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Chen Y, Wang J, Wang M, Han A, Zhao X, Wang W, Wei D. Engineering the metabolism and morphology of the filamentous fungus Trichoderma reesei for efficient L-malic acid production. BIORESOURCE TECHNOLOGY 2023; 387:129629. [PMID: 37558099 DOI: 10.1016/j.biortech.2023.129629] [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: 07/06/2023] [Revised: 07/27/2023] [Accepted: 08/03/2023] [Indexed: 08/11/2023]
Abstract
L-malic acid (MA) is a vital platform chemical with huge market demand because of its broad industrial applications. A cell factory for MA production was engineered by strengthening the intrinsic pathway without inserting foreign genes into Trichoderma reesei. The native MA transporter gene in the T. reesei genome was characterized (trmae1), and its overexpression significantly improved MA production, which increased from 2 to 56.24 g/L. Native pyruvate carboxylase, malate dehydrogenase, malic enzyme, and glucose transporter were overexpressed further to improve the titer and yield of MA production. Fungal morphology was adapted to produce MA in the fermenter by deleting gul1. A titer of 235.8 g/L MA was produced from the final engineered strain in a 5-L fermenter with a yield of 1.48 mol of MA per mol of glucose and productivity of 1.23 g/L/h. This study provides novel insights for understanding and remodeling the MA synthesis pathway.
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Affiliation(s)
- Yumeng Chen
- State Key Lab of Bioreactor Engineering, 130 Meilong Road, Shanghai, China; Luhua Suo, East China University of Science and Technology, Shanghai 200237, China
| | - Jiajia Wang
- State Key Lab of Bioreactor Engineering, 130 Meilong Road, Shanghai, China; Luhua Suo, East China University of Science and Technology, Shanghai 200237, China
| | - Meng Wang
- State Key Lab of Bioreactor Engineering, 130 Meilong Road, Shanghai, China
| | - Ao Han
- State Key Lab of Bioreactor Engineering, 130 Meilong Road, Shanghai, China
| | | | - Wei Wang
- State Key Lab of Bioreactor Engineering, 130 Meilong Road, Shanghai, China; Luhua Suo, East China University of Science and Technology, Shanghai 200237, China.
| | - Dongzhi Wei
- State Key Lab of Bioreactor Engineering, 130 Meilong Road, Shanghai, China; Luhua Suo, East China University of Science and Technology, Shanghai 200237, China
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Schrader M, Schrinner K, Polomsky L, Ivanov D, Kampen I, Schilde C, Krull R, Kwade A. Quantification and modeling of macroparticle-induced mechanical stress for varying shake flask cultivation conditions. Front Bioeng Biotechnol 2023; 11:1254136. [PMID: 37731767 PMCID: PMC10507416 DOI: 10.3389/fbioe.2023.1254136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 08/08/2023] [Indexed: 09/22/2023] Open
Abstract
In biotechnological processes, filamentous microorganisms are known for their broad product spectrum and complex cellular morphology. Product formation and cellular morphology are often closely linked, requiring a well-defined level of mechanical stress to achieve high product concentrations. Macroparticles were added to shake flask cultures of the filamentous actinomycete Lentzea aerocolonigenes to find these optimal cultivation conditions. However, there is currently no model concept for the dependence of the strength and frequency of the bead-induced stress on the process parameters. Therefore, shake flask simulations were performed for combinations of bead size, bead concentration, bead density and shaking frequency. Contact analysis showed that the highest shear stresses were caused by bead-bottom contacts. Based on this, a newly generated characteristic parameter, the stress area ratio (SAR), was defined, which relates the bead wall shear and normal stresses to the total shear area. Comparison of the SAR with previous cultivation results revealed an optimum pattern for product concentration and mean product-to-biomass related yield coefficient. Thus, this model is a suitable tool for future optimization, comparison and scaling up of shear-sensitive microorganism cultivation. Finally, the simulation results were validated using high-speed recordings of the bead motion on the bottom of the shake flask.
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Affiliation(s)
- Marcel Schrader
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
| | - Kathrin Schrinner
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
| | - Laura Polomsky
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
| | - Dimitri Ivanov
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
| | - Ingo Kampen
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
| | - Carsten Schilde
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
| | - Rainer Krull
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
| | - Arno Kwade
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
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Dinius A, Kozanecka ZJ, Hoffmann KP, Krull R. Intensification of bioprocesses with filamentous microorganisms. PHYSICAL SCIENCES REVIEWS 2023. [DOI: 10.1515/psr-2022-0112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Abstract
Many industrial biotechnological processes use filamentous microorganisms to produce platform chemicals, proteins, enzymes and natural products. Product formation is directly linked to their cellular morphology ranging from dispersed mycelia over loose clumps to compact pellets. Therefore, the adjustment and control of the filamentous cellular morphology pose major challenges for bioprocess engineering. Depending on the filamentous strain and desired product, optimal morphological shapes for achieving high product concentrations vary. However, there are currently no overarching strain- or product-related correlations to improve process understanding of filamentous production systems. The present book chapter summarizes the extensive work conducted in recent years in the field of improving product formation and thus intensifying biotechnological processes with filamentous microorganisms. The goal is to provide prospective scientists with an extensive overview of this scientifically diverse, highly interesting field of study. In the course of this, multiple examples and ideas shall facilitate the combination of their acquired expertise with promising areas of future research. Therefore, this overview describes the interdependence between filamentous cellular morphology and product formation. Moreover, the currently most frequently used experimental techniques for morphological structure elucidation will be discussed in detail. Developed strategies of morphology engineering to increase product formation by tailoring and controlling cellular morphology and thus to intensify processes with filamentous microorganisms will be comprehensively presented and discussed.
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Affiliation(s)
- Anna Dinius
- Institute of Biochemical Engineering , Technische Universität Braunschweig , Rebenring 56 , 38106 Braunschweig , Germany
- Center of Pharmaceutical Engineering , Technische Universität Braunschweig , Franz-Liszt-Str. 35a , 38106 Braunschweig , Germany
| | - Zuzanna J. Kozanecka
- Institute of Biochemical Engineering , Technische Universität Braunschweig , Rebenring 56 , 38106 Braunschweig , Germany
- Center of Pharmaceutical Engineering , Technische Universität Braunschweig , Franz-Liszt-Str. 35a , 38106 Braunschweig , Germany
| | - Kevin P. Hoffmann
- Institute of Biochemical Engineering , Technische Universität Braunschweig , Rebenring 56 , 38106 Braunschweig , Germany
- Center of Pharmaceutical Engineering , Technische Universität Braunschweig , Franz-Liszt-Str. 35a , 38106 Braunschweig , Germany
| | - Rainer Krull
- Institute of Biochemical Engineering , Technische Universität Braunschweig , Rebenring 56 , 38106 Braunschweig , Germany
- Center of Pharmaceutical Engineering , Technische Universität Braunschweig , Franz-Liszt-Str. 35a , 38106 Braunschweig , Germany
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Recent Advances in Chitin Biosynthesis Associated with the Morphology and Secondary Metabolite Synthesis of Filamentous Fungi in Submerged Fermentation. J Fungi (Basel) 2023; 9:jof9020205. [PMID: 36836319 PMCID: PMC9967639 DOI: 10.3390/jof9020205] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 02/01/2023] [Accepted: 02/02/2023] [Indexed: 02/08/2023] Open
Abstract
Metabolites produced by filamentous fungi are used extensively in the food and drug industries. With the development of the morphological engineering of filamentous fungi, numerous biotechnologies have been applied to alter the morphology of fungal mycelia and enhance the yields and productivity of target metabolites during submerged fermentation. Disruption of chitin biosynthesis can modify the cell growth and mycelial morphology of filamentous fungi and regulate the biosynthesis of metabolites during submerged fermentation. In this review, we present a comprehensive coverage of the categories and structures of the enzyme chitin synthase, chitin biosynthetic pathways, and the association between chitin biosynthesis and cell growth and metabolism in filamentous fungi. Through this review, we hope to increase awareness of the metabolic engineering of filamentous fungal morphology, provide insights into the molecular mechanisms of morphological control via chitin biosynthesis, and describe strategies for the application of morphological engineering to enhance the production of target metabolites in filamentous fungi during submerged fermentation.
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Itani A, Shida Y, Ogasawara W. A microfluidic device for simultaneous detection of enzyme secretion and elongation of a single hypha. Front Microbiol 2023; 14:1125760. [PMID: 36937311 PMCID: PMC10020217 DOI: 10.3389/fmicb.2023.1125760] [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: 12/16/2022] [Accepted: 02/16/2023] [Indexed: 03/06/2023] Open
Abstract
Filamentous fungi grow through elongation of their apical region by exocytosis and secrete enzymes that can be of commercial or industrial importance. Their hyphae exhibit extensive branching, making it difficult to control hyphal growth for observation and analysis. Therefore, although hyphal morphology and productivity are closely related, the relationship between the two has not yet been clarified. Conventional morphology and productivity studies have only compared the results of macro imaging of fungal pellets cultured in bulk with the averaged products in the culture medium. Filamentous fungi are multicellular and their expression differs between different hyphae. To truly understand the relationship between morphology and productivity, it is necessary to compare the morphology and productivity of individual hyphae. To achieve this, we developed a microfluidic system that confines hyphae to individual channels for observation and investigated the relationship between their growth, morphology, and enzyme productivity. Furthermore, using Trichoderma reesei, a potent cellulase-producing fungus, as a model, we developed a cellulase detection assay with 4-MUC substrate to detect hyphal growth and enzyme secretion in a microfluidic device in real time. Using a strain that expresses cellobiohydrolase I (CBH I) fused with AcGFP1, we compared fluorescence from the detection assay with GFP fluorescence intensity, which showed a strong correlation between the two. These results indicate that extracellular enzymes can be easily detected in the microfluidic device in real time because the production of cellulase is synchronized in T. reesei. This microfluidic system enables real-time visualization of the dynamics of hypha and enzymes during carbon source exchange and the quantitative dynamics of gene expression. This technology can be applied to many biosystems from bioenergy production to human health.
