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Streptomyces swartbergensis sp. nov., a novel tyrosinase and antibiotic producing actinobacterium. Antonie van Leeuwenhoek 2017; 111:589-600. [PMID: 29110155 DOI: 10.1007/s10482-017-0979-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2017] [Accepted: 11/01/2017] [Indexed: 10/18/2022]
Abstract
As part of an antibiotic screening program, an actinobacterium, strain HMC13T, was isolated from soil collected from the banks of the Gamka River, Western Cape Province, South Africa. The isolate was found to produce branched mycelia that differentiated into spiral spore chains with spiny spores. 16S rRNA gene sequence analysis showed the strain to be closely related to Streptomyces caelestis NRRL 2418T (99.72%) and Streptomyces azureus NBRC 12744T (99.51%). Chemotaxonomic analyses confirmed the classification of the strain as a member of the genus Streptomyces: LL-DAP in the peptidoglycan, no diagnostic sugars in the whole cell sugar pattern, dominant menaquinones including MK9(H8), MK9(H6), and the polar lipids detected included phosphatidylethanolamine. The fatty acid profile revealed the presence of mostly branched, saturated fatty acids: iso-C15:0 (14.4%), anteiso-C15:0 (21.1%), iso-C16:0 (16.8%), C16:1ω7c/2-OH iso-C15:0 (5.8%), C16:0 (6.2%), iso-C17:1ω9c (5.8%), iso-C17:0 (5.9%), and anteiso-C17:0 (9.6%). Strain HMC13T is a tyrosinase producer and exhibits very strong antibiosis against Mycobacterium aurum A+ and Staphylococcus aureus subsp. aureus ATCC 33591 (methicillin resistant), while only weak activity was observed against Bacillus cereus ATCC 10876, Enterococcus faecium VanA (vancomycin resistant), Enterococcus faecalis ATCC 51299 (vancomycin resistant) and Candida tropicalis ATCC 750T. Strain HMC13T (= LMG 28849T = NRRL B-65294T) is proposed as the type strain of a new species, to be named Streptomyces swartbergensis sp. nov.
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Kolomytseva M, Myasoedova N, Samoilova A, Podieiablonskaia E, Chernykh A, Classen T, Pietruszka J, Golovleva L. Rapid identification of fungal laccases/oxidases with different pH-optimum. Process Biochem 2017. [DOI: 10.1016/j.procbio.2017.07.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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54
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Improving the Indigo Carmine Decolorization Ability of a Bacillus amyloliquefaciens Laccase by Site-Directed Mutagenesis. Catalysts 2017. [DOI: 10.3390/catal7090275] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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55
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Dias AA, Matos AJ, Fraga I, Sampaio A, Bezerra RM. An Easy Method for Screening and Detection of Laccase Activity. ACTA ACUST UNITED AC 2017. [DOI: 10.2174/1874070701711010089] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Objective:
An instrument-free assay was developed for simultaneous detection of laccase activity in a large number of samples as diverse as screening of laccase-producing microbial cultures or chromatographic fractions.
Method:
Dried paper discs previously impregnated with 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) were placed on a flat-bottom microplate (a simple way to avoid misidentification) and loaded with an aliquot from each sample.
Results:
Discs corresponding to samples containing laccase activity become green-bluish colored within first ten minutes of reaction, allowing direct detection through simple naked-eye inspection.
Conclusion:
As an example, this easy process was applied to the laccase purification in order to eliminate chromatographic fractions that did not contain laccase activity, thus reducing the number of spectrophotometric assays.
