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Wagner ER, Myers KS, Riley NM, Coon JJ, Gasch AP. PKA and HOG signaling contribute separable roles to anaerobic xylose fermentation in yeast engineered for biofuel production. PLoS One 2019; 14:e0212389. [PMID: 31112537 PMCID: PMC6528989 DOI: 10.1371/journal.pone.0212389] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 04/29/2019] [Indexed: 12/25/2022] Open
Abstract
Lignocellulosic biomass offers a sustainable source for biofuel production that does not compete with food-based cropping systems. Importantly, two critical bottlenecks prevent economic adoption: many industrially relevant microorganisms cannot ferment pentose sugars prevalent in lignocellulosic medium, leaving a significant amount of carbon unutilized. Furthermore, chemical biomass pretreatment required to release fermentable sugars generates a variety of toxins, which inhibit microbial growth and metabolism, specifically limiting pentose utilization in engineered strains. Here we dissected genetic determinants of anaerobic xylose fermentation and stress tolerance in chemically pretreated corn stover biomass, called hydrolysate. We previously revealed that loss-of-function mutations in the stress-responsive MAP kinase HOG1 and negative regulator of the RAS/Protein Kinase A (PKA) pathway, IRA2, enhances anaerobic xylose fermentation. However, these mutations likely reduce cells' ability to tolerate the toxins present in lignocellulosic hydrolysate, making the strain especially vulnerable to it. We tested the contributions of Hog1 and PKA signaling via IRA2 or PKA negative regulatory subunit BCY1 to metabolism, growth, and stress tolerance in corn stover hydrolysate and laboratory medium with mixed sugars. We found mutations causing upregulated PKA activity increase growth rate and glucose consumption in various media but do not have a specific impact on xylose fermentation. In contrast, mutation of HOG1 specifically increased xylose usage. We hypothesized improving stress tolerance would enhance the rate of xylose consumption in hydrolysate. Surprisingly, increasing stress tolerance did not augment xylose fermentation in lignocellulosic medium in this strain background, suggesting other mechanisms besides cellular stress limit this strain's ability for anaerobic xylose fermentation in hydrolysate.
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Affiliation(s)
- Ellen R. Wagner
- Great Lakes Bioenergy Research Center, University of Wisconsin–Madison, Madison, WI United States of America
| | - Kevin S. Myers
- Great Lakes Bioenergy Research Center, University of Wisconsin–Madison, Madison, WI United States of America
| | - Nicholas M. Riley
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI United States of America
| | - Joshua J. Coon
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI United States of America
- Genome Center of Wisconsin, University of Wisconsin–Madison, Madison, WI United States of America
- Department of Biomolecular Chemistry, University of Wisconsin–Madison, Madison WI United States of America
- Morgridge Institute for Research, Madison, WI United States of America
| | - Audrey P. Gasch
- Great Lakes Bioenergy Research Center, University of Wisconsin–Madison, Madison, WI United States of America
- Genome Center of Wisconsin, University of Wisconsin–Madison, Madison, WI United States of America
- Laboratory of Genetics, University of Wisconsin–Madison, Madison, WI United States of America
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152
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Tafer H, Poyntner C, Lopandic K, Sterflinger K, Piñar G. Back to the Salt Mines: Genome and Transcriptome Comparisons of the Halophilic Fungus Aspergillus salisburgensis and Its Halotolerant Relative Aspergillus sclerotialis. Genes (Basel) 2019; 10:E381. [PMID: 31137536 PMCID: PMC6563132 DOI: 10.3390/genes10050381] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 05/15/2019] [Accepted: 05/15/2019] [Indexed: 12/22/2022] Open
Abstract
Salt mines are among the most extreme environments as they combine darkness, low nutrient availability, and hypersaline conditions. Based on comparative genomics and transcriptomics, we describe in this work the adaptive strategies of the true halophilic fungus Aspergillus salisburgensis, found in a salt mine in Austria, and compare this strain to the ex-type halotolerant fungal strain Aspergillus sclerotialis. On a genomic level, A. salisburgensis exhibits a reduced genome size compared to A. sclerotialis, as well as a contraction of genes involved in transport processes. The proteome of A. sclerotialis exhibits an increased proportion of alanine, glycine, and proline compared to the proteome of non-halophilic species. Transcriptome analyses of both strains growing at 5% and 20% NaCl show that A. salisburgensis regulates three-times fewer genes than A. sclerotialis in order to adapt to the higher salt concentration. In A. sclerotialis, the increased osmotic stress impacted processes related to translation, transcription, transport, and energy. In contrast, membrane-related and lignolytic proteins were significantly affected in A. salisburgensis.