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Affiliation(s)
- Ayaka Itani
- Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Japan
| | - Yosuke Shida
- Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Japan
- *Correspondence: Yosuke Shida,
| | - Wataru Ogasawara
- Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Japan
- Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, Japan
- Wataru Ogasawara,
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Effect of Microparticles on Fungal Fermentation for Fermentation-Based Product Productions. Processes (Basel) 2022. [DOI: 10.3390/pr10122681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Ranging from simple food ingredients to complex pharmaceuticals, value-added products via microbial fermentation have many advantages over their chemically synthesized alternatives. Some of such advantages are environment-friendly production pathways, more specificity in the case of enzymes as compared to the chemical catalysts and reduction of harmful chemicals, such as heavy metals or strong acids and bases. Fungal fermentation systems include yeast and filamentous fungal cells based on cell morphology and culture conditions. However, filamentous fungal fermentation has gained attention in the past few decades because of the diversity of microbial products and robust production of some of the most value-added commodities. This type of fungal fermentation is usually carried out by solid-state fermentation. However, solid-state fermentation poses problems during the scale-up for industrial production. Therefore, submerged fermentation for value-added products is usually preferred for scaling-up purposes. The main problem with submerged fungal fermentation is the formation of complex mycelial clumps or pellets. The formation of such pellets increases the viscosity of the media and hinders the efficient transfer of oxygen and nutrient resources in the liquid phase. The cells at the center of the clump or pellet start to die because of a shortage of resources and, thus, productivity decreases substantially. To overcome this problem, various morphological engineering techniques are being researched. One approach is the use of microparticles. Microparticles are inert particles with various size ranges that are used in fermentation. These microparticles are shown to have positive effects, such as high enzyme productivity or smaller pellets with fungal fermentation. Therefore, this review provides a background about the types of microparticles and summarizes some of the recent studies with special emphasis on the fungal morphology changes and microparticle types along with the applications of microparticles in filamentous fungal fermentations.
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Timoumi A, Nguyen TC, Le T, Kraiem H, Cescut J, Anne-Archard D, Gorret N, Molina-Jouve C, To KA, Fillaudeau L. Comparison of methods to explore the morphology and granulometry of biological particles with complex shapes: Interpretation and limitations. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.118067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Vali N, Fatemi SSA, Alinaghi M. Optimization of ultrasound-assisted production of ergosterol from Penicillium brevicompactum by Taguchi statistical method. Biotechnol Lett 2022; 44:1217-1230. [PMID: 36057882 DOI: 10.1007/s10529-022-03297-0] [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: 05/26/2022] [Accepted: 08/07/2022] [Indexed: 11/02/2022]
Abstract
Ergosterol as a primary metabolite and precursor of vitamin D2, is the most plentiful mycosterols in fungal cell membrane. Process optimization to increase the yield and productivity of biological products is a topic of interest. Ultrasonic waves have many applications in biotechnology, like cell disruption, and enhancement of primary and secondary metabolites production. This study disclosed an optimal condition for ultrasound-assisted production (UAP) of ergosterol from Penicillium brevicompactum MUCL 19,011 using L9 Taguchi statistical method. The intensity (IS), time of sonication (TS), treatment frequency (TF), and number of days of treatment (DT) were allocated to study the effects of ultrasound on ergosterol production. The results were analyzed using Minitab version 19. The maximum ergosterol, 11 mg/g cell dry weight (CDW), was produced on the tenth day while all factors were at a low level. The days of treatment with a contribution of 45.48% was the most significant factor for ergosterol production. For the first time, this study revealed the positive effect of ultrasound on the production of ergosterol. Ergosterol production increased 73% (4.63 mg/g CDW) after process optimization. Finally, a mathematical model of ultrasound factors with a regression coefficient of R2 = 0.978 was obtained for the ergosterol production during ultrasound treatment.
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Affiliation(s)
- Nasim Vali
- Department of Systems Biotechnology, Institute of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran.,Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran
| | - Seyed-Safa-Ali Fatemi
- Department of Systems Biotechnology, Institute of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran.
| | - Masoumeh Alinaghi
- Department of Food Science, Aarhus University, Agro Food Park 48, 8200 Aarhus N, Aarhus, Denmark
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Disruption of the Chitin Biosynthetic Pathway Results in Significant Changes in the Cell Growth Phenotypes and Biosynthesis of Secondary Metabolites of Monascus purpureus. J Fungi (Basel) 2022; 8:jof8090910. [PMID: 36135635 PMCID: PMC9503372 DOI: 10.3390/jof8090910] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/23/2022] [Accepted: 08/25/2022] [Indexed: 11/16/2022] Open
Abstract
In this study, the gene monascus-5162 from Monascus purpureus LQ-6, identified as chitin synthase gene VI (chs6), was knocked out to disrupt the chitin biosynthetic pathway and regulate the biosynthesis of Monascus pigments (MPs) and citrinin. The results showed that the aerial hyphae on a solid medium were short and sparse after the deletion of chs6 in M. purpureus LQ-6, significantly reducing the germination percentage of active spores to approximately 22%, but the colony diameter was almost unaffected. Additionally, the deletion of chs6 changed the mycelial morphology of M. purpureus LQ-6 during submerged fermentation and increased its sensitivity to environmental factors. MP and citrinin biosynthesis was dramatically inhibited in the recombinant strain. Furthermore, comparative transcriptome analysis revealed that the pathways related to spore development and growth, including the MAPK signaling pathway, chitin biosynthetic pathway, and regulatory factors LaeA and WetA genes, were significantly downregulated in the early phase of fermentation. The mRNA expression levels of genes in the cluster of secondary metabolites were significantly downregulated, especially those related to citrinin biosynthesis. This is the first detailed study to reveal that chs6 plays a vital role in regulating the cell growth and secondary metabolism of the Monascus genus.
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Wen Y, Liao B, Yan X, Wu Z, Tian X. Temperature-responsive regulation of the fermentation of hypocrellin A by Shiraia bambusicola (GDMCC 60438). Microb Cell Fact 2022; 21:135. [PMID: 35787717 PMCID: PMC9254528 DOI: 10.1186/s12934-022-01862-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 06/24/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Hypocrellin A (HA) is a perylene quinone pigment with high medicinal value that is produced by Shiraia bambusicola Henn. (S. bambusicola) and Hypocrella bambusae (Berk. & Broome) Sacc. (Ascomycetes) with great potential in clinical photodynamic therapy. Submerged cultivation of S. bambusicola is a popular technique for HA production. However, there is not much research on how temperature changes lead to differential yields of HA production. RESULTS The temperature regulation of submerged fermentation is an efficient approach to promote HA productivity. After a 32 °C fermentation, the HA content in the mycelia S. bambusicola (GDMCC 60438) was increased by more than three- and fivefold when compared to that at 28 °C and 26 °C, respectively. RNA sequencing (RNA-seq) analysis showed that the regulation of the expression of transcription factors and genes essential for HA biosynthesis could be induced by high temperature. Among the 496 differentially expressed genes (DEGs) explicitly expressed at 32 °C, the hub genes MH01c06g0046321 and MH01c11g0073001 in the coexpression network may affect HA biosynthesis and cytoarchitecture, respectively. Moreover, five genes, i.e., MH01c01g0006641, MH01c03g0017691, MH01c04g0029531, MH01c04g0030701 and MH01c22g0111101, potentially related to HA synthesis also exhibited significantly higher expression levels. Morphological observation showed that the autolysis inside the mycelial pellets tightly composted intertwined mycelia without apparent holes. CONCLUSIONS The obtained results provide an effective strategy in the submerged fermentation of S. bambusicola for improved HA production and reveal an alternative regulatory network responsive to the biosynthesis metabolism of HA in response to environmental signals.
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Affiliation(s)
- Yongdi Wen
- Guangdong Key Laboratory of Fermentation & Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, 382 East Out Loop, University Park, Guangzhou, 510006, China
| | - Baosheng Liao
- The Second Clinical College, Guangzhou University of Chinese Medicine, 232 East Out Loop, University Park, Guangzhou, 510006, China
| | - Xiaoxiao Yan
- Zhuhai Institute of Modern Industrial Innovation, South China University of Technology, 8 Fushan Road, Fushan Industrial Park, Zhuhai, 519100, China
| | - Zhenqiang Wu
- Guangdong Key Laboratory of Fermentation & Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, 382 East Out Loop, University Park, Guangzhou, 510006, China
| | - Xiaofei Tian
- Guangdong Key Laboratory of Fermentation & Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, 382 East Out Loop, University Park, Guangzhou, 510006, China. .,Zhuhai Institute of Modern Industrial Innovation, South China University of Technology, 8 Fushan Road, Fushan Industrial Park, Zhuhai, 519100, China.
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11
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Huang Z, Hu T, Liu H, Xie H, Tian X, Wu Z. Biosynthesis and polyketide oxidation of Monascus red pigments in an integrated fermentation system with microparticles and surfactants. Food Chem 2022; 394:133545. [PMID: 35759840 DOI: 10.1016/j.foodchem.2022.133545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 06/04/2022] [Accepted: 06/19/2022] [Indexed: 11/04/2022]
Abstract
Monascus red pigments are widely used in the food industry, mainly as intracellular red pigments. The low yields of extracellular red pigments (ERPs) make them unsuitable for large-scale industrial production. Herein, a novel integrated fermentation system (IFS) consisting of sodium starch octenyl succinate and Triton X-100 was explored for increasing yield, resulting in an ERP yield of 126.7 U/mL, 82.6% higher production than controls (69.4 U/mL). Major ERP components in control fermentations were monascopyridine A and monascopyridine B, but dehydro derivatives, rubropunctamine and monascorubramine, predominated in the test fermentations, presumably due to polyketide oxidation induced by Triton X-100. Improvement of hyphal morphology, membrane permeability, respiratory activity, and gene expression for red pigment biosynthesis is likely to be critical to increase yield and change the compositions. This study provides an effective strategy to accelerate the biosynthesis and secretion of Monascus pigments.
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Affiliation(s)
- Zhenfeng Huang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Tingting Hu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Haiqing Liu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China; Pan Asia (Jiangmen) Institute of Biological Engineering and Health, Jiangmen 529080, China
| | - Huixin Xie
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Xiaofei Tian
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, Guangzhou 510006, China
| | - Zhenqiang Wu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China.
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Soerjawinata W, Kockler I, Wommer L, Frank R, Schüffler A, Schirmeister T, Ulber R, Kampeis P. Novel bioreactor internals for the cultivation of spore‐forming fungi in pellet form. Eng Life Sci 2022; 22:474-483. [PMID: 35865648 PMCID: PMC9288991 DOI: 10.1002/elsc.202100094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 02/07/2022] [Accepted: 02/10/2022] [Indexed: 11/18/2022] Open
Abstract
This study introduced an automated long‐term fermentation process for fungals grown in pellet form. The goal was to reduce the overgrowth of bioreactor internals and sensors while better rheological properties in the fermentation broth, such as oxygen transfer and mixing time, can be achieved. Because this could not be accomplished with continuous culture and fed‐batch fermentation, repeated‐batch fermentation was implemented with the help of additional bioreactor internals (“sporulation supports”). This should capture some biomass during fermentation. After harvesting the suspended biomass, intermediate cleaning was performed using a cleaning device. The biomass retained on the sporulation support went through the sporulation phase. The spores were subsequently used as inocula for the next batch. The reason for this approach was that the retained pellets could otherwise cause problems (e.g., overgrowth on sensors) in subsequent batches because the fungus would then show undesirable hyphal growth. Various sporulation supports were tested for sufficient biomass fixation to start the next batch. A reproducible spore concentration within the range of the requirements could be achieved by adjusting the sporulation support (design and construction material), and an intermediate cleaning adapted to this.
