1
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Cassandri M, Porrazzo A, Pomella S, Noce B, Zwergel C, Aiello FA, Vulcano F, Milazzo L, Camero S, Pajalunga D, Spada M, Manzi V, Gravina GL, Codenotti S, Piccione M, Tomaciello M, Signore M, Barillari G, Marchese C, Fanzani A, De Angelis B, Quintarelli C, Vakoc CR, Chen EY, Megiorni F, Locatelli F, Valente S, Mai A, Rota R, Marampon F. HDAC3 genetic and pharmacologic inhibition radiosensitizes fusion positive rhabdomyosarcoma by promoting DNA double-strand breaks. Cell Death Discov 2024; 10:351. [PMID: 39107280 PMCID: PMC11303816 DOI: 10.1038/s41420-024-02115-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: 02/07/2024] [Revised: 07/16/2024] [Accepted: 07/29/2024] [Indexed: 08/09/2024] Open
Abstract
Radiotherapy (RT) plays a critical role in the management of rhabdomyosarcoma (RMS), the prevalent soft tissue sarcoma in childhood. The high risk PAX3-FOXO1 fusion-positive subtype (FP-RMS) is often resistant to RT. We have recently demonstrated that inhibition of class-I histone deacetylases (HDACs) radiosensitizes FP-RMS both in vitro and in vivo. However, HDAC inhibitors exhibited limited success on solid tumors in human clinical trials, at least in part due to the presence of off-target effects. Hence, identifying specific HDAC isoforms that can be targeted to radiosensitize FP-RMS is imperative. We, here, found that only HDAC3 silencing, among all class-I HDACs screened by siRNA, radiosensitizes FP-RMS cells by inhibiting colony formation. Thus, we dissected the effects of HDAC3 depletion using CRISPR/Cas9-dependent HDAC3 knock-out (KO) in FP-RMS cells, which resulted in Endoplasmatic Reticulum Stress activation, ERK inactivation, PARP1- and caspase-dependent apoptosis and reduced stemness when combined with irradiation compared to single treatments. HDAC3 loss-of-function increased DNA damage in irradiated cells augmenting H2AX phosphorylation and DNA double-strand breaks (DSBs) and counteracting irradiation-dependent activation of ATM and DNA-Pkcs as well as Rad51 protein induction. Moreover, HDAC3 depletion hampers FP-RMS tumor growth in vivo and maximally inhibits the growth of irradiated tumors compared to single approaches. We, then, developed a new HDAC3 inhibitor, MC4448, which showed specific cell anti-tumor effects and mirrors the radiosensitizing effects of HDAC3 depletion in vitro synergizing with ERKs inhibition. Overall, our findings dissect the pro-survival role of HDAC3 in FP-RMS and suggest HDAC3 genetic or pharmacologic inhibition as a new promising strategy to overcome radioresistance in this tumor.
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Affiliation(s)
- Matteo Cassandri
- Department of Radiotherapy, Policlinico Umberto I, "Sapienza" University of Rome, Rome, Italy
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Antonella Porrazzo
- Department of Radiotherapy, Policlinico Umberto I, "Sapienza" University of Rome, Rome, Italy
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Silvia Pomella
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
- Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Beatrice Noce
- Department of Drug Chemistry and Technologies, "Sapienza" University of Rome, Rome, Italy
| | - Clemens Zwergel
- Department of Drug Chemistry and Technologies, "Sapienza" University of Rome, Rome, Italy
| | - Francesca Antonella Aiello
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Francesca Vulcano
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Luisa Milazzo
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Simona Camero
- Department of Life Sciences, Health and Health Professions, Link Campus University, Rome, Italy
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - Deborah Pajalunga
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Massimo Spada
- Center of Animal Research and Welfare, Istituto Superiore di Sanità, Rome, Italy
| | - Valeria Manzi
- Department of Radiotherapy, Policlinico Umberto I, "Sapienza" University of Rome, Rome, Italy
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Giovanni Luca Gravina
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Silvia Codenotti
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Michela Piccione
- Confocal Microscopy Core Facility, Ospedale Pediatrico Bambino Gesù, IRCCS, Rome, Italy
| | - Miriam Tomaciello
- Department of Radiotherapy, Policlinico Umberto I, "Sapienza" University of Rome, Rome, Italy
| | - Michele Signore
- RPPA Unit, Proteomics Area, Core Facilities, Istituto Superiore di Sanità, Rome, Italy
| | - Giovanni Barillari
- Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Cinzia Marchese
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - Alessandro Fanzani
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Biagio De Angelis
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Concetta Quintarelli
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | | | - Eleanor Y Chen
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Francesca Megiorni
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - Franco Locatelli
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
- Department of Life Sciences and Public Health, Catholic University of the Sacred Heart, Rome, Italy
| | - Sergio Valente
- Department of Drug Chemistry and Technologies, "Sapienza" University of Rome, Rome, Italy
| | - Antonello Mai
- Department of Drug Chemistry and Technologies, "Sapienza" University of Rome, Rome, Italy
- Pasteur Institute, Cenci-Bolognetti Foundation, "Sapienza" University of Rome, Rome, Italy
| | - Rossella Rota
- Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Francesco Marampon
- Department of Radiotherapy, Policlinico Umberto I, "Sapienza" University of Rome, Rome, Italy.
