 PMCID: PMC8038962 DOI: 10.1007/s00018-021-03793-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 02/10/2021] [Accepted: 02/18/2021] [Indexed: 11/26/2022]
Abstract
Saccharomyces cerevisiae plays an important role in the heterologous expression of an array of proteins due to its easy manipulation, low requirements and ability for protein post-translational modifications. The implementation of the preproleader secretion signal of the α-factor mating pheromone from this yeast contributes to increase the production yields by targeting the foreign protein to the extracellular environment. The use of this signal peptide combined with enzyme-directed evolution allowed us to achieve the otherwise difficult functional expression of fungal laccases in S. cerevisiae, obtaining different evolved α-factor preproleader sequences that enhance laccase secretion. However, the design of a universal signal peptide to enhance the production of heterologous proteins in S. cerevisiae is a pending challenge. We describe here the optimisation of the α-factor preproleader to improve recombinant enzyme production in S. cerevisiae through two parallel engineering strategies: a bottom-up design over the native α-factor preproleader (αnat) and a top-down design over the fittest evolved signal peptide obtained in our lab (α9H2 leader). The goal was to analyse the effect of mutations accumulated in the signal sequence throughout iterations of directed evolution, or of other reported mutations, and their possible epistatic interactions. Both approaches agreed in the positive synergism of four mutations (Aα9D, Aα20T, Lα42S, Dα83E) contained in the final optimised leader (αOPT), which notably enhanced the secretion of several fungal oxidoreductases and hydrolases. Additionally, we suggest a guideline to further drive the heterologous production of a particular enzyme based on combinatorial saturation mutagenesis of positions 86th and 87th of the αOPT leader fused to the target protein.
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Affiliation(s)
- Pablo Aza
- Centro de Investigaciones Biológicas Margarita Salas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Gonzalo Molpeceres
- Centro de Investigaciones Biológicas Margarita Salas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Felipe de Salas
- Centro de Investigaciones Biológicas Margarita Salas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Susana Camarero
- Centro de Investigaciones Biológicas Margarita Salas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain.
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17
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Aza P, de Salas F, Molpeceres G, Rodríguez-Escribano D, de la Fuente I, Camarero S. Protein Engineering Approaches to Enhance Fungal Laccase Production in S. cerevisiae. Int J Mol Sci 2021; 22:ijms22031157. [PMID: 33503813 PMCID: PMC7866195 DOI: 10.3390/ijms22031157] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/18/2021] [Accepted: 01/21/2021] [Indexed: 12/03/2022] Open
Abstract
Laccases secreted by saprotrophic basidiomycete fungi are versatile biocatalysts able to oxidize a wide range of aromatic compounds using oxygen as the sole requirement. Saccharomyces cerevisiae is a preferred host for engineering fungal laccases. To assist the difficult secretion of active enzymes by yeast, the native signal peptide is usually replaced by the preproleader of S. cerevisiae alfa mating factor (MFα1). However, in most cases, only basal enzyme levels are obtained. During directed evolution in S. cerevisiae of laccases fused to the α-factor preproleader, we demonstrated that mutations accumulated in the signal peptide notably raised enzyme secretion. Here we describe different protein engineering approaches carried out to enhance the laccase activity detected in the liquid extracts of S. cerevisiae cultures. We demonstrate the improved secretion of native and engineered laccases by using the fittest mutated α-factor preproleader obtained through successive laccase evolution campaigns in our lab. Special attention is also paid to the role of protein N-glycosylation in laccase production and properties, and to the introduction of conserved amino acids through consensus design enabling the expression of certain laccases otherwise not produced by the yeast. Finally, we revise the contribution of mutations accumulated in laccase coding sequence (CDS) during previous directed evolution campaigns that facilitate enzyme production.
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18
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Gomez-Fernandez BJ, Risso VA, Rueda A, Sanchez-Ruiz JM, Alcalde M. Ancestral Resurrection and Directed Evolution of Fungal Mesozoic Laccases. Appl Environ Microbiol 2020; 86:e00778-20. [PMID: 32414792 PMCID: PMC7357490 DOI: 10.1128/aem.00778-20] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 05/07/2020] [Indexed: 12/22/2022] Open
Abstract
Ancestral sequence reconstruction and resurrection provides useful information for protein engineering, yet its alliance with directed evolution has been little explored. In this study, we have resurrected several ancestral nodes of fungal laccases dating back ∼500 to 250 million years. Unlike modern laccases, the resurrected Mesozoic laccases were readily secreted by yeast, with similar kinetic parameters, a broader stability, and distinct pH activity profiles. The resurrected Agaricomycetes laccase carried 136 ancestral mutations, a molecular testimony to its origin, and it was subjected to directed evolution in order to improve the rate of 1,3-cyclopentanedione oxidation, a β-diketone initiator commonly used in vinyl polymerization reactions.IMPORTANCE The broad variety of biotechnological uses of fungal laccases is beyond doubt (food, textiles, pulp and paper, pharma, biofuels, cosmetics, and bioremediation), and protein engineering (in particular, directed evolution) has become the key driver for adaptation of these enzymes to harsh industrial conditions. Usually, the first requirement for directed laccase evolution is heterologous expression, which presents an important hurdle and often a time-consuming process. In this work, we resurrected a fungal Mesozoic laccase node which showed strikingly high heterologous expression and pH stability. As a proof of concept that the ancestral laccase is a suitable blueprint for engineering, we performed a quick directed evolution campaign geared to the oxidation of the β-diketone 1,3-cyclopentanedione, a poor laccase substrate that is used in the polymerization of vinyl monomers.