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Affiliation(s)
- Hakim Tafer
- VIBT EQ Extremophile Center, Department of Biotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria.
| | - Caroline Poyntner
- VIBT EQ Extremophile Center, Department of Biotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria.
| | - Ksenija Lopandic
- VIBT EQ Extremophile Center, Department of Biotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria.
| | - Katja Sterflinger
- VIBT EQ Extremophile Center, Department of Biotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria.
| | - Guadalupe Piñar
- VIBT EQ Extremophile Center, Department of Biotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria.
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153
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Li X, Wang F, Liu Q, Li Q, Qian Z, Zhang X, Li K, Li W, Dong C. Developmental transcriptomics of Chinese cordyceps reveals gene regulatory network and expression profiles of sexual development-related genes. BMC Genomics 2019; 20:337. [PMID: 31054562 PMCID: PMC6500587 DOI: 10.1186/s12864-019-5708-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 04/17/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Chinese cordyceps, also known as Chinese caterpillar fungus (Ophiocordyceps sinensis, syn. Cordyceps sinensis), is of particular interest for its cryptic life cycle and economic and ecological importance. The large-scale artificial cultivation was succeeded recently after several decades of efforts and attempts. However, the induction of primordium, sexual development of O. sinensis and the molecular basis of its lifestyle still remain cryptic. RESULTS The developmental transcriptomes were analyzed for six stages covering the whole developmental process, including hyphae (HY), sclerotium (ST), primordium (PR), young fruiting body (YF), developed fruiting body (DF) and mature fruiting body (MF), with a focus on the expression of sexual development-related genes. Principal component analysis revealed that the gene expression profiles at the stages of primordium formation and fruiting body development are more similar than those of the undifferentiated HY stage. The PR and MF stages grouped together, suggesting that primordium differentiation and sexual maturation have similar expression patterns. Many more DEGs were identified between the ST and HY stages, covering 47.5% of the O. sinensis genome, followed by the comparisons between the ST and PR stages. Using pairwise comparisons and weighted gene coexpression network analysis, modules of coexpressed genes and candidate hub genes for each developmental stage were identified. The four mating type loci genes expressed during primordium differentiation and sexual maturation; however, spatiotemporal specificity of gene expression indicated that they also expressed during the anamorphic HY stage. The four mating type genes were not coordinately expressed, suggesting they may have divergent roles. The expression of the four mating type genes was highest in the fertile part and lowest in the sclerotium of the MF stage, indicating that there is tissue specificity. Half of genes related to mating signaling showed as the highest expression in the ST stage, indicating fruiting was initiated in the ST stage. CONCLUSIONS These results provide a new perspective to understanding of the key pathways and hub genes, and sexual development-related gene profile in the development of Chinese cordyceps. It will be helpful for underlying sexual reproduction, and add new information to existing models of fruiting body development in edible fungi.
