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Ma L, Wang M, Gao Y, Wu Y, Zhu C, An S, Tang S, She Q, Gao J, Meng X. Functional study of a lytic polysaccharide monooxygenase MsLPMO3 from Morchella sextelata in the oxidative degradation of cellulose. Enzyme Microb Technol 2024; 173:110376. [PMID: 38096655 DOI: 10.1016/j.enzmictec.2023.110376] [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: 07/15/2023] [Revised: 11/09/2023] [Accepted: 12/07/2023] [Indexed: 12/23/2023]
Abstract
Lytic polysaccharide monooxygenases (LPMOs) can improve the effectiveness with which agricultural waste is utilized. This study described the potent AA9 family protein MsLPMO3, derived from Morchella sextelata. It exhibited strong binding to phosphoric acid swollen cellulose (PASC), and had the considerable binding ability to Cu2+ with a Kd value of 2.70 μM by isothermal titration calorimetry (ITC). MsLPMO3 could also act on PASC at the C1 carbon via MALDI-TOF-MS results. Moreover, MsLPMO3 could boost the hydrolysis efficiency of corncob and wheat bran in combination with glycoside hydrolases. MsLPMO3 also exhibited strong oxidizing ability for 2,6-dimethoxyphenol (2,6-DMP), achieving the best Vmax value of 443.36 U·g-1 for pH 7.4 with a H2O2 concentration of 300 µM. The structure of MsLPMO3 was obtained using AlphaFold2, and the molecular docking results elucidated the specific interactions and key residues involved in the recognition process between MsLPMO3 and cellulose. Altogether, this study expands the knowledge of AA9 family proteins in cellulose degradation, providing valuable insights into the mechanisms of synergistic degradation of lignocellulose with cellulases.
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Affiliation(s)
- Lei Ma
- College of Life Sciences and Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, People's Republic of China
| | - Mengmeng Wang
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, People's Republic of China
| | - Ya Gao
- College of Life Sciences and Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, People's Republic of China
| | - Yinghong Wu
- College of Life Sciences and Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, People's Republic of China
| | - Chaoqiang Zhu
- College of Life Sciences and Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, People's Republic of China
| | - Shuyu An
- College of Life Sciences and Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, People's Republic of China
| | - Siyu Tang
- Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, People's Republic of China
| | - Qiusheng She
- College of Life Sciences and Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, People's Republic of China
| | - Jianmin Gao
- College of Life Sciences and Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, People's Republic of China
| | - Xiaohui Meng
- Department of Agronomy and Horticulture, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, People's Republic of China.
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Li N, Xia H, Jiang Y, Xiong J, Lou W. Co-immobilization of β-xylosidase and endoxylanase on zirconium based metal-organic frameworks for improving xylosidase activity at high temperature and in acetone. BIORESOURCE TECHNOLOGY 2023:129240. [PMID: 37247794 DOI: 10.1016/j.biortech.2023.129240] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 05/31/2023]
Abstract
Improving the activity of β-xylosidase at high temperature and organic solvents is important for the conversion of xylan, phytochemicals and some hydroxyl-containing substances to produce xylose and bioactive substances. In this study, a β-xylosidase R333H and an endoxylanase were simultaneously co-immobilized on the metal-organic framework UiO-66-NH2. Compared with the single R333H immobilization system, the co-immobilization enhanced the activity of R333H at high temperature and high concentration of acetone, and the relative activities at 95°C and 50% acetone solution were > 95%. The Km value of co-immobilized R333H towards p-Nitrophenyl-β-D-xylopyranoside (pNPX) shifted from 2.04 to 0.94 mM, which indicated the enhanced affinity towards pNPX. After 5 cycles, the relative activities of the co-immobilized enzymes towards pNPX and corncob xylan were 52% and 70% respectively, and the accumulated amount of reducing sugars obtained by co-immobilized enzymes degrading corncob xylan in 30% (v/v) acetone solution was 1.7 times than that with no acetone.