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Affiliation(s)
- Bernardo J Gomez-Fernandez
- Department of Biocatalysis, Institute of Catalysis and Petrochemistry, CSIC, Madrid, Spain
- EvoEnzyme, S.L., Madrid, Spain
| | - Valeria A Risso
- Departamento de Química Física, Facultad de Ciencias, Universidad de Granada, Granada, Spain
| | - Andres Rueda
- INRS-Institut Armand-Frappier, Université du Québec, Laval, Quebec, Canada
| | - Jose M Sanchez-Ruiz
- Departamento de Química Física, Facultad de Ciencias, Universidad de Granada, Granada, Spain
| | - Miguel Alcalde
- Department of Biocatalysis, Institute of Catalysis and Petrochemistry, CSIC, Madrid, Spain
- EvoEnzyme, S.L., Madrid, Spain
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19
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Gräff M, Buchholz PCF, Le Roes‐Hill M, Pleiss J. Multicopper oxidases: modular structure, sequence space, and evolutionary relationships. Proteins 2020; 88:1329-1339. [DOI: 10.1002/prot.25952] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/22/2020] [Accepted: 05/16/2020] [Indexed: 12/13/2022]
Affiliation(s)
- Maike Gräff
- Institute of Biochemistry and Technical Biochemistry, University of Stuttgart Stuttgart Germany
| | - Patrick C. F. Buchholz
- Institute of Biochemistry and Technical Biochemistry, University of Stuttgart Stuttgart Germany
| | - Marilize Le Roes‐Hill
- Applied Microbial and Health Biotechnology Institute, Cape Peninsula University of Technology Bellville South Africa
| | - Jürgen Pleiss
- Institute of Biochemistry and Technical Biochemistry, University of Stuttgart Stuttgart Germany
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20
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Gonçalves CC, Bruce T, Silva CDOG, Fillho EXF, Noronha EF, Carlquist M, Parachin NS. Bioprospecting Microbial Diversity for Lignin Valorization: Dry and Wet Screening Methods. Front Microbiol 2020; 11:1081. [PMID: 32582068 PMCID: PMC7295907 DOI: 10.3389/fmicb.2020.01081] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 04/30/2020] [Indexed: 01/02/2023] Open
Abstract
Lignin is an abundant cell wall component, and it has been used mainly for generating steam and electricity. Nevertheless, lignin valorization, i.e. the conversion of lignin into high value-added fuels, chemicals, or materials, is crucial for the full implementation of cost-effective lignocellulosic biorefineries. From this perspective, rapid screening methods are crucial for time- and resource-efficient development of novel microbial strains and enzymes with applications in the lignin biorefinery. The present review gives an overview of recent developments and applications of a vast arsenal of activity and sequence-based methodologies for uncovering novel microbial strains with ligninolytic potential, novel enzymes for lignin depolymerization and for unraveling the main metabolic routes during growth on lignin. Finally, perspectives on the use of each of the presented methods and their respective advantages and disadvantages are discussed.
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Affiliation(s)
- Carolyne Caetano Gonçalves
- Department of Genomic Science and Biotechnology, Universidade Católica de Brasília - UCB, Brasília, Brazil
| | - Thiago Bruce
- Department of Genomic Science and Biotechnology, Universidade Católica de Brasília - UCB, Brasília, Brazil
| | | | | | - Eliane Ferreira Noronha
- Laboratory of Enzymology, Department of Cellular Biology, University of Brasília, Brasília, Brazil
| | - Magnus Carlquist
- Division of Applied Microbiology, Department of Chemistry, Faculty of Engineering, Lund University, Lund, Sweden
| | - Nádia Skorupa Parachin
- Department of Genomic Science and Biotechnology, Universidade Católica de Brasília - UCB, Brasília, Brazil
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21
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Ma C, Liu M, You C, Zhu Z. Engineering a diaphorase via directed evolution for enzymatic biofuel cell application. BIORESOUR BIOPROCESS 2020. [DOI: 10.1186/s40643-020-00311-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Abstract
Background
Diaphorase (DI) has received wide attention as the key anodic enzyme mediating the electron transfer and electric energy generation in enzymatic biofuel cells (EBFCs). Lowering the anodic pH may be a useful strategy for constructing high-performance in EBFCs. However, most DI suffered from the poor activity at low pHs. Therefore, it is necessary to modify the activity and its acidic tolerance to further improve the performance of the EBFC.
Results
This paper attempts to improve the enzyme activity of DI originated from Geobacillus stearothermophilus under acidic conditions through directed evolution. Three rounds of random mutagenesis by error-prone PCR of the GsDI gene followed by high-throughput screening allowed the identification of the mutant 3–8 (H37Q, S73T, F105L, S68T, G61S, D74V) exhibiting a 4- or 7-fold increase in the catalytic activity at pH 5.4 or 4.5 compared to that of the wild type. And the pH stability of mutant 3–8 was significantly better than that of wild type and showed a 1.3 times higher in the stability at pH 5.4. The EBFC anode equipped with 0.5 mg of mutant 3–8 achieved a maximum current of 40 μA at pH 5.4, much higher than that with the same loading of the wild type enzyme.
Conclusion
The GsDI has been improved in the specific activity and pH stability by directed evolution which leads to the improvement of the EBFC performance. Also, the enlarged catalytic channel of mutant and decreased B-factor may be beneficial for the activity and stability. These results suggest that this engineered DI will be a useful candidate for the construction of enhanced EBFCs.
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22
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Kajiwara K, Aoki W, Ueda M. Evaluation of the yeast surface display system for screening of functional nanobodies. AMB Express 2020; 10:51. [PMID: 32180052 PMCID: PMC7076106 DOI: 10.1186/s13568-020-00983-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 03/02/2020] [Indexed: 11/10/2022] Open
Abstract
Yeast surface display is a powerful technology used to isolate and engineer proteins to improve their activity, specificity, and stability. In this method, gene expression is regulated by promoters, and secretion efficiency is affected by secretion signals. Furthermore, both the accessibility and activity of the displayed proteins are affected by the length of anchor proteins. The ideal promoter, secretion signal, and anchor protein combination depend on the proteins of interest. In this study, we optimized a yeast surface display suitable for nanobody evaluation. We designed five display systems that used different combinations of promoters, secretion signals, and anchor proteins. Anti-hen egg-white lysozyme nanobody was used as the model nanobody. The amount of nanobodies displayed on yeast cells, the number of antigens bound to the displayed nanobodies, and the display efficiency were quantified. Overall, we improved the yeast display system for nanobody engineering and proposed its optimization.
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23
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Kwiatos N, Jędrzejczak-Krzepkowska M, Krzemińska A, Delavari A, Paneth P, Bielecki S. Evolved Fusarium oxysporum laccase expressed in Saccharomyces cerevisiae. Sci Rep 2020; 10:3244. [PMID: 32094483 PMCID: PMC7039978 DOI: 10.1038/s41598-020-60204-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 01/14/2020] [Indexed: 02/06/2023] Open
Abstract
Fusarium oxysporum laccase was functionally expressed in Saccharomyces cerevisiae and engineered towards higher expression levels and higher reactivity towards 2,6-dimethoxyphenol, that could be used as a mediator for lignin modification. A combination of classical culture optimization and protein engineering led to around 30 times higher activity in the culture supernatant. The winner mutant exhibited three times lower Km, four times higher kcat and ten times higher catalytic efficiency than the parental enzyme. The strategy for laccase engineering was composed of a combination of random methods with a rational approach based on QM/MM MD studies of the enzyme complex with 2,6-dimethoxyphenol. Laccase mediator system with 2,6-dimethoxyphenol caused fulvic acids release from biosolubilized coal.