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Affiliation(s)
- Xiao Li
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, NO. 3 Park 1, Beichen West Road, Chaoyang District, Beijing, 100101 China
- University of Chinese Academy of Sciences, Beijing, 100039 China
| | - Fen Wang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, NO. 3 Park 1, Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Qing Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, NO. 3 Park 1, Beichen West Road, Chaoyang District, Beijing, 100101 China
- University of Chinese Academy of Sciences, Beijing, 100039 China
| | - Quanping Li
- Key Laboratory of State Administration of Traditional Chinese Medicine, Sunshine Lake Pharma Co., LTD, Dongguan, 523850 Guangdong China
| | - Zhengming Qian
- Key Laboratory of State Administration of Traditional Chinese Medicine, Sunshine Lake Pharma Co., LTD, Dongguan, 523850 Guangdong China
| | - Xiaoling Zhang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, NO. 3 Park 1, Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Kuan Li
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, NO. 3 Park 1, Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Wenjia Li
- Key Laboratory of State Administration of Traditional Chinese Medicine, Sunshine Lake Pharma Co., LTD, Dongguan, 523850 Guangdong China
| | - Caihong Dong
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, NO. 3 Park 1, Beichen West Road, Chaoyang District, Beijing, 100101 China
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154
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Guerra-Moreno A, Ang J, Welsch H, Jochem M, Hanna J. Regulation of the unfolded protein response in yeast by oxidative stress. FEBS Lett 2019; 593:1080-1088. [PMID: 31002390 DOI: 10.1002/1873-3468.13389] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 12/11/2022]
Abstract
In the unfolded protein response (UPR), Ire1 activates Hac1 to coordinate the transcription of hundreds of genes to mitigate ER stress. Recent work in Caenorhabditis elegans suggests that oxidative stress inhibits this canonical Ire1 signalling pathway, activating instead an antioxidant stress response. We sought to determine whether this novel mode of UPR function also existed in yeast, where Ire1 has been best characterized. We show that the yeast UPR is also subject to inhibition by oxidative stress. Inhibition is mediated by a single evolutionarily conserved cysteine, and affects both luminal and membrane pathways of Ire1 activation. In yeast, Ire1 appears dispensable for resistance to oxidative stress and, therefore, the physiological significance of this pathway remains to be demonstrated.
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Affiliation(s)
- Angel Guerra-Moreno
- Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Jessie Ang
- Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Hendrik Welsch
- Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Marco Jochem
- Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - John Hanna
- Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
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155
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Banerjee S, Clapp K, Tarsio M, Kane PM. Interaction of the late endo-lysosomal lipid PI(3,5)P2 with the Vph1 isoform of yeast V-ATPase increases its activity and cellular stress tolerance. J Biol Chem 2019; 294:9161-9171. [PMID: 31023825 DOI: 10.1074/jbc.ra119.008552] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 04/22/2019] [Indexed: 12/30/2022] Open
Abstract
The low-level endo-lysosomal signaling lipid, phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2), is required for full assembly and activity of vacuolar H+-ATPases (V-ATPases) containing the vacuolar a-subunit isoform Vph1 in yeast. The cytosolic N-terminal domain of Vph1 is also recruited to membranes in vivo in a PI(3,5)P2-dependent manner, but it is not known if its interaction with PI(3,5)P2 is direct. Here, using biochemical characterization of isolated yeast vacuolar vesicles, we demonstrate that addition of exogenous short-chain PI(3,5)P2 to Vph1-containing vacuolar vesicles activates V-ATPase activity and proton pumping. Modeling of the cytosolic N-terminal domain of Vph1 identified two membrane-oriented sequences that contain clustered basic amino acids. Substitutions in one of these sequences (231KTREYKHK) abolished the PI(3,5)P2-dependent activation of V-ATPase without affecting basal V-ATPase activity. We also observed that vph1 mutants lacking PI(3,5)P2 activation have enlarged vacuoles relative to those in WT cells. These mutants exhibit a significant synthetic growth defect when combined with deletion of Hog1, a kinase important for signaling the transcriptional response to osmotic stress. The results suggest that PI(3,5)P2 interacts directly with Vph1, and that this interaction both activates V-ATPase activity and protects cells from stress.
