1
|
Zajki-Zechmeister K, Eibinger M, Nidetzky B. Enzyme Synergy in Transient Clusters of Endo- and Exocellulase Enables a Multilayer Mode of Processive Depolymerization of Cellulose. ACS Catal 2022; 12:10984-10994. [PMID: 36082050 PMCID: PMC9442579 DOI: 10.1021/acscatal.2c02377] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 08/12/2022] [Indexed: 11/29/2022]
Abstract
Biological degradation of cellulosic materials relies on the molecular-mechanistic principle that internally chain-cleaving endocellulases work synergistically with chain end-cleaving exocellulases in polysaccharide chain depolymerization. How endo-exo synergy becomes effective in the deconstruction of a solid substrate that presents cellulose chains assembled into crystalline material is an open question of the mechanism, with immediate implications on the bioconversion efficiency of cellulases. Here, based on single-molecule evidence from real-time atomic force microscopy, we discover that endo- and exocellulases engage in the formation of transient clusters of typically three to four enzymes at the cellulose surface. The clusters form specifically at regular domains of crystalline cellulose microfibrils that feature molecular defects in the polysaccharide chain organization. The dynamics of cluster formation correlates with substrate degradation through a multilayer-processive mode of chain depolymerization, overall leading to the directed ablation of single microfibrils from the cellulose surface. Each multilayer-processive step involves the spatiotemporally coordinated and mechanistically concerted activity of the endo- and exocellulases in close proximity. Mechanistically, the cooperativity with the endocellulase enables the exocellulase to pass through its processive cycles ∼100-fold faster than when acting alone. Our results suggest an advanced paradigm of efficient multienzymatic degradation of structurally organized polymer materials by endo-exo synergetic chain depolymerization.
Collapse
Affiliation(s)
- Krisztina Zajki-Zechmeister
- Institute
of Biotechnology and Biochemical Engineering, Graz University of Technology, Petersgasse 10-12/1, 8010 Graz, Austria
| | - Manuel Eibinger
- Institute
of Biotechnology and Biochemical Engineering, Graz University of Technology, Petersgasse 10-12/1, 8010 Graz, Austria
| | - Bernd Nidetzky
- Institute
of Biotechnology and Biochemical Engineering, Graz University of Technology, Petersgasse 10-12/1, 8010 Graz, Austria
- Austrian
Centre of Industrial Biotechnology, Petersgasse 14, 8010 Graz, Austria
| |
Collapse
|
2
|
The Linker Region Promotes Activity and Binding Efficiency of Modular LPMO towards Polymeric Substrate. Microbiol Spectr 2022; 10:e0269721. [PMID: 35080440 PMCID: PMC8791183 DOI: 10.1128/spectrum.02697-21] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Lytic polysaccharide monooxygenases (LPMOs) mediate oxidative degradation of plant polysaccharides. The genes encoding LPMOs are most commonly arranged with one catalytic domain, while a few are found tethered to additional noncatalytic units, i.e., cellulase linker and carbohydrate-binding module (CBM). The presence of CBM is known to facilitate catalysis by directing the enzymes toward cellulosic polymer, while the role of linkers is poorly understood. Based on limited experimental evidence, linkers are believed to serve merely as flexible spacers between the structured domains. Thus, this study aims to unravel the role of the linker regions present in LPMO sequences. For this, we analyzed the genome of Botrytis cinerea and found 9 genes encoding cellulose lytic monooxygenases (AA9 family), of which BcAA9C was overexpressed in cellulose-inducible conditions. We designed variants of flLPMO (full-length enzyme) with truncation of either linker or CBM to examine the role of linker in activity, binding, and thermal stability of the associated monooxygenase. Biochemical assays predicted that the deletion of linker does not impact the potential of flLPMO for catalyzing the oxidation of Amplex Red, but that it does have a major influence on the capability of flLPMO to degrade recalcitrant polysaccharide substrate. Langmuir isotherm and SEM analysis demonstrated that linker domain aids in polysaccharide binding during flLPMO-mediated deconstruction of plant cell wall. Interestingly, linker domain was also found to contribute toward the thermostability of flLPMO. Overall, our study reveals that linker is not merely a spacer, but plays a key role in LPMO-mediated biomass fibrillation; these findings are broadly applicable to other polysaccharide-degrading enzymes. IMPORTANCE The polysaccharide-disintegrating carbohydrate-active enzymes (CAZymes) are often found with multimodular architecture, where the catalytic domain is connected to an accessory CBM domain with the help of a flexible linker region. So far, the linker has been understood merely as a flexible spacer between the two domains. Therefore, the current study is designed to determine the role of linker in polysaccharide fibrillation. To conceive this study, we have selected LPMO as a model enzyme, as it is not only an industrially relevant enzyme but it also harbors a catalytic domain, linker region, and CBM domain. The present study highlighted the crucial and indispensable role of the linker region in mediating polysaccharide disintegration. Considering its role in binding, thermostability, and activity toward polysaccharide substrate, we propose linker as a potential candidate for future CAZyme engineering.