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Affiliation(s)
- Winda Soerjawinata
- Institute for Biotechnical Process Design Trier University of Applied Sciences, Environmental Campus Birkenfeld Hoppstädten‐Weiersbach Germany
| | - Isabelle Kockler
- Institute for Biotechnical Process Design Trier University of Applied Sciences, Environmental Campus Birkenfeld Hoppstädten‐Weiersbach Germany
| | - Lars Wommer
- Institute for Biotechnical Process Design Trier University of Applied Sciences, Environmental Campus Birkenfeld Hoppstädten‐Weiersbach Germany
| | - Robert Frank
- Institute for Biotechnical Process Design Trier University of Applied Sciences, Environmental Campus Birkenfeld Hoppstädten‐Weiersbach Germany
| | - Anja Schüffler
- Institut für Biotechnologie und Wirkstoff‐Forschung gGmbH (IBWF) Mainz Germany
| | - Tanja Schirmeister
- Institute of Pharmaceutical and Biomedical Sciences Johannes Gutenberg University of Mainz Mainz Germany
| | - Roland Ulber
- Institute of Bioprocess Engineering Technical University Kaiserslautern Kaiserslautern Germany
| | - Percy Kampeis
- Institute for Biotechnical Process Design Trier University of Applied Sciences, Environmental Campus Birkenfeld Hoppstädten‐Weiersbach Germany
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Mohamed H, Awad MF, Shah AM, Nazir Y, Naz T, Hassane A, Nosheen S, Song Y. Evaluation of Different Standard Amino Acids to Enhance the Biomass, Lipid, Fatty Acid, and γ-Linolenic Acid Production in Rhizomucor pusillus and Mucor circinelloides. Front Nutr 2022; 9:876817. [PMID: 35592629 PMCID: PMC9112836 DOI: 10.3389/fnut.2022.876817] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 03/31/2022] [Indexed: 11/13/2022] Open
Abstract
In this study, 18 standard amino acids were tested as a single nitrogen source on biomass, total lipid, total fatty acid (TFA) production, and yield of γ-linolenic acid (GLA) in Rhizomucor pusillus AUMC 11616.A and Mucor circinelloides AUMC 6696.A isolated from unusual habitats. Grown for 4 days at 28°C, shaking at 150 rpm, the maximum fungal biomass for AUMC 6696.A was 14.6 ± 0.2 g/L with arginine and 13.68 ± 0.1 g/L with asparagine, when these amino acids were used as single nitrogen sources, while AUMC 11616.A maximum biomass was 10.73 ± 0.8 g/L with glycine and 9.44 ± 0.6 g/L with valine. These were significantly higher than the ammonium nitrate control (p < 0.05). The highest levels of TFA were achieved with glycine for AUMC 11616.A, 26.2 ± 0.8% w/w of cell dry weight, and glutamic acid for AUMC 6696.A, 23.1 ± 1.3%. The highest GLA yield was seen with proline for AUMC 11616.A, 13.4 ± 0.6% w/w of TFA, and tryptophan for AUMC 6696.A, 12.8 ± 0.3%, which were 38% and 25% higher than the ammonium tartrate control. The effects of environmental factors such as temperature, pH, fermentation time, and agitation speed on biomass, total lipids, TFA, and GLA concentration of the target strains have also been investigated. Our results demonstrated that nitrogen assimilation through amino acid metabolism, as well as the use of glucose as a carbon source and abiotic factors, are integral to increasing the oleaginicity of tested strains. Few studies have addressed the role of amino acids in fermentation media, and this study sheds light on R. pusillus and M. circinelloides as promising candidates for the potential applications of amino acids as nitrogen sources in the production of lipids.
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Affiliation(s)
- Hassan Mohamed
- Colin Ratledge Center for Microbial Lipids, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, China
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Assiut, Egypt
- *Correspondence: Hassan Mohamed,
| | - Mohamed F. Awad
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Assiut, Egypt
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
| | - Aabid Manzoor Shah
- Colin Ratledge Center for Microbial Lipids, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, China
| | - Yusuf Nazir
- Colin Ratledge Center for Microbial Lipids, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, China
- Department of Food Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Tahira Naz
- Colin Ratledge Center for Microbial Lipids, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, China
| | - Abdallah Hassane
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Assiut, Egypt
| | - Shaista Nosheen
- Colin Ratledge Center for Microbial Lipids, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, China
| | - Yuanda Song
- Colin Ratledge Center for Microbial Lipids, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, China
- Yuanda Song,
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14
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Adsul MG, Dixit P, Saini JK, Gupta RP, Ramakumar SSV, Mathur AS. Morphologically favorable mutant of Trichoderma reesei for low viscosity cellulase production. Biotechnol Bioeng 2022; 119:2167-2181. [PMID: 35470437 DOI: 10.1002/bit.28121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 04/22/2022] [Indexed: 11/07/2022]
Abstract
Metabolite production by filamentous fungi hampered because of high viscosity generated during growth. Low viscosity fermentation by mold is one of the preferred ways of large scale enzymes production. Cellulolytic enzymes play a key role during the process of lignocellulosic biomass conversion. In this study a mutant RC-23-1 was isolated through mutagenesis (diethyl sulfate followed by UV) of T. reesei RUT-C30. RC-23-1 not only gave higher cellulase production but also generated lower viscosity during enzyme production. Viscosity of mutant growth was more than three times lower than parent strain. RC-23-1 shows unique, yeast like colony morphology on solid media and small pellet like growth in liquid media. This mutant did not spread like mold on solid media. This mutant produces cellulases constitutively when grown in sugars. Using only glucose, the cellulase production was 4.1 FPU/ml. Among polysaccharides (avicel, xylan and pectin), avicel gave maximum of 6.2 FPU/ml and pretreated biomass (rice straw, wheat straw and sugarcane bagasse) produced 5.1-5.8 FPU/ml. At 7L scale reactor, fed-batch process was designed for cellulase production using different carbon and nitrogen sources. Maximum yield of cellulases was 182 FPU/g of lactose consumed was observed in fed-batch process. The produced enzyme used for hydrolysis of acid pretreated rice straw (20% solid loading) and maximum of 60 % glucan conversion was observed. RC-23-1 mutant is good candidate for large scale cellulase production and could be a model strain to study mold to yeast-like transformation. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Mukund G Adsul
- DBT-IOC Centre for Advanced Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad, 121007, India
| | - Pooja Dixit
- DBT-IOC Centre for Advanced Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad, 121007, India
| | - Jitendra K Saini
- DBT-IOC Centre for Advanced Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad, 121007, India
| | - Ravi P Gupta
- DBT-IOC Centre for Advanced Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad, 121007, India
| | - S S V Ramakumar
- DBT-IOC Centre for Advanced Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad, 121007, India
| | - Anshu S Mathur
- DBT-IOC Centre for Advanced Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad, 121007, India
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15
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Fungal morphology: a challenge in bioprocess engineering industries for product development. Curr Opin Chem Eng 2022. [DOI: 10.1016/j.coche.2021.100729] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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16
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Bangar SP, Suri S, Trif M, Ozogul F. Organic acids production from lactic acid bacteria: A preservation approach. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101615] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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17
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Zheng Z, Ali A, Su J, Zhang S, Fan Y, Sun Y. Self-immobilized biochar fungal pellet combined with bacterial strain H29 enhanced the removal performance of cadmium and nitrate. BIORESOURCE TECHNOLOGY 2021; 341:125803. [PMID: 34455245 DOI: 10.1016/j.biortech.2021.125803] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 08/12/2021] [Accepted: 08/14/2021] [Indexed: 06/13/2023]
Abstract
A newly isolated strain Phoma sp. ZJ6, which could form fungal pellet (FP) by self-immobilization, was identified. A novel longan seed biochar embedded in FP (BFP) combined with strain H29 (BFP-H29) effectively improved the Cd(II) removal efficiency and simultaneously removed nitrate. The adsorption process of BFP was well fitted with the pseudo-second-order kinetics model and Langmuir isotherm model, which demonstrated that the adsorption process was favorable and mainly dominated by chemisorption. Compared with single FP, biochar, and strain H29, BFP-H29 significantly enhanced the Cd(II) removal and the removal ratio reached 90.47%. Meanwhile, the simultaneous removal efficiency of the BFP-H29 for nitrate could reach 93.80%. Characterization analysis demonstrated that the primary removal mechanisms of BFP-H29 were precipitation and surface complexation. BFP-H29 had excellent performance in simultaneous removal of Cd(II) and nitrate, indicating its potential as a promising composite in the removal of cadmium and nitrate in wastewater.
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Affiliation(s)
- Zhijie Zheng
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Amjad Ali
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Junfeng Su
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Shuai Zhang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Yuanyuan Fan
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Yi Sun
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
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18
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Li S, Bobbala S, Vincent MP, Modak M, Liu Y, Scott EA. Pi-stacking Enhances Stability, Scalability of Formation, Control over Flexibility and Circulation Time of Polymeric Filaments. ADVANCED NANOBIOMED RESEARCH 2021; 1:2100063. [PMID: 34870281 PMCID: PMC8635300 DOI: 10.1002/anbr.202100063] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Self-assembling filomicelles (FM) are of great interest to nanomedicine due to their structural flexibility, extensive systemic circulation time, and amenability to unique "cylinder-to-sphere" morphological transitions. However, current fabrication techniques for FM self-assembly are highly variable and difficult to scale. Here, we demonstrate that tetrablock copolymers composed of poly(ethylene glycol)-b-poly(propylene sulfide) (PEG-b-PPS) diblocks linked by a pi-stacking perylene bisimide (PBI) moiety permit rapid, scalable, and facile assembly of FM via the flash nanoprecipitation (FNP) method. Co-assembling the tetrablocks and PEG-b-PPS diblocks at different molar ratios resulted in mixed PBI-containing FM (mPBI-FM) with tunable length and flexibility. The flexibility of mPBI-FM can be optimized to decrease uptake by macrophages in vivo, leading to increased circulation time versus (-)PBI-FM without PBI tetrablocks after intravenous administration in mice. While PEG-b-PPS diblocks form FM within a narrow range of hydrophilic weight fractions, incorporation of pi-stacking PBI groups expanded this range to increase favorability of FM assembly. Furthermore, the aggregation-dependent fluorescence of PBI shifted during oxidation-induced "cylinder-to-sphere" transitions of mPBI-FM into micelles, resulting in a distinct emission wavelength for filamentous versus spherical nanostructures. Thus, incorporation of pi-stacking allows for rapid, scalable assembly of FM with tunable flexibility and stability for theranostic and nanomedicine applications.