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Affiliation(s)
- Na Li
- Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Huan Xia
- Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Yanbin Jiang
- Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China; School of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China.
| | - Jun Xiong
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Wenyong Lou
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
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Zeng S, Ma Q, Zhang S, Shen C, Li J, Zhao H, Guo D, Zhang Y, Yang H. Evaluation of oxy-organosolv pretreatment on lignin extraction from wheat straw. Int J Biol Macromol 2023; 229:861-872. [PMID: 36587642 DOI: 10.1016/j.ijbiomac.2022.12.301] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 12/21/2022] [Accepted: 12/26/2022] [Indexed: 12/30/2022]
Abstract
To develop a characteristic "Lignin-first" strategy, the oxy-organosolv delignification processes under mild conditions were comprehensively investigated. Results showed that lignin yield could achieve about 50 % under the optimum process conditions of ethanol concentration 80 %, temperature 90 °C, liquid to wheat straw ratio 25:1 for powdery-scale substrates, which was 65.0 % higher than that for rod-scale substrates under the same conditions. The lignin structural and carbohydrate component results demonstrated the employment of oxygen induced great quantities of lignin dissolving out on the premise of little carbohydrate component (<1 %) and lignin structural (mainly β-O-4 units) changes. Moreover, based on the molecular weight and polydiversity comparison results, the aqueous oxygen could transfer homogeneously in mild organosolv system and result in lignin degradation uniformly. Besides, the employment of oxygen assisted in not only extending the massive lignin removal stage to 30 min and 50 min for P-OEEL and R-OEEL respectively, but also boost the delignification rate with comparison to P-EL and R-EL. Lastly, the excellent anti-oxidant properties of lignin from oxy-organosolv process were demonstrated by scavenging DPPH and ABTS radicals. The economic calculations showed that the cost for lignin production were about 1.58USD/g lignin from powdery-scale wheat straw, providing a competitive route for high-value utilize waste biomass.
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Affiliation(s)
- Shiyi Zeng
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China
| | - Qingzhi Ma
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China
| | - Shenchong Zhang
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China
| | - Conghao Shen
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China
| | - Jing Li
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China.
| | - Huifang Zhao
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China
| | - Daliang Guo
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China
| | - Yan Zhang
- School of Environmental and Nature Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang Province, China
| | - Hui Yang
- Pinghu Longchen Greentech Co., Ltd, Jiaxing, Zhejiang Province, China
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Kalogiannis KG, Karnaouri A, Michailof C, Tzika AM, Asimakopoulou G, Topakas E, Lappas AA. OxiOrganosolv: A novel acid free oxidative organosolv fractionation for lignocellulose fine sugar streams. BIORESOURCE TECHNOLOGY 2020; 313:123599. [PMID: 32540692 DOI: 10.1016/j.biortech.2020.123599] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/25/2020] [Accepted: 05/27/2020] [Indexed: 05/12/2023]
Abstract
The valorization of lignocellulosic biomass towards the production of value-added products requires an efficient pretreatment/fractionation step. In this work we present a novel, acid-free, mildly oxidative organosolv delignification process -OxiOrganosolv- which employs oxygen gas to depolymerize and remove lignin. The results demonstrate that the OxiOrganosolv process achieved lignin removal as high as 97% in a single stage, with a variety of solvents; it was also efficient in delignifying both beechwood (hardwood) and pine (softwood), a task in which organosolv pretreatments have failed in the past. Minimal amounts of sugar degradation products were detected, while cellulose recovery was ~100% in the solid pulp. Enzymatic hydrolysis of pulps showed >80 wt% cellulose conversion to glucose. Overall, the OxiOrganosolv pretreatment has significant advantages, including high delignification efficiency of hardwood and softwood biomass, absence of acid homogeneous catalysis and all corresponding challenges involved, and close to zero losses of sugars to degradation products.
