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Kikukawa H, Ando A, Hannya A, Farida Asras MF, Okuda T, Sakamoto T, Hara KY, Sakuradani E, Ogawa J. Mead acid production by disruption of Δ12-desaturase gene in Mortierella alpina 1S-4. J Biosci Bioeng 2023; 136:353-357. [PMID: 37635046 DOI: 10.1016/j.jbiosc.2023.08.001] [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: 01/31/2023] [Revised: 07/19/2023] [Accepted: 08/03/2023] [Indexed: 08/29/2023]
Abstract
Mead acid (MA; 20:3ω9) is one of the ω9 series of polyunsaturated fatty acids (PUFAs). MA is used to inhibit the inflammation of joints and is applied to the medicinal or health food field. We aimed to construct MA-producing strains with disruption of the Δ12-desaturase gene (Δ12ds) via an efficient gene-targeting system using the lig4-disrupted strain of Mortierella alpina 1S-4 as the host. The transformants showed a unique fatty acid composition that only comprised ω9-PUFAs and saturated fatty acids, while ω6-and ω3-PUFAs were not detected, and the total composition of ω9-PUFAs, including oleic acid (18:1ω9), 18:2ω9, 20:1ω9, 20:2ω9, and MA, was up to 68.4% of the total fatty acids. The MA production in the Δ12ds-disruptant reached 0.10 g/L (8.5%), which exceeded 0.050 g/L (4.6%) in the conventional Δ12ds-defective mutant JT-180.
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Affiliation(s)
- Hiroshi Kikukawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan; Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Akinori Ando
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan; Research Unit for Physiological Chemistry, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Asuka Hannya
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Mohd Fazli Farida Asras
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Tomoyo Okuda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takaiku Sakamoto
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Kiyotaka Y Hara
- Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Eiji Sakuradani
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Jun Ogawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan; Research Unit for Physiological Chemistry, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
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Acs-Szabo L, Papp LA, Takacs S, Miklos I. Disruption of the Schizosaccharomyces japonicus lig4 Disturbs Several Cellular Processes and Leads to a Pleiotropic Phenotype. J Fungi (Basel) 2023; 9:jof9050550. [PMID: 37233261 DOI: 10.3390/jof9050550] [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: 01/18/2023] [Revised: 04/15/2023] [Accepted: 05/05/2023] [Indexed: 05/27/2023] Open
Abstract
Gene targeting is a commonly used method to reveal the function of genes. Although it is an attractive tool for molecular studies, it can frequently be a challenge because its efficiency can be low and it requires the screening of a large number of transformants. Generally, these problems originate from the elevated level of ectopic integration caused by non-homologous DNA end joining (NHEJ). To eliminate this problem, NHEJ-related genes are frequently deleted or disrupted. Although these manipulations can improve gene targeting, the phenotype of the mutant strains raised the question of whether mutations have side effects. The aim of this study was to disrupt the lig4 gene in the dimorphic fission yeast, S. japonicus, and investigate the phenotypic changes of the mutant strain. The mutant cells have shown various phenotypic changes, such as increased sporulation on complete medium, decreased hyphal growth, faster chronological aging, and higher sensitivity to heat shock, UV light, and caffeine. In addition, higher flocculation capacity has been observed, especially at lower sugar concentrations. These changes were supported by transcriptional profiling. Many genes belonging to metabolic and transport processes, cell division, or signaling had altered mRNA levels compared to the control strain. Although the disruption improved the gene targeting, we assume that the lig4 inactivation can cause unexpected physiological side effects, and we have to be very careful with the manipulations of the NHEJ-related genes. To reveal the exact mechanisms behind these changes, further investigations are required.