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2
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Galvin J, Curran E, Arteaga F, Goossens A, Aubuchon-Endsley N, McMurray MA, Moore J, Hansen KC, Chial HJ, Potter H, Brodsky JL, Coughlan CM. Proteasome activity modulates amyloid toxicity. FEMS Yeast Res 2022; 22:foac004. [PMID: 35150241 PMCID: PMC8906389 DOI: 10.1093/femsyr/foac004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 12/14/2021] [Accepted: 02/10/2022] [Indexed: 11/13/2022] Open
Abstract
Alzheimer's disease (AD) is responsible for 60%-80% of identified cases of dementia. While the generation and accumulation of amyloid precursor protein (APP) fragments is accepted as a key step in AD pathogenesis, the precise role of these fragments remains poorly understood. To overcome this deficit, we induced the expression of the soluble C-terminal fragment of APP (C99), the rate-limiting peptide for the generation of amyloid fragments, in yeast that contain thermosensitive mutations in genes encoding proteasome subunits. Our previous work with this system demonstrated that these proteasome-deficient yeast cells, expressing C99 when proteasome activity was blunted, generated amyloid fragments similar to those observed in AD patients. We now report the phenotypic repercussions of inducing C99 expression in proteasome-deficient cells. We show increased levels of protein aggregates, cellular stress and chaperone expression, electron-dense accumulations in the nuclear envelope/ER, abnormal DNA condensation, and an induction of apoptosis. Taken together, these findings suggest that the generation of C99 and its associated fragments in yeast cells with compromised proteasomal activity results in phenotypes that may be relevant to the neuropathological processes observed in AD patients. These data also suggest that this yeast model should be useful for testing therapeutics that target AD-associated amyloid, since it allows for the assessment of the reversal of the perturbed cellular physiology observed when degradation pathways are dysfunctional.
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Affiliation(s)
- John Galvin
- Department of Biological Sciences, University of Denver , Denver CO 80208, United States
| | - Elizabeth Curran
- Department of Biological Sciences, University of Denver , Denver CO 80208, United States
| | - Francisco Arteaga
- Department of Biological Sciences, University of Denver , Denver CO 80208, United States
| | - Alicia Goossens
- Department of Biological Sciences, University of Denver , Denver CO 80208, United States
| | - Nicki Aubuchon-Endsley
- Department of Biological Sciences, University of Denver , Denver CO 80208, United States
| | - Michael A McMurray
- Department of Cell and Developmental Biology, Anschutz Medical Campus, Aurora, CO 80045, United States
| | - Jeffrey Moore
- Department of Cell and Developmental Biology, Anschutz Medical Campus, Aurora, CO 80045, United States
| | - Kirk C Hansen
- Department of Biochemistry and Molecular Genetics, Anschutz Medical Campus, Aurora, CO 80045, United States
| | - Heidi J Chial
- University of Colorado Alzheimer's and Cognition Center (CUACC), Department of Neurology, School of Medicine, Anschutz Medical Campus, Aurora 80045, United States
| | - Huntington Potter
- University of Colorado Alzheimer's and Cognition Center (CUACC), Department of Neurology, School of Medicine, Anschutz Medical Campus, Aurora 80045, United States
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, United States
| | - Christina M Coughlan
- University of Colorado Alzheimer's and Cognition Center (CUACC), Department of Neurology, School of Medicine, Anschutz Medical Campus, Aurora 80045, United States
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3
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Gallo GL, Valko A, Aguilar NH, Weisz AD, D'Alessio C. A novel fission yeast platform to model N-glycosylation and the bases of congenital disorders of glycosylation Type I. J Cell Sci 2021; 135:274232. [PMID: 34851357 DOI: 10.1242/jcs.259167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 11/18/2021] [Indexed: 11/20/2022] Open
Abstract
Congenital Disorders of Glycosylation Type I (CDG-I) are inherited human diseases caused by deficiencies in lipid-linked oligosaccharide (LLO) synthesis or the glycan transfer to proteins during N-glycosylation. We constructed a platform of 16 Schizosaccharomyces pombe mutant strains that synthesize all possible theoretical combinations of LLOs containing three to zero Glc and nine to five Man. The occurrence of unexpected LLOs suggested the requirement of specific Man residues for glucosyltransferases activities. We then quantified protein hypoglycosylation in each strain and found that in S. pombe the presence of Glc in the LLO is more relevant to the transfer efficiency than the amount of Man residues. Surprisingly, a decrease in the number of Man in glycans somehow improved the glycan transfer. The most severe hypoglycosylation was produced in cells completely lacking Glc and having a high number of Man. This deficiency could be reverted by expressing a single subunit OST with a broad range of substrate specificity. Our work shows the usefulness of this new S. pombe set of mutants as a platform to model the molecular bases of human CDG-I diseases.
