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Fukuda S, Kono Y, Ishibashi Y, Tabuchi M, Tani M. Impaired biosynthesis of ergosterol confers resistance to complex sphingolipid biosynthesis inhibitor aureobasidin A in a PDR16-dependent manner. Sci Rep 2023; 13:11179. [PMID: 37429938 DOI: 10.1038/s41598-023-38237-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 07/05/2023] [Indexed: 07/12/2023] Open
Abstract
Complex sphingolipids and sterols are coordinately involved in various cellular functions, e.g. the formation of lipid microdomains. Here we found that budding yeast exhibits resistance to an antifungal drug, aureobasidin A (AbA), an inhibitor of Aur1 catalyzing the synthesis of inositolphosphorylceramide, under impaired biosynthesis of ergosterol, which includes deletion of ERG6, ERG2, or ERG5 involved in the final stages of the ergosterol biosynthesis pathway or miconazole; however, these defects of ergosterol biosynthesis did not confer resistance against repression of expression of AUR1 by a tetracycline-regulatable promoter. The deletion of ERG6, which confers strong resistance to AbA, results in suppression of a reduction in complex sphingolipids and accumulation of ceramides on AbA treatment, indicating that the deletion reduces the effectiveness of AbA against in vivo Aur1 activity. Previously, we reported that a similar effect to AbA sensitivity was observed when PDR16 or PDR17 was overexpressed. It was found that the effect of the impaired biosynthesis of ergosterol on the AbA sensitivity is completely abolished on deletion of PDR16. In addition, an increase in the expression level of Pdr16 was observed on the deletion of ERG6. These results suggested that abnormal ergosterol biosynthesis confers resistance to AbA in a PDR16-dependent manner, implying a novel functional relationship between complex sphingolipids and ergosterol.
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Affiliation(s)
- Shizuka Fukuda
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Yushi Kono
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Yohei Ishibashi
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Mitsuaki Tabuchi
- Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki-cho, Kagawa, 761-0795, Japan
| | - Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
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2
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Götze S, Vij R, Burow K, Thome N, Urbat L, Schlosser N, Pflanze S, Müller R, Hänsch VG, Schlabach K, Fazlikhani L, Walther G, Dahse HM, Regestein L, Brunke S, Hube B, Hertweck C, Franken P, Stallforth P. Ecological Niche-Inspired Genome Mining Leads to the Discovery of Crop-Protecting Nonribosomal Lipopeptides Featuring a Transient Amino Acid Building Block. J Am Chem Soc 2023; 145:2342-2353. [PMID: 36669196 PMCID: PMC9897216 DOI: 10.1021/jacs.2c11107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Indexed: 01/22/2023]
Abstract
Investigating the ecological context of microbial predator-prey interactions enables the identification of microorganisms, which produce multiple secondary metabolites to evade predation or to kill the predator. In addition, genome mining combined with molecular biology methods can be used to identify further biosynthetic gene clusters that yield new antimicrobials to fight the antimicrobial crisis. In contrast, classical screening-based approaches have limitations since they do not aim to unlock the entire biosynthetic potential of a given organism. Here, we describe the genomics-based identification of keanumycins A-C. These nonribosomal peptides enable bacteria of the genus Pseudomonas to evade amoebal predation. While being amoebicidal at a nanomolar level, these compounds also exhibit a strong antimycotic activity in particular against the devastating plant pathogen Botrytis cinerea and they drastically inhibit the infection of Hydrangea macrophylla leaves using only supernatants of Pseudomonas cultures. The structures of the keanumycins were fully elucidated through a combination of nuclear magnetic resonance, tandem mass spectrometry, and degradation experiments revealing an unprecedented terminal imine motif in keanumycin C extending the family of nonribosomal amino acids by a highly reactive building block. In addition, chemical synthesis unveiled the absolute configuration of the unusual dihydroxylated fatty acid of keanumycin A, which has not yet been reported for this lipodepsipeptide class. Finally, a detailed genome-wide microarray analysis of Candida albicans exposed to keanumycin A shed light on the mode-of-action of this potential natural product lead, which will aid the development of new pharmaceutical and agrochemical antifungals.