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Wang J, Lu L, Feng F. Combined strategies for improving production of a thermo-alkali stable laccase in Pichia pastoris. ELECTRON J BIOTECHN 2017. [DOI: 10.1016/j.ejbt.2017.04.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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57
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Yang J, Li W, Ng TB, Deng X, Lin J, Ye X. Laccases: Production, Expression Regulation, and Applications in Pharmaceutical Biodegradation. Front Microbiol 2017; 8:832. [PMID: 28559880 PMCID: PMC5432550 DOI: 10.3389/fmicb.2017.00832] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 04/24/2017] [Indexed: 01/08/2023] Open
Abstract
Laccases are a family of copper-containing oxidases with important applications in bioremediation and other various industrial and biotechnological areas. There have been over two dozen reviews on laccases since 2010 covering various aspects of this group of versatile enzymes, from their occurrence, biochemical properties, and expression to immobilization and applications. This review is not intended to be all-encompassing; instead, we highlighted some of the latest developments in basic and applied laccase research with an emphasis on laccase-mediated bioremediation of pharmaceuticals, especially antibiotics. Pharmaceuticals are a broad class of emerging organic contaminants that are recalcitrant and prevalent. The recent surge in the relevant literature justifies a short review on the topic. Since low laccase yields in natural and genetically modified hosts constitute a bottleneck to industrial-scale applications, we also accentuated a genus of laccase-producing white-rot fungi, Cerrena, and included a discussion with regards to regulation of laccase expression.
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Affiliation(s)
- Jie Yang
- Fujian Key Laboratory of Marine Enzyme Engineering, Fuzhou UniversityFujian, China
| | - Wenjuan Li
- Fujian Key Laboratory of Marine Enzyme Engineering, Fuzhou UniversityFujian, China
| | - Tzi Bun Ng
- Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong KongShatin, Hong Kong
| | - Xiangzhen Deng
- Fujian Key Laboratory of Marine Enzyme Engineering, Fuzhou UniversityFujian, China
| | - Juan Lin
- Fujian Key Laboratory of Marine Enzyme Engineering, Fuzhou UniversityFujian, China
| | - Xiuyun Ye
- Fujian Key Laboratory of Marine Enzyme Engineering, Fuzhou UniversityFujian, China
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58
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Siroosi M, Amoozegar MA, Khajeh K. Purification and characterization of an alkaline chloride-tolerant laccase from a halotolerant bacterium, Bacillus sp. strain WT. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.10.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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59
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60
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de Gonzalo G, Colpa DI, Habib MH, Fraaije MW. Bacterial enzymes involved in lignin degradation. J Biotechnol 2016; 236:110-9. [DOI: 10.1016/j.jbiotec.2016.08.011] [Citation(s) in RCA: 315] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 08/16/2016] [Indexed: 01/01/2023]
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61
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Davidi L, Moraïs S, Artzi L, Knop D, Hadar Y, Arfi Y, Bayer EA. Toward combined delignification and saccharification of wheat straw by a laccase-containing designer cellulosome. Proc Natl Acad Sci U S A 2016; 113:10854-9. [PMID: 27621442 PMCID: PMC5047212 DOI: 10.1073/pnas.1608012113] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Efficient breakdown of lignocellulose polymers into simple molecules is a key technological bottleneck limiting the production of plant-derived biofuels and chemicals. In nature, plant biomass degradation is achieved by the action of a wide range of microbial enzymes. In aerobic microorganisms, these enzymes are secreted as discrete elements in contrast to certain anaerobic bacteria, where they are assembled into large multienzyme complexes termed cellulosomes. These complexes allow for very efficient hydrolysis of cellulose and hemicellulose due to the spatial proximity of synergistically acting enzymes and to the limited diffusion of the enzymes and their products. Recently, designer cellulosomes have been developed to incorporate foreign enzymatic activities in cellulosomes so as to enhance lignocellulose hydrolysis further. In this study, we complemented a cellulosome active on cellulose and hemicellulose by addition of an enzyme active on lignin. To do so, we designed a dockerin-fused variant of a recently characterized laccase from the aerobic bacterium Thermobifida fusca The resultant chimera exhibited activity levels similar to the wild-type enzyme and properly integrated into the designer cellulosome. The resulting complex yielded a twofold increase in the amount of reducing sugars released from wheat straw compared with the same system lacking the laccase. The unorthodox use of aerobic enzymes in designer cellulosome machinery effects simultaneous degradation of the three major components of the plant cell wall (cellulose, hemicellulose, and lignin), paving the way for more efficient lignocellulose conversion into soluble sugars en route to alternative fuels production.