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Affiliation(s)
- Subhrajit Banerjee
- From the Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, New York 13210
| | - Kaitlyn Clapp
- From the Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, New York 13210
| | - Maureen Tarsio
- From the Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, New York 13210
| | - Patricia M Kane
- From the Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, New York 13210
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156
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Osmolyte accumulation regulates the SUMOylation and inclusion dynamics of the prionogenic Cyc8-Tup1 transcription corepressor. PLoS Genet 2019; 15:e1008115. [PMID: 31009461 PMCID: PMC6497323 DOI: 10.1371/journal.pgen.1008115] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 05/02/2019] [Accepted: 03/29/2019] [Indexed: 01/08/2023] Open
Abstract
Environmental stressors can severely perturb cellular homeostasis and compromise viability. To cope with environmental stressors, eukaryotes have developed distinct signaling programs that allow for adaptation during different stress conditions. These programs often require a host of post-translational modifications that alter proteins to elicit appropriate cellular responses. One crucial protein modifier during stress is the small ubiquitin-like modifier SUMO. In many cases, however, the functions of stress dependent protein SUMOylation remain unclear. Previously, we showed that the conserved Saccharomyces cerevisiae Cyc8-Tup1 transcriptional corepressor complex undergoes transient hyperosmotic stress-induced SUMOylation and inclusion formation, which are important for appropriate regulation of hyperosmotic-stress genes. Here, we show the osmostress-responsive MAP kinase Hog1 regulates Cyc8 SUMOylation and inclusion formation via its role in the transcriptional activation of glycerol biosynthesis genes. Mutations that ablate Cyc8 SUMOylation can partially rescue the osmosensitivity of hog1Δ cells, and this is facilitated by inappropriate derepression of glycerol-biosynthesis genes. Furthermore, cells specifically unable to synthesize the osmolyte glycerol cause transient Cyc8 SUMOylation and inclusions to persist, indicating a regulatory role for glycerol to reestablish the basal state of Cyc8 following adaptation to hyperosmotic stress. These observations unveil a novel intersection between phosphorylation and SUMOylation networks, which are critical for shifting gene expression and metabolic programs during stress adaptation. The ability to sense and react to diverse environmental cues is a central aspect in the maintenance of cellular homeostasis. In response to harsh conditions, cells must rapidly deploy specific stress responses in order to adapt, survive, and proliferate. To ensure optimal spatial and temporal control over stress responses, many proteins undergo biophysical and biochemical alterations. More specifically, these alterations include conformational changes and post-translational modifications–such as phosphorylation, ubiquitination, and SUMOylation–that alter the function, localization, and interactome of target proteins. In this study, we show that the Hog1 MAPK regulates SUMOylation and biomolecular condensation of the yeast transcription corepressor complex Cyc8-Tup1 during exposure to hyperosmotic stress. In turn, this signaling relationship functions to effectively rewire yeast metabolism toward the biosynthesis of the compatible osmolyte glycerol, which serves as the ultimate signal to reset this genetic circuit.
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157
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Takahashi N, Ogita N, Takahashi T, Taniguchi S, Tanaka M, Seki M, Umeda M. A regulatory module controlling stress-induced cell cycle arrest in Arabidopsis. eLife 2019; 8:43944. [PMID: 30944065 PMCID: PMC6449083 DOI: 10.7554/elife.43944] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 03/10/2019] [Indexed: 11/13/2022] Open
Abstract