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Affiliation(s)
- Konstantinos G Kalogiannis
- Chemical Process and Energy Resources Institute (CPERI), CERTH, 6th Km Harilaou-Thermi Road, 57001 Thermi, Thessaloniki, Greece.
| | - Anthi Karnaouri
- Chemical Process and Energy Resources Institute (CPERI), CERTH, 6th Km Harilaou-Thermi Road, 57001 Thermi, Thessaloniki, Greece; Industrial Biotechnology & Biocatalysis Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str., Zografou Campus, Athens 15780, Greece
| | - Chrysoula Michailof
- Chemical Process and Energy Resources Institute (CPERI), CERTH, 6th Km Harilaou-Thermi Road, 57001 Thermi, Thessaloniki, Greece
| | - Anna Maria Tzika
- Chemical Process and Energy Resources Institute (CPERI), CERTH, 6th Km Harilaou-Thermi Road, 57001 Thermi, Thessaloniki, Greece
| | - Georgia Asimakopoulou
- Industrial Biotechnology & Biocatalysis Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str., Zografou Campus, Athens 15780, Greece
| | - Evangelos Topakas
- Industrial Biotechnology & Biocatalysis Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str., Zografou Campus, Athens 15780, Greece; Biochemical and Chemical Process Engineering, Division of Sustainable Process Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Angelos A Lappas
- Chemical Process and Energy Resources Institute (CPERI), CERTH, 6th Km Harilaou-Thermi Road, 57001 Thermi, Thessaloniki, Greece
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Novel Routes in Transformation of Lignocellulosic Biomass to Furan Platform Chemicals: From Pretreatment to Enzyme Catalysis. Catalysts 2020. [DOI: 10.3390/catal10070743] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The constant depletion of fossil fuels along with the increasing need for novel materials, necessitate the development of alternative routes for polymer synthesis. Lignocellulosic biomass, the most abundant carbon source on the planet, can serve as a renewable starting material for the design of environmentally-friendly processes for the synthesis of polyesters, polyamides and other polymers with significant value. The present review provides an overview of the main processes that have been reported throughout the literature for the production of bio-based monomers from lignocellulose, focusing on physicochemical procedures and biocatalysis. An extensive description of all different stages for the production of furans is presented, starting from physicochemical pretreatment of biomass and biocatalytic decomposition to monomeric sugars, coupled with isomerization by enzymes prior to chemical dehydration by acid Lewis catalysts. A summary of all biotransformations of furans carried out by enzymes is also described, focusing on galactose, glyoxal and aryl-alcohol oxidases, monooxygenases and transaminases for the production of oxidized derivatives and amines. The increased interest in these products in polymer chemistry can lead to a redirection of biomass valorization from second generation biofuels to chemical synthesis, by creating novel pathways to produce bio-based polymers.
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Karnaouri A, Chalima A, Kalogiannis KG, Varamogianni-Mamatsi D, Lappas A, Topakas E. Utilization of lignocellulosic biomass towards the production of omega-3 fatty acids by the heterotrophic marine microalga Crypthecodinium cohnii. BIORESOURCE TECHNOLOGY 2020; 303:122899. [PMID: 32028216 DOI: 10.1016/j.biortech.2020.122899] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/23/2020] [Accepted: 01/24/2020] [Indexed: 06/10/2023]
Abstract
Omega-3 fatty acids have become a commodity of high nutritional and commercial value; intensive fishing and its environmental and social cost has led researchers to seeking alternative more sustainable ways of producing them. Heterotrophic microalgae such as Crypthecodinium cohnii, a marine dinoflagellate, have the ability to utilize various substrates and accumulate high amounts of docosahexaenoic acid (DHA). In this work, a mild oxidative organosolv pretreatment of beechwood pulps was employed that allowed up to 95% of lignin removal in a single stage, thus yielding a cellulose-rich solid fraction. The enzymatic hydrolysates were evaluated for their ability to support the growth and lipid accumulation of C. cohnii in batch and fed-batch cultures; the results verified the successful microalgae growth, while DHA reached up to 43.5% of the cell's total lipids. The proposed bioprocess demonstrated the utilization of non-edible biomass towards high added value food supplements in a sustainable and efficient manner.