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Affiliation(s)
- Lajos Acs-Szabo
- Department of Genetics and Applied Microbiology, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary
| | - Laszlo Attila Papp
- Department of Genetics and Applied Microbiology, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary
| | - Szonja Takacs
- Department of Genetics and Applied Microbiology, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary
| | - Ida Miklos
- Department of Genetics and Applied Microbiology, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary
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Wurlitzer JM, Stanišić A, Ziethe S, Jordan PM, Günther K, Werz O, Kries H, Gressler M. Macrophage-targeting oligopeptides from Mortierella alpina. Chem Sci 2022; 13:9091-9101. [PMID: 36091214 PMCID: PMC9365243 DOI: 10.1039/d2sc00860b] [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: 02/10/2022] [Accepted: 07/15/2022] [Indexed: 12/27/2022] Open
Abstract
The realm of natural products of early diverging fungi such as Mortierella species is largely unexplored. Herein, the nonribosomal peptide synthetase (NRPS) MalA catalysing the biosynthesis of the surface-active biosurfactants, malpinins, has been identified and biochemically characterised. The investigation of the substrate specificity of respective adenylation (A) domains indicated a substrate-tolerant enzyme with an unusual, inactive C-terminal NRPS module. Specificity-based precursor-directed biosynthesis yielded 20 new congeners produced by a single enzyme. Moreover, MalA incorporates artificial, click-functionalised amino acids which allowed postbiosynthetic coupling to a fluorophore. The fluorescent malpinin conjugate penetrates mammalian cell membranes via an phagocytosis-mediated mechanism, suggesting Mortierella oligopeptides as carrier peptides for directed cell targeting. The current study demonstrates substrate-specificity testing as a powerful tool to identify flexible NRPS modules and highlights basal fungi as reservoir for chemically tractable compounds in pharmaceutical applications. Specificity profiling of a nonribosomal peptide synthetase of an early diverging fungus revealed high substrate flexibility. Feeding studies with click-functionalised amino acids enabled the production of fluorescent peptides targeting macrophages.![]()
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Affiliation(s)
- Jacob M. Wurlitzer
- Department Pharmaceutical Microbiology at the Leibniz Institute for Natural Product Research and Infection Biology (Hans-Knöll-Institute), Friedrich-Schiller-University, Winzerlaer Strasse 2, Jena 07745, Germany
| | - Aleksa Stanišić
- Junior Group Biosynthetic Design of Natural Products at the Leibniz Institute for Natural Product Research and Infection Biology (Hans-Knöll-Institute), Beutenbergstrasse 11a, Jena 07745, Germany
| | - Sebastian Ziethe
- Department Pharmaceutical Microbiology at the Leibniz Institute for Natural Product Research and Infection Biology (Hans-Knöll-Institute), Friedrich-Schiller-University, Winzerlaer Strasse 2, Jena 07745, Germany
| | - Paul M. Jordan
- Department Pharmaceutical/Medicinal Chemistry at the Friedrich-Schiller-University, Philosophenweg 14, Jena 07743, Germany
| | - Kerstin Günther
- Department Pharmaceutical/Medicinal Chemistry at the Friedrich-Schiller-University, Philosophenweg 14, Jena 07743, Germany
| | - Oliver Werz
- Department Pharmaceutical/Medicinal Chemistry at the Friedrich-Schiller-University, Philosophenweg 14, Jena 07743, Germany
| | - Hajo Kries
- Junior Group Biosynthetic Design of Natural Products at the Leibniz Institute for Natural Product Research and Infection Biology (Hans-Knöll-Institute), Beutenbergstrasse 11a, Jena 07745, Germany
| | - Markus Gressler
- Department Pharmaceutical Microbiology at the Leibniz Institute for Natural Product Research and Infection Biology (Hans-Knöll-Institute), Friedrich-Schiller-University, Winzerlaer Strasse 2, Jena 07745, Germany
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Bacterial-Like Nonribosomal Peptide Synthetases Produce Cyclopeptides in the Zygomycetous Fungus Mortierella alpina. Appl Environ Microbiol 2021; 87:AEM.02051-20. [PMID: 33158886 DOI: 10.1128/aem.02051-20] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 10/30/2020] [Indexed: 12/20/2022] Open
Abstract