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Affiliation(s)
- Giovanna L Gallo
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Instituto de Biociencias, Biotecnología y Biología Traslacional (iB3), Buenos Aires C1428EGA, Argentina.,Consejo Nacional de investigaciones Científicas y Técnicas (CONICET), Argentina.,Fundación Instituto Leloir, Buenos Aires, C1405BWE, Argentina
| | - Ayelen Valko
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Instituto de Biociencias, Biotecnología y Biología Traslacional (iB3), Buenos Aires C1428EGA, Argentina.,Consejo Nacional de investigaciones Científicas y Técnicas (CONICET), Argentina.,Fundación Instituto Leloir, Buenos Aires, C1405BWE, Argentina
| | - Nathalia Herrera Aguilar
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Instituto de Biociencias, Biotecnología y Biología Traslacional (iB3), Buenos Aires C1428EGA, Argentina.,Fundación Instituto Leloir, Buenos Aires, C1405BWE, Argentina
| | - Ariel D Weisz
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Instituto de Biociencias, Biotecnología y Biología Traslacional (iB3), Buenos Aires C1428EGA, Argentina
| | - Cecilia D'Alessio
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Instituto de Biociencias, Biotecnología y Biología Traslacional (iB3), Buenos Aires C1428EGA, Argentina.,Consejo Nacional de investigaciones Científicas y Técnicas (CONICET), Argentina
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4
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Corral-Ramos C, Barrios R, Ayté J, Hidalgo E. TOR and MAP kinase pathways synergistically regulate autophagy in response to nutrient depletion in fission yeast. Autophagy 2021; 18:375-390. [PMID: 34157946 DOI: 10.1080/15548627.2021.1935522] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
General autophagy is an evolutionarily conserved process in eukaryotes, by which intracellular materials are transported into and degraded inside lysosomes or vacuoles, with the main goal of recycling those materials during periods of starvation. The molecular bases of autophagy have been widely described in Saccharomyces cerevisiae, and the specific roles of Atg proteins in the process were first characterized in this model system. Important contributions have been made in Schizosaccharomyces pombe highlighting the evolutionary similarity and, at the same time, diversity of Atg components in autophagy. However, little is known regarding signals, pathways and role of autophagy in this distant yeast. Here, we undertake a global approach to investigate the signals, the pathways and the consequences of autophagy activation. We demonstrate that not only nitrogen but several nutritional deprivations including lack of carbon, sulfur, phosphorus or leucine sources, trigger autophagy, and that the TORC1, TORC2 and MAP kinase Sty1 pathways control the onset of autophagy. Furthermore, we identify an unexpected phenotype of autophagy-defective mutants, namely their inability to survive in the absence of leucine when biosynthesis of this amino acid is impaired.Abbreviations: ATG: autophagy-related; cAMP: cyclic adenosine monophosphate; cDNA: complementary deoxyribonucleic acid; GFP: green fluorescence protein; Gluc: glucose; Leu: leucine; MAP: mitogen-activated protein; MM: minimal medium; PI: propidium iodine; PKA: protein kinase A; RNA: ribonucleic acid; RT-qPCR: real time quantitative polymerase chain reaction; S. cerevisiae: Saccharomyces cerevisiae; S. pombe: Schizosaccharomyces pombe; TCA: trichloroacetic acid; TOR: target of rapamycin; TORC1: target of rapamycin complex 1; TORC2: target of rapamycin complex 2; YE5S: yeast extract 5 amino acid supplemented.