Collapse
|
3
|
Peng ZQ, Li C, Lin Y, Wu SS, Gan LH, Liu J, Yang SL, Zeng XH, Lin L. Cellulase production and efficient saccharification of biomass by a new mutant Trichoderma afroharzianum MEA-12. BIOTECHNOLOGY FOR BIOFUELS 2021; 14:219. [PMID: 34809676 PMCID: PMC8607671 DOI: 10.1186/s13068-021-02072-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 11/10/2021] [Indexed: 06/01/2023]
Abstract
BACKGROUND Cellulase plays a key role in converting cellulosic biomass into fermentable sugar to produce chemicals and fuels, which is generally produced by filamentous fungi. However, most of the filamentous fungi obtained by natural breeding have low secretory capacity in cellulase production, which are far from meeting the requirements of industrial production. Random mutagenesis combined with adaptive laboratory evolution (ALE) strategy is an effective method to increase the production of fungal enzymes. RESULTS This study obtained a mutant of Trichoderma afroharzianum by exposures to N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), Ethyl Methanesulfonate (EMS), Atmospheric and Room Temperature Plasma (ARTP) and ALE with high sugar stress. The T. afroharzianum mutant MEA-12 produced 0.60, 5.47, 0.31 and 2.17 IU/mL FPase, CMCase, pNPCase and pNPGase, respectively. These levels were 4.33, 6.37, 4.92 and 4.15 times higher than those of the parental strain, respectively. Also, it was found that T. afroharzianum had the same carbon catabolite repression (CCR) effect as other Trichoderma in liquid submerged fermentation. In contrast, the mutant MEA-12 can tolerate the inhibition of glucose (up to 20 mM) without affecting enzyme production under inducing conditions. Interestingly, crude enzyme from MEA-12 showed high enzymatic hydrolysis efficiency against three different biomasses (cornstalk, bamboo and reed), when combined with cellulase from T. reesei Rut-C30. In addition, the factors that improved cellulase production by MEA-12 were clarified. CONCLUSIONS Overall, compound mutagenesis combined with ALE effectively increased the production of fungal cellulase. A super-producing mutant MEA-12 was obtained, and its cellulase could hydrolyze common biomasses efficiently, in combination with enzymes derived from model strain T. reesei, which provides a new choice for processing of bioresources in the future.