Fungi are traditionally considered a reservoir of biologically active natural products. However, an active secondary metabolism has long not been attributed to early-diverging fungi such as Mortierella Here, we report on the biosynthesis of two series of cyclic pentapeptides, the malpicyclins and malpibaldins, as products of Mortierella alpina ATCC 32222. The molecular structures of malpicyclins were elucidated by high-resolution tandem mass spectrometry (HR-MS/MS), Marfey's method, and one-dimensional (1D) and 2D nuclear magnetic resonance (NMR) spectroscopy. In addition, malpibaldin biosynthesis was confirmed by HR-MS. Genome mining and comparative quantitative real-time PCR (qRT-PCR) expression analysis pointed at two pentamodular nonribosomal peptide synthetases (NRPSs), malpicyclin synthetase MpcA and malpibaldin synthetase MpbA, as candidate biosynthetic enzymes. Heterologous production of the respective adenylation domains and substrate specificity assays proved promiscuous substrate selection and confirmed their respective biosynthetic roles. In stark contrast to known fungal NRPSs, MpbA and MpcA contain bacterial-like dual epimerase/condensation domains allowing the racemization of enzyme-tethered l-amino acids and the subsequent incorporation of d-amino acids into the metabolites. Phylogenetic analyses of both NRPS genes indicated a bacterial origin and a horizontal gene transfer into the fungal genome. We report on the as-yet-unexplored nonribosomal peptide biosynthesis in basal fungi which highlights this paraphylum as a novel and underrated resource of natural products.IMPORTANCE Fungal natural compounds are industrially produced, with application in antibiotic treatment, cancer medications, and crop plant protection. Traditionally, higher fungi have been intensively investigated concerning their metabolic potential, but reidentification of already known compounds is frequently observed. Hence, alternative strategies to acquire novel bioactive molecules are required. We present the genus Mortierella as representative of the early-diverging fungi as an underestimated resource of natural products. Mortierella alpina produces two families of cyclopeptides, designated malpicyclins and malpibaldins, respectively, via two pentamodular nonribosomal peptide synthetases (NRPSs). These enzymes are much more closely related to bacterial than to other fungal NRPSs, suggesting a bacterial origin of these NRPS genes in Mortierella Both enzymes were biochemically characterized and are involved in as-yet-unknown biosynthetic pathways of natural products in basal fungi. Hence, this report establishes early-diverging fungi as prolific natural compound producers and sheds light on the origin of their biosynthetic capacity.
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Zhang H, Cui Q, Song X. Research advances on arachidonic acid production by fermentation and genetic modification of Mortierella alpina. World J Microbiol Biotechnol 2021; 37:4. [DOI: 10.1007/s11274-020-02984-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 12/20/2020] [Indexed: 12/12/2022]
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Ding Y, Wang KF, Wang WJ, Ma YR, Shi TQ, Huang H, Ji XJ. Increasing the homologous recombination efficiency of eukaryotic microorganisms for enhanced genome engineering. Appl Microbiol Biotechnol 2019; 103:4313-4324. [DOI: 10.1007/s00253-019-09802-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 03/26/2019] [Accepted: 03/27/2019] [Indexed: 11/28/2022]
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Zhang H, Lu D, Li X, Feng Y, Cui Q, Song X. Heavy ion mutagenesis combined with triclosan screening provides a new strategy for improving the arachidonic acid yield in Mortierella alpina. BMC Biotechnol 2018; 18:23. [PMID: 29716562 PMCID: PMC5930740 DOI: 10.1186/s12896-018-0437-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 04/18/2018] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Arachidonic acid (ARA), which is a ω-6 polyunsaturated fatty acid, has a wide range of biological activities and is an essential component of cellular membranes in some human tissues. Mortierella alpina is the best strain for industrial production of ARA. To increase its yield of arachidonic acid, heavy ion beam irradiation mutagenesis of Mortierella alpina was carried out in combination with triclosan and octyl gallate treatment. RESULTS The obtained mutant strain F-23 ultimately achieved an ARA yield of 5.26 g L- 1, which is 3.24 times higher than that of the wild-type strain. In addition, quantitative real-time PCR confirmed that the expression levels of fatty acid synthase (FAS), Δ5-desaturase, Δ6-desaturase, and Δ9-desaturase were all significantly up-regulated in the mutant F-23 strain, especially Δ6- and Δ9-desaturase, which were up-regulated 3- and 2-fold, respectively. CONCLUSIONS This study confirmed a feasible mutagenesis breeding strategy for improving ARA production and provided a mutant of Mortierella alpina with high ARA yield.