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Affiliation(s)
- Lital Davidi
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sarah Moraïs
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Lior Artzi
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Doriv Knop
- Faculty of Agricultural, Food, and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Yitzhak Hadar
- Faculty of Agricultural, Food, and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Yonathan Arfi
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Edward A Bayer
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel;
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62
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Koyani RD, Vazquez-Duhalt R. Laccase encapsulation in chitosan nanoparticles enhances the protein stability against microbial degradation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:18850-18857. [PMID: 27318485 DOI: 10.1007/s11356-016-7072-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 06/13/2016] [Indexed: 06/06/2023]
Abstract
A novel concept with the result of enzyme stabilization against microbial degradation in real bioremediation processes was developed through the encapsulation of laccase in chitosan nanoparticles. Besides of abundant information on laccase-chitosan conjugates, we report the laccase encapsulation into nanoparticles based in chitosan. The chitosan-tripolyphosphate technique was applied for the production of morphologically homogeneous enzymatic nanoparticles, with high enzyme encapsulation efficiency, small asymmetric sizes (from 40 to 90 nm), and rough surfaces. Contrary to macroscopic immobilized enzymes, temperature and pH activity profiles of nano-sized laccase were similar to those of free enzyme. The substrate affinity constant (K M) of nano-encapsulated laccase was similar to these from free enzyme, while its activity rate constant (k cat) represented 60 % of these obtained with free enzyme. Importantly, stability of nano-encapsulated laccase against microbial degradation in soil, compost, and wastewater was significantly increased. After 24 h exposure to wastewater from a treatment plant, the laccase activity of the nanoparticles was 82.8 % of initial activity, compared with only 7.8 % retained activity for free enzyme. After 36 h incubation in compost extract, the laccase nanoparticles showed 72.4 % of the initial activity, while the free enzyme was almost completely inactivated. Finally, after 84 h incubation in soil extract, the nanoparticles and free preparations showed 57.9 and 17.3 % of the initial activity, respectively. Thus, the nanoencapsulation of enzymes able to transform pollutants is an alternative to improve the operational lifetime of enzymes in real environmental applications.
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Affiliation(s)
- Rina D Koyani
- Department of Bionanotechnology, Centro de Nanociencias y Nanotecnologia, Universidad Nacional Autónoma de México, Km 107 carretera Tijuana-Ensenada, Ensenada, Baja California, 22860, Mexico
| | - Rafael Vazquez-Duhalt
- Department of Bionanotechnology, Centro de Nanociencias y Nanotecnologia, Universidad Nacional Autónoma de México, Km 107 carretera Tijuana-Ensenada, Ensenada, Baja California, 22860, Mexico.