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Affiliation(s)
- Natalia Kwiatos
- Institute of Technical Biochemistry, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Stefanowskiego 4/10, 90-924, Lodz, Poland
| | - Marzena Jędrzejczak-Krzepkowska
- Institute of Technical Biochemistry, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Stefanowskiego 4/10, 90-924, Lodz, Poland
| | - Agnieszka Krzemińska
- Institute of Physics, Lodz University of Technology, Wólczańska 219, 90-924, Lodz, Poland
| | | | - Piotr Paneth
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Wróblewskiego 15, 93-590, Lodz, Poland
| | - Stanisław Bielecki
- Institute of Technical Biochemistry, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Stefanowskiego 4/10, 90-924, Lodz, Poland.
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24
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Chan JC, Paice M, Zhang X. Enzymatic Oxidation of Lignin: Challenges and Barriers Toward Practical Applications. ChemCatChem 2019. [DOI: 10.1002/cctc.201901480] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jou C. Chan
- Voiland School of Chemical Engineering and Bioengineering Washington State University 2710 Crimson Way Richland WA-99354 USA
| | - Michael Paice
- FPInnovations Pulp Paper & Bioproducts 2665 East Mall Vancouver BC V6T 1Z4 Canada
| | - Xiao Zhang
- Voiland School of Chemical Engineering and Bioengineering Washington State University 2710 Crimson Way Richland WA-99354 USA
- Pacific Northwest National Laboratory 520 Battelle Boulevard P.O. Box 999, MSIN P8-60 Richland WA-99352 USA
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Arregui L, Ayala M, Gómez-Gil X, Gutiérrez-Soto G, Hernández-Luna CE, Herrera de los Santos M, Levin L, Rojo-Domínguez A, Romero-Martínez D, Saparrat MCN, Trujillo-Roldán MA, Valdez-Cruz NA. Laccases: structure, function, and potential application in water bioremediation. Microb Cell Fact 2019; 18:200. [PMID: 31727078 PMCID: PMC6854816 DOI: 10.1186/s12934-019-1248-0] [Citation(s) in RCA: 189] [Impact Index Per Article: 37.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Accepted: 10/31/2019] [Indexed: 11/11/2022] Open
Abstract
The global rise in urbanization and industrial activity has led to the production and incorporation of foreign contaminant molecules into ecosystems, distorting them and impacting human and animal health. Physical, chemical, and biological strategies have been adopted to eliminate these contaminants from water bodies under anthropogenic stress. Biotechnological processes involving microorganisms and enzymes have been used for this purpose; specifically, laccases, which are broad spectrum biocatalysts, have been used to degrade several compounds, such as those that can be found in the effluents from industries and hospitals. Laccases have shown high potential in the biotransformation of diverse pollutants using crude enzyme extracts or free enzymes. However, their application in bioremediation and water treatment at a large scale is limited by the complex composition and high salt concentration and pH values of contaminated media that affect protein stability, recovery and recycling. These issues are also associated with operational problems and the necessity of large-scale production of laccase. Hence, more knowledge on the molecular characteristics of water bodies is required to identify and develop new laccases that can be used under complex conditions and to develop novel strategies and processes to achieve their efficient application in treating contaminated water. Recently, stability, efficiency, separation and reuse issues have been overcome by the immobilization of enzymes and development of novel biocatalytic materials. This review provides recent information on laccases from different sources, their structures and biochemical properties, mechanisms of action, and application in the bioremediation and biotransformation of contaminant molecules in water. Moreover, we discuss a series of improvements that have been attempted for better organic solvent tolerance, thermo-tolerance, and operational stability of laccases, as per process requirements.
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Affiliation(s)
- Leticia Arregui
- Departamento de Ciencias Naturales, Universidad Autónoma Metropolitana, Unidad Cuajimalpa, Av. Vasco de Quiroga 4871, Col. Santa Fe Cuajimalpa, C.P. 05348 Mexico City, Mexico
| | - Marcela Ayala
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001 Chamilpa, 62210 Cuernavaca, Morelos Mexico
| | - Ximena Gómez-Gil
- Programa de Investigación de Producción de Biomoléculas, Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, AP. 70228, Mexico City, CP. 04510 Mexico
| | - Guadalupe Gutiérrez-Soto
- Facultad de Agronomía, Universidad Autónoma de Nuevo León, Francisco Villa, 66059 Colonia Ex hacienda El Canadá, General Escobedo, Nuevo León Mexico
| | - Carlos Eduardo Hernández-Luna
- Laboratorio de Enzimología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Pedro de Alba y Manuel L. Barragán, Cd. Universitaria, 66451 San Nicolás de los Garza, Nuevo León Mexico
| | - Mayra Herrera de los Santos
- Programa de Investigación de Producción de Biomoléculas, Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, AP. 70228, Mexico City, CP. 04510 Mexico
| | - Laura Levin
- Laboratorio de Micología Experimental, DBBE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, INMIBO-CONICET, Ciudad Universitaria, Pabellón 2, Piso 4, C1428BGA Ciudad Autónoma de Buenos Aires, Argentina
| | - Arturo Rojo-Domínguez
- Departamento de Ciencias Naturales, Universidad Autónoma Metropolitana, Unidad Cuajimalpa, Av. Vasco de Quiroga 4871, Col. Santa Fe Cuajimalpa, C.P. 05348 Mexico City, Mexico
| | - Daniel Romero-Martínez
- Programa de Investigación de Producción de Biomoléculas, Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, AP. 70228, Mexico City, CP. 04510 Mexico
| | - Mario C. N. Saparrat
- Instituto de Fisiología Vegetal (INFIVE), Universidad Nacional de La Plata (UNLP)-CCT-La Plata-Consejo Nacional de Investigaciones Científicas y técnicas (CONICET), Diag. 113 y 61, 327CC, 1900, La Plata, Argentina
- Instituto de Botánica Spegazzini, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, 53 # 477, 1900, La Plata, Argentina
| | - Mauricio A. Trujillo-Roldán
- Programa de Investigación de Producción de Biomoléculas, Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, AP. 70228, Mexico City, CP. 04510 Mexico
| | - Norma A. Valdez-Cruz
- Programa de Investigación de Producción de Biomoléculas, Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, AP. 70228, Mexico City, CP. 04510 Mexico
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Li C, Chen C, Wu X, Tsang CW, Mou J, Yan J, Liu Y, Lin CSK. Recent advancement in lignin biorefinery: With special focus on enzymatic degradation and valorization. BIORESOURCE TECHNOLOGY 2019; 291:121898. [PMID: 31395402 DOI: 10.1016/j.biortech.2019.121898] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/22/2019] [Accepted: 07/23/2019] [Indexed: 05/07/2023]
Abstract
With the intensive development of lignocellulosic biorefineries to produce fuels and chemicals from biomass-derived carbohydrates, lignin was generated at a large quantity every year. Therefore, lignin has received increasing attention as an abundant aromatics resource in terms of research and development efforts for value-added chemicals production. In this review, studies about lignin degradation especially the crucial enzymes involved and the reaction mechanism were substantially discussed, which provided the molecular basis of lignin biodegradation. Then, the latest improvements in lignin valorization by biological methods were summarized and case studies about value-added compounds from lignin were introduced. Afterwards, challenges, opportunities and prospects regarding biorefinery of lignin were presented.