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Affiliation(s)
- Sebastian Götze
- Department
of Paleobiotechnology, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Raghav Vij
- Department
of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural
Product Research and Infection Biology, Hans Knöll Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Katja Burow
- Research
Centre for Horticultural Crops (FGK), Fachhochschule
Erfurt, Kühnhäuser
Straße 101, 99090 Erfurt, Germany
| | - Nicola Thome
- Department
of Paleobiotechnology, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Lennart Urbat
- Department
of Paleobiotechnology, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Nicolas Schlosser
- Bio
Pilot Plant, Leibniz Institute for Natural Product Research and Infection
Biology, Hans Knöll Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Sebastian Pflanze
- Department
of Paleobiotechnology, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Rita Müller
- Department
of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural
Product Research and Infection Biology, Hans Knöll Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Veit G. Hänsch
- Department
of Biomolecular Chemistry, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Kevin Schlabach
- Department
of Paleobiotechnology, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Leila Fazlikhani
- Research
Centre for Horticultural Crops (FGK), Fachhochschule
Erfurt, Kühnhäuser
Straße 101, 99090 Erfurt, Germany
| | - Grit Walther
- National
Reference Center for Invasive Fungal Infections, Hans Knöll Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Hans-Martin Dahse
- Department
of Infection Biology, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Lars Regestein
- Bio
Pilot Plant, Leibniz Institute for Natural Product Research and Infection
Biology, Hans Knöll Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Sascha Brunke
- Department
of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural
Product Research and Infection Biology, Hans Knöll Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Bernhard Hube
- Department
of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural
Product Research and Infection Biology, Hans Knöll Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Christian Hertweck
- Department
of Biomolecular Chemistry, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
| | - Philipp Franken
- Research
Centre for Horticultural Crops (FGK), Fachhochschule
Erfurt, Kühnhäuser
Straße 101, 99090 Erfurt, Germany
- Molecular
Phytopathology, Friedrich Schiller University, 07745 Jena, Germany
| | - Pierre Stallforth
- Department
of Paleobiotechnology, Leibniz Institute for Natural Product Research
and Infection Biology, Hans Knöll
Institute, Beutenbergstraße 11a, 07745 Jena, Germany
- Faculty
of Chemistry and Earth Sciences, Institute of Organic Chemistry and
Macromolecular Chemistry, Friedrich Schiller
University Jena, Humboldtstraße 10, 07743 Jena, Germany
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3
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Urita A, Ishibashi Y, Kawaguchi R, Yanase Y, Tani M. Crosstalk between protein kinase A and the HOG pathway under impaired biosynthesis of complex sphingolipids in budding yeast. FEBS J 2021; 289:766-786. [PMID: 34492172 DOI: 10.1111/febs.16188] [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: 03/25/2021] [Revised: 07/03/2021] [Accepted: 09/06/2021] [Indexed: 11/28/2022]
Abstract
Complex sphingolipids are important components of the lipid bilayer of budding yeast Saccharomyces cerevisiae, and a defect of the biosynthesis causes widespread cellular dysfunction. In this study, we found that mutations causing upregulation of the cAMP/protein kinase A (PKA) pathway cause hypersensitivity to the defect of complex sphingolipid biosynthesis caused by repression of AUR1 encoding inositol phosphorylceramide synthase, whereas loss of PKA confers resistance to the defect. Loss of PDE2 encoding cAMP phosphodiesterase or PKA did not affect the reduction in complex sphingolipid levels and ceramide accumulation caused by AUR1 repression, suggesting that the change in sensitivity to the AUR1 repression due to the mutation of the cAMP/PKA pathway is not caused by exacerbation or suppression of the abnormal metabolism of sphingolipids. We also identified PBS2 encoding MAPKK in the high-osmolarity glycerol (HOG) pathway as a multicopy suppressor gene that rescues the hypersensitivity to AUR1 repression caused by deletion of IRA2, which causes hyperactivation of the cAMP/PKA pathway. Since the HOG pathway has been identified as one of the rescue systems against the growth defect caused by the impaired biosynthesis of complex sphingolipids, it was assumed that PKA affects activation of the HOG pathway under AUR1-repressive conditions. Under AUR1-repressive conditions, hyperactivation of PKA suppressed the phosphorylation of Hog1, MAPK in the HOG pathway, and transcriptional activation downstream of the HOG pathway. These findings suggested that PKA is possibly involved in the avoidance of excessive activation of the HOG pathway under impaired biosynthesis of complex sphingolipids.