Cell cycle arrest is an active response to stresses that enables organisms to survive under fluctuating environmental conditions. While signalling pathways that inhibit cell cycle progression have been elucidated, the putative core module orchestrating cell cycle arrest in response to various stresses is still elusive. Here we report that in Arabidopsis, the NAC-type transcription factors ANAC044 and ANAC085 are required for DNA damage-induced G2 arrest. Under genotoxic stress conditions, ANAC044 and ANAC085 enhance protein accumulation of the R1R2R3-type Myb transcription factor (Rep-MYB), which represses G2/M-specific genes. ANAC044/ANAC085-dependent accumulation of Rep-MYB and cell cycle arrest are also observed in the response to heat stress that causes G2 arrest, but not to osmotic stress that retards G1 progression. These results suggest that plants deploy the ANAC044/ANAC085-mediated signalling module as a hub which perceives distinct stress signals and leads to G2 arrest. During environmental stresses, such as high light or a drought, plants do not have the opportunity to up and leave. Instead, they need to buy time and energy by pausing their growth, which means stopping their cells from dividing. In this case, the cell cycle, a series of stages during which a cell prepares itself for division, must be halted. If the genetic information in cells is damaged, often under the influence of the environment, plants stop their cell cycle in the step just before division. However, it is still unclear how this process takes place, and which proteins participate in it. Researchers also do not know whether environmental stresses can directly trigger this mechanism. To investigate, Takahashi et al. conducted a series of genetic experiments on a common plant known as Arabidopsis thaliana, and they identified two proteins, ANAC044 and ANAC085, which could stop the cell cycle when the genetic information is damaged. In particular, ANAC044 and ANAC085 worked by stabilizing other proteins that turn off certain genes that the cell needed to divide. Additional experiments showed that other types of stresses, such as heat, halted the cell cycle using the ANAC044 and ANAC085 pathway. This suggests that this mechanism may be a central ‘hub’ that responds to various stress signals from the environment to prevent cells from dividing. In the field, environmental stresses stop plants from growing, which reduces crop yields; ultimately, manipulating ANAC044 or ANAC085 might help to boost plant productivity even when external conditions fluctuate.
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Affiliation(s)
- Naoki Takahashi
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara, Japan
| | - Nobuo Ogita
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara, Japan
| | - Tomonobu Takahashi
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara, Japan
| | - Shoji Taniguchi
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara, Japan
| | - Maho Tanaka
- RIKEN Center for Sustainable Resource Science, Yokohama, Japan.,RIKEN Cluster for Pioneering Research, Wako, Japan
| | - Motoaki Seki
- RIKEN Cluster for Pioneering Research, Wako, Japan
| | - Masaaki Umeda
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara, Japan
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158
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Folz H, Niño CA, Taranum S, Caesar S, Latta L, Waharte F, Salamero J, Schlenstedt G, Dargemont C. SUMOylation of the nuclear pore complex basket is involved in sensing cellular stresses. J Cell Sci 2019; 132:jcs.224279. [PMID: 30837289 PMCID: PMC6467484 DOI: 10.1242/jcs.224279] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 02/22/2019] [Indexed: 01/02/2023] Open
Abstract
The nuclear pore complex (NPC) is the major conduit for nucleocytoplasmic transport and serves as a platform for gene regulation and DNA repair. Several nucleoporins undergo ubiquitylation and SUMOylation, and these modifications play an important role in nuclear pore dynamics and plasticity. Here, we perform a detailed analysis of these post-translational modifications of yeast nuclear basket proteins under normal growth conditions as well as upon cellular stresses, with a focus on SUMOylation. We find that the balance between the dynamics of SUMOylation and deSUMOylation of Nup60 and Nup2 at the NPC differs substantially, particularly in G1 and S phase. While Nup60 is the unique target of genotoxic stress within the nuclear basket that probably belongs to the SUMO-mediated DNA damage response pathway, both Nup2 and Nup60 show a dramatic increase in SUMOylation upon osmotic stress, with Nup2 SUMOylation being enhanced in Nup60 SUMO-deficient mutant yeast strains. Taken together, our data reveal that there are several levels of crosstalk between nucleoporins, and that the post-translational modifications of the NPC serve in sensing cellular stress signals. Summary: Post-translational modifications, and in particular SUMOylation, of the nuclear basket subcomplex of the nuclear pore complex serve in its function as a sensor for mediating cellular stress signals.