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Affiliation(s)
- Chong Li
- Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, Guangdong 518120, People's Republic of China
| | - Chao Chen
- BioZone, Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON M5S 3E5, Canada
| | - Xiaofen Wu
- Hunan Institute of Nuclear Agricultural Science and Space Breeding, Hunan Academy of Agricultural Sciences, Changsha, Hunan 410125, People's Republic of China
| | - Chi-Wing Tsang
- Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong, Hong Kong, China
| | - Jinhua Mou
- School of Energy and Environment, City University of Hong Kong, Hong Kong
| | - Jianbin Yan
- Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, Guangdong 518120, People's Republic of China
| | - Yun Liu
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Carol Sze Ki Lin
- School of Energy and Environment, City University of Hong Kong, Hong Kong.
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Liu Y, Wu Y, Zhang Y, Yang X, Yang E, Xu H, Yang Q, Chagan I, Cui X, Chen W, Yan J. Lignin degradation potential and draft genome sequence of Trametes trogii S0301. BIOTECHNOLOGY FOR BIOFUELS 2019; 12:256. [PMID: 31687044 PMCID: PMC6820987 DOI: 10.1186/s13068-019-1596-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 10/18/2019] [Indexed: 05/07/2023]
Abstract
BACKGROUND Trametes trogii is a member of the white-rot fungi family, which has a unique ability to break down recalcitrant lignin polymers to CO2 and water, and they have enormous potential to biodegrade a wide range of toxic environmental pollutants. Because of its industrial potential, the identification of lignin-degrading enzyme systems in Trametes is an important area of research. Development and utilization of industrial value genes are suffering due to deficiency knowledge of genome available for their manipulation. RESULTS In the present study, Homokaryotic strains of T. trogii S0301 were screened and sequencing by PacBio Sequel II platform. The final draft genome is ~ 39.88 Mb, with a contig N50 size of 2.4 Mb, this was the first genome sequencing and assembly of T. trogii species. Further analyses predicted 14,508 protein-coding genes. Results showed that T. trogii S0301 contains 602 genes encoding CAZymes, include 211 glycoside hydrolase and 117 lignin-degrading family genes, nine laccases related genes. Small subunit ribosomal RNA gene (18S rRNA) sequencing confirms its phylogenetic position. Moreover, T. trogii S0301 has the largest number of cytochromes P450 (CYPs) superfamily genes compare to other fungi. All these results are consistent with enzymatic assays and transcriptome analysis results. We also analyzed other genome characteristics in the T. trogii S0301genome. CONCLUSION Here, we present a nearly complete genome for T. trogii S0301, which will help elucidate the biosynthetic pathways of the lignin-degrading enzyme, advancing the discovery, characterization, and modification of novel enzymes from this genus. This genome sequence will provide a valuable reference for the investigation of lignin degradation in the Trametes genus.
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Affiliation(s)
- Yuan Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
- Yunnan Provincial Key Laboratory of Panax notoginseng, Kunming, 650500 China
- Key Laboratory of Panax notoginseng Resources Sustainable Development and Utilization of State Administration of Traditional Chinese Medicine, Kunming, 650500 China
- Kunming Key Laboratory of Sustainable Development and Utilization of Famous-Region Drug, Kunming, 650500 China
| | - Yuanyuan Wu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
| | - Yu Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
| | - Xulei Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
| | - En Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
| | - Huini Xu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
| | - Qiliang Yang
- Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
| | - Irbis Chagan
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
| | - Xiuming Cui
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
- Yunnan Provincial Key Laboratory of Panax notoginseng, Kunming, 650500 China
- Key Laboratory of Panax notoginseng Resources Sustainable Development and Utilization of State Administration of Traditional Chinese Medicine, Kunming, 650500 China
- Kunming Key Laboratory of Sustainable Development and Utilization of Famous-Region Drug, Kunming, 650500 China
| | - Weimin Chen
- Biotechnology and Germplasm Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, 650223 Yunnan China
| | - Jinping Yan
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500 Yunnan China
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Directed evolution of a 6-phosphogluconate dehydrogenase for operating an enzymatic fuel cell at lowered anodic pHs. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113444] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Structural and biochemical insights into an engineered high-redox potential laccase overproduced in Aspergillus. Int J Biol Macromol 2019; 141:855-867. [PMID: 31505206 DOI: 10.1016/j.ijbiomac.2019.09.052] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 08/27/2019] [Accepted: 09/06/2019] [Indexed: 02/07/2023]
Abstract
Fungal laccases have great potential as biocatalysts oxidizing a variety of aromatic compounds using oxygen as co-substrate. Here, the crystal structure of 7D5 laccase (PDB 6H5Y), developed in Saccharomyces cerevisiae and overproduced in Aspergillus oryzae, is compared with that of the wild type produced by basidiomycete PM1 (Coriolopsis sp.), PDB 5ANH. SAXS showed both enzymes form monomers in solution, 7D5 laccase with a more oblate geometric structure due to heavier and more heterogeneous glycosylation. The enzyme presents superior catalytic constants towards all tested substrates, with no significant change in optimal pH or redox potential. It shows noticeable high catalytic efficiency with ABTS and dimethyl-4-phenylenediamine, 7 and 32 times better than the wild type, respectively. Computational simulations demonstrated a more favorable binding and electron transfer from the substrate to the T1 copper due to the introduced mutations. PM1 laccase is exceptionally stable to thermal inactivation (t1/2 70 °C = 1.2 h). Yet, both enzymes display outstanding structural robustness at high temperature. They keep folded during 2 h at 100 °C though, thereafter, 7D5 laccase unfolds faster. Rigidification of certain loops due to the mutations added on the protein surface would diminish the capability to absorb temperature fluctuations leading to earlier protein unfolding.
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Ribeiro LF, Amarelle V, Alves LDF, Viana de Siqueira GM, Lovate GL, Borelli TC, Guazzaroni ME. Genetically Engineered Proteins to Improve Biomass Conversion: New Advances and Challenges for Tailoring Biocatalysts. Molecules 2019; 24:molecules24162879. [PMID: 31398877 PMCID: PMC6719137 DOI: 10.3390/molecules24162879] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 07/30/2019] [Accepted: 08/06/2019] [Indexed: 01/02/2023] Open
Abstract
Protein engineering emerged as a powerful approach to generate more robust and efficient biocatalysts for bio-based economy applications, an alternative to ecologically toxic chemistries that rely on petroleum. On the quest for environmentally friendly technologies, sustainable and low-cost resources such as lignocellulosic plant-derived biomass are being used for the production of biofuels and fine chemicals. Since most of the enzymes used in the biorefinery industry act in suboptimal conditions, modification of their catalytic properties through protein rational design and in vitro evolution techniques allows the improvement of enzymatic parameters such as specificity, activity, efficiency, secretability, and stability, leading to better yields in the production lines. This review focuses on the current application of protein engineering techniques for improving the catalytic performance of enzymes used to break down lignocellulosic polymers. We discuss the use of both classical and modern methods reported in the literature in the last five years that allowed the boosting of biocatalysts for biomass degradation.