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Affiliation(s)
- Atsuya Urita
- Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Yohei Ishibashi
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Ryotaro Kawaguchi
- Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Yukimi Yanase
- Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka, Japan
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4
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Proper regulation of inositolphosphorylceramide levels is required for acquirement of low pH resistance in budding yeast. Sci Rep 2020; 10:10792. [PMID: 32612142 PMCID: PMC7329899 DOI: 10.1038/s41598-020-67734-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 06/12/2020] [Indexed: 02/04/2023] Open
Abstract
All organisms have stress response systems to protect themselves from various environmental stresses, and regulation of membrane lipids is thought to play an important role in acquirement of stress tolerance. Complex sphingolipids in the yeast Saccharomyces cerevisiae are classified into three types based on differences in the structure of the polar head group, and the compositions and quantities of complex sphingolipids in biomembranes are tightly regulated. In this study, we found that the accumulation of inositol phosphorylceramides (IPCs) due to a defect of mannosylinositol phosphorylceramide biosynthesis (sur1∆ csh1∆), i.e., disruption of the balance of the composition of complex sphingolipids, causes hypersensitivity to low pH conditions (pH 4.0–2.5). Furthermore, screening of suppressor mutations that confer low pH resistance to sur1∆ csh1∆ cells revealed that a change in ergosterol homeostasis at plasma membranes can rescue the hypersensitivity, suggesting the functional relationship between complex sphingolipids and ergosterol under low pH conditions. Under low pH conditions, wild-type yeast cells exhibited decreases in IPC levels, and forced enhancement of the biosynthesis of IPCs causes low pH hypersensitivity. Thus, it was suggested that the accumulation of IPCs is detrimental to yeast under low pH conditions, and downregulation of IPC levels is one of the adaptation mechanisms for low pH conditions.
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5
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Nishimura S, Matsumori N. Chemical diversity and mode of action of natural products targeting lipids in the eukaryotic cell membrane. Nat Prod Rep 2020; 37:677-702. [PMID: 32022056 DOI: 10.1039/c9np00059c] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Covering: up to 2019Nature furnishes bioactive compounds (natural products) with complex chemical structures, yet with simple, sophisticated molecular mechanisms. When natural products exhibit their activities in cells or bodies, they first have to bind or react with a target molecule in/on the cell. The cell membrane is a major target for bioactive compounds. Recently, our understanding of the molecular mechanism of interactions between natural products and membrane lipids progressed with the aid of newly-developed analytical methods. New technology reconnects old compounds with membrane lipids, while new membrane-targeting molecules are being discovered through the screening for antimicrobial potential of natural products. This review article focuses on natural products that bind to eukaryotic membrane lipids, and includes clinically important molecules and key research tools. The chemical diversity of membrane-targeting natural products and the molecular basis of lipid recognition are described. The history of how their mechanism was unveiled, and how these natural products are used in research are also mentioned.
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Affiliation(s)
- Shinichi Nishimura
- Department of Biotechnology, Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Tokyo 113-8657, Japan.
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6
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Arita N, Sakamoto R, Tani M. Mitochondrial reactive oxygen species-mediated cytotoxicity of intracellularly accumulated dihydrosphingosine in the yeast Saccharomyces cerevisiae. FEBS J 2020; 287:3427-3448. [PMID: 31944552 DOI: 10.1111/febs.15211] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Revised: 11/20/2019] [Accepted: 01/10/2020] [Indexed: 02/06/2023]
Abstract
In eukaryotic cells, the content of sphingoid long-chain bases (LCBs) is generally much lower than that of complex sphingolipids and ceramides, and the quantitative balance of these metabolites in cells is tightly regulated. In the budding yeast Saccharomyces cerevisiae, it has been demonstrated that exogenously added phytosphingosine (PHS) causes a strong growth defect in tryptophan auxotrophic cells, due to delayed uptake of tryptophan from the culture medium; however, the growth inhibitory effect of dihydrosphingosine (DHS) is less than that of PHS in tryptophan auxotrophic cells. Here, we found that, in tryptophan-prototrophic yeast cells, exogenously added DHS is much more toxic than PHS. Exogenously added DHS is converted to PHS, Cers, or LCB 1-phosphates through the action of sphingolipid C4-hydroxylase, Cer synthases, or LCB kinases, respectively; however, suppression of further metabolism of DHS in cells resulted in an increase in the growth inhibitory activity of exogenously added DHS, indicating that DHS itself is causative of the cytotoxicity. The cytotoxicity of DHS was not mediated by Pkh1/2, Sch9, and Ypk1/2 kinases, intracellular targets of LCBs. DHS treatment caused an increase in mitochondria-derived reactive oxygen species, and the cytotoxic effect of DHS was suppressed by depletion of mitochondrial DNA or antioxidant N-acetylcysteine, but enhanced by deletion of SOD1 and SOD2 encoding superoxide dismutases. Thus, collectively, these results indicated that intracellularly accumulated DHS has mitochondrial reactive oxygen species-mediated cytotoxic activity, which is much more potent than that of PHS.