Collapse
Affiliation(s)
- Zhi-Qing Peng
- College of Energy, Xiamen University, Xiamen, 361102, China
| | - Chuang Li
- College of Energy, Xiamen University, Xiamen, 361102, China
| | - Yi Lin
- College of Energy, Xiamen University, Xiamen, 361102, China
| | - Sheng-Shan Wu
- College of Energy, Xiamen University, Xiamen, 361102, China
- Fujian Engineering and Research Centre of Clean and High-Valued Technologies for Biomass, Xiamen, 361102, China
- Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Xiamen, 361102, China
| | - Li-Hui Gan
- College of Energy, Xiamen University, Xiamen, 361102, China
- Fujian Engineering and Research Centre of Clean and High-Valued Technologies for Biomass, Xiamen, 361102, China
- Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Xiamen, 361102, China
| | - Jian Liu
- College of Energy, Xiamen University, Xiamen, 361102, China
- Fujian Engineering and Research Centre of Clean and High-Valued Technologies for Biomass, Xiamen, 361102, China
- Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Xiamen, 361102, China
| | - Shu-Liang Yang
- College of Energy, Xiamen University, Xiamen, 361102, China
- Fujian Engineering and Research Centre of Clean and High-Valued Technologies for Biomass, Xiamen, 361102, China
- Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Xiamen, 361102, China
| | - Xian-Hai Zeng
- College of Energy, Xiamen University, Xiamen, 361102, China.
- Fujian Engineering and Research Centre of Clean and High-Valued Technologies for Biomass, Xiamen, 361102, China.
- Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Xiamen, 361102, China.
| | - Lu Lin
- College of Energy, Xiamen University, Xiamen, 361102, China
- Fujian Engineering and Research Centre of Clean and High-Valued Technologies for Biomass, Xiamen, 361102, China
- Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Xiamen, 361102, China
| |
Collapse
|
4
|
Pimentel PSSR, de Oliveira JB, Astolfi-Filho S, Pereira N. Enzymatic Hydrolysis of Lignocellulosic Biomass Using an Optimized Enzymatic Cocktail Prepared from Secretomes of Filamentous Fungi Isolated from Amazonian Biodiversity. Appl Biochem Biotechnol 2021; 193:3915-3935. [PMID: 34410613 DOI: 10.1007/s12010-021-03642-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 08/10/2021] [Indexed: 11/24/2022]
Abstract
The use of lignocellulosic biomass (LCB) has emerged as one of the main strategies for generating renewable biofuels. For the efficient use of such feedstock, pre-treatments are essential. The hydrolysis of cellulose - major component of LCB - demands enzymatic cocktails with improved efficiency to generate fermentable sugars. In this scenario, lignocellulolytic fungi have enormous potential for the development of efficient enzyme platforms. In this study, two enzymatic cocktails were developed for hydrolysis of two lignocellulosic biomasses: industrial cellulose pulp and cassava peel. The solid biomass ratio in relation to the protein content of the enzyme cocktail was performed by experimental design. The optimized cocktail for the hydrolysis of cellulose pulp (AMZ 1) was composed, in protein base, by 43% of Aspergillus sp. LMI03 enzyme extract and 57% of T. reesei QM9414, while the optimal enzyme cocktail for cassava peel hydrolysis (AMZ 2) was composed by 50% of Aspergillus sp. LMI03 enzyme extract, 25% of the extract of P. citrinum LMI01 and 25% of T. reesei. The ratio between solids and protein loading for AMZ 1 cocktail performance was 52 g/L solids and 30 mg protein/g solids, resulting in a hydrolytic efficiency of 93%. For the AMZ 2 cocktail, the hydrolytic efficiency was 78% for an optimized ratio of 78 g/L solids and 19 mg protein/g solids. These results indicate that cocktails formulated with enzymatic extracts of P. citrinum LMI01, Aspergillus sp. LMI03, and T. reesei QM9414 are excellent alternatives for efficient hydrolysis of plant biomass and for other processes that depend on biocatalysis.