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Affiliation(s)
- Hanne Folz
- Institute of Medical Biochemistry and Molecular Biology, Universität des Saarlandes, D-66421 Homburg, Germany
| | - Carlos A Niño
- Université Paris Diderot, Sorbonne Paris Cité, Pathologie et Virologie Moléculaire, INSERM, CNRS, Hôpital St. Louis, 75475 Paris, France
| | - Surayya Taranum
- Université Paris Diderot, Sorbonne Paris Cité, Pathologie et Virologie Moléculaire, INSERM, CNRS, Hôpital St. Louis, 75475 Paris, France
| | - Stefanie Caesar
- Institute of Medical Biochemistry and Molecular Biology, Universität des Saarlandes, D-66421 Homburg, Germany
| | - Lorenz Latta
- Institute of Medical Biochemistry and Molecular Biology, Universität des Saarlandes, D-66421 Homburg, Germany
| | - François Waharte
- Institut Curie, PSL Research University, CNRS UMR 144, UPMC, Space-time Imaging of Organelles and Endomembranes Dynamics & PICT-IBiSA Imaging Core Facility, 75005 Paris, France
| | - Jean Salamero
- Institut Curie, PSL Research University, CNRS UMR 144, UPMC, Space-time Imaging of Organelles and Endomembranes Dynamics & PICT-IBiSA Imaging Core Facility, 75005 Paris, France
| | - Gabriel Schlenstedt
- Institute of Medical Biochemistry and Molecular Biology, Universität des Saarlandes, D-66421 Homburg, Germany
| | - Catherine Dargemont
- Université Paris Diderot, Sorbonne Paris Cité, Pathologie et Virologie Moléculaire, INSERM, CNRS, Hôpital St. Louis, 75475 Paris, France
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159
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Dose dependent gene expression is dynamically modulated by the history, physiology and age of yeast cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2019; 1862:457-471. [DOI: 10.1016/j.bbagrm.2019.02.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 02/21/2019] [Accepted: 02/23/2019] [Indexed: 12/14/2022]
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160
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Hyperosmotic Stress Initiates AMPK-Independent Autophagy and AMPK- and Autophagy-Independent Depletion of Thioredoxin 1 and Glyoxalase 2 in HT22 Nerve Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:2715810. [PMID: 31049129 PMCID: PMC6458930 DOI: 10.1155/2019/2715810] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 12/14/2018] [Accepted: 12/24/2018] [Indexed: 02/07/2023]
Abstract
Background Hyperosmotic stress is an important pathophysiologic condition in diabetes, severe trauma, dehydration, infection, and ischemia. Furthermore, brain neuronal cells face hyperosmotic stress in ageing and Alzheimer's disease. Despite the enormous importance of knowing the homeostatic mechanisms underlying the responses of nerve cells to hyperosmotic stress, this topic has been underrepresented in the literature. Recent evidence points to autophagy induction as a hallmark of hyperosmotic stress, which has been proposed to be controlled by mTOR inhibition as a consequence of AMPK activation. We previously showed that methylglyoxal induced a decrease in the antioxidant proteins thioredoxin 1 (Trx1) and glyoxalase 2 (Glo2), which was mediated by AMPK-dependent autophagy. Thus, we hypothesized that hyperosmotic stress would have the same effect. Methods HT22 hippocampal nerve cells were treated with NaCl (37, 75, or 150 mM), and the activation of the AMPK/mTOR pathway was investigated, as well as the levels of Trx1 and Glo2. To determine if autophagy was involved, the inhibitors bafilomycin (Baf) and chloroquine (CQ), as well as ATG5 siRNA, were used. To test for AMPK involvement, AMPK-deficient mouse embryonic fibroblasts (MEFs) were used. Results Hyperosmotic stress induced a clear increase in autophagy, which was demonstrated by a decrease in p62 and an increase in LC3 lipidation. AMPK phosphorylation, linked to a decrease in mTOR and S6 ribosomal protein phosphorylation, was also observed. Deletion of AMPK in MEFs did not prevent autophagy induction by hyperosmotic stress, as detected by decreased p62 and increased LC3 II, or mTOR inhibition, inferred by decreased phosphorylation of P70 S6 kinase and S6 ribosomal protein. These data indicating that AMPK was not involved in autophagy activation by hyperosmotic stress were supported by a decrease in pS555-ULK1, an AMPK phosphorylation site. Trx1 and Glo2 levels were decreased at 6 and 18 h after treatment with 150 mM NaCl. However, this decrease in Trx1 and Glo2 in HT22 cells was not prevented by autophagy inhibition by Baf, CQ, or ATG5 siRNA. AMPK-deficient MEFs under hyperosmotic stress presented the same Trx1 and Glo2 decrease as wild-type cells. Conclusion Hyperosmotic stress induced AMPK activation, but this was not responsible for its effects on mTOR activity or autophagy induction. Moreover, the decrease in Trx1 and Glo2 induced by hyperosmotic stress was independent of both autophagy and AMPK activation.
