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Meng Y, Wei Y, Jin M, Zhang Y, Zhang S. Straw degradation enhanced in Thermomyces lanuginosus by transferring AgCMCase from Aspergillus glaucus. BIORESOURCE TECHNOLOGY 2024; 413:131431. [PMID: 39241812 DOI: 10.1016/j.biortech.2024.131431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 09/02/2024] [Accepted: 09/02/2024] [Indexed: 09/09/2024]
Abstract
Fungi play a crucial role in straw composting due to the synergistic degradation effects of their secreted lignocellulose hydrolases. An efficient straw-composting system relies on thermophilic fungi and their lignocellulose hydrolases. Thermomyces lanuginosus, a typical thermophilic fungus in compost, lacks cellulase genes. A versatile Thermomyces strain capable of degrading cellulose, T. lanuginosus M85, which grows at 67 °C, was developed and transformed using the AgCMCase of Aspergillus glaucus. The R6 transformant exhibited high-level expression of the AgCMCase. Significant quantities of active cellulase produced by R6 were detected in the cellulose fermentation broth, peaking within 6-8 days. Compost analysis indicated that R6 increased the internal compost temperatures and prolonged high-temperature durations. Correspondingly, more reducing sugars and humus were released, which could promote plants growth. In summary, a cellulase-producing strain of T. lanuginosus capable of efficiently converting straws into organic fertilizers was engineered. This innovation holds considerable promise for sustainable and circular agricultural practices.
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Affiliation(s)
- Yuan Meng
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Yi Wei
- The Key Laboratory for Extreme-Environmental Microbiology, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China
| | - Meng Jin
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Yanli Zhang
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Shihong Zhang
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China; The Key Laboratory for Extreme-Environmental Microbiology, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China.
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Chettri D, Verma AK. Statistical optimization of cellulase production from Bacillus sp. YE16 isolated from yak dung of the Sikkim Himalayas for its application in bioethanol production using pretreated sugarcane bagasse. Microbiol Res 2024; 281:127623. [PMID: 38301380 DOI: 10.1016/j.micres.2024.127623] [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: 07/06/2023] [Revised: 11/03/2023] [Accepted: 01/13/2024] [Indexed: 02/03/2024]
Abstract
Cellulolytic bacteria were isolated from yak dung samples collected from different habitats of Sikkim, India. Isolate YE16 from the Yumthang Valley sample showed highest enzyme activity of 7.68 U/mL and was identified as Bacillus sp., which has a sequence similarity of 96.15% with B. velezensis. One factor at a time (OFAT) analysis revealed that an acidic pH of 5 with 37 °C temperature was optimum for maximum enzyme production after 36 hrs of incubation (13.88 U/mL), which was further increased after statistical optimization (34.70 U/mL). Media optimization based on response surface methodology predicted that Carboxymethyl cellulose (CMC) and MgSO4 at concentrations of 30 g/L and 0.525 g/L, respectively, at pH 5.5 to show CMCase activity of 30.612 U/mL, which was consistent with the observed value of 30.25 U/mL and confirmed the model. The crude enzyme also efficiently hydrolyzed alkaline pretreated sugarcane bagasse, releasing 7.09 g/L of glucose equivalent with an ethanol production of 3.05 g.
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Affiliation(s)
- Dixita Chettri
- Department of Microbiology, Sikkim University, Gangtok 737102, Sikkim, India
| | - Anil Kumar Verma
- Department of Microbiology, Sikkim University, Gangtok 737102, Sikkim, India.
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Bodnár V, Király A, Orosz E, Miskei M, Emri T, Karányi Z, Leiter É, de Vries RP, Pócsi I. Species-specific effects of the introduction of Aspergillus nidulans gfdB in osmophilic aspergilli. Appl Microbiol Biotechnol 2023; 107:2423-2436. [PMID: 36811707 PMCID: PMC10033484 DOI: 10.1007/s00253-023-12384-9] [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: 10/15/2022] [Revised: 01/09/2023] [Accepted: 01/11/2023] [Indexed: 02/24/2023]
Abstract
Industrial fungi need a strong environmental stress tolerance to ensure acceptable efficiency and yields. Previous studies shed light on the important role that Aspergillus nidulans gfdB, putatively encoding a NAD+-dependent glycerol-3-phosphate dehydrogenase, plays in the oxidative and cell wall integrity stress tolerance of this filamentous fungus model organism. The insertion of A. nidulans gfdB into the genome of Aspergillus glaucus strengthened the environmental stress tolerance of this xerophilic/osmophilic fungus, which may facilitate the involvement of this fungus in various industrial and environmental biotechnological processes. On the other hand, the transfer of A. nidulans gfdB to Aspergillus wentii, another promising industrial xerophilic/osmophilic fungus, resulted only in minor and sporadic improvement in environmental stress tolerance and meanwhile partially reversed osmophily. Because A. glaucus and A. wentii are phylogenetically closely related species and both fungi lack a gfdB ortholog, these results warn us that any disturbance of the stress response system of the aspergilli may elicit rather complex and even unforeseeable, species-specific physiological changes. This should be taken into consideration in any future targeted industrial strain development projects aiming at the fortification of the general stress tolerance of these fungi. KEY POINTS: • A. wentii c' gfdB strains showed minor and sporadic stress tolerance phenotypes. • The osmophily of A. wentii significantly decreased in the c' gfdB strains. • Insertion of gfdB caused species-specific phenotypes in A. wentii and A. glaucus.