Collapse
Affiliation(s)
| | - Jessica Batista de Oliveira
- Multi Institutional Biotechnology Graduate Program, Federal University of Amazonas, Manaus, 69067-005, Brazil
| | - Spartaco Astolfi-Filho
- Centro de Apoio Multidisciplinar (CAM), Federal University of Amazonas, Manaus, 69067-005, Brazil
| | - Nei Pereira
- Laboratory of Bioprocess Development, Center of Biofuels, Oil and Derivatives, School of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-594, Brazil
| |
Collapse
|
5
|
Massarente VS, de Araujo Zanoni J, Gomes E, Bonilla-Rodriguez GO. Biochemical characterization of endoglucanases produced by Myceliophthora thermophila M.7.7 in solid-state culture. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101684] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
6
|
Xue Y, Han J, Li Y, Liu J, Gan L, Long M. Promoting cellulase and hemicellulase production from Trichoderma orientalis EU7-22 by overexpression of transcription factors Xyr1 and Ace3. BIORESOURCE TECHNOLOGY 2020; 296:122355. [PMID: 31711906 DOI: 10.1016/j.biortech.2019.122355] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 10/29/2019] [Accepted: 10/30/2019] [Indexed: 05/07/2023]
Abstract
The construction of hyper-production strains of cellulase is the prerequisite for the production of biofuels or biochemicals. Trichoderma orientalis EU7-22 with complete cellulase system shows the potential for cellulase production in industrial scale. To improve the cellulase production, two crucial transcription activators Xyr1 and Ace3 were constitutively overexpressed in EU7-22 strain. Cellulase, xylanase and protein secretion were significantly improved in the recombinant strain dxyA-8 under inducing culture, which were 2.34, 0.68 and 1.06 folds higher than those of EU7-22, respectively. Moreover, the FPase and CMCase activities were up to 2.55 IU/mL and 90.38 IU/mL with glucose as carbon source, which were 2.12 and 1.95 folds higher than those of EU7-22 under inducing condition, respectively. Reducing sugar released from pretreated spartina that hydrolyzed by crude enzyme from dxyA-8 had achieved 24% improvement. Therefore, overexpression of these transcription factors effectively promotes the production of cellulase and hemicellulase of Trichoderma orientalis EU7-22.
Collapse
Affiliation(s)
- Yong Xue
- College of Energy, Xiamen University, Xiamen 361005, PR China
| | - Jiang Han
- College of Energy, Xiamen University, Xiamen 361005, PR China
| | - Yuyu Li
- College of Energy, Xiamen University, Xiamen 361005, PR China
| | - Jian Liu
- College of Energy, Xiamen University, Xiamen 361005, PR China; Xiamen Key Laboratory of High-valued Conversion Technology of Agricultural Biomass, Xiamen University, Xiamen, PR China.
| | - Lihui Gan
- College of Energy, Xiamen University, Xiamen 361005, PR China; Xiamen Key Laboratory of High-valued Conversion Technology of Agricultural Biomass, Xiamen University, Xiamen, PR China.
| | - Minnan Long
- College of Energy, Xiamen University, Xiamen 361005, PR China; Fujian Vocational College of Bioengineering, Fuzhou, PR China.
| |
Collapse
|
7
|
Moringa straw as cellulase production inducer and cellulolytic fungi source. Rev Argent Microbiol 2019; 52:4-12. [PMID: 31204058 DOI: 10.1016/j.ram.2019.02.005] [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: 06/05/2018] [Revised: 12/24/2018] [Accepted: 02/22/2019] [Indexed: 11/20/2022] Open
Abstract
Currently, the valorization of agroindustrial waste is of great interest. Moringa oleifera is a multipurpose tree whose softwood residues could be used as raw material for low-cost cellulase production. The aim of this study was to isolate, identify, and characterize microorganisms with cellulolytic activity in different carbon sources. We isolated and purified 42 microorganisms from M. oleifera biomass. Fungi presenting the largest hydrolytic halos in carboxymethylcellulose as a substrate were molecularly identified as Penicillium funiculosum (FG1), Fusarium verticillioides (FG3) and Cladosporium cladosporioides (FC2). The ability of these fungal strains to break down cellulose was assessed in a submerged fermentation using either amorphous CMC or crystalline form (Avicel). P. funiculosum and C. cladosporioides displayed similar endoglucanase (606U/l) and exoglucanase (205U/l) activities in the Avicel-containing medium, whereas F. verticillioides showed the highest level of β-glucosidase activity (664U/l) in the carboxymethylcellulose medium. In addition, the effect of three culture media (A, B, and C) on cellulase production was evaluated in P. funiculosum using moringa straw as a carbon source. The results showed a volumetric productivity improvement of cellulases that was 2.77-, 8.26-, and 2.30-fold higher for endoglucanase, exoglucanase and β-glucosidase, respectively when medium C containing moringa straw was used as a carbon source. The enzymatic extracts produced by these fungi have biotechnological potential especially for second-generation bioethanol production (2G) from moringa straw. This is the first report on the use of M. oleifera biomass to induce the production of various cellulases in P. funiculosum.