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Affiliation(s)
- Nobuaki Arita
- Department of Chemistry, Faculty of Sciences, Kyushu University, Nishi-ku, Fukuoka, Japan
| | - Risa Sakamoto
- Department of Chemistry, Faculty of Sciences, Kyushu University, Nishi-ku, Fukuoka, Japan
| | - Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University, Nishi-ku, Fukuoka, Japan
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7
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Katsuki Y, Yamaguchi Y, Tani M. Overexpression of PDR16 confers resistance to complex sphingolipid biosynthesis inhibitor aureobasidin A in yeast Saccharomyces cerevisiae. FEMS Microbiol Lett 2019; 365:4733270. [PMID: 29240942 DOI: 10.1093/femsle/fnx255] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 12/11/2017] [Indexed: 12/25/2022] Open
Abstract
Sphingolipids are essential for normal cell growth of yeast Saccharomyces cerevisiae. Aureobasidin A (AbA), an antifungal drug, inhibits Aur1, an enzyme catalyzing the synthesis of inositol phosphorylceramide, and induces a strong growth defect in yeast. In this study, we screened for multicopy suppressor genes that confer resistance to AbA, and identified PDR16. In addition, it was found that PDR17, a paralog of PDR16, also functions as a multicopy suppressor. Pdr16 and Pdr17 belong to a family of phosphatidylinositol transfer proteins; however, cells overexpressing the other members of the family hardly exhibited resistance to AbA. Overexpression of a lipid-binding defective mutant of Pdr16 did not confer the resistance to AbA, indicating that the lipid-binding activity is essential for acquiring resistance to AbA. When expression of the AUR1 gene was repressed by a tetracycline-regulatable promoter, the overexpression of PDR16 or PDR17 did not suppress the growth defect caused by the AUR1 repression. Quantification analysis of complex sphingolipids revealed that in AbA-treated cells, but not in cells in which AUR1 was repressed by the tetracycline-regulatable promoter, the reductions of complex sphingolipid levels were suppressed by the overexpressed PDR16. Thus, it was indicated that the overexpression of PDR16 reduces the effectiveness of AbA against intracellular Aur1 activity.
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Affiliation(s)
- Yuka Katsuki
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-3905, Japan
| | - Yutaro Yamaguchi
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-3905, Japan
| | - Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-3905, Japan
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8
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Ali U, Li H, Wang X, Guo L. Emerging Roles of Sphingolipid Signaling in Plant Response to Biotic and Abiotic Stresses. MOLECULAR PLANT 2018; 11:1328-1343. [PMID: 30336328 DOI: 10.1016/j.molp.2018.10.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 10/04/2018] [Accepted: 10/09/2018] [Indexed: 05/12/2023]
Abstract
Plant sphingolipids are not only structural components of the plasma membrane and other endomembrane systems but also act as signaling molecules during biotic and abiotic stresses. However, the roles of sphingolipids in plant signal transduction in response to environmental cues are yet to be investigated in detail. In this review, we discuss the signaling roles of sphingolipid metabolites with a focus on plant sphingolipids. We also mention some microbial sphingolipids that initiate signals during their interaction with plants, because of the limited literatures on their plant analogs. The equilibrium of nonphosphorylated and phosphorylated sphingolipid species determine the destiny of plant cells, whereas molecular connections among the enzymes responsible for this equilibrium in a coordinated signaling network are poorly understood. A mechanistic link between the phytohormone-sphingolipid interplay has also not yet been fully understood and many key participants involved in this complex interaction operating under stress conditions await to be identified. Future research is needed to fill these gaps and to better understand the signal pathways of plant sphingolipids and their interplay with other signals in response to environmental stresses.
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Affiliation(s)
- Usman Ali
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
| | - Hehuan Li
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
| | - Xuemin Wang
- Department of Biology, University of Missouri, St. Louis, MO 63121, USA; Donald Danforth Plant Science Center, St. Louis, MO 63132, USA
| | - Liang Guo
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China.