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Affiliation(s)
- Anthi Karnaouri
- Industrial Biotechnology & Biocatalysis Group, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece
| | - Angelina Chalima
- Industrial Biotechnology & Biocatalysis Group, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece
| | - Konstantinos G Kalogiannis
- Chemical Process and Energy Resources Institute (CPERI), CERTH, 6th Km Harilaou‑Thermi Road, Thermi, 57001, Thessaloniki, Greece
| | - Despoina Varamogianni-Mamatsi
- Industrial Biotechnology & Biocatalysis Group, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece
| | - Angelos Lappas
- Chemical Process and Energy Resources Institute (CPERI), CERTH, 6th Km Harilaou‑Thermi Road, Thermi, 57001, Thessaloniki, Greece
| | - Evangelos Topakas
- Industrial Biotechnology & Biocatalysis Group, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece; Biochemical and Chemical Process Engineering, Division of Sustainable Process Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden.
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7
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Li R, Wang J, Zhao J. Solid-state fermentation of ammoniated corn straw to produce feed protein and toxicological assessment of the product. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:13895-13901. [PMID: 32036536 DOI: 10.1007/s11356-020-07981-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 02/03/2020] [Indexed: 06/10/2023]
Abstract
Solid-state fermentation (SSF) of ammoniated corn straw was used to produce feed protein, followed by a toxicological assessment of the fermentation product. Results showed that through ammonification at 35 °C for 9 days and the subsequent SSF by the two fungi Penicillium sp. and Torula allii at 30 °C for 5 days, the contents of real protein and crude protein of the corn straw reached 29.66% and 35.41%, respectively. Toxicological assessment in mice showed that there were no significant differences (P > 0.05) for micronucleated polychromatic erythrocytes (Mn-PCEs) and sperm abnormality between dose groups and the control group. Malondialdehyde (MDA) levels and activities of superoxide dismutase (T-SOD), glutathione peroxidase (GSH-Px), and catalase (CAT) also showed no significant difference (P > 0.05) between tissues (heart, liver, spleen, stomach, kidney, and brain), which indicates that the fermentation product did not induce toxic effects and is safe to use as ruminant feed.
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Affiliation(s)
- Riqiang Li
- College of Environmental & Resources Sciences, Shanxi University, Taiyuan, 030006, Shanxi Province, China.
| | - Jianxing Wang
- College of Environmental & Resources Sciences, Shanxi University, Taiyuan, 030006, Shanxi Province, China
| | - Jixin Zhao
- College of Environmental & Resources Sciences, Shanxi University, Taiyuan, 030006, Shanxi Province, China
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Ferreira JA, Taherzadeh MJ. Improving the economy of lignocellulose-based biorefineries with organosolv pretreatment. BIORESOURCE TECHNOLOGY 2020; 299:122695. [PMID: 31918973 DOI: 10.1016/j.biortech.2019.122695] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/23/2019] [Accepted: 12/24/2019] [Indexed: 06/10/2023]
Abstract
Lignocellulose-based processes for production of value-added products still face bottlenecks to attain feasibility. The key might lie on the biorefining of all lignocellulose main polymers, that is, cellulose, hemicellulose and lignin. Lignin, considered an impediment in the access of cellulose and normally considered for energy recovery purposes, can give a higher contribution towards profitability of lignocellulosic biorefineries. Organosolv pretreatment allows selective fractionation of lignocellulose into separate cellulose-, hemicellulose- and lignin-rich streams. Ethanol organosolv and wood substrates dominated the research studies, while a wide range of substrates need definition on the most suitable organosolv pretreatment systems. Techno-economic and environmental analyses of organosolv-based processes as well as proper valorization strategies of the hemicellulose-rich fraction are still scarce. In view of dominance of ethanol organosolv with high delignification yields and high-purity of the recovered cellulose-rich fractions, close R & D collaboration with 1st generation ethanol plants might boost commercialization.
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Affiliation(s)
- Jorge A Ferreira
- Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden.
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