Collapse
|
8
|
Kumari U, Singh R, Ray T, Rana S, Saha P, Malhotra K, Daniell H. Validation of leaf enzymes in the detergent and textile industries: launching of a new platform technology. PLANT BIOTECHNOLOGY JOURNAL 2019; 17:1167-1182. [PMID: 30963679 PMCID: PMC6523609 DOI: 10.1111/pbi.13122] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 03/21/2019] [Accepted: 03/27/2019] [Indexed: 05/02/2023]
Abstract
Chemical catalysts are being replaced by biocatalysts in almost all industrial applications due to environmental concerns, thereby increasing their demand. Enzymes used in current industries are produced in microbial systems or plant seeds. We report here five newly launched leaf-enzyme products and their validation with 15 commercial microbial-enzyme products, for detergent or textile industries. Enzymes expressed in chloroplasts are functional at broad pH/temperature ranges as crude-leaf extracts, while most purified commercial enzymes showed significant loss at alkaline pH or higher temperature, required for broad range commercial applications. In contrast to commercial liquid enzymes requiring cold storage/transportation, chloroplast enzymes as a leaf powder can be stored up to 16 months at ambient temperature without loss of enzyme activity. Chloroplast-derived enzymes are stable in crude-leaf extracts without addition of protease inhibitors. Leaf lipase/mannanase crude extracts removed chocolate or mustard oil stains effectively at both low and high temperatures. Moreover, leaf lipase or mannanase crude-extracts removed stain more efficiently at 70 °C than commercial microbial enzymes (<10% activity). Endoglucanase and exoglucanase in crude leaf extracts removed dye efficiently from denim surface and depilled knitted fabric by removal of horizontal fibre strands. Due to an increased demand for enzymes in the food industry, marker-free lettuce plants expressing lipase or cellobiohydrolase were created for the first time and site-specific transgene integration/homoplasmy was confirmed by Southern blots. Thus, leaf-production platform offers a novel low-cost approach by the elimination of fermentation, purification, concentration, formulation and cold-chain storage/transportation. This is the first report of commercially launched protein products made in leaves and validated with current commercial products.
Collapse
Affiliation(s)
- Uma Kumari
- Department of BiochemistrySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Rahul Singh
- Department of BiochemistrySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Tui Ray
- Department of BiochemistrySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Seema Rana
- Department of BiochemistrySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Prasenjit Saha
- Department of BiochemistrySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Karan Malhotra
- Department of BiochemistrySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Henry Daniell
- Department of BiochemistrySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| |
Collapse
|
9
|
Conway JM, Crosby JR, McKinley BS, Seals NL, Adams MWW, Kelly RM. Parsing in vivo and in vitro contributions to microcrystalline cellulose hydrolysis by multidomain glycoside hydrolases in theCaldicellulosiruptor besciisecretome. Biotechnol Bioeng 2018; 115:2426-2440. [DOI: 10.1002/bit.26773] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Revised: 05/21/2018] [Accepted: 06/21/2018] [Indexed: 01/08/2023]
Affiliation(s)
- Jonathan M. Conway
- Department of Chemical and Biomolecular EngineeringNorth Carolina State UniversityRaleigh NC
| | - James R. Crosby
- Department of Chemical and Biomolecular EngineeringNorth Carolina State UniversityRaleigh NC
| | - Bennett S. McKinley
- Department of Chemical and Biomolecular EngineeringNorth Carolina State UniversityRaleigh NC