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Affiliation(s)
| | - Rubén Barrios
- Oxidative Stress and Cell Cycle Group, Universitat Pompeu Fabra, Barcelona, Spain
| | - José Ayté
- Oxidative Stress and Cell Cycle Group, Universitat Pompeu Fabra, Barcelona, Spain
| | - Elena Hidalgo
- Oxidative Stress and Cell Cycle Group, Universitat Pompeu Fabra, Barcelona, Spain
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5
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Jiang G, Liu Q, Kato T, Miao H, Gao X, Liu K, Chen S, Sakamoto N, Kuno T, Fang Y. Role of mitochondrial complex III/IV in the activation of transcription factor Rst2 in Schizosaccharomyces pombe. Mol Microbiol 2021; 115:1323-1338. [PMID: 33400299 DOI: 10.1111/mmi.14678] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 12/31/2020] [Accepted: 12/31/2020] [Indexed: 11/30/2022]
Abstract
Mitochondria play essential roles in eukaryotic cells for glucose metabolism to produce ATP. In Schizosaccharomyces pombe, transcription factor Rst2 can be activated upon glucose deprivation. However, the link between Rst2 and mitochondrial function remains elusive. Here, we monitored Rst2 transcriptional activity in living cells using a Renilla luciferase reporter system, and found that inhibition of mitochondrial complex III/IV caused cells to produce reactive oxygen species (ROS) and nitric oxide (NO), which in turn activated Rst2. Furthermore, Rst2-GFP was observed to translocate from cytoplasm to nucleus upon mitochondrial complex III/IV inhibitors treatment, and deletion of genes associated with complex III/IV resulted in delayed process of Rst2-GFP nuclear exportation under glucose-rich condition. In particular, we found that Rst2 was phosphorylated following the treatment of complex III/IV inhibitors or SNAP. Altogether, our findings suggest that mitochondrial complex III/IV participates in the activation of Rst2 through ROS and NO generation in Schizosaccharomyces pombe.
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Affiliation(s)
- Guanglie Jiang
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China
| | - Qiannan Liu
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China
| | - Toshiaki Kato
- Division of Food and Drug Evaluation Science, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Hao Miao
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China
| | - Xiang Gao
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China
| | - Kun Liu
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China
| | - Si Chen
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China
| | - Norihiro Sakamoto
- Division of Food and Drug Evaluation Science, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Takayoshi Kuno
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China.,Division of Food and Drug Evaluation Science, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Yue Fang
- Department of Microbial and Biochemical Pharmacy, School of Pharmacy, China Medical University, Shenyang, China
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6
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Ohashi T, Tanaka T, Tanaka N, Takegawa K. SpMnn9p and SpAnp1p form a protein complex involved in mannan synthesis in the fission yeast Schizosaccharomyces pombe. J Biosci Bioeng 2020; 130:335-340. [DOI: 10.1016/j.jbiosc.2020.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/02/2020] [Accepted: 06/07/2020] [Indexed: 01/22/2023]
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7
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Nitrogen starvation reveals the mitotic potential of mutants in the S/MAPK pathways. Nat Commun 2020; 11:1973. [PMID: 32332728 PMCID: PMC7181643 DOI: 10.1038/s41467-020-15880-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 03/24/2020] [Indexed: 02/08/2023] Open
Abstract
The genetics of quiescence is an emerging field compared to that of growth, yet both states generate spontaneous mutations and genetic diversity fueling evolution. Reconciling mutation rates in dividing conditions and mutation accumulation as a function of time in non-dividing situations remains a challenge. Nitrogen-starved fission yeast cells reversibly arrest proliferation, are metabolically active and highly resistant to a variety of stresses. Here, we show that mutations in stress- and mitogen-activated protein kinase (S/MAPK) signaling pathways are enriched in aging cultures. Targeted resequencing and competition experiments indicate that these mutants arise in the first month of quiescence and expand clonally during the second month at the expense of the parental population. Reconstitution experiments show that S/MAPK modules mediate the sacrifice of many cells for the benefit of some mutants. These findings suggest that non-dividing conditions promote genetic diversity to generate a social cellular environment prone to kin selection. Nitrogen-starved fission yeast cells survive for weeks without dividing. Here, the authors show that some of these surviving cells accumulate mutations in the stress- and mitogen-activated protein kinase pathways and outcompete their parental cells, which provide nutrients for the mutant cells.