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9
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Yamaguchi Y, Katsuki Y, Tanaka S, Kawaguchi R, Denda H, Ikeda T, Funato K, Tani M. Protective role of the HOG pathway against the growth defect caused by impaired biosynthesis of complex sphingolipids in yeast Saccharomyces cerevisiae. Mol Microbiol 2017; 107:363-386. [PMID: 29215176 DOI: 10.1111/mmi.13886] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2017] [Indexed: 02/06/2023]
Abstract
Complex sphingolipids play critical roles in various cellular events in the yeast Saccharomyces cerevisiae. To identify genes that are related to the growth defect caused by disruption of complex sphingolipid biosynthesis, we screened for suppressor mutations and multicopy suppressor genes that confer resistance against repression of AUR1 encoding inositol phosphorylceramide synthase. From the results of this screening, we found that the activation of high-osmolarity glycerol (HOG) pathway is involved in suppression of growth defect caused by impaired biosynthesis of complex sphingolipids. Furthermore, it was found that transcriptional regulation via Msn2, Msn4 and Sko1 is involved in the suppressive effect of the HOG pathway. Lack of the HOG pathway did not enhance the reductions in complex sphingolipid levels or the increase in ceramide level caused by the AUR1 repression, implying that the suppressive effect of the HOG pathway on the growth defect is not attributed to restoration of impaired biosynthesis of complex sphingolipids. On the contrary, the HOG pathway and Msn2/4-mediated transcriptional activation was involved in suppression of aberrant reactive oxygen species accumulation caused by the AUR1 repression. These results indicated that the HOG pathway plays pivotal roles in maintaining cell growth under impaired biosynthesis of complex sphingolipids.
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Affiliation(s)
- Yutaro Yamaguchi
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-3905, Japan
| | - Yuka Katsuki
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-3905, Japan
| | - Seiya Tanaka
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-3905, Japan
| | - Ryotaro Kawaguchi
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-3905, Japan
| | - Hiroto Denda
- Department of Biofunctional Science and Technology, Graduate School of Biosphere Science, Hiroshima University, Kagamiyama 1-4-4, Higashi-Hiroshima 739-8528, Japan
| | - Takuma Ikeda
- Department of Biofunctional Science and Technology, Graduate School of Biosphere Science, Hiroshima University, Kagamiyama 1-4-4, Higashi-Hiroshima 739-8528, Japan
| | - Kouichi Funato
- Department of Biofunctional Science and Technology, Graduate School of Biosphere Science, Hiroshima University, Kagamiyama 1-4-4, Higashi-Hiroshima 739-8528, Japan
| | - Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-3905, Japan
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10
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Begum MA, Shi XX, Tan Y, Zhou WW, Hannun Y, Obeid L, Mao C, Zhu ZR. Molecular Characterization of Rice OsLCB2a1 Gene and Functional Analysis of its Role in Insect Resistance. FRONTIERS IN PLANT SCIENCE 2016; 7:1789. [PMID: 27990147 PMCID: PMC5130998 DOI: 10.3389/fpls.2016.01789] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 11/14/2016] [Indexed: 05/22/2023]
Abstract
In plants, sphingolipids, such as long-chain bases (LCBs), act as bioactive molecules in stress responses. Until now, it is still not clear if these lipids are involved in biotic stress responses to herbivore. Herein we report that a rice LCB gene, OsLCB2a1 encoding a subunit of serine palmitoyltransferase (SPT), a key enzyme responsible for the de novo biosynthesis of sphingolipids, plays a critical role in plant defense response to the brown planthopper (BPH) attack and that its up-regulation protects plants from herbivore infestation. Transcripts of OsLCB2a1 gene in rice seedlings were increased at 4 h, but decreased at 8-24 h after BPH attack. Sphingolipid measurement profiling revealed that overexpression of OsLCB2a1 in Arabidopsis thaliana increased trihydroxylated LCB phytosphingosine (t18:0) and phytoceramide by 1.7 and 1.3-fold, respectively, compared with that of wild type (WT) plants. Transgenic Arabidopsis plants also showed higher callose and wax deposition in leaves than that of WT. Overexpression of OsLCB2a1 gene in A. thaliana reduced the population size of green peach aphid (Myzus persicae). Moreover, the electrical penetration graph (EPG) results indicated that the aphids encounter resistance factors while reaching for the phloem on the transgenic plants. The defense response genes related to salicylic acid signaling pathway, remained uplgulated in the OsLCB2a1-overexpressing transgenic plants. Our data highlight the key functions of OsLCB2a1 in biotic stress response in plants.