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Affiliation(s)
- Huidan Zhang
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, Shandong, China.,Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, 266101, Shandong, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Dong Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
| | - Xin Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
| | - Yingang Feng
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, Shandong, China.,Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, 266101, Shandong, China
| | - Qiu Cui
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, Shandong, China.,Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, Shandong, China.,Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, 266101, Shandong, China
| | - Xiaojin Song
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, Shandong, China. .,Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, 266101, Shandong, China.
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Kikukawa H, Sakuradani E, Ando A, Shimizu S, Ogawa J. Arachidonic acid production by the oleaginous fungus Mortierella alpina 1S-4: A review. J Adv Res 2018; 11:15-22. [PMID: 30034872 PMCID: PMC6052653 DOI: 10.1016/j.jare.2018.02.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 02/04/2018] [Accepted: 02/06/2018] [Indexed: 11/29/2022] Open
Abstract
The filamentous fungus Mortierella alpina 1S-4 is capable of accumulating a large amount of triacylglycerol containing C20 polyunsaturated fatty acids (PUFAs). Indeed, triacylglycerol production by M. alpina 1S-4 can reach 20 g/L of culture broth, and the critical cellular signaling and structural PUFA arachidonic acid (ARA) comprises 30%–70% of the total fatty acid. The demonstrated health benefits of functional PUFAs have in turn encouraged the search for rich sources of these compounds, including fungal strains showing enhanced production of specific PUFAs. Screening for mutants and targeted gene manipulation of M. alpina 1S-4 have elucidated the functions of various enzymes involved in PUFA biosynthesis and established lines with improved PUFA productivity. In some cases, these strains have been used for indistrial-scale production of PUFAs, including ARA. In this review, we described practical ARA production through mutant breeding, functional analyses of genes encoding enzymes involved in PUFA biosynthesis, and recent advances in the production of specific PUFAs through molecular breeding of M. alpina 1S-4.
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Affiliation(s)
- Hiroshi Kikukawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Eiji Sakuradani
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
- Institute of Technology and Science, The University of Tokushima, 2-1 Minami-josanjima, Tokushima 770-8506, Japan
| | - Akinori Ando
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Sakayu Shimizu
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
- Department of Bioscience and Biotechnology, Faculty of Bioenvironmental Science, Kyoto Gakuen University, 1-1 Nanjo, Sogabe, Kameoka 621-8555, Japan
| | - Jun Ogawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
- Corresponding author.