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8
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Hu YM, Boehm DM, Chung H, Wilson S, Bird AJ. Zinc-dependent activation of the Pho8 alkaline phosphatase in Schizosaccharomyces pombe. J Biol Chem 2019; 294:12392-12404. [PMID: 31239353 PMCID: PMC6699849 DOI: 10.1074/jbc.ra119.007371] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 06/20/2019] [Indexed: 01/23/2023] Open
Abstract
Genome-wide analyses have revealed that during metal ion starvation, many cells undergo programmed changes in their transcriptome or proteome that lower the levels of abundant metalloproteins, conserving metal ions for more critical functions. Here we investigated how changes in cellular zinc status affect the expression and activity of the zinc-requiring Pho8 alkaline phosphatase from fission yeast (Schizosaccharomyces pombe). In S. pombe, Pho8 is a membrane-tethered and processed glycoprotein that resides in the vacuole. Using alkaline phosphatase activity assays along with various biochemical analyses, we found that Pho8 is active when zinc is plentiful and inactive when zinc is limited. Although Pho8 activity depended on zinc, we also found that higher levels of pho8 mRNAs and Pho8 protein accumulate in zinc-deficient cells. To gain a better understanding of the inverse relationship between pho8 mRNA levels and Pho8 activity, we examined the effects of zinc on the stability and processing of the Pho8 protein. We show that Pho8 is processed regardless of zinc status and that mature Pho8 accumulates under all conditions. We also noted that alkaline phosphatase activity is rapidly restored when zinc is resupplied to cells, even in the presence of the protein synthesis inhibitor cycloheximide. Our results suggest that S. pombe cells maintain inactive pools of Pho8 proteins under low-zinc conditions and that these pools facilitate rapid restoration of Pho8 activity when zinc ions become available.
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Affiliation(s)
- Ya-Mei Hu
- Department of Human Nutrition, Ohio State University, Columbus, Ohio 43210
| | - Derek M Boehm
- Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
| | - Hak Chung
- Ohio State University Interdisciplinary Nutrition Program, Ohio State University, Columbus, Ohio 43210
| | - Stevin Wilson
- Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
| | - Amanda J Bird
- Department of Human Nutrition, Ohio State University, Columbus, Ohio 43210; Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210; Center for RNA Biology, Ohio State University, Columbus, Ohio 43210.
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9
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Gallo GL, Valko A, Aramburu SI, Etchegaray E, Völker C, Parodi AJ, D'Alessio C. Abrogation of glucosidase I-mediated glycoprotein deglucosylation results in a sick phenotype in fission yeasts: Model for the human MOGS-CDG disorder. J Biol Chem 2018; 293:19957-19973. [PMID: 30389790 DOI: 10.1074/jbc.ra118.004844] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 10/30/2018] [Indexed: 11/06/2022] Open
Abstract
Glucosidase I (GI) removes the outermost glucose from protein-linked Glc3Man9GlcNAc2 (G3M9) in the endoplasmic reticulum (ER). Individuals with congenital disorders of glycosylation MOGS-CDG bear mutations in the GI-encoding gene (gls1). Although GI absence has been reported to produce lethality in Schizosaccharomyces pombe yeasts, here we obtained two viable Δgls1 mutants, one with a very sick but not lethal phenotype (Δgls1-S) and the other with a healthier one (Δgls1-H). The sick strain displayed only G3M9 as an ER protein-linked oligosaccharide, whereas the healthier strain had both G3M9 and Man9GlcNAc2 The lipid-linked oligosaccharide patterns of the two strains revealed that the most abundantly formed glycans were G3M9 in Δgls1-S and Glc2Man9GlcNAc2 in Δgls1-H, suggesting reduced Alg10p glucosyltransferase activity in the Δgls1-H strain. A mutation in the alg10 + gene was indeed observed in this strain. Our results indicated that abrogated G3M9 deglucosylation was responsible for the severe defects observed in Δgls1-S cells. Further studies disclosed that the defects could not be ascribed to disruption of glycoprotein entrance into calnexin-folding cycles, inhibition of the oligosaccharyltransferase by transfer reaction products, or reduced proteasomal degradation of misfolded glycoproteins. Lack of triglucosylated glycoprotein deglucosylation neither significantly prevented glycan elongation in the Golgi nor modified the overall cell wall monosaccharide composition. Nevertheless, it resulted in a distorted cell wall and in the absence of underlying ER membranes. Furthermore, Golgi expression of human endomannosidase partially restored normal growth in Δgls1-S cells. We propose that accumulation of G3M9-bearing glycoproteins is toxic and at least partially responsible for defects observed in MOGS-CDG.