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Affiliation(s)
- Sophia Li
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - Sharan Bobbala
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - Michael P Vincent
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - Mallika Modak
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - Yugang Liu
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - Evan A Scott
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
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19
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Schamberger B, Plaetzer K. Photofungizides Based on Curcumin and Derivates Thereof against Candida albicans and Aspergillus niger. Antibiotics (Basel) 2021; 10:1315. [PMID: 34827253 PMCID: PMC8614998 DOI: 10.3390/antibiotics10111315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/14/2021] [Accepted: 10/20/2021] [Indexed: 11/16/2022] Open
Abstract
Fungal infections in humans, contamination of food and structural damage to buildings by fungi are associated with high costs for the general public. In addition, the increase in antifungal resistance towards conventional treatment raises the demand for new fungicidal methods. Here, we present the antifungal use of Photodynamic Inactivation (PDI) based on the natural photosensitizer curcumin and a water-soluble positively charged derivative thereof (SA-CUR 12a) against two different model organisms; Candida albicans grown in a liquid culture and photo treated with a 435 nm LED light followed by counting of the colony-forming units and photoinactivation of tissue-like hyphal spheres of Aspergillus niger (diameter ~5 mm) with subsequent monitoring of colony growth. Curcumin (50 µM, no incubation period, i.p.) supplemented with 10% or 0.5% DMSO as well as SA-CUR 12a (50 µM no i.p or 5 min i.p.) triggered a photoantifungal effect of >4 log units towards C. albicans. At 100 µM, SA-CUR 12a (0 min or 5 min i.p.) achieved a reduction of >6 log units. Colonies of A. niger shrunk significantly during PDI treatment. Photoinactivation with 50 µM or 100 µM curcumin (+0.5% DMSO) resulted in complete growth inhibition. PDI using 20, 50 or 100 µM SA-CUR 12a (with or without 10% DMSO) also showed a significant reduction in colony area compared to the control after 48 h, although less pronounced compared to curcumin. In summary, PDI using curcumin or SA-CUR 12a against C. albicans or A. niger is a promising alternative to currently used fungicides, with the advantage of being very unlikely to induce resistance.
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Affiliation(s)
- Barbara Schamberger
- Laboratory of Photodynamic Inactivation of Microorganisms, Department of Biosciences, Paris Lodron University of Salzburg, 5020 Salzburg, Austria;
- Morphophysics Group, Department of Chemistry and Physics of Materials, Paris Lodron University of Salzburg, 5020 Salzburg, Austria
| | - Kristjan Plaetzer
- Laboratory of Photodynamic Inactivation of Microorganisms, Department of Biosciences, Paris Lodron University of Salzburg, 5020 Salzburg, Austria;
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20
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Fungal Lysine Deacetylases in Virulence, Resistance, and Production of Small Bioactive Compounds. Genes (Basel) 2021; 12:genes12101470. [PMID: 34680865 PMCID: PMC8535771 DOI: 10.3390/genes12101470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 09/20/2021] [Indexed: 12/13/2022] Open
Abstract
The growing number of immunocompromised patients begs for efficient therapy strategies against invasive fungal infections. As conventional antifungal treatment is increasingly hampered by resistance to commonly used antifungals, development of novel therapy regimens is required. On the other hand, numerous fungal species are industrially exploited as cell factories of enzymes and chemicals or as producers of medically relevant pharmaceuticals. Consequently, there is immense interest in tapping the almost inexhaustible fungal portfolio of natural products for potential medical and industrial applications. Both the pathogenicity and production of those small metabolites are significantly dependent on the acetylation status of distinct regulatory proteins. Thus, classical lysine deacetylases (KDACs) are crucial virulence determinants and important regulators of natural products of fungi. In this review, we present an overview of the members of classical KDACs and their complexes in filamentous fungi. Further, we discuss the impact of the genetic manipulation of KDACs on the pathogenicity and production of bioactive molecules. Special consideration is given to inhibitors of these enzymes and their role as potential new antifungals and emerging tools for the discovery of novel pharmaceutical drugs and antibiotics in fungal producer strains.
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21
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Zhang Q, Xiong Z, Sun L, Tian X, Tian G, Yang Y, Li X, Wang Y, Chu J. Effect of biosurfactant sophorolipids on Rhizomucor miehei lipase fermentation by Aspergillus oryzae. BIORESOUR BIOPROCESS 2021; 8:84. [PMID: 38650294 PMCID: PMC10991578 DOI: 10.1186/s40643-021-00433-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 08/18/2021] [Indexed: 11/10/2022] Open
Abstract
In this study, the effect of biosurfactant sophorolipids (SLs) on Rhizomucor miehei lipase (RML) fermentation by Aspergillus oryzae was investigated. With the exogenous addition of 0.3% (w/v) SLs in the initial medium, the RML activity reached 430.0 U/mL, an increase of 25.0% compared to the control group. Subsequently, the physiological metabolic responses of A. oryzae to the addition of SLs were further explored. The results showed that though SLs had almost no effect on the RML secretion, it would affect the morphology of the cells. During the late phase of the fermentation, the proportion of middle pellets, which was generally considered as an energetic and stable state for enzyme production was increased with the addition of SLs. Simultaneously, the viscosity of fermentation broth was reduced, which facilitated the increase of oxygen transfer, thereby improving the RML production. Finally, it could be found that the addition of SLs significantly increased the contents of precursor amino acids, especially for those rank first and second of the RML composition, and it could promote the synthesis of RML.
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Affiliation(s)
- Qianqian Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, P.O. box 329, Shanghai, 200237, People's Republic of China
| | - Zhiyue Xiong
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, P.O. box 329, Shanghai, 200237, People's Republic of China
| | - Lei Sun
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, P.O. box 329, Shanghai, 200237, People's Republic of China
| | - Xiwei Tian
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, P.O. box 329, Shanghai, 200237, People's Republic of China
| | - Guiwei Tian
- Wilmar Biotechnology R&D Center Co., Ltd, Shanghai, 200137, China
| | - Yiming Yang
- Wilmar Biotechnology R&D Center Co., Ltd, Shanghai, 200137, China
| | - Xu Li
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, P.O. box 329, Shanghai, 200237, People's Republic of China.
| | - Yonghong Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, P.O. box 329, Shanghai, 200237, People's Republic of China
| | - Ju Chu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, P.O. box 329, Shanghai, 200237, People's Republic of China.
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22
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Huang ZF, Yang SZ, Liu HQ, Tian XF, Wu ZQ. Sodium starch octenyl succinate facilitated the production of water-soluble yellow pigments in Monascus ruber fermentation. Appl Microbiol Biotechnol 2021; 105:6691-6706. [PMID: 34463799 DOI: 10.1007/s00253-021-11512-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 07/26/2021] [Accepted: 07/28/2021] [Indexed: 11/28/2022]
Abstract
Natural water-soluble Monascus pigments (WSMPs) have been in increasing demand but have not been able to achieve industrial production due to the low production rate. This study aimed to improve the biosynthesis and secretion of extracellular yellow pigments (EYPs) through submerged fermentation with Monascus ruber CGMCC 10,910 supplemented with sodium starch octenyl succinate (OSA-SNa). The results demonstrated that the yield was 69.68% and 48.89% higher than that without OSA-SNa in conventional fermentation (CF) and extractive fermentation (EF), respectively. The mainly increased EYP components were Y3 and Y4 in CF, but they were mainly Y1 and Y2 as well as secreted intracellular pigments, including Y5, Y6, O1, and O2, in EF. Scanning electron microscopy analysis revealed that the mycelium presented an uneven surface profile with obvious wrinkles and small fragments with OSA-SNa. It was found that a higher unsaturated/saturated fatty acids ratio in the cell membrane resulted in increased permeability and facilitated the export of intracellular yellow pigments into the broth with OSA-SNa treatment. In addition, a higher NAD+/NADH ratio and glucose-6-phosphate dehydrogenase activity provided a reducing condition for yellow pigment biosynthesis. Gene expression analysis showed that the expression levels of the key genes for yellow pigment biosynthesis were significantly upregulated by OSA-SNa. This study provides an effective strategy to promote the production of WSMPs by microparticle-enhanced cultivation using OSA-SNa. KEY POINTS: • OSA-SNa addition facilitated the production of Monascus yellow pigments. • Mycelial morphology and membrane permeability were affected by OSA-SNa. • The key gene expression of yellow pigments was upregulated.
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Affiliation(s)
- Zhen-Feng Huang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Shan-Zhong Yang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Hai-Qing Liu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.,Pan Asia (Jiangmen) Institute of Biological Engineering and Health, Jiangmen, 529080, China
| | - Xiao-Fei Tian
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.,Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, Guangzhou, 510006, China
| | - Zhen-Qiang Wu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.
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23
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Soerjawinata W, Schlegel K, Fuchs N, Schüffler A, Schirmeister T, Ulber R, Kampeis P. Applicability of a single-use bioreactor compared to a glass bioreactor for the fermentation of filamentous fungi and evaluation of the reproducibility of growth in pellet form. Eng Life Sci 2021; 21:324-339. [PMID: 33976605 PMCID: PMC8092982 DOI: 10.1002/elsc.202000069] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 01/22/2021] [Accepted: 02/12/2021] [Indexed: 12/01/2022] Open
Abstract
The implementation of single-use technologies offers several major advantages, e.g. prevention of cross-contamination, especially when spore-forming microorganisms are present. This study investigated the application of a single-use bioreactor in batch fermentation of filamentous fungus Penicillium sp. (IBWF 040-09) from the Institute of Biotechnology and Drug Research (IBWF), which is capable of intracellular production of a protease inhibitor against parasitic proteases as a secondary metabolite. Several modifications to the SU bioreactor were suggested in this study to allow the fermentation in which the fungus forms pellets. Simultaneously, fermentations in conventional glass bioreactor were also conducted as reference. Although there are significant differences in the construction material and gassing system, the similarity of the two types of bioreactors in terms of fungal metabolic activity and the reproducibility of fermentations could be demonstrated using statistic methods. Under the selected cultivation conditions, growth rate, yield coefficient, substrate uptake rate, and formation of intracellular protease-inhibiting substance in the single-use bioreactor were similar to those in the glass bioreactor.