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161
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Sellam A, Chaillot J, Mallick J, Tebbji F, Richard Albert J, Cook MA, Tyers M. The p38/HOG stress-activated protein kinase network couples growth to division in Candida albicans. PLoS Genet 2019; 15:e1008052. [PMID: 30921326 PMCID: PMC6456229 DOI: 10.1371/journal.pgen.1008052] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 04/09/2019] [Accepted: 02/28/2019] [Indexed: 12/26/2022] Open
Abstract
Cell size is a complex trait that responds to developmental and environmental cues. Quantitative size analysis of mutant strain collections disrupted for protein kinases and transcriptional regulators in the pathogenic yeast Candida albicans uncovered 66 genes that altered cell size, few of which overlapped with known size genes in the budding yeast Saccharomyces cerevisiae. A potent size regulator specific to C. albicans was the conserved p38/HOG MAPK module that mediates the osmostress response. Basal HOG activity inhibited the SBF G1/S transcription factor complex in a stress-independent fashion to delay the G1/S transition. The HOG network also governed ribosome biogenesis through the master transcriptional regulator Sfp1. Hog1 bound to the promoters and cognate transcription factors for ribosome biogenesis regulons and interacted genetically with the SBF G1/S machinery, and thereby directly linked cell growth and division. These results illuminate the evolutionary plasticity of size control and identify the HOG module as a nexus of cell cycle and growth regulation.
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Affiliation(s)
- Adnane Sellam
- Infectious Diseases Research Centre (CRI), CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
- Department of Microbiology, Infectious Disease and Immunology, Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Julien Chaillot
- Infectious Diseases Research Centre (CRI), CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
| | - Jaideep Mallick
- Institute for Research in Immunology and Cancer (IRIC), Department of Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Faiza Tebbji
- Infectious Diseases Research Centre (CRI), CHU de Québec Research Center (CHUQ), Université Laval, Quebec City, QC, Canada
| | - Julien Richard Albert
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Michael A. Cook
- Centre for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Mike Tyers
- Institute for Research in Immunology and Cancer (IRIC), Department of Medicine, Université de Montréal, Montréal, Québec, Canada
- Centre for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
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162
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Takayama T, Yamamoto K, Saito H, Tatebayashi K. Interaction between the transmembrane domains of Sho1 and Opy2 enhances the signaling efficiency of the Hog1 MAP kinase cascade in Saccharomyces cerevisiae. PLoS One 2019; 14:e0211380. [PMID: 30682143 PMCID: PMC6347418 DOI: 10.1371/journal.pone.0211380] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 01/12/2019] [Indexed: 12/23/2022] Open
Abstract
To cope with increased extracellular osmolarity, the budding yeast Saccharomyces cerevisiae activates the Hog1 mitogen-activated protein kinase (MAPK), which controls a variety of adaptive responses. Hog1 is activated through the high-osmolarity glycerol (HOG) pathway, which consists of a core MAPK cascade and two independent upstream branches (SHO1 and SLN1 branches) containing distinct osmosensing machineries. In the SHO1 branch, a homo-oligomer of Sho1, the four-transmembrane (TM) osmosensor, interacts with the transmembrane co-osmosensors, Hkr1 and Msb2, and the membrane anchor protein Opy2, through their TM domains, and activates the Ste20-Ste11-Pbs2-Hog1 kinase cascade. In this study, we isolated and analyzed hyperactive mutants of Sho1 and Opy2 that harbor mutations within their TM domains. Several hyperactive mutations enhanced the interaction between Sho1 and Opy2, indicating the importance of the TM-mediated interaction between Sho1 and Opy2 for facilitating effective signaling. The interaction between the TM domains of Sho1 and Opy2 will place their respective cytoplasmic binding partners Pbs2 and Ste11 in close proximity. Indeed, genetic analyses of the mutants showed that the Sho1-Opy2 interaction enhances the activation of Pbs2 by Ste11, but not Hog1 by Pbs2. Some of the hyperactive mutants had mutations at the extracellular ends of either Sho1 TM4 or Opy2 TM, and defined the Sho1-Opy2 binding site 1 (BS1). Chemical crosslinking and mutational analyses revealed that the cytoplasmic ends of Sho1 TM1 and Opy2 TM also interact with each other, defining the Sho1-Opy2 binding site 2 (BS2). A geometric consideration constrains that one Opy2 molecule must interact with two adjacent Sho1 molecules in Sho1 oligomer. These results raise a possibility that an alteration of the conformation of the Sho1-Opy2 complex might contributes to the osmotic activation of the Hog1 MAPK cascade.