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Affiliation(s)
- Veronika Bodnár
- Department of Molecular Biotechnology and Microbiology, Institute of Biotechnology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
- Doctoral School of Nutrition and Food Sciences, University of Debrecen, Debrecen, Hungary
| | - Anita Király
- Department of Molecular Biotechnology and Microbiology, Institute of Biotechnology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Erzsébet Orosz
- Department of Molecular Biotechnology and Microbiology, Institute of Biotechnology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Márton Miskei
- ELRN-UD Fungal Stress Biology Research Group, Debrecen, Hungary
| | - Tamás Emri
- Department of Molecular Biotechnology and Microbiology, Institute of Biotechnology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
- ELRN-UD Fungal Stress Biology Research Group, Debrecen, Hungary
| | - Zsolt Karányi
- Department of Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Éva Leiter
- Department of Molecular Biotechnology and Microbiology, Institute of Biotechnology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
- ELRN-UD Fungal Stress Biology Research Group, Debrecen, Hungary
| | - Ronald P de Vries
- Fungal Physiology, Westerdijk Fungal Biodiversity Institute & Fungal Molecular Physiology, Utrecht University, Utrecht, the Netherlands
| | - István Pócsi
- Department of Molecular Biotechnology and Microbiology, Institute of Biotechnology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary.
- ELRN-UD Fungal Stress Biology Research Group, Debrecen, Hungary.
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Optimization of Wheat Straw Conversion into Microbial Lipids by Lipomyces tetrasporus DSM 70314 from Bench to Pilot Scale. FERMENTATION-BASEL 2023. [DOI: 10.3390/fermentation9020180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Microbial lipids are renewable platforms for several applications including biofuels, green chemicals, and nutraceuticals that can be produced from several residual carbon sources. Lignocellulosic biomasses are abundant raw materials for the production of second-generation sugars with conversion yields depending on the quality of the hydrolysates and the metabolic efficiency of the microorganisms. In the present work, wheat straw pre-treated by steam explosion and enzymatically hydrolysed was converted into microbial lipids by Lipomyces tetrasporus DSM 70314. The preliminary optimization of the enzymatic hydrolysis was performed at the bench scale through the response surface methodology (RSM). The fermentation medium and set-up were optimized in terms of the nitrogen (N) source and carbon-to-nitrogen (C/N) ratio yielding to the selection of soy flour as a N source and C/N ratio of 160. The bench scale settings were scaled-up and further optimized at the 10 L-scale and finally at the 50 L pilot scale bioreactor. Process optimization also included oxygen supply strategies. Under optimized conditions, a lipid concentration of 14.8 gL−1 was achieved corresponding to a 23.1% w/w lipid yield and 67.4% w/w lipid cell content. Oleic acid was the most abundant fatty acid with a percentage of 57%. The overall process mass balance was assessed for the production of biodiesel from wheat straw.