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Affiliation(s)
- Winda Soerjawinata
- Institute for Biotechnical Process DesignTrier University of Applied Sciences, Environmental Campus BirkenfeldHoppstädten‐WeiersbachGermany
| | - Konstantin Schlegel
- Institute for Biotechnical Process DesignTrier University of Applied Sciences, Environmental Campus BirkenfeldHoppstädten‐WeiersbachGermany
| | - Natalie Fuchs
- Institute of Pharmaceutical and Biomedical SciencesJohannes Gutenberg University MainzMainzGermany
| | - Anja Schüffler
- Institut für Biotechnologie und Wirkstoff‐Forschung gGmbH (IBWF)MainzGermany
| | - Tanja Schirmeister
- Institute of Pharmaceutical and Biomedical SciencesJohannes Gutenberg University MainzMainzGermany
| | - Roland Ulber
- Institute of Bioprocess EngineeringTechnical University KaiserslauternKaiserslauternGermany
| | - Percy Kampeis
- Institute for Biotechnical Process DesignTrier University of Applied Sciences, Environmental Campus BirkenfeldHoppstädten‐WeiersbachGermany
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24
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Zhao Q, Liu Q, Wang Q, Qin Y, Zhong Y, Gao L, Liu G, Qu Y. Disruption of the Trichoderma reesei gul1 gene stimulates hyphal branching and reduces broth viscosity in cellulase production. J Ind Microbiol Biotechnol 2021; 48:6132311. [PMID: 33693788 PMCID: PMC9113457 DOI: 10.1093/jimb/kuab012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 02/05/2021] [Indexed: 12/03/2022]
Abstract
Hyphal morphology is considered to have a close relationship with the production
level of secreted proteins by filamentous fungi. In this study, the
gul1 gene, which encodes a putative mRNA-binding protein,
was disrupted in cellulase-producing fungus Trichoderma reesei.
The hyphae of Δgul1 strain produced more lateral
branches than the parent strain. Under the condition for cellulase production,
disruption of gul1 resulted in smaller mycelial clumps and
significantly lower viscosity of fermentation broth. In addition, cellulase
production was improved by 22% relative to the parent strain.
Transcriptome analysis revealed that a set of genes encoding cell wall
remodeling enzymes as well as hydrophobins were differentially expressed in the
Δgul1 strain. The results suggest that the
regulatory role of gul1 in cell morphogenesis is likely
conserved in filamentous fungi. To our knowledge, this is the first report on
the engineering of gul1 in an industrially important
fungus.
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Affiliation(s)
- Qinqin Zhao
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, 266237 Qingdao, China
| | - Qin Liu
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, 266237 Qingdao, China
| | - Qi Wang
- National Glycoengineering Research Center, Shandong University, 27 Binhai Road, 266237 Qingdao, China
| | - Yuqi Qin
- National Glycoengineering Research Center, Shandong University, 27 Binhai Road, 266237 Qingdao, China
| | - Yaohua Zhong
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, 266237 Qingdao, China
| | - Liwei Gao
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, 266237 Qingdao, China.,Tobacco Research Institute of Chinese Academy of Agricultural Sciences, 11 Keyuanjingsi Road, 266101 Qingdao, China
| | - Guodong Liu
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, 266237 Qingdao, China.,National Glycoengineering Research Center, Shandong University, 27 Binhai Road, 266237 Qingdao, China
| | - Yinbo Qu
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, 266237 Qingdao, China.,National Glycoengineering Research Center, Shandong University, 27 Binhai Road, 266237 Qingdao, China
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25
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Novy V, Nielsen F, Cullen D, Sabat G, Houtman CJ, Hunt CG. The characteristics of insoluble softwood substrates affect fungal morphology, secretome composition, and hydrolytic efficiency of enzymes produced by Trichoderma reesei. BIOTECHNOLOGY FOR BIOFUELS 2021; 14:105. [PMID: 33902680 PMCID: PMC8074412 DOI: 10.1186/s13068-021-01955-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 04/11/2021] [Indexed: 05/04/2023]
Abstract
BACKGROUND On-site enzyme production using Trichoderma reesei can improve yields and lower the overall cost of lignocellulose saccharification by exploiting the fungal gene regulatory mechanism that enables it to continuously adapt enzyme secretion to the substrate used for cultivation. To harness this, the interrelation between substrate characteristics and fungal response must be understood. However, fungal morphology or gene expression studies often lack structural and chemical substrate characterization. Here, T. reesei QM6a was cultivated on three softwood substrates: northern bleached softwood Kraft pulp (NBSK) and lodgepole pine pretreated either by dilute-acid-catalyzed steam pretreatment (LP-STEX) or mild alkaline oxidation (LP-ALKOX). With different pretreatments of similar starting materials, we presented the fungus with systematically modified substrates. This allowed the elucidation of substrate-induced changes in the fungal response and the testing of the secreted enzymes' hydrolytic strength towards the same substrates. RESULTS Enzyme activity time courses correlated with hemicellulose content and cellulose accessibility. Specifically, increased amounts of side-chain-cleaving hemicellulolytic enzymes in the protein produced on the complex substrates (LP-STEX; LP-ALKOX) was observed by secretome analysis. Confocal laser scanning micrographs showed that fungal micromorphology responded to changes in cellulose accessibility and initial culture viscosity. The latter was caused by surface charge and fiber dimensions, and likely restricted mass transfer, resulting in morphologies of fungi in stress. Supplementing a basic cellulolytic enzyme mixture with concentrated T. reesei supernatant improved saccharification efficiencies of the three substrates, where cellulose, xylan, and mannan conversion was increased by up to 27, 45, and 2800%, respectively. The improvement was most pronounced for proteins produced on LP-STEX and LP-ALKOX on those same substrates, and in the best case, efficiencies reached those of a state-of-the-art commercial enzyme preparation. CONCLUSION Cultivation of T. reesei on LP-STEX and LP-ALKOX produced a protein mixture that increased the hydrolytic strength of a basic cellulase mixture to state-of-the-art performance on softwood substrates. This suggests that the fungal adaptation mechanism can be exploited to achieve enhanced performance in enzymatic hydrolysis without a priori knowledge of specific substrate requirements.
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Affiliation(s)
- Vera Novy
- US Department of Agriculture, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI, 53726, USA.
- Department of Biology and Bioengineering, Division of Industrial Biotechnology, Chalmers University of Technology, Kemivägen 10, 412 96, Göteborg, Sweden.
| | - Fredrik Nielsen
- US Department of Agriculture, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI, 53726, USA
| | - Daniel Cullen
- US Department of Agriculture, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI, 53726, USA
| | - Grzegorz Sabat
- University of Wisconsin Biotechnology Center, Madison, WI, 53706, USA
| | - Carl J Houtman
- US Department of Agriculture, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI, 53726, USA
| | - Christopher G Hunt
- US Department of Agriculture, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI, 53726, USA
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Accelerated glucose metabolism in hyphae-dispersed Aspergillus oryzae is suitable for biological production. J Biosci Bioeng 2021; 132:140-147. [PMID: 33896702 DOI: 10.1016/j.jbiosc.2021.03.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/28/2021] [Accepted: 03/28/2021] [Indexed: 11/23/2022]
Abstract
Recently, a hyphae-dispersed type of filamentous fungus Aspergillus oryzae was constructed via genetic engineering, and industrial applications are expected due to the ease of handling and to the level of protein production properties. In this study, we constructed cellulase-expressing strains using wild-type and hyphae-dispersed strains to investigate the correlation between protein productivity and metabolism. Compared with the original strain, the hyphae-dispersed cellulase-expressing strain showed elevated cellulase activity, rapid glucose consumption, increased mycelial dry weight, an increased expression of cellulase genes, and activated respiration activity. Comparative metabolomic analysis showed fewer metabolites in the glycolysis and TCA cycles in the dispersed strains than in the original strains. These results indicate that the flux of carbohydrate metabolism in the hyphae-dispersed strains is smoother than that in the original strains. Such efficient metabolic flux would contribute to efficient energy conversion and to sufficient energy supply to anabolisms, such as mycelial growth and protein production. Our findings suggest that the hyphae-dispersed strains could be a useful host not only for protein production but also for the biological production of various chemicals such as organic acids.
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Böl M, Schrinner K, Tesche S, Krull R. Challenges of influencing cellular morphology by morphology engineering techniques and mechanical induced stress on filamentous pellet systems-A critical review. Eng Life Sci 2021; 21:51-67. [PMID: 33716605 PMCID: PMC7923580 DOI: 10.1002/elsc.202000060] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 09/25/2020] [Accepted: 09/29/2020] [Indexed: 11/30/2022] Open
Abstract
Filamentous microorganisms are main producers of organic acids, enzymes, and pharmaceutical agents such as antibiotics and other active pharmaceutical ingredients. With their complex cell morphology, ranging from dispersed mycelia to dense pellets, the cultivation is challenging. In recent years, various techniques for tailor-made cell morphologies of filamentous microorganisms have been developed to increase product formation and have been summarised under the term morphology engineering. These techniques, namely microparticle-enhanced cultivation, macroparticle-enhanced cultivation, and alteration of the osmolality of the culture medium by addition of inorganic salts, the salt-enhanced cultivation, are presented and discussed in this review. These techniques have already proven to be useful and now await further proof-of-concept. Furthermore, the mechanical behaviour of individual pellets is of special interest for a general understanding of pellet mechanics and the productivity of biotechnological processes with filamentous microorganisms. Correlating them with substrate uptake and finally with productivity would be a breakthrough not to be underestimated for the comprehensive characterisation of filamentous systems. So far, this research field is under-represented. First results on filamentous pellet mechanics are discussed and important future aspects, which the filamentous expert community should deal with, will be presented and critically discussed.