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Affiliation(s)
- Lucas Ferreira Ribeiro
- Department of Biology, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto 14040-901, Brazil.
| | - Vanesa Amarelle
- Department of Microbial Biochemistry and Genomics, Biological Research Institute Clemente Estable, Montevideo, PC 11600, Uruguay
| | - Luana de Fátima Alves
- Department of Biochemistry and Immunology, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto 14049-900, Brazil
| | | | - Gabriel Lencioni Lovate
- Department of Biochemistry and Immunology, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto 14049-900, Brazil
| | - Tiago Cabral Borelli
- Department of Biology, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto 14040-901, Brazil
| | - María-Eugenia Guazzaroni
- Department of Biology, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto 14040-901, Brazil.
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Singh G, Arya SK. Utility of laccase in pulp and paper industry: A progressive step towards the green technology. Int J Biol Macromol 2019; 134:1070-1084. [DOI: 10.1016/j.ijbiomac.2019.05.168] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 05/22/2019] [Accepted: 05/22/2019] [Indexed: 01/31/2023]
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Mateljak I, Rice A, Yang K, Tron T, Alcalde M. The Generation of Thermostable Fungal Laccase Chimeras by SCHEMA-RASPP Structure-Guided Recombination in Vivo. ACS Synth Biol 2019; 8:833-843. [PMID: 30897903 DOI: 10.1021/acssynbio.8b00509] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Fungal laccases are biotechnologically relevant enzymes that are capable of oxidizing a wide array of compounds, using oxygen from the air and releasing water as the only byproduct. The laccase structure is comprised of three cupredoxin domains sheltering two copper centers-the T1Cu site and the T2/T3 trinuclear Cu cluster-connected to each other through a highly conserved internal electron transfer pathway. As such, the generation of laccase chimeras with high sequence diversity from different orthologs is difficult to achieve without compromising protein functionality. Here, we have obtained a diverse family of functional chimeras showing increased thermostability from three fungal laccase orthologs with ∼70% protein sequence identity. Assisted by the high frequency of homologous DNA recombination in Saccharomyces cerevisiae, computationally selected SCHEMA-RASPP blocks were spliced and cloned in a one-pot transformation. As a result of this in vivo assembly, an enriched library of laccase chimeras was rapidly generated, with multiple recombination events simultaneously occurring between and within the SCHEMA blocks. The resulting library was screened at high temperature, identifying a collection of thermostable chimeras with considerable sequence diversity, which varied from their closest parent homologue by 46 amino acids on average. The most thermostable variant increased its half-life of thermal inactivation at 70 °C 5-fold (up to 108 min), whereas several chimeras also displayed improved stability at acidic pH. The two catalytic copper sites spanned different SCHEMA blocks, shedding light on the recognition of specific residues involved in substrate oxidation. In summary, this case-study, through comparison with previous laccase engineering studies, highlights the benefits of bringing together computationally guided recombination and in vivo shuffling as an invaluable strategy for laccase evolution, which can be translated to other enzyme systems.
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Affiliation(s)
- Ivan Mateljak
- Department of Biocatalysis, Institute of Catalysis, CSIC, Cantoblanco, 28049 Madrid, Spain
| | - Austin Rice
- Division of Chemistry and Chemical Engineering, California Institute of Technology, CALTECH, Pasadena, California 91125-4100, United States
| | - Kevin Yang
- Division of Chemistry and Chemical Engineering, California Institute of Technology, CALTECH, Pasadena, California 91125-4100, United States
| | - Thierry Tron
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313, 13397 Marseille, France
| | - Miguel Alcalde
- Department of Biocatalysis, Institute of Catalysis, CSIC, Cantoblanco, 28049 Madrid, Spain
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Novoa C, Dhoke GV, Mate DM, Martínez R, Haarmann T, Schreiter M, Eidner J, Schwerdtfeger R, Lorenz P, Davari MD, Jakob F, Schwaneberg U. KnowVolution of a Fungal Laccase toward Alkaline pH. Chembiochem 2019; 20:1458-1466. [DOI: 10.1002/cbic.201800807] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Catalina Novoa
- DWI Leibniz Institute for Interactive Materials Forckenbeckstrasse 50 52056 Aachen Germany
| | - Gaurao V. Dhoke
- Institute of BiotechnologyRWTH Aachen University Worringerweg 3 52074 Aachen Germany
| | - Diana M. Mate
- DWI Leibniz Institute for Interactive Materials Forckenbeckstrasse 50 52056 Aachen Germany
- Present address: Center of Molecular Biology “Severo Ochoa”Universidad Autónoma de Madrid Nicolás Cabrera 1 28049 Madrid Spain
| | - Ronny Martínez
- Institute of BiotechnologyRWTH Aachen University Worringerweg 3 52074 Aachen Germany
- Present address: Departamento de Ingeniería en AlimentosInstituto de Investigación Multidisciplinario en Ciencia y TecnologíaUniversidad de La Serena Raúl Bitrán 1305 1720010 La Serena Chile
| | | | | | - Jasmin Eidner
- IAB Enzymes GmbH Feldbergstrasse 78 64293 Darmstadt Germany
| | | | - Patrick Lorenz
- IAB Enzymes GmbH Feldbergstrasse 78 64293 Darmstadt Germany
| | - Mehdi D. Davari
- Institute of BiotechnologyRWTH Aachen University Worringerweg 3 52074 Aachen Germany
| | - Felix Jakob
- DWI Leibniz Institute for Interactive Materials Forckenbeckstrasse 50 52056 Aachen Germany
- Institute of BiotechnologyRWTH Aachen University Worringerweg 3 52074 Aachen Germany
| | - Ulrich Schwaneberg
- DWI Leibniz Institute for Interactive Materials Forckenbeckstrasse 50 52056 Aachen Germany
- Institute of BiotechnologyRWTH Aachen University Worringerweg 3 52074 Aachen Germany
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Rodríguez-Couto S. Fungal Laccase: A Versatile Enzyme for Biotechnological Applications. ACTA ACUST UNITED AC 2019. [DOI: 10.1007/978-3-030-10480-1_13] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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de Paula RG, Antoniêto ACC, Ribeiro LFC, Srivastava N, O'Donovan A, Mishra PK, Gupta VK, Silva RN. Engineered microbial host selection for value-added bioproducts from lignocellulose. Biotechnol Adv 2019; 37:107347. [PMID: 30771467 DOI: 10.1016/j.biotechadv.2019.02.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Revised: 01/27/2019] [Accepted: 02/08/2019] [Indexed: 12/12/2022]
Abstract
Lignocellulose is a rich and sustainable globally available carbon source and is considered a prominent alternative raw material for producing biofuels and valuable chemical compounds. Enzymatic hydrolysis is one of the crucial steps of lignocellulose degradation. Cellulolytic and hemicellulolytic enzyme mixes produced by different microorganisms including filamentous fungi, yeasts and bacteria, are used to degrade the biomass to liberate monosaccharides and other compounds for fermentation or conversion to value-added products. During biomass pretreatment and degradation, toxic compounds are produced, and undesirable carbon catabolic repression (CCR) can occur. In order to solve this problem, microbial metabolic pathways and transcription factors involved have been investigated along with the application of protein engineering to optimize the biorefinery platform. Engineered Microorganisms have been used to produce specific enzymes to breakdown biomass polymers and metabolize sugars to produce ethanol as well other biochemical compounds. Protein engineering strategies have been used for modifying lignocellulolytic enzymes to overcome enzymatic limitations and improving both their production and functionality. Furthermore, promoters and transcription factors, which are key proteins in this process, are modified to promote microbial gene expression that allows a maximum performance of the hydrolytic enzymes for lignocellulosic degradation. The present review will present a critical discussion and highlight the aspects of the use of microorganisms to convert lignocellulose into value-added bioproduct as well combat the bottlenecks to make the biorefinery platform from lignocellulose attractive to the market.