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Hydrothermal and Chemical Pretreatment Process for Bioethanol Production from Agricultural and Forest Lignocellulosic Wastes: Design and Modeling. CHEMISTRY AFRICA 2022. [DOI: 10.1007/s42250-022-00563-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Liu X, Qi Y, Lian J, Song J, Zhang S, Zhang G, Fan J, Zhang N. Construction of actinomycetes complex flora in degrading corn straw and an evaluation of their degradative effects. Biotechnol Lett 2022; 44:1477-1493. [DOI: 10.1007/s10529-022-03313-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 10/04/2022] [Accepted: 10/11/2022] [Indexed: 11/02/2022]
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Zhang G, Dong Y. Design and application of an efficient cellulose-degrading microbial consortium and carboxymethyl cellulase production optimization. Front Microbiol 2022; 13:957444. [PMID: 35910619 PMCID: PMC9335055 DOI: 10.3389/fmicb.2022.957444] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 06/28/2022] [Indexed: 11/30/2022] Open
Abstract
Microbial consortia with high cellulase activities can speed up the composting of agricultural wastes with high cellulose contents and promote the beneficial utilization of agricultural wastes. In this paper, rabbit feces and sesame oil cake were used as feedstocks for compost production. Cellulose-degrading microbial strains were isolated from compost samples taken at the different composting stages and screened via Congo red staining and filter paper degradation test. Seven strains, Trichoderma reesei, Escherichia fergusonii, Proteus vulgaris, Aspergillus glaucus, Bacillus mycoides, Corynebacterium glutamicum, and Serratia marcescens, with high activities of carboxymethyl cellulase (CMCase), filter paper cellulase (FPase), and β-glucosidase (β-Gase) were identified and selected for consortium design. Six microbial consortia were designed with these strains. Compared with the other five consortia, consortium VI composed of all seven strains displayed the highest cellulase activities, 141.89, 104.56, and 131.18 U/ml of CMCase, FPase, and β-Gase, respectively. The single factor approach and response surface method were employed to optimize CMCase production of consortium VI. The optimized conditions were: culture time 4.25 days, culture temperature 35.5°C, pH 6.6, and inoculum volume 5% (v/v). Under these optimized conditions, the CMCase activity of consortium VI was up to 170.83 U/ml. Fermentation experiment of rabbit feces was carried out by using the consortium VI cultured under the optimal conditions. It was found that the application effect was better than other treatments, and the fermentation efficiency and nutrient content of the pile were significantly improved. This study provides a basis for the design of microbial consortia for the composting of agricultural wastes with high cellulose contents and provides a support for beneficial utilization of agricultural wastes.
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Seddouk L, Jamai L, Tazi K, Ettayebi M, Alaoui-Mhamdi M, Aleya L, Janati-Idrissi A. Isolation and characterization of a mesophilic cellulolytic endophyte Preussia africana from Juniperus oxycedrus. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:45589-45600. [PMID: 35146609 DOI: 10.1007/s11356-022-19151-9] [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: 10/18/2021] [Accepted: 02/06/2022] [Indexed: 06/14/2023]
Abstract
The medicinal plant Juniperus oxycedrus is less recognized for the diversity of its fungal endophytes and their potential to produce extracellular enzymes. The present study is the first report on the isolation and identification of a mesophilic endophytic strain JO-A, Preussia africana, from fresh stems of the J. oxycedrus endemic tree in the Ifrane region-Morocco, and the evaluation of its ability to produce cellulases. A one-time multi-parameter one-factor screening was optimized to select factors that enhance cellulase production in P. africana. The maximum production of both CMCase and FPase activities were 1.913 IU.mL-1 and 0.885 IU.mL-1, respectively, when the medium was supplemented with 2% w/v glucose. These remarkable titers were tenfold greater than those obtained under the initial non-optimized conditions. This mesophilic P. africana JO-A strain grows and actively produces cellulases at 37 °C demonstrating its great potential for various biotechnology applications. The cellulolytic extract showed the highest enzymatic activities at pH 5.0 and 50 °C with a half-life of 24 h at 50 °C.
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Affiliation(s)
- Loubna Seddouk
- Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Faculty of Sciences DM, Sidi Mohammed Ben Abdellah University, P.O. Box 1796 Atlas, Fez, Morocco
| | - Latifa Jamai
- Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Faculty of Sciences DM, Sidi Mohammed Ben Abdellah University, P.O. Box 1796 Atlas, Fez, Morocco
| | - Karima Tazi
- Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Faculty of Sciences DM, Sidi Mohammed Ben Abdellah University, P.O. Box 1796 Atlas, Fez, Morocco
| | - Mohamed Ettayebi
- The Institute for Infectious Disease Research, McMaster University, 1280 Main Street West, Hamilton, ON, Canada
| | - Mohammed Alaoui-Mhamdi
- Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Faculty of Sciences DM, Sidi Mohammed Ben Abdellah University, P.O. Box 1796 Atlas, Fez, Morocco.
| | - Lotfi Aleya
- CNRS 6249-Université de Franche-Comté, 16, route de Gray F-25030, Besançon cedex, France
| | - Abellatif Janati-Idrissi
- Laboratory of Biotechnology, Conservation and Valorization of Natural Resources, Faculty of Sciences DM, Sidi Mohammed Ben Abdellah University, P.O. Box 1796 Atlas, Fez, Morocco
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Zheng XH, Ye RF, Ding QH, Hu FX, Zhang HZ, Lai S. Simultaneous improvement of lincomycin A production and reduction of lincomycin B levels in Streptomyces lincolnensis using a combined medium optimization approach. ANN MICROBIOL 2022. [DOI: 10.1186/s13213-022-01672-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Purpose
The current study aimed to optimize the culture and production parameters of industrial production of lincomycin A by Streptomyces lincolnensis using a statistical approach that could also reduce unwanted by-products.