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63
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Zhang Y, Li X, Hao Z, Xi R, Cai Y, Liao X. Hydrogen Peroxide-Resistant CotA and YjqC of Bacillus altitudinis Spores Are a Promising Biocatalyst for Catalyzing Reduction of Sinapic Acid and Sinapine in Rapeseed Meal. PLoS One 2016; 11:e0158351. [PMID: 27362423 PMCID: PMC4928806 DOI: 10.1371/journal.pone.0158351] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Accepted: 06/14/2016] [Indexed: 11/19/2022] Open
Abstract
For the more efficient detoxification of phenolic compounds, a promising avenue would be to develop a multi-enzyme biocatalyst comprising peroxidase, laccase and other oxidases. However, the development of this multi-enzyme biocatalyst is limited by the vulnerability of fungal laccases and peroxidases to hydrogen peroxide (H2O2)-induced inactivation. Therefore, H2O2-resistant peroxidase and laccase should be exploited. In this study, H2O2-stable CotA and YjqC were isolated from the outer coat of Bacillus altitudinis SYBC hb4 spores. In addition to the thermal and alkali stability of catalytic activity, CotA also exhibited a much higher H2O2 tolerance than fungal laccases from Trametes versicolor and Trametes trogii. YjqC is a sporulation-related manganese (Mn) catalase with striking peroxidase activity for sinapic acid (SA) and sinapine (SNP). In contrast to the typical heme-containing peroxidases, the peroxidase activity of YjqC was also highly resistant to inhibition by H2O2 and heat. CotA could also catalyze the oxidation of SA and SNP. CotA had a much higher affinity for SA than B. subtilis CotA. CotA and YjqC rendered from B. altitudinis spores had promising laccase and peroxidase activities for SA and SNP. Specifically, the B. altitudinis spores could be regarded as a multi-enzyme biocatalyst composed of CotA and YjqC. The B. altitudinis spores were efficient for catalyzing the degradation of SA and SNP in rapeseed meal. Moreover, efficiency of the spore-catalyzed degradation of SA and SNP was greatly improved by the presence of 15 mM H2O2. This effect was largely attributed to synergistic biocatalysis of the H2O2-resistant CotA and YjqC toward SA and SNP.
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Affiliation(s)
- Yanzhou Zhang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China
| | - Xunhang Li
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China
- The Bioscience and Engineering College, Jiangxi Agriculture University, Nanchang, 330045, China
| | - Zhikui Hao
- Institute of Applied Biotechnology, Taizhou Vocational & Technical College, Taizhou, 318000, China
| | - Ruchun Xi
- College of Forestry, South China Agricultural University, Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, Guangzhou, 510642, China
| | - Yujie Cai
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China
| | - Xiangru Liao
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China
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64
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Uncovering the Transmembrane Metal Binding Site of the Novel Bacterial Major Facilitator Superfamily-Type Copper Importer CcoA. mBio 2016; 7:e01981-15. [PMID: 26787831 PMCID: PMC4725013 DOI: 10.1128/mbio.01981-15] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Uptake and trafficking of metals and their delivery to their respective metalloproteins are important processes. Cells need precise control of each step to avoid exposure to excessive metal concentrations and their harmful consequences. Copper (Cu) is a required micronutrient used as a cofactor in proteins. However, in large amounts, it can induce oxidative damage; hence, Cu homeostasis is indispensable for cell survival. Biogenesis of respiratory heme-Cu oxygen (HCO) reductases includes insertion of Cu into their catalytic subunits to form heme-Cu binuclear centers. Previously, we had shown that CcoA is a major facilitator superfamily (MFS)-type bacterial Cu importer required for biogenesis of cbb3-type cytochrome c oxidase (cbb3-Cox). Here, using Rhodobacter capsulatus, we focused on the import and delivery of Cu to cbb3-Cox. By comparing the CcoA amino acid sequence with its homologues from other bacterial species, we located several well-conserved Met, His, and Tyr residues that might be important for Cu transport. We determined the topology of the transmembrane helices that carry these residues to establish that they are membrane embedded, and substituted for them amino acids that do not ligand metal atoms. Characterization of these mutants for their uptake of radioactive 64Cu and cbb3-Cox activities demonstrated that Met233 and His261 of CcoA are essential and Met237 and Met265 are important, whereas Tyr230 has no role for Cu uptake or cbb3-Cox biogenesis. These findings show for the first time that CcoA-mediated Cu import relies on conserved Met and His residues that could act as metal ligands at the membrane-embedded Cu binding domain of this transporter. Cu is a micronutrient that is both essential and toxic; hence, its cellular homeostasis is crucial. Respiratory cbb3-type cytochrome c oxidases (cbb3-Cox) are Cu-containing energy-transducing enzymes that are important for many microaerophilic processes, including photosynthesis, respiration, and bacterial pathogenesis. How Cu is incorporated into cbb3-Cox enzymes is not well known. So far, CcoA is the only known major facilitator superfamily (MFS)-type transporter required for Cu import into the bacterial cytoplasm and for cbb3-Cox biogenesis. This study shows that the membrane-embedded, universally conserved Met and His residues of CcoA are essential for its Cu import function and also for its role in cbb3-Cox biogenesis, shedding light on the mechanism of function of this bacterial prototypical Cu importer.