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Affiliation(s)
- Renato Graciano de Paula
- Department of Biochemistry and Immunology, Ribeirao Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | | | - Liliane Fraga Costa Ribeiro
- Department of Biochemistry and Immunology, Ribeirao Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Neha Srivastava
- Department of Chemical Engineering & Technology, IIT (BHU), Varanasi 221005, U.P, India
| | - Anthonia O'Donovan
- School of Science and Computing, Galway-Mayo Institute of Technology, Galway, Ireland
| | - P K Mishra
- Department of Chemical Engineering & Technology, IIT (BHU), Varanasi 221005, U.P, India
| | - Vijai K Gupta
- ERA Chair of Green Chemistry, Department of Chemistry and Biotechnology, Tallinn University of Technology, 12618 Tallinn, Estonia.
| | - Roberto N Silva
- Department of Biochemistry and Immunology, Ribeirao Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
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A highly stable laccase obtained by swapping the second cupredoxin domain. Sci Rep 2018; 8:15669. [PMID: 30353103 PMCID: PMC6199291 DOI: 10.1038/s41598-018-34008-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 10/10/2018] [Indexed: 11/08/2022] Open
Abstract
The robustness of a high-redox potential laccase has been enhanced by swapping its second cupredoxin domain with that from another fungal laccase, which introduced a pool of neutral mutations in the protein sequence without affecting enzyme functionality. The new laccase showed outstanding stability to temperature, pH (2-9) and to organic solvents, while maintaining the ability to oxidize high-redox potential substrates. By engineering the signal peptide, enzyme secretion levels in Saccharomyces cerevisiae were increased, which allowed to purify the engineered enzyme for further characterization. The purified domain-swap laccase presented higher activity in the presence of ethanol or methanol, superior half-lives at 50-70 °C, improved stability at acidic pH, and similar catalytic efficiency for DMP albeit a lower one for ABTS (due to a shift in optimum pH). A new N-glycosylation site and a putative new surface salt-bridge were evaluated as possible determinants for the improved stability by site-directed mutagenesis. Although neither seemed to be strictly responsible for the improved thermostability, the new salt bridge was found to notably contribute to the high stability of the swapped enzyme in a broad pH range. Finally, the application potential of the new laccase was demonstrated with the enzymatic treatment of kraft lignin, an industrially relevant lignin stream, at high temperature, neutral pH and short incubation times.
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Directed Evolution of a Homodimeric Laccase from Cerrena unicolor BBP6 by Random Mutagenesis and In Vivo Assembly. Int J Mol Sci 2018; 19:ijms19102989. [PMID: 30274366 PMCID: PMC6213006 DOI: 10.3390/ijms19102989] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 09/19/2018] [Accepted: 09/27/2018] [Indexed: 11/21/2022] Open
Abstract
Laccases have great potential for industrial applications due to their green catalytic properties and broad substrate specificities, and various studies have attempted to improve the catalytic performance of these enzymes. Here, to the best of our knowledge, we firstly report the directed evolution of a homodimeric laccase from Cerrena unicolor BBP6 fused with α-factor prepro-leader that was engineered through random mutagenesis followed by in vivo assembly in Saccharomyces cerevisiae. Three evolved fusion variants selected from ~3500 clones presented 31- to 37-fold increases in total laccase activity, with better thermostability and broader pH profiles. The evolved α-factor prepro-leader enhanced laccase expression levels by up to 2.4-fold. Protein model analysis of these variants reveals that the beneficial mutations have influences on protein pKa shift, subunit interaction, substrate entrance, and C-terminal function.
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Kwiatos N, Jędrzejczak-Krzepkowska M, Strzelecki B, Bielecki S. Improvement of efficiency of brown coal biosolubilization by novel recombinant Fusarium oxysporum laccase. AMB Express 2018; 8:133. [PMID: 30136100 PMCID: PMC6104410 DOI: 10.1186/s13568-018-0669-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 08/17/2018] [Indexed: 11/10/2022] Open
Abstract
Clean coal technologies (e.g. coal biosolubilization) are of essential value, especially in Europe, where coal is the national wealth and other energy sources like crude oil are not available. Fusarium oxysporum LOCK 1134, the strain isolated from brown coal, efficiently biosolubilizes lignite. The obtained liquefied products contain 50% less sulfur and over 99% less mercury than the crude coal. Moreover, the liquefied coal can be modified further by laccase. In this study F. oxysporum laccase was expressed in Pichia pastoris for the first time and was assessed as an additional agent for coal degradation. The novel laccase contributes to humic and fulvic acids release from liquefied coal due to introduction of oxygen into coal structure. The effect is increased when a natural redox mediator, sinapic acid, is present in the reaction mixture-up to 30% and 80% respectively. Humic acids obtained by biological process are environmentally friendly fertilizers that may have stimulating effects on crop growth.