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Affiliation(s)
- Markus Böl
- Institute of Mechanics and AdaptronicsTechnische Universität BraunschweigBraunschweigGermany
- Center of Pharmaceutical Engineering (PVZ)Technische Universität BraunschweigBraunschweigGermany
| | - Kathrin Schrinner
- Center of Pharmaceutical Engineering (PVZ)Technische Universität BraunschweigBraunschweigGermany
- Institute of Biochemical EngineeringTechnische Universität BraunschweigBraunschweigGermany
| | - Sebastian Tesche
- Center of Pharmaceutical Engineering (PVZ)Technische Universität BraunschweigBraunschweigGermany
- Institute of Biochemical EngineeringTechnische Universität BraunschweigBraunschweigGermany
| | - Rainer Krull
- Center of Pharmaceutical Engineering (PVZ)Technische Universität BraunschweigBraunschweigGermany
- Institute of Biochemical EngineeringTechnische Universität BraunschweigBraunschweigGermany
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Ribeiro FDOS, de Araújo GS, Mendes MGA, Daboit TC, Brito LM, Pessoa C, de Lima LRM, de Paula RCM, Bastos RS, Rocha JA, de Brito Sa E, de Oliveira TC, de Jesus Oliveira AC, Sobrinho JLS, de Souza de Almeida Leite JR, de Araújo AR, da Silva DA. Structural characterization, antifungal and cytotoxic profiles of quaternized heteropolysaccharide from Anadenanthera colubrina. Int J Biol Macromol 2020; 165:279-290. [DOI: 10.1016/j.ijbiomac.2020.09.087] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 09/11/2020] [Accepted: 09/13/2020] [Indexed: 12/17/2022]
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29
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Yang SZ, Huang ZF, Liu HQ, Hu X, Wu ZQ. Improving mycelial morphology and adherent growth as well as metabolism of Monascus yellow pigments using nitrate resources. Appl Microbiol Biotechnol 2020; 104:9607-9617. [PMID: 33044600 DOI: 10.1007/s00253-020-10944-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 09/18/2020] [Accepted: 10/04/2020] [Indexed: 01/12/2023]
Abstract
Mycelial adhesion affects cell growth and the production of water-soluble extracellular yellow pigment (EYP) in submerged fermentation with Monascus ruber CGMCC 10910. Two nitrates, NaNO3 and KNO3, were used as nitrogen sources for mitigating mycelial adhesion and improving the production of EYP in this study. The results showed that the adhesion of mycelia in the fermentation broth significantly decreased by adding 5 g/L NaNO3, which prevented mycelia from attaching to the inner wall of the Erlenmeyer flask. It was suggested that NaNO3 reduced the total amount of extracellular polysaccharides, increased extracellular proteins, and decreased the viscosity of the fermentation broth. Scanning electron microscopy (SEM) analysis revealed that the mycelial morphology was shorter and more dispersed and vigorous under NaNO3 conditions than under the control conditions. The biomass increased by 49.2% and 45.4% with 5 g/L NaNO3 and 6 g/L KNO3 treatment, respectively, compared with that of the control, and the maximum production of EYP was 267.1 and 241.8 AU350, which increased by 70.0% and 53.9% compared with that of the control, respectively. Simultaneously, the ratios of intracellular yellow pigment to orange pigment increased significantly with 5 g/L of NaNO3 addition (p < 0.05). Genetic analysis found that the expression levels of the key genes for Monascus pigment biosynthesis were significantly upregulated by NaNO3 addition (p < 0.05 or p < 0.01). This study provides an effective strategy for the production of water-soluble Monascus yellow pigments.Key Points• Nitrate addition decreased mycelial adhesion and improved cell growth in Monascus pigment fermentation.• The biosynthesis genes of water-soluble extracellular yellow pigment (EYP) were upregulated by nitrate addition.• The mycelial morphology was significantly influenced to enhance EYP biosynthesis with nitrate addition.
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Affiliation(s)
- Shan-Zhong Yang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Zhen-Feng Huang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Hai-Qing Liu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.,Pan Asia (Jiangmen) Institute of Biological Engineering and Health, Jiangmen, 529080, China
| | - Xi Hu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Zhen-Qiang Wu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.
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30
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Effect of agitation speed and aeration rate on fructosyltransferase production of Aspergillus oryzae IPT-301 in stirred tank bioreactor. Biotechnol Lett 2020; 42:2619-2629. [DOI: 10.1007/s10529-020-03006-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 09/14/2020] [Indexed: 01/06/2023]
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Abstract
Aspergilli have been widely used in the production of organic acids, enzymes, and secondary metabolites for almost a century. Today, several GRAS (generally recognized as safe) Aspergillus species hold a central role in the field of industrial biotechnology with multiple profitable applications. Since the 1990s, research has focused on the use of Aspergillus species in the development of cell factories for the production of recombinant proteins mainly due to their natively high secretion capacity. Advances in the Aspergillus-specific molecular toolkit and combination of several engineering strategies (e.g., protease-deficient strains and fusions to carrier proteins) resulted in strains able to generate high titers of recombinant fungal proteins. However, the production of non-fungal proteins appears to still be inefficient due to bottlenecks in fungal expression and secretion machinery. After a brief overview of the different heterologous expression systems currently available, this review focuses on the filamentous fungi belonging to the genus Aspergillus and their use in recombinant protein production. We describe key steps in protein synthesis and secretion that may limit production efficiency in Aspergillus systems and present genetic engineering approaches and bioprocessing strategies that have been adopted in order to improve recombinant protein titers and expand the potential of Aspergilli as competitive production platforms.
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32
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Buffo MM, Esperança MN, Farinas CS, Badino AC. Relation between pellet fragmentation kinetics and cellulolytic enzymes production by Aspergillus niger in conventional bioreactor with different impellers. Enzyme Microb Technol 2020; 139:109587. [DOI: 10.1016/j.enzmictec.2020.109587] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 04/07/2020] [Accepted: 04/24/2020] [Indexed: 10/24/2022]
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Miyazawa K, Yoshimi A, Abe K. The mechanisms of hyphal pellet formation mediated by polysaccharides, α-1,3-glucan and galactosaminogalactan, in Aspergillus species. Fungal Biol Biotechnol 2020; 7:10. [PMID: 32626592 PMCID: PMC7329490 DOI: 10.1186/s40694-020-00101-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 06/12/2020] [Indexed: 01/01/2023] Open
Abstract
Filamentous fungi are widely used for production of enzymes and chemicals, and are industrially cultivated both in liquid and solid cultures. Submerged culture is often used as liquid culture for filamentous fungi. In submerged culture, filamentous fungi show diverse macromorphology such as hyphal pellets and dispersed hyphae depending on culture conditions and genetic backgrounds of fungal strains. Although the macromorphology greatly affects the productivity of submerged cultures, the specific cellular components needed for hyphal aggregation after conidial germination have not been characterized. Recently we reported that the primary cell wall polysaccharide α-1,3-glucan and the extracellular polysaccharide galactosaminogalactan (GAG) contribute to hyphal aggregation in Aspergillus oryzae, and that a strain deficient in both α-1,3-glucan and GAG shows dispersed hyphae in liquid culture. In this review, we summarize our current understanding of the contribution of chemical properties of α-1,3-glucan and GAG to hyphal aggregation. Various ascomycetes and basidiomycetes have α-1,3-glucan synthase gene(s). In addition, some Pezizomycotina fungi, including species used in the fermentation industry, also have GAG biosynthetic genes. We also review here the known mechanisms of biosynthesis of α-1,3-glucan and GAG. Regulation of the biosynthesis of the two polysaccharides could be a potential way of controlling formation of hyphal pellets.
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Affiliation(s)
- Ken Miyazawa
- Laboratory of Applied Microbiology, Department of Microbial Biotechnology, Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan
| | - Akira Yoshimi
- Laboratory of Environmental Interface Technology of Filamentous Fungi, Graduate School of Agriculture, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502 Japan.,ABE-project, New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aramaki-Aoba, Aoba-ku, Sendai, 980-8579 Japan
| | - Keietsu Abe
- Laboratory of Applied Microbiology, Department of Microbial Biotechnology, Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan.,ABE-project, New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aramaki-Aoba, Aoba-ku, Sendai, 980-8579 Japan.,Laboratory of Microbial Resources, Department of Microbial Biotechnology, Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan
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34
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Li L, Liang T, Liu W, Liu Y, Ma F. A Comprehensive Review of the Mycelial Pellet: Research Status, Applications, and Future Prospects. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01325] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Lixin Li
- School of Environment and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
- State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Taojie Liang
- School of Environment and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
| | - Wanmeng Liu
- School of Environment and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
| | - Yan Liu
- College of Life Science and Technology, Harbin Normal University, Harbin 150020, China
| | - Fang Ma
- State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
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35
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Huey CJ, Gopinath SCB, Uda MNA, Zulhaimi HI, Jaafar MN, Kasim FH, Yaakub ARW. Mycorrhiza: a natural resource assists plant growth under varied soil conditions. 3 Biotech 2020; 10:204. [PMID: 32337150 PMCID: PMC7165205 DOI: 10.1007/s13205-020-02188-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 03/31/2020] [Indexed: 10/24/2022] Open
Abstract
In this overview, the authors have discussed the potential advantages of the association between mycorrhizae and plants, their mutual accelerated growth under favorable conditions and their role in nutrient supply. In addition, methods for isolating mycorrhizae are described and spore morphologies and their adaptation to various conditions are outlined. Further, the significant participation of controlled greenhouses and other supported physiological environments in propagating mycorrhizae is detailed. The reviewed information supports the lack of host- and niche-specificity by arbuscular mycorrhizae, indicating that these fungi are suitable for use in a wide range of ecological conditions and with propagules for direct reintroduction. Regarding their prospective uses, the extensive growth of endomycorrhizal fungi suggests it is suited for poor-quality and low-fertility soils.
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Affiliation(s)
- Chew Jia Huey
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
| | - Subash C. B. Gopinath
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000 Kangar, Perlis Malaysia
| | - M. N. A. Uda
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
| | - Hanna Ilyani Zulhaimi
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
| | - Mahmad Nor Jaafar
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
| | - Farizul Hafiz Kasim
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
- Centre of Excellence for Biomass Utilization, School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
| | - Ahmad Radi Wan Yaakub
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis Malaysia
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36
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Investigation of the mycelial morphology of Monascus and the expression of pigment biosynthetic genes in high-salt-stress fermentation. Appl Microbiol Biotechnol 2020; 104:2469-2479. [DOI: 10.1007/s00253-020-10389-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 12/31/2019] [Accepted: 01/16/2020] [Indexed: 12/19/2022]
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37
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Park BS, Kye HG, Kim TH, Lee JM, Ahrberg CD, Cho EM, Yang SI, Chung BG. Continuous separation of fungal spores in a microfluidic flow focusing device. Analyst 2019; 144:4962-4971. [PMID: 31322144 DOI: 10.1039/c9an00905a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The research of fungi is of great importance in a number of fields, such as environmental and healthcare studies. While there are a large number of optical and molecular methods available for characterization and identification of fungi and their spores, their isolation is still conducted using slow and labor-intensive methods. Here, we develop a microfluidic device for the continuous separation of fungal spores from other eukaryotic cells. The spores were separated through the microfluidic device by expanding pinched flow fractionation (PFF) containing the spores, achieving a spatial separation perpendicular to the flow direction according to the spore size. Further branch flow fractionation (BFF) and co-flow of a Newtonian and viscoelastic fluid were used to enhance the separation performance. Using this microfluidic device, we demonstrated the separation of two different types of fungal spores and further separation of fungal spores from eukaryotic cells with a separation efficiency of above 90%. Compared to the existing conventional methods, our microfluidic flow focusing device requires little manual handling and uses small amounts of samples without any pre-treatment steps of the samples.
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Affiliation(s)
- Byeong Seon Park
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea.