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65
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Aston JE, Apel WA, Lee BD, Thompson DN, Lacey JA, Newby DT, Reed DW, Thompson VS. Degradation of phenolic compounds by the lignocellulose deconstructing thermoacidophilic bacterium Alicyclobacillus Acidocaldarius. ACTA ACUST UNITED AC 2016; 43:13-23. [DOI: 10.1007/s10295-015-1700-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 10/01/2015] [Indexed: 10/22/2022]
Abstract
Abstract
Alicyclobacillus acidocaldarius, a thermoacidophilic bacterium, has a repertoire of thermo- and acid-stable enzymes that deconstruct lignocellulosic compounds. The work presented here describes the ability of A. acidocaldarius to reduce the concentration of the phenolic compounds: phenol, ferulic acid, ρ-coumaric acid and sinapinic acid during growth conditions. The extent and rate of the removal of these compounds were significantly increased by the presence of micro-molar copper concentrations, suggesting activity by copper oxidases that have been identified in the genome of A. acidocaldarius. Substrate removal kinetics was first order for phenol, ferulic acid, ρ-coumaric acid and sinapinic acid in the presence of 50 μM copper sulfate. In addition, laccase enzyme assays of cellular protein fractions suggested significant activity on a lignin analog between the temperatures of 45 and 90 °C. This work shows the potential for A. acidocaldarius to degrade phenolic compounds, demonstrating potential relevance to biofuel production and other industrial processes.
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Affiliation(s)
- John E Aston
- grid.417824.c 0000000100207392 Biological and Chemical Processing Department Idaho National Laboratory Idaho Falls ID USA
| | - William A Apel
- grid.417824.c 0000000100207392 Biological and Chemical Processing Department Idaho National Laboratory Idaho Falls ID USA
| | - Brady D Lee
- grid.451303.0 0000000122183491 Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA USA
| | - David N Thompson
- grid.417824.c 0000000100207392 Biological and Chemical Processing Department Idaho National Laboratory Idaho Falls ID USA
| | - Jeffrey A Lacey
- grid.417824.c 0000000100207392 Biological and Chemical Processing Department Idaho National Laboratory Idaho Falls ID USA
| | - Deborah T Newby
- grid.417824.c 0000000100207392 Biological and Chemical Processing Department Idaho National Laboratory Idaho Falls ID USA
| | - David W Reed
- grid.417824.c 0000000100207392 Biological and Chemical Processing Department Idaho National Laboratory Idaho Falls ID USA
| | - Vicki S Thompson
- grid.417824.c 0000000100207392 Biological and Chemical Processing Department Idaho National Laboratory Idaho Falls ID USA
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66
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Wang J, Feng J, Jia W, Chang S, Li S, Li Y. Lignin engineering through laccase modification: a promising field for energy plant improvement. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:145. [PMID: 26379777 PMCID: PMC4570640 DOI: 10.1186/s13068-015-0331-y] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 09/01/2015] [Indexed: 05/05/2023]
Abstract
Laccase (p-diphenol:dioxygen oxidoreductase, EC 1.10.3.2) is a member of the multicopper oxidases and catalyzes the one-electron oxidation of a wide range of substrates, coupled with the reduction of oxygen to water. It is widely distributed in bacteria, fungi, plants and insects. Laccases are encoded by multigene family, and have been characterized mostly from fungi till now, with abundant industrial applications in pulp and paper, textile, food industries, organic synthesis, bioremediation and nanobiotechnology, while limited researches have been performed in plants, and no application has been reported. Plant laccases share the common molecular architecture and reaction mechanism with fungal ones, despite of difference in redox potential and pH optima. Plant laccases are implicated in lignin biosynthesis since genetic evidence was derived from the Arabidopsis LAC4 and LAC17. Manipulation of plant laccases has been considered as a promising and innovative strategy in plant biomass engineering for desirable lignin content and/or composition, since lignin is the major recalcitrant component to saccharification in biofuel production from lignocellulose, and therefore directly limits the fermentation yields. Moreover, plant laccases have been reported to be involved in wound healing, maintenance of cell wall structure and integrity, and plant responses to environmental stresses. Here, we summarize the properties and functions of plant laccase, and discuss the potential of biotechnological application, thus providing a new insight into plant laccase, an old enzyme with a promising beginning in lignocellulose biofuel production.