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Avelar M, Pastor N, Ramirez-Ramirez J, Ayala M. Replacement of oxidizable residues predicted by QM-MM simulation of a fungal laccase generates variants with higher operational stability. J Inorg Biochem 2018; 178:125-133. [DOI: 10.1016/j.jinorgbio.2017.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 10/09/2017] [Accepted: 10/10/2017] [Indexed: 11/28/2022]
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Zhou S, Rousselot-Pailley P, Ren L, Charmasson Y, Dezord EC, Robert V, Tron T, Mekmouche Y. Production and manipulation of blue copper oxidases for technological applications. Methods Enzymol 2018; 613:17-61. [DOI: 10.1016/bs.mie.2018.10.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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41
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Yue Q, Yang Y, Zhao J, Zhang L, Xu L, Chu X, Liu X, Tian J, Wu N. Identification of bacterial laccase cueO mutation from the metagenome of chemical plant sludge. BIORESOUR BIOPROCESS 2017. [DOI: 10.1186/s40643-017-0178-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mateljak I, Tron T, Alcalde M. Evolved α-factor prepro-leaders for directed laccase evolution in Saccharomyces cerevisiae. Microb Biotechnol 2017; 10:1830-1836. [PMID: 28805314 PMCID: PMC5658585 DOI: 10.1111/1751-7915.12838] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 07/06/2017] [Accepted: 07/13/2017] [Indexed: 11/28/2022] Open
Abstract
Although the functional expression of fungal laccases in Saccharomyces cerevisiae has proven to be complicated, the replacement of signal peptides appears to be a suitable approach to enhance secretion in directed evolution experiments. In this study, twelve constructs were prepared by fusing native and evolved α-factor prepro-leaders from S. cerevisiae to four different laccases with low-, medium- and high-redox potential (PM1L from basidiomycete PM1; PcL from Pycnoporus cinnabarinus; TspC30L from Trametes sp. strain C30; and MtL from Myceliophthora thermophila). Microcultures of the prepro-leader:laccase fusions were grown in selective expression medium that used galactose as both the sole carbon source and as the inducer of expression so that the secretion and activity were assessed with low- and high-redox potential mediators in a high-throughput screening context. With total activity improvements as high as sevenfold over those obtained with the native α-factor prepro-leader, the evolved prepro-leader from PcL (αPcL ) most strongly enhanced secretion of the high- and medium-redox potential laccases PcL, PM1L and TspC30L in the microtiter format with an expression pattern driven by prepro-leaders in the order αPcL > αPM1L ~ αnative . By contrast, the pattern of the low-redox potential MtL was αnative > αPcL > αPM1L . When produced in flask with rich medium, the evolved prepro-leaders outperformed the αnative signal peptide irrespective of the laccase attached, enhancing secretion over 50-fold. Together, these results highlight the importance of using evolved α-factor prepro-leaders for functional expression of fungal laccases in directed evolution campaigns.
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Affiliation(s)
- Ivan Mateljak
- Department of BiocatalysisInstitute of CatalysisCSICCantoblanco28049MadridSpain
| | - Thierry Tron
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 731313397MarseilleFrance
| | - Miguel Alcalde
- Department of BiocatalysisInstitute of CatalysisCSICCantoblanco28049MadridSpain
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Efficient secretion of three fungal laccases fromSaccharomyces cerevisiaeand their potential for decolorization of textile industry effluent-A comparative study. Biotechnol Prog 2017; 34:69-80. [DOI: 10.1002/btpr.2559] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 07/18/2017] [Indexed: 11/07/2022]
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Iimura Y, Sonoki T, Habe H. Heterologous expression of Trametes versicolor laccase in Saccharomyces cerevisiae. Protein Expr Purif 2017; 141:39-43. [PMID: 28918197 DOI: 10.1016/j.pep.2017.09.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 09/09/2017] [Accepted: 09/11/2017] [Indexed: 02/06/2023]
Abstract
Laccase is used in various industrial fields, and it has been the subject of numerous studies. Trametes versicolor laccase has one of the highest redox potentials among the various forms of this enzyme. In this study, we optimized the expression of laccase in Saccharomyces cerevisiae. Optimizing the culture conditions resulted in an improvement in the expression level, and approximately 45 U/L of laccase was functionally secreted in the culture. The recombinant laccase was found to be a heavily hypermannosylated glycoprotein, and the molecular weight of the carbohydrate chain was approximately 60 kDa. These hypermannosylated glycans lowered the substrate affinity, but the optimum pH and thermo-stability were not changed by these hypermannosylated glycans. This functional expression system described here will aid in molecular evolutionary studies conducted to generate new variants of laccase.
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Affiliation(s)
- Yosuke Iimura
- Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan.
| | - Tomonori Sonoki
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Hiroshi Habe
- Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
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Rodríguez-Escribano D, de Salas F, Pardo I, Camarero S. High-Throughput Screening Assay for Laccase Engineering toward Lignosulfonate Valorization. Int J Mol Sci 2017; 18:E1793. [PMID: 28820431 PMCID: PMC5578181 DOI: 10.3390/ijms18081793] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 08/09/2017] [Accepted: 08/11/2017] [Indexed: 11/17/2022] Open
Abstract
Lignin valorization is a pending issue for the integrated conversion of lignocellulose in consumer goods. Lignosulfonates (LS) are the main technical lignins commercialized today. However, their molecular weight should be enlarged to meet application requirements as additives or dispersing agents. Oxidation of lignosulfonates with fungal oxidoreductases, such as laccases, can increase the molecular weight of lignosulfonates by the cross-linking of lignin phenols. To advance in this direction, we describe here the development of a high-throughput screening (HTS) assay for the directed evolution of laccases, with lignosulfonate as substrate and the Folin-Ciocalteau reagent (FCR), to detect the decrease in phenolic content produced upon polymerization of lignosulfonate by the enzyme. Once the reaction conditions were adjusted to the 96-well-plate format, the enzyme for validating the assay was selected from a battery of high-redox-potential laccase variants functionally expressed in S. cerevisiae (the preferred host for the directed evolution of fungal oxidoreductases). The colorimetric response (absorbance at 760 nm) correlated with laccase activity secreted by the yeast. The HTS assay was reproducible (coefficient of variation (CV) = 15%) and sensitive enough to detect subtle differences in activity among yeast clones expressing a laccase mutant library obtained by error-prone PCR (epPCR). The method is therefore feasible for screening thousands of clones during the precise engineering of laccases toward valorization of lignosulfonates.
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Affiliation(s)
| | - Felipe de Salas
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain.
| | - Isabel Pardo
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain.
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA.
| | - Susana Camarero
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain.