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Zhang H, Feng Y, Cui Q, Song X. Expression of Vitreoscilla hemoglobin enhances production of arachidonic acid and lipids in Mortierella alpina. BMC Biotechnol 2017; 17:68. [PMID: 28854910 PMCID: PMC5577678 DOI: 10.1186/s12896-017-0388-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/08/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Arachidonic acid (ARA, C20:4, n-6), which belongs to the omega-6 series of polyunsaturated fatty acids and has a variety of biological activities, is commercially produced in Mortierella alpina. Dissolved oxygen or oxygen utilization efficiency is a critical factor for Mortierella alpina growth and arachidonic acid production in large-scale fermentation. Overexpression of the Vitreoscilla hemoglobin gene is thought to significantly increase the oxygen utilization efficiency of the cells. RESULTS An optimized Vitreoscilla hemoglobin (VHb) gene was introduced into Mortierella alpina via Agrobacterium tumefaciens-mediated transformation. Compared with the parent strain, the VHb-expressing strain, termed VHb-20, grew faster under both limiting and non-limiting oxygen conditions and exhibited dramatic changes in cell morphology. Furthermore, VHb-20 produced 4- and 8-fold higher total lipid and ARA yields than those of the wild-type strain under a microaerobic environment. Furthermore, ARA production of VHb-20 was also 1.6-fold higher than that of the wild type under normal conditions. The results demonstrated that DO utilization was significantly increased by expressing the VHb gene in Mortierella alpina. CONCLUSIONS The expression of VHb enhances ARA and lipid production under both lower and normal dissolved oxygen conditions. This study provides a novel strategy and an engineered strain for the cost-efficient production of ARA.
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Affiliation(s)
- Huidan Zhang
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No.189 Songling Road, Laoshan District, Qingdao, Shandong Province 266101 China
- Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, Shandong 266101 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Yingang Feng
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No.189 Songling Road, Laoshan District, Qingdao, Shandong Province 266101 China
- Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, Shandong 266101 China
| | - Qiu Cui
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No.189 Songling Road, Laoshan District, Qingdao, Shandong Province 266101 China
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101 China
- Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, Shandong 266101 China
| | - Xiaojin Song
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No.189 Songling Road, Laoshan District, Qingdao, Shandong Province 266101 China
- Qingdao Engineering Laboratory of Single Cell Oil, Qingdao, Shandong 266101 China
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Qin X, Li R, Luo X, Lin Y, Feng JX. Deletion of ligD significantly improves gene targeting frequency in the lignocellulolytic filamentous fungus Penicillium oxalicum. Fungal Biol 2017; 121:615-623. [PMID: 28606356 DOI: 10.1016/j.funbio.2017.04.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 03/29/2017] [Accepted: 04/17/2017] [Indexed: 01/05/2023]
Abstract
To improve the gene targeting frequency (GTF) in the lignocellulolytic filamentous fungus Penicillium oxalicum HP7-1, the non-homologous end-joining (NHEJ) gene ligD was deleted. The obtained PoligD deletion mutant ΔPoligD showed no apparent defect in cellulase production, growth rate, and sensitivity towards osmotic stress and mutagen ethyl methanesulphonate (EMS), while increased sensitivity to high concentrations of methyl methanesulfonate (MMS). Deletion of PoligD gene resulted in significantly increased GTFs at three different loci in P. oxalicum, which are even higher than those in Poku70 deletion mutant. The GTF in ΔPoligD at PoargB (reached 97 %) and PoagaA (reached 90 %) loci increased 5.1- and 1.2-fold compared with that in wild-type strain (WT), while at the Podpp4 locus GTF was up to 27 % in ΔPoligD but close to 0 % in WT, with 0.5 kb homologous flanking regions. Furthermore, the argB and agaA nutritional selection in P. oxalicum was demonstrated and the PoargB and PoagaA genes could be used as selective markers in this fungus. Thus, the PoligD deletion mutant can be an important tool for the functional analysis of genes in P. oxalicum.
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Affiliation(s)
- Xiulin Qin
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, PR China.
| | - Ruijie Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, PR China.
| | - Xiang Luo
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, PR China.
| | - Yanmei Lin
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, PR China.
| | - Jia-Xun Feng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, PR China.
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Kikukawa H, Sakuradani E, Ando A, Okuda T, Shimizu S, Ogawa J. Microbial production of dihomo-γ-linolenic acid by Δ5-desaturase gene-disruptants of Mortierella alpina 1S-4. J Biosci Bioeng 2016; 122:22-6. [DOI: 10.1016/j.jbiosc.2015.12.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 11/10/2015] [Accepted: 12/09/2015] [Indexed: 11/27/2022]
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