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Affiliation(s)
- Jinhui Wang
- />Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 China
| | - Juanjuan Feng
- />Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 China
| | - Weitao Jia
- />Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 China
| | - Sandra Chang
- />Beijing Engineering Research Center for Biofuels, Tsinghua University, Beijing, 100084 China
- />Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084 China
| | - Shizhong Li
- />Beijing Engineering Research Center for Biofuels, Tsinghua University, Beijing, 100084 China
- />Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084 China
| | - Yinxin Li
- />Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 China
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Brissos V, Ferreira M, Grass G, Martins LO. Turning a Hyperthermostable Metallo-Oxidase into a Laccase by Directed Evolution. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00771] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Vânia Brissos
- Instituto
de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av da República, 2780-157 Oeiras, Portugal
| | - Maura Ferreira
- Instituto
de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av da República, 2780-157 Oeiras, Portugal
| | - Gregor Grass
- Bundeswehr
Institute of Microbiology, DZIF, Partner Site of German Center for Infection Research, Neuherbergstrasse 11, Munich DE 80937, Germany
| | - Lígia O. Martins
- Instituto
de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av da República, 2780-157 Oeiras, Portugal
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68
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Si W, Wu Z, Wang L, Yang M, Zhao X. Enzymological Characterization of Atm, the First Laccase from Agrobacterium sp. S5-1, with the Ability to Enhance In Vitro digestibility of Maize Straw. PLoS One 2015; 10:e0128204. [PMID: 26010258 PMCID: PMC4444218 DOI: 10.1371/journal.pone.0128204] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 04/24/2015] [Indexed: 11/19/2022] Open
Abstract
Laccase is an enzyme that catalyzes oxidation of phenolic compounds, diamines and aromatic amines. In this study, a novel laccase-like gene (atm) in a ligninolyitic isolate Agrobacterium sp. S5-1 from soil humus was identified and heterologously expressed in Escherichia coli. Atm exhibited its maximal activity at pH 4.5 and at 50°C. This enzyme was tolerant to high temperature, a broad range of pH, heavy metal ions (Co3+, Mn2+, Cu2+ and Ni2+, 20 mM) and all tested organic solvents. Furthermore, Atm significantly (p<0.05) increased dry matter digestibility of maize straw from 23.44% to 27.96% and from 29.53% to 37.10% after 8 or 24 h of digestion and improved acid detergent fiber digestibility from 5.81% to 10.33% and from 12.80% to 19.07% after 8 or 24 h of digestion, respectively. The combination of Atm and fibrolytic enzymes significantly (p<0.05) enhanced neutral detergent fiber digestibility from 19.02% to 24.55% after 24 h of digestion respectively. Results showed treatment with Atm effectively improved in vitro digestibility of maize straw, thus suggesting that Atm has an application potential for bioconversion of lignin rich agricultural byproducts into animal feed and cellulosic ethanol.
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Affiliation(s)
- Wei Si
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, People’s Republic of China
| | - ZhaoWei Wu
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, People’s Republic of China
| | - LiangLiang Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, People’s Republic of China
| | - MingMing Yang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, People’s Republic of China
- * E-mail: (MY); (XZ)
| | - Xin Zhao
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, People’s Republic of China
- Department of Animal Science, McGill University, Quebec, Canada
- * E-mail: (MY); (XZ)
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