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Mohd Nasir N, Mohd Yunos FH, Wan Jusoh HH, Mohammad A, Lam SS, Jusoh A. Subtopic: Advances in water and wastewater treatment harvesting of Chlorella sp. microalgae using Aspergillus niger as bio-flocculant for aquaculture wastewater treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 249:109373. [PMID: 31415924 DOI: 10.1016/j.jenvman.2019.109373] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 08/02/2019] [Accepted: 08/05/2019] [Indexed: 06/10/2023]
Abstract
Microalgae have been increasingly used to generate biofuel, thus a sustainable technique should be implemented to harvest the biomass to ensure its existence in the environment. Aspergillus niger was used as bio-flocculant to harvest microalgae from aquaculture wastewater via flocculation technique over a range of pH and mixing rate. The bio-flocculant showed ability to adapt at a wide range of pH from 3.0 to 9.0 and at a mixing rate of 100-150 rpm, producing a harvesting efficiency of higher than 90%. The treated water possessed low concentration of chlorophyll-a (0.3-0.6 mg L-1) and cell density (2 × 106-3 × 106 cell mL-1). These indicate that Aspergillus niger is a promising bio-flocculant to be used in harvesting microalgae, thus promoting the use of flocculation as a green technology in aquaculture wastewater treatment.
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Affiliation(s)
- Nurfarahana Mohd Nasir
- School of Ocean Engineering, Universiti Malaysia Terengganu, 21030, Terengganu, Malaysia.
| | | | | | - Aqilah Mohammad
- School of Marine and Environment Science, Universiti Malaysia Terengganu, 21030, Terengganu, Malaysia.
| | - Su Shiung Lam
- Pyrolysis Technology Research Group, Eastern Corridor Renewable Energy Group, School of Ocean Engineering, Universiti Malaysia Terengganu, 21030, Kuala Nerus, Terengganu, Malaysia; Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, 21030, Terengganu, Malaysia.
| | - Ahmad Jusoh
- School of Ocean Engineering, Universiti Malaysia Terengganu, 21030, Terengganu, Malaysia; Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, 21030, Terengganu, Malaysia.
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Schrader M, Pommerehne K, Wolf S, Finke B, Schilde C, Kampen I, Lichtenegger T, Krull R, Kwade A. Design of a CFD-DEM-based method for mechanical stress calculation and its application to glass bead-enhanced cultivations of filamentous Lentzea aerocolonigenes. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.04.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Wei X, Liu C, An F, Lu Y. Induced effect of Ca2+ on curvulamine synthesis by marine-derived fungus Curvularia sp. IFB-Z10 under submerged fermentation. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.03.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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41
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The influence of salt-enhanced cultivation on the micromechanical behaviour of filamentous pellets. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.04.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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42
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Pham JV, Yilma MA, Feliz A, Majid MT, Maffetone N, Walker JR, Kim E, Cho HJ, Reynolds JM, Song MC, Park SR, Yoon YJ. A Review of the Microbial Production of Bioactive Natural Products and Biologics. Front Microbiol 2019; 10:1404. [PMID: 31281299 PMCID: PMC6596283 DOI: 10.3389/fmicb.2019.01404] [Citation(s) in RCA: 230] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 06/04/2019] [Indexed: 12/24/2022] Open
Abstract
A variety of organisms, such as bacteria, fungi, and plants, produce secondary metabolites, also known as natural products. Natural products have been a prolific source and an inspiration for numerous medical agents with widely divergent chemical structures and biological activities, including antimicrobial, immunosuppressive, anticancer, and anti-inflammatory activities, many of which have been developed as treatments and have potential therapeutic applications for human diseases. Aside from natural products, the recent development of recombinant DNA technology has sparked the development of a wide array of biopharmaceutical products, such as recombinant proteins, offering significant advances in treating a broad spectrum of medical illnesses and conditions. Herein, we will introduce the structures and diverse biological activities of natural products and recombinant proteins that have been exploited as valuable molecules in medicine, agriculture and insect control. In addition, we will explore past and ongoing efforts along with achievements in the development of robust and promising microorganisms as cell factories to produce biologically active molecules. Furthermore, we will review multi-disciplinary and comprehensive engineering approaches directed at improving yields of microbial production of natural products and proteins and generating novel molecules. Throughout this article, we will suggest ways in which microbial-derived biologically active molecular entities and their analogs could continue to inspire the development of new therapeutic agents in academia and industry.
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Affiliation(s)
- Janette V. Pham
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
| | - Mariamawit A. Yilma
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
| | - Adriana Feliz
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
| | - Murtadha T. Majid
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
| | - Nicholas Maffetone
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
| | - Jorge R. Walker
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
| | - Eunji Kim
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, South Korea
| | - Hyo Je Cho
- School of Life Sciences and Biotechnology, Kyungpook National University, Daegu, South Korea
| | - Jared M. Reynolds
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
| | - Myoung Chong Song
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, South Korea
| | - Sung Ryeol Park
- Geisinger Commonwealth School of Medicine, Scranton, PA, United States
- Baruch S. Blumberg Institute, Doylestown, PA, United States
- Natural Products Discovery Institute, Doylestown, PA, United States
| | - Yeo Joon Yoon
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, South Korea
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43
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Li S, Huang J, Mao J, Zhang L, He C, Chen G, Parkin IP, Lai Y. In vivo and in vitro efficient textile wastewater remediation by Aspergillus niger biosorbent. NANOSCALE ADVANCES 2019; 1:168-176. [PMID: 36132482 PMCID: PMC9473216 DOI: 10.1039/c8na00132d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Accepted: 11/22/2018] [Indexed: 05/16/2023]
Abstract
In this work, the treatment of textile wastewater by a facile and high-efficiency technology using eco-friendly Aspergillus niger as a biosorbent was investigated. We measured physical changes (weight, size) during the formation and growth of fungus pellets and the pH values that influence the adsorption performance and biosorption mechanism. Three acid anionic dyes containing Acid Orange 56, Acid Blue 40 and Methyl Blue were chosen as model dyes to investigate batch adsorption efficiency. Two adsorption models (in vivo and in vitro) were adopted to decolorize the acid dyes. The results show that fungus pellets have excellent decoloration abilities with a high adsorption efficiency of 98% for 200 mg L-1 of acid dye. The pH value of the dye solution varied with the adsorption time and the dye removal efficiency greatly depended on the pH. The bioadsorption mechanism of nano-scale hyphae was revealed to be mainly due to electrostatic interactions caused by the pH change. Furthermore, the surface morphologies of the fungus after adsorption indicated that the dyes had been adsorbed on the surface of the fungus mycelia. Moreover, prepared 3D fungus/GO aerogels demonstrated superior dye removal abilities compared with fungus aerogels.
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Affiliation(s)
- Shuhui Li
- College of Chemical Engineering, Fuzhou University Fuzhou 350116 China
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University Suzhou 215123 China
| | - Jianying Huang
- College of Chemical Engineering, Fuzhou University Fuzhou 350116 China
| | - Jiajun Mao
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University Suzhou 215123 China
| | - Liyuan Zhang
- Department of Civil Engineering, The University of Hong Kong Hong Kong China
| | - Chenglin He
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University Suzhou 215123 China
| | - Guoqiang Chen
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University Suzhou 215123 China
| | - Ivan P Parkin
- Department of Chemistry, University College London London WC1H 0AJ UK
| | - Yuekun Lai
- College of Chemical Engineering, Fuzhou University Fuzhou 350116 China
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University Suzhou 215123 China
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44
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Chelius CL, Ribeiro LFC, Huso W, Kumar J, Lincoln S, Tran B, Goo YA, Srivastava R, Harris SD, Marten MR. Phosphoproteomic and transcriptomic analyses reveal multiple functions for Aspergillus nidulans MpkA independent of cell wall stress. Fungal Genet Biol 2019; 125:1-12. [PMID: 30639305 DOI: 10.1016/j.fgb.2019.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 12/18/2018] [Accepted: 01/04/2019] [Indexed: 12/17/2022]
Abstract
The protein kinase MpkA plays a prominent role in the cell wall integrity signaling (CWIS) pathway, acting as the terminal MAPK activating expression of genes which encode cell wall biosynthetic enzymes and other repair functions. Numerous studies focus on MpkA function during cell wall perturbation. Here, we focus on the role MpkA plays outside of cell wall stress, during steady state growth. In an effort to seek other, as yet unknown, connections to this pathway, an mpkA deletion mutant (ΔmpkA) was subjected to phosphoproteomic and transcriptomic analysis. When compared to the control (isogenic parent of ΔmpkA), there is strong evidence suggesting MpkA is involved with maintaining cell wall strength, branching regulation, and the iron starvation pathway, among others. Particle-size analysis during shake flask growth revealed ΔmpkA mycelia were about 4 times smaller than the control strain and more than 90 cell wall related genes show significantly altered expression levels. The deletion mutant had a significantly higher branching rate than the control and phosphoproteomic results show putative branching-regulation proteins, such as CotA, LagA, and Cdc24, have a significantly different level of phosphorylation. When grown in iron limited conditions, ΔmpkA had no difference in growth rate or production of siderophores, whereas the control strain showed decreased growth rate and increased siderophore production. Transcriptomic data revealed over 25 iron related genes with altered transcript levels. Results suggest MpkA is involved with regulation of broad cellular functions in the absence of stress.
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Affiliation(s)
- Cynthia L Chelius
- Department of Chemical, Biochemical, and Environmental Engineering, University of Maryland Baltimore County, Baltimore, MD 21250, United States
| | - Liliane F C Ribeiro
- Department of Chemical, Biochemical, and Environmental Engineering, University of Maryland Baltimore County, Baltimore, MD 21250, United States
| | - Walker Huso
- Department of Chemical, Biochemical, and Environmental Engineering, University of Maryland Baltimore County, Baltimore, MD 21250, United States
| | - Jyothi Kumar
- Center for Plant Science Innovation and Department of Plant Pathology, University of Nebraska-Lincoln, Lincoln, NE 68588, United States
| | - Stephen Lincoln
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, United States
| | - Bao Tran
- Mass Spectrometry Center, University of Maryland School of Pharmacy, Baltimore, MD, 21201, United States
| | - Young Ah Goo
- Mass Spectrometry Center, University of Maryland School of Pharmacy, Baltimore, MD, 21201, United States
| | - Ranjan Srivastava
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, United States
| | - Steven D Harris
- Center for Plant Science Innovation and Department of Plant Pathology, University of Nebraska-Lincoln, Lincoln, NE 68588, United States
| | - Mark R Marten
- Department of Chemical, Biochemical, and Environmental Engineering, University of Maryland Baltimore County, Baltimore, MD 21250, United States.