| | - Nathaniel L. Seals
- Department of Chemical and Biomolecular EngineeringNorth Carolina State UniversityRaleigh NC
| | - Michael W. W. Adams
- Department of Biochemistry and Molecular BiologyUniversity of GeorgiaAthens GA
| | - Robert M. Kelly
- Department of Chemical and Biomolecular EngineeringNorth Carolina State UniversityRaleigh NC
| |
Collapse
|
10
|
Lopes A, Ferreira Filho E, Moreira L. An update on enzymatic cocktails for lignocellulose breakdown. J Appl Microbiol 2018; 125:632-645. [DOI: 10.1111/jam.13923] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 03/20/2018] [Accepted: 05/14/2018] [Indexed: 12/01/2022]
Affiliation(s)
- A.M. Lopes
- Laboratory of Enzymology; Department of Cellular Biology; University of Brasília; Brasilia DF Brazil
| | - E.X. Ferreira Filho
- Laboratory of Enzymology; Department of Cellular Biology; University of Brasília; Brasilia DF Brazil
| | - L.R.S. Moreira
- Laboratory of Enzymology; Department of Cellular Biology; University of Brasília; Brasilia DF Brazil
| |
Collapse
|
11
|
Rocha-Martín J, Martínez-Bernal C, Zamorano LS, Reyes-Sosa FM, Díez García B. Inhibition of enzymatic hydrolysis of pretreated corn stover and sugar cane straw by laccases. Process Biochem 2018. [DOI: 10.1016/j.procbio.2018.01.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
12
|
Zhang F, Zhao X, Bai F. Improvement of cellulase production in Trichoderma reesei Rut-C30 by overexpression of a novel regulatory gene Trvib-1. BIORESOURCE TECHNOLOGY 2018; 247:676-683. [PMID: 30060399 DOI: 10.1016/j.biortech.2017.09.126] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 09/17/2017] [Accepted: 09/18/2017] [Indexed: 05/05/2023]
Abstract
Trichoderma reesei is a widely used cellulase producer, and development of robust strains for improved cellulase production is of great interest. In this study, the gene Trvib-1 encoding a putative transcription factor was overexpressed in T. reesei Rut-C30, and effects on cellulase production by the manipulation as well as corn stover degradation by the crude enzyme were investigated. Cellulase production and protein secretion were significantly improved in the culture of the recombinant T. reesei Vib-1, which were 200% and 219%, respectively, higher than that produced by the parent strain. Cellulase induction was enhanced in the presence of pure cellulose as well as various soluble inducers. Glucose released from the pretreated corn stover hydrolyzed by the crude enzyme in the recombinant strain was improved 40%. These results indicate that the overexpression of Trvib-1 is a feasible strategy for producing cellulase to enhance bioconversion efficiency of lignocellulosic biomass.
Collapse
Affiliation(s)
- Fei Zhang
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xinqing Zhao
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Fengwu Bai
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| |
Collapse
|
13
|
Martín Pérez L, Benítez Casanova L, Moreno Pérez AJ, Pérez Gómez D, Gavaldá Martín S, Ledesma-García L, Valbuena Crespo N, Díez García B, Reyes-Sosa FM. Coupling the pretreatment and hydrolysis of lignocellulosic biomass by the expression of beta-xylosidases. Biotechnol Bioeng 2017; 114:2497-2506. [DOI: 10.1002/bit.26386] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Accepted: 07/10/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Lucía Martín Pérez
- Department of Biotechnology; Abengoa Research; Campus Palmas Altas; Seville Spain
| | | | | | - Dolores Pérez Gómez
- Department of Biotechnology; Abengoa Research; Campus Palmas Altas; Seville Spain
| | | | - Laura Ledesma-García
- Department of Biotechnology; Abengoa Research; Campus Palmas Altas; Seville Spain
| | | | - Bruno Díez García
- Department of Biotechnology; Abengoa Research; Campus Palmas Altas; Seville Spain
| | | |
Collapse
|