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Affiliation(s)
- Mahfuj A. Begum
- State Key Laboratory of Rice Biology, Key Laboratory of Agricultural Entomology, Ministry of Agriculture and Institute of Insect Sciences, Zhejiang UniversityHangzhou, China
| | - Xiao-Xiao Shi
- State Key Laboratory of Rice Biology, Key Laboratory of Agricultural Entomology, Ministry of Agriculture and Institute of Insect Sciences, Zhejiang UniversityHangzhou, China
| | - Ye Tan
- State Key Laboratory of Rice Biology, Key Laboratory of Agricultural Entomology, Ministry of Agriculture and Institute of Insect Sciences, Zhejiang UniversityHangzhou, China
| | - Wen-Wu Zhou
- State Key Laboratory of Rice Biology, Key Laboratory of Agricultural Entomology, Ministry of Agriculture and Institute of Insect Sciences, Zhejiang UniversityHangzhou, China
| | - Yusuf Hannun
- Stony Brook Cancer Center, Department of Medicine, The State University of New York at Stony BrookNew York, NY, USA
| | - Lina Obeid
- Stony Brook Cancer Center, Department of Medicine, The State University of New York at Stony BrookNew York, NY, USA
| | - Cungui Mao
- Stony Brook Cancer Center, Department of Medicine, The State University of New York at Stony BrookNew York, NY, USA
| | - Zeng-Rong Zhu
- State Key Laboratory of Rice Biology, Key Laboratory of Agricultural Entomology, Ministry of Agriculture and Institute of Insect Sciences, Zhejiang UniversityHangzhou, China
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11
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Toume M, Tani M. Yeast lacking the amphiphysin family protein Rvs167 is sensitive to disruptions in sphingolipid levels. FEBS J 2016; 283:2911-28. [PMID: 27312128 DOI: 10.1111/febs.13783] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 05/23/2016] [Accepted: 06/15/2016] [Indexed: 12/13/2022]
Abstract
Rvs167 and Rvs161 in Saccharomyces cerevisiae are amphiphysin family proteins, which are involved in several important cellular events, such as invagination and scission of endocytic vesicles, and actin cytoskeleton organization. It has been reported that cellular dysfunctions caused by deletion of RVS167 or RVS161 are rescued by deletion of specific nonessential sphingolipid-metabolizing enzyme genes. Here, we found that yeast cells lacking RVS167 or RVS161 exhibit a decrease in sphingolipid levels. In rvs167∆ cells, the expression level of Orm2, a negative regulator of serine palmitoyltransferase (SPT) catalyzing the initial step of sphingolipid biosynthesis, was increased in a calcineurin-dependent manner, and the decrease in sphingolipid levels in rvs167∆ cells was reversed on deletion of ORM2. Moreover, repression of both ORM1 and ORM2 expression or overexpression of SPT caused a strong growth defect of rvs167∆ cells, indicating that enhancement of de novo sphingolipid biosynthesis is detrimental to rvs167∆ cells. In contrast, partial repression of LCB1-encoding SPT suppressed abnormal phenotypes caused by the deletion of RVS167, including supersensitivity to high temperature and salt stress, and impairment of endocytosis and actin cytoskeleton organization. In addition, the partial repression of SPT activity suppressed the temperature supersensitivity and abnormal vacuolar morphology caused by deletion of VPS1 encoding a dynamin-like GTPase, which is required for vesicle scission and is functionally closely related to Rvs167/Rvs161, whereas repression of both ORM1 and ORM2 expression in vps1∆ cells caused a growth defect. Thus, it was suggested that proper regulation of SPT activity is indispensable for amphiphysin-deficient cells.
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Affiliation(s)
- Moeko Toume
- Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka, Japan
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Tani M. Structure–Function Relationship of Complex Sphingolipids in Yeast. TRENDS GLYCOSCI GLYC 2016. [DOI: 10.4052/tigg.1509.1j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University
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13
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Affiliation(s)
- Motohiro Tani
- Department of Chemistry, Faculty of Sciences, Kyushu University
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14
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Tani M, Toume M. Alteration of complex sphingolipid composition and its physiological significance in yeast Saccharomyces cerevisiae lacking vacuolar ATPase. Microbiology (Reading) 2015; 161:2369-83. [DOI: 10.1099/mic.0.000187] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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