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45
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Rühl M, Lange K, Kües U. Laccase production and pellet morphology of Coprinopsis cinerea transformants in liquid shake flask cultures. Appl Microbiol Biotechnol 2018; 102:7849-7863. [PMID: 30032435 DOI: 10.1007/s00253-018-9227-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 07/05/2018] [Indexed: 10/28/2022]
Abstract
Laccase production and pellet formation of transformants of Coprinopsis cinerea strain FA2222 of C. cinerea laccase gene lcc1 subcloned behind the gpdII-promoter from Agaricus bisporus were compared with a control transformant carrying no extra laccase gene. At the optimum growth temperature of 37 °C, maximal laccase yields of 2.9 U/ml were obtained by the best lcc1 transformant pYSK7-26 in liquid shake flask cultures. Reduction in temperature to 25 °C increased laccase yields up to 9.2 U/ml. The control transformant had no laccase activities at 37 °C but native activity at 25 °C (3.5 U/ml). Changing the temperature had severe effects on the morphology of the mycelial pellets formed during cultivation, but links of distinct pellet morphologies to native or recombinant laccase production could not be established. Automated image analysis was used to characterise pellet formation and morphological parameters (pellet area, diameter, convexity and mycelial structure). Cross sections of selected pellets showed that they differentiated in an outer rind and an inner medulla of loosened hyphae. Pellets at 25 °C had a small and dense outer zone and adopted with time a smooth surface. Pellets at 37 °C had a broader outer zone and a fringy surface due to generation of more and larger protuberances in the rind that when released can serve for production of further pellets.
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Affiliation(s)
- Martin Rühl
- Molecular Wood Biotechnology and Technical Mycology, Büsgen-Institute and Goettingen Center for Molecular Biosciences (GZMB), University of Goettingen, Büsgenweg 2, 37077, Goettingen, Germany.,Institute of Food Chemistry and Food Biotechnology, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 17, 35392, Giessen, Germany
| | - Karin Lange
- Molecular Wood Biotechnology and Technical Mycology, Büsgen-Institute and Goettingen Center for Molecular Biosciences (GZMB), University of Goettingen, Büsgenweg 2, 37077, Goettingen, Germany
| | - Ursula Kües
- Molecular Wood Biotechnology and Technical Mycology, Büsgen-Institute and Goettingen Center for Molecular Biosciences (GZMB), University of Goettingen, Büsgenweg 2, 37077, Goettingen, Germany.
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46
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Sardella D, Gatt R, Valdramidis VP. Turbidimetric Assessment of the Growth of Filamentous Fungi and the Antifungal Activity of Zinc Oxide Nanoparticles. J Food Prot 2018; 81:934-941. [PMID: 29745759 DOI: 10.4315/0362-028x.jfp-17-448] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Rapid assessment of fungal growth and screening antifungal compounds, such as nanoparticles (NPs), for effectiveness is a challenging procedure because no primary standards exist as they do for yeasts and bacteria. Because fungi do not grow as single cells, but as hyphal filaments, they cannot be quantified by the usual enumeration techniques used in bacteriology. The growth of three postharvest fungal isolates ( Alternaria alternata, Rhizopus stolonifer, and Botrytis cinerea) was investigated at different inoculum concentrations and in three nutrient media (Sabouraud dextrose agar, potato dextrose agar, and yeast extract dextrose agar [YED]) with a turbidimetric assay. Sequential measurements were performed to generate optical density versus time plots, whereas the growth responses were expressed quantitatively as the generated trapezoidal area. YED medium showed the lowest variation among replicated experiments; potato dextrose agar showed the next lowest, but there was no significant difference. The inoculum size had a minimal effect on the variation of the fungal dynamics. Microscopic assessment of the fungal growth confirmed that YED medium allowed the most homogeneous development of the studied fungi. Therefore, we developed a rapid and reliable technique to evaluate the efficacy of novel antifungal compounds such as zinc oxide NPs. Turbidimetric assessment showed that these NPs were able to inhibit the growth of all three isolates. A. alternata and B. cinerea did not show a significant difference in the level of inhibition at 15 mM, whereas R. stolonifer showed the highest inhibition at the same concentration.
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Affiliation(s)
- Davide Sardella
- 1 Department of Food Sciences and Nutrition, Faculty of Health Science, University of Malta, Triq Dun Karm, L-Imsida, MSD 2080, Malta.,2 Centre for Molecular Medicine and Biobanking, University of Malta, Triq Dun Karm, L-Imsida, MSD 2080, Malta
| | - Ruben Gatt
- 3 Metamaterials Unit, Faculty of Science, University of Malta, Triq Dun Karm, L-Imsida, MSD 2080, Malta
| | - Vasilis P Valdramidis
- 1 Department of Food Sciences and Nutrition, Faculty of Health Science, University of Malta, Triq Dun Karm, L-Imsida, MSD 2080, Malta.,2 Centre for Molecular Medicine and Biobanking, University of Malta, Triq Dun Karm, L-Imsida, MSD 2080, Malta
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47
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Fiedler MRM, Cairns TC, Koch O, Kubisch C, Meyer V. Conditional Expression of the Small GTPase ArfA Impacts Secretion, Morphology, Growth, and Actin Ring Position in Aspergillus niger. Front Microbiol 2018; 9:878. [PMID: 29867795 PMCID: PMC5952172 DOI: 10.3389/fmicb.2018.00878] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 04/16/2018] [Indexed: 12/26/2022] Open
Abstract
In filamentous fungi, growth and protein secretion occurs predominantly at the tip of long, thread like cells termed hyphae. This requires coordinated regulation of multiple processes, including vesicle trafficking, exocytosis, and endocytosis, which are facilitated by a complex cytoskeletal apparatus. In this study, functional analyses of the small GTPase ArfA from Aspergillus niger demonstrate that this protein functionally complements the Saccharomyces cerevisiae ARF1/2, and that this protein is essential for A. niger. Loss-of-function and gain-of-function analyses demonstrate that titration of arfA expression impacts hyphal growth rate, hyphal tip morphology, and protein secretion. Moreover, localization of the endocytic machinery, visualized via fluorescent tagging of the actin ring, was found to be abnormal in ArfA under- and overexpressed conditions. Finally, we provide evidence that the major secreted protein GlaA localizes at septal junctions, indicating that secretion in A. niger may occur at these loci, and that this process is likely impacted by arfA expression levels. Taken together, our results demonstrate that ArfA fulfills multiple functions in the secretory pathway of A. niger.
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Affiliation(s)
- Markus R M Fiedler
- Department of Applied and Molecular Microbiology, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Timothy C Cairns
- Department of Applied and Molecular Microbiology, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Oliver Koch
- Department of Applied and Molecular Microbiology, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Christin Kubisch
- Department of Applied and Molecular Microbiology, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Vera Meyer
- Department of Applied and Molecular Microbiology, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
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48
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Chan LG, Cohen JL, de Moura Bell JMLN. Conversion of Agricultural Streams and Food-Processing By-Products to Value-Added Compounds Using Filamentous Fungi. Annu Rev Food Sci Technol 2018; 9:503-523. [DOI: 10.1146/annurev-food-030117-012626] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lauryn G. Chan
- Department of Food Science and Technology, University of California, Davis, California 95616, USA
| | - Joshua L. Cohen
- Department of Food Science and Technology, University of California, Davis, California 95616, USA
| | - Juliana Maria Leite Nobrega de Moura Bell
- Department of Food Science and Technology, University of California, Davis, California 95616, USA
- Department of Biological and Agricultural Engineering, University of California, Davis, California 95616, USA
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49
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Veiter L, Rajamanickam V, Herwig C. The filamentous fungal pellet-relationship between morphology and productivity. Appl Microbiol Biotechnol 2018; 102:2997-3006. [PMID: 29473099 PMCID: PMC5852183 DOI: 10.1007/s00253-018-8818-7] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 01/29/2018] [Accepted: 01/29/2018] [Indexed: 11/28/2022]
Abstract
Filamentous fungi are used for the production of a multitude of highly relevant biotechnological products like citric acid and penicillin. In submerged culture, fungi can either grow in dispersed form or as spherical pellets consisting of aggregated hyphal structures. Pellet morphology, process control and productivity are highly interlinked. On the one hand, process control in a bioreactor usually demands for compact and small pellets due to rheological issues. On the other hand, optimal productivity might be associated with less dense and larger morphology. Over the years, several publications have dealt with aforementioned relations within the confines of specific organisms and products. However, contributions which evaluate such interlinkages across several fungal species are scarce. For this purpose, we are looking into methods to manipulate fungal pellet morphology in relation to individual species and products. This review attempts to address (i) how variability of pellet morphology can be assessed and (ii) how morphology is linked to productivity. Firstly, the mechanism of pellet formation is outlined. Subsequently, the description and analysis of morphological variations are discussed to finally establish interlinkages between productivity, performance and morphology across different fungal species.
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Affiliation(s)
- Lukas Veiter
- Research Area Biochemical Engineering, Institute of Chemical Engineering, TU Wien, Gumpendorfer Straße 1a, 1060, Vienna, Austria.,Christian Doppler Laboratory for Mechanistic and Physiological Methods for Improved Bioprocesses, TU Wien, Gumpendorfer Straße 1a, 1060, Vienna, Austria
| | - Vignesh Rajamanickam
- Research Area Biochemical Engineering, Institute of Chemical Engineering, TU Wien, Gumpendorfer Straße 1a, 1060, Vienna, Austria.,Christian Doppler Laboratory for Mechanistic and Physiological Methods for Improved Bioprocesses, TU Wien, Gumpendorfer Straße 1a, 1060, Vienna, Austria
| | - Christoph Herwig
- Research Area Biochemical Engineering, Institute of Chemical Engineering, TU Wien, Gumpendorfer Straße 1a, 1060, Vienna, Austria. .,Christian Doppler Laboratory for Mechanistic and Physiological Methods for Improved Bioprocesses, TU Wien, Gumpendorfer Straße 1a, 1060, Vienna, Austria.
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50
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Laccase production in bioreactor scale under saline condition by the marine-derived basidiomycete Peniophora sp. CBMAI 1063. Fungal Biol 2018; 122:302-309. [PMID: 29665956 DOI: 10.1016/j.funbio.2018.01.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 01/25/2018] [Accepted: 01/31/2018] [Indexed: 11/21/2022]
Abstract
Laccase production in saline conditions is still poorly studied. The aim of the present study was to investigate the production of laccase in two different types of bioreactors by the marine-derived basidiomycete Peniophora sp. CBMAI 1063. The highest laccase activity and productivity were obtained in the Stirred Tank (ST) bioreactor, while the highest biomass concentration in Air-lift (AL) bioreactor. The main laccase produced was purified by ion exchange and size exclusion chromatography and appeared to be monomeric with molecular weight of approximately 55 kDa. The optimum oxidation activity was obtained at pH 5.0. The thermal stability of the enzyme ranged from 30 to 50 °C (120 min). The Far-UV Circular Dichroism revealed the presence of high β-sheet and low α-helical conformation in the protein structure. Additional experiments carried out in flask scale showed that the marine-derived fungus was able to produce laccase only in the presence of artificial seawater and copper sulfate. Results from the present study confirmed the fungal adaptation to marine conditions and its potential for being used in saline environments and/or processes.
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