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Affiliation(s)
- Giovanna L Gallo
- From the Fundación Instituto Leloir-IIBBA, CONICET, Buenos Aires C1405BWE, Argentine
| | - Ayelén Valko
- From the Fundación Instituto Leloir-IIBBA, CONICET, Buenos Aires C1405BWE, Argentine
| | - Sofía I Aramburu
- From the Fundación Instituto Leloir-IIBBA, CONICET, Buenos Aires C1405BWE, Argentine
| | - Emiliana Etchegaray
- From the Fundación Instituto Leloir-IIBBA, CONICET, Buenos Aires C1405BWE, Argentine
| | - Christof Völker
- the Institute of Biochemistry and Molecular Biology Medical Faculty, University of Bonn, 53115 Bonn, Germany, and
| | - Armando J Parodi
- From the Fundación Instituto Leloir-IIBBA, CONICET, Buenos Aires C1405BWE, Argentine
| | - Cecilia D'Alessio
- From the Fundación Instituto Leloir-IIBBA, CONICET, Buenos Aires C1405BWE, Argentine,; the Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentine.
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10
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Cho MK, Shin HS. Mechanotransduction-Induced Lipid Production System with High Robustness and Controllability for Microalgae. Sci Rep 2016; 6:32860. [PMID: 27609701 PMCID: PMC5016897 DOI: 10.1038/srep32860] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 08/15/2016] [Indexed: 12/16/2022] Open
Abstract
Microalgae lipids are a promising energy source, but current biochemical methods of lipid-inductions such as nitrogen deprivation have low process robustness and controllability. Recently, use of mechanotransduction based membrane distortion by applying compression stress in a 2D-microsystem was suggested as a way to overcome these limitations of biochemical induction. However, reproduction in large numbers of cells without cell death has been difficult to overcome because compression for direct membrane distortion reduces culture volume and leads to cell death due to nutrient deprivation. In this study, a mechanotransduction-induced lipid production (MDLP) system that redirects elastic microbeads to induce membrane distortion of microalgae with alleviating cell death was developed. This system resulted in accumulation of lipid in as little as 4 hr. Once compressed, porous microbeads absorb media and swell simultaneously while homogeneously inducing compression stress of microalgae. The absorbed media within beads could be supplied to adjacent cells and could minimize cell death from nutrient deficiency. All mechanotransduction was confirmed by measuring upregulation of calcium influx and Mat3 genes. The microbeads ensured robustness and controllability in repeated compression/de-compression processes. Overall, the MDLP system has potential for use as a fundamental biodiesel process that requires robustness and controllability.
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Affiliation(s)
- Myung Kwon Cho
- Department of Biological Engineering, Inha University, Incheon, 402-751, Korea
| | - Hwa Sung Shin
- Department of Biological Engineering, Inha University, Incheon, 402-751, Korea
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Asakawa H, Yamamoto TG, Hiraoka Y. Fission yeast meets a legend in Kobe: report of the Eighth International Fission Yeast Meeting. Genes Cells 2015; 20:967-71. [PMID: 26477989 DOI: 10.1111/gtc.12307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 09/14/2015] [Indexed: 11/28/2022]
Abstract
The Eighth International Fission Yeast Meeting, which was held at Ikuta Shrine Hall in Kobe, Japan, from 21 to 26 June 2015, was attended by 327 fission yeast researchers from 25 countries (190 overseas and 137 domestic participants). At this meeting, 124 talks were held and 145 posters were presented. In addition, newly developed database tools were introduced to the community during a workshop. Researchers shared cutting-edge knowledge across broad fields of study, ranging from molecules to evolution, derived from the superior model organism commonly used within the fission yeast community. Intensive discussions and constructive suggestions generated in this meeting will surely advance the understanding of complex biological systems in fission yeast, extending to general eukaryotes.
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Affiliation(s)
- Haruhiko Asakawa
- Graduate School of Frontier Biosciences, Osaka University, Suita, 565-0871, Japan
| | - Takaharu G Yamamoto
- Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology, Kobe, 651-2492, Japan
| | - Yasushi Hiraoka
- Graduate School of Frontier Biosciences, Osaka University, Suita, 565-0871, Japan.,Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology, Kobe, 651-2492, Japan
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