Methods
The Plackett-Burman design, steepest ascent method, and response surface design were used to evaluate different factors that affect lincomycin A production.
Results
Using an optimized S. lincolnensis fermentation medium, lincomycin A production was increased up to 4600 mg/L in shaking flasks, which indicated a 28.3% improvement over previous production in an un-optimized medium (3585 mg/L). Additionally, the concentration of lincomycin B by-product was reduced to 0.8%, which was 82.2% lower than that in the un-optimized medium. Further, quantitative real-time PCR analysis revealed the optimized medium improved lincomycin A production by stimulating key genes in the lincomycin A biosynthesis pathway, as well as an osmotic stress gene.
Conclusions
Based on the results, the sequential optimization strategy in this study provides powerful means for the enhancement of lincomycin A with less by-product. We found that osmotic stress reduced the concentration of lincomycin B, which could also help reduce fermentation by-product yields in other actinobacteria.
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LIU H, CHEN W, LI RT. Research on complex enzyme system to extract Hibiscus Sabdariffa L reducing sugar. FOOD SCIENCE AND TECHNOLOGY 2022. [DOI: 10.1590/fst.38621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Affiliation(s)
- Hua LIU
- Guangzhou College of Technology and Business, China; University Putra Malaysia, Malaysia
| | - Wei CHEN
- Guangzhou College of Technology and Business, China
| | - Rui-Ting LI
- Guangzhou College of Technology and Business, China
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Awoyale AA, Lokhat D. Hybridization of Selected Nigerian Lignocellulosic Biomass Feedstocks for Bioethanol Production: Modeling and Optimization of Pretreatment and Fermentation Process Parameters Using Response Surface Methodology. J Oleo Sci 2021; 70:1013-1026. [PMID: 34121032 DOI: 10.5650/jos.ess21038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In this study, hybridized feedstocks (mixtures of biomass) of cassava peels plus yam peels, as well as corn cobs plus rice husks biomass, were optimized using the response surface methodology centered on the statistical design of experiments (DOE) of the Box-Behnken design (BBD), to produce bioethanol. The feedstocks were locally sourced, hybridized (mixed), pretreated, and fermented before being distilled in a UOP3CC continuous distillation column. The BBD was applied using a 3-level, 3-factor process variables using pH, time, and particle size, and indicated as X1, X2, and X3, respectively. The bioethanol yield from the two hybridized biomass feedstocks was predicted by the developed quadratic polynomial models from BBD. For the hybridized biomass mixture of cassava peels plus yam peels, the optimal condition was statistically predicted as pH 5.00, fermentation time of 120.00 hours, and particle size of 362.5 microns, the predicted bioethanol yield under the optimal condition was 115.75 mL per 1500 g of hybridized biomass and the average volume of bioethanol obtained was 125.00 mL per 1500 g of biomass, which is within the projected range of the model equation, same applies to rice husks plus corn cobs hybridized biomass, but with a better prospect for bioethanol production.
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Affiliation(s)
- Adeolu A Awoyale
- Reactor Technology Research Group, School of Engineering, University of KwaZulu-Natal.,Petroleum and Natural Gas Processing Department, Petroleum Training Institute
| | - David Lokhat
- Reactor Technology Research Group, School of Engineering, University of KwaZulu-Natal
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Increasement of O-acetylhomoserine production in Escherichia coli by modification of glycerol-oxidative pathway coupled with optimization of fermentation. Biotechnol Lett 2020; 43:105-117. [PMID: 33083859 DOI: 10.1007/s10529-020-03031-8] [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: 04/13/2020] [Accepted: 10/13/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE O-acetylhomoserine (OAH) is an important platform chemical to produce high-valuable chemicals. To improve the production of O-acetylhomoserine from glycerol, the glycerol-oxidative pathway was investigated and the optimization of fermentation with crude glycerol was carried out. RESULTS The glycerol-uptake system and glycerol-oxidative pathway were modified and O-acetyltransferase from Corynebacterium glutamicum was introduced into the engineered strain to produce O-acetylhomoserine. It was found that overexpression of glycerol 3-phosphate dehydrogenase improved the OAH production to 6.79 and 4.21 g/L from pure and crude glycerol, respectively. And the higher OAH production depending on higher level of transcription of glpD. Two-step statistical approach was employed to optimize the fermentation conditions. The significant effects of glycerol, ammonium chloride and yeast extract were screened applying Plackett-Burman design and were optimized further by employing the Response Surface Methodology. Under optimized conditions, the OAH production was up to 9.42 and 7.01 g/L when pure and crude glycerol were used in shake flask cultivations, respectively. CONCLUSIONS The enzymatic step catalyzing the oxidation of glycerol through GlpD was the key step for OAH production, which served the foundation for realization of a consistent OAH production from crude glycerol in the future.
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