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Avelar M, Olvera C, Aceves-Zamudio D, Folch JL, Ayala M. Recombinant expression of a laccase from Coriolopsis gallica in Pichia pastoris using a modified α-factor preproleader. Protein Expr Purif 2017; 136:14-19. [PMID: 28602730 DOI: 10.1016/j.pep.2017.06.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/27/2017] [Accepted: 06/03/2017] [Indexed: 11/28/2022]
Abstract
In this work we communicate the heterologous expression of a laccase from Coriolopsis gallica in Pichia pastoris. This enzyme has been reported to efficiently degrade a variety of pollutants such as industrial dyes. The expression strategy included using a previously reported modified α-factor preproleader for enhanced secretion and pAOX1, a methanol-responsive promoter. Methanol concentration, copper salts concentration and temperature were varied in order to enhance laccase expression in this heterologous system. A volumetric activity of 250 U/L was achieved after 12-day culture in Fernbach flasks. The protein was recovered from the supernatant and purified, obtaining a preparation with 90% electrophoretic purity. The catalytic constants of the recombinant enzyme are almost identical to the fungal enzyme, thus rendering this system a useful tool for protein engineering of laccase from C. gallica.
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Affiliation(s)
- Mayra Avelar
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología UNAM, Av. Universidad 2001 Chamilpa, 62210 Cuernavaca, Morelos, Mexico
| | - Clarita Olvera
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología UNAM, Av. Universidad 2001 Chamilpa, 62210 Cuernavaca, Morelos, Mexico
| | - Denise Aceves-Zamudio
- Centro de Investigación en Biotecnología UAEM, Av. Universidad 2001 Chamilpa, 62210 Cuernavaca, Morelos, Mexico
| | - Jorge Luis Folch
- Centro de Investigación en Biotecnología UAEM, Av. Universidad 2001 Chamilpa, 62210 Cuernavaca, Morelos, Mexico
| | - Marcela Ayala
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología UNAM, Av. Universidad 2001 Chamilpa, 62210 Cuernavaca, Morelos, Mexico.
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Bertrand B, Martínez-Morales F, Trejo-Hernández MR. Upgrading Laccase Production and Biochemical Properties: Strategies and Challenges. Biotechnol Prog 2017; 33:1015-1034. [PMID: 28393483 DOI: 10.1002/btpr.2482] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 03/31/2017] [Indexed: 12/22/2022]
Abstract
Improving laccases continues to be crucial in novel biotechnological developments and industrial applications, where they are concerned. This review breaks down and explores the potential of the strategies (conventional and modern) that can be used for laccase enhancement (increased production and upgraded biochemical properties such as stability and catalytic efficiency). The challenges faced with these approaches are briefly discussed. We also shed light on how these strategies merge and give rise to new options and advances in this field of work. Additionally, this article seeks to serve as a guide for students and academic researchers interested in laccases. This document not only gives basic information on laccases, but also provides updated information on the state of the art of various technologies that are used in this line of investigation. It also gives the readers an idea of the areas extensively studied and the areas where there is still much left to be done. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:1015-1034, 2017.
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Affiliation(s)
- Brandt Bertrand
- Department of Environmental Biotechnology, Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa, Cuernavaca, Morelos, CP 62209, México
| | - Fernando Martínez-Morales
- Department of Environmental Biotechnology, Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa, Cuernavaca, Morelos, CP 62209, México
| | - María R Trejo-Hernández
- Department of Environmental Biotechnology, Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa, Cuernavaca, Morelos, CP 62209, México
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Abstract
Laccases are multi-copper oxidoreductases which catalyze the oxidation of a wide range of substrates during the simultaneous reduction of oxygen to water. These enzymes, originally found in fungi, plants, and other natural sources, have many industrial and biotechnological applications. They are used in the food, textile, pulp, and paper industries, as well as for bioremediation purposes. Although natural hosts can provide relatively high levels of active laccases after production optimization, heterologous expression can bring, moreover, engineered enzymes with desired properties, such as different substrate specificity or improved stability. Hence, diverse hosts suitable for laccase production are reviewed here, while the greatest emphasis is placed on yeasts which are commonly used for industrial production of various proteins. Different approaches to optimize the laccase expression and activity are also discussed in detail here.
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Affiliation(s)
- Zuzana Antošová
- Department of Membrane Transport, Institute of Physiology, Czech Academy of Sciences (CAS), Vídeňská 1083, 142 20, Prague 4, Czech Republic.
| | - Hana Sychrová
- Department of Membrane Transport, Institute of Physiology, Czech Academy of Sciences (CAS), Vídeňská 1083, 142 20, Prague 4, Czech Republic.
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Vicente AI, Viña-Gonzalez J, Santos-Moriano P, Marquez-Alvarez C, Ballesteros AO, Alcalde M. Evolved alkaline fungal laccase secreted by Saccharomyces cerevisiae as useful tool for the synthesis of C–N heteropolymeric dye. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.10.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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50
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de Salas F, Pardo I, Salavagione HJ, Aza P, Amougi E, Vind J, Martínez AT, Camarero S. Advanced Synthesis of Conductive Polyaniline Using Laccase as Biocatalyst. PLoS One 2016; 11:e0164958. [PMID: 27741301 PMCID: PMC5065195 DOI: 10.1371/journal.pone.0164958] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 10/04/2016] [Indexed: 11/18/2022] Open
Abstract
Polyaniline is a conductive polymer with distinctive optical and electrical properties. Its enzymatic synthesis is an environmentally friendly alternative to the use of harsh oxidants and extremely acidic conditions. 7D5L, a high-redox potential laccase developed in our lab, is the biocatalyst of choice for the synthesis of green polyaniline (emeraldine salt) due to its superior ability to oxidize aniline and kinetic stability at the required polymerization conditions (pH 3 and presence of anionic surfactants) as compared with other fungal laccases. Doses as low as 7.6 nM of 7D5L catalyze the polymerization of 15 mM aniline (in 24 h, room temperature, 7% yield) in the presence of different anionic surfactants used as doping templates to provide linear and water-soluble polymers. Aniline polymerization was monitored by the increase of the polaron absorption band at 800 nm (typical for emeraldine salt). Best polymerization results were obtained with 5 mM sodium dodecylbenzenesulfonate (SDBS) as template. At fixed conditions (15 mM aniline and 5mM SDBS), polymerization rates obtained with 7D5L were 2.5-fold the rates obtained with commercial Trametes villosa laccase. Moreover, polyaniline yield was notably boosted to 75% by rising 7D5L amount to 0.15 μM, obtaining 1g of green polyaniline in 1L-reaction volume. The green polymer obtained with the selected system (7D5L/SDBS) holds excellent electrochemical and electro-conductive properties displayed in water-dispersible nanofibers, which is advantageous for the nanomaterial to be readily cast into uniform films for different applications.
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Affiliation(s)
- Felipe de Salas
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Isabel Pardo
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Horacio J. Salavagione
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006, Madrid, Spain
| | - Pablo Aza
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Eleni Amougi
- Novozymes A/S Krogshoejvej 36, 2880, Bagsvaerd, Denmark
| | - Jesper Vind
- Novozymes A/S Krogshoejvej 36, 2880, Bagsvaerd, Denmark
| | - Angel T. Martínez
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Susana Camarero
- Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
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