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Affiliation(s)
- Tomomi Takayama
- Division of Molecular Cell Signaling, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Katsuyoshi Yamamoto
- Division of Molecular Cell Signaling, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Haruo Saito
- Division of Molecular Cell Signaling, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Kazuo Tatebayashi
- Division of Molecular Cell Signaling, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Laboratory of Molecular Genetics, Frontier Research Unit, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
- * E-mail:
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163
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Kennedy EN, Hebdon SD, Menon SK, Foster CA, Copeland DM, Xu Q, Janiak-Spens F, West AH. Role of the highly conserved G68 residue in the yeast phosphorelay protein Ypd1: implications for interactions between histidine phosphotransfer (HPt) and response regulator proteins. BMC BIOCHEMISTRY 2019; 20:1. [PMID: 30665347 PMCID: PMC6341664 DOI: 10.1186/s12858-019-0104-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 01/07/2019] [Indexed: 11/29/2022]
Abstract
Background Many bacteria and certain eukaryotes utilize multi-step His-to-Asp phosphorelays for adaptive responses to their extracellular environments. Histidine phosphotransfer (HPt) proteins function as key components of these pathways. HPt proteins are genetically diverse, but share a common tertiary fold with conserved residues near the active site. A surface-exposed glycine at the H + 4 position relative to the phosphorylatable histidine is found in a significant number of annotated HPt protein sequences. Previous reports demonstrated that substitutions at this position result in diminished phosphotransfer activity between HPt proteins and their cognate signaling partners. Results We report the analysis of partner binding interactions and phosphotransfer activity of the prototypical HPt protein Ypd1 from Saccharomyces cerevisiae using a set of H + 4 (G68) substituted proteins. Substitutions at this position with large, hydrophobic, or charged amino acids nearly abolished phospho-acceptance from the receiver domain of its upstream signaling partner, Sln1 (Sln1-R1). An in vitro binding assay indicated that G68 substitutions caused only modest decreases in affinity between Ypd1 and Sln1-R1, and these differences did not appear to be large enough to account for the observed decrease in phosphotransfer activity. The crystal structure of one of these H + 4 mutants, Ypd1-G68Q, which exhibited a diminished ability to participate in phosphotransfer, shows a similar overall structure to that of wild-type. Molecular modelling suggests that the highly conserved active site residues within the receiver domain of Sln1 must undergo rearrangement to accommodate larger H + 4 substitutions in Ypd1. Conclusions Phosphotransfer reactions require precise arrangement of active site elements to align the donor-acceptor atoms and stabilize the transition state during the reaction. Any changes likely result in an inability to form a viable transition state during phosphotransfer. Our data suggest that the high degree of evolutionary conservation of residues with small side chains at the H + 4 position in HPt proteins is required for optimal activity and that the presence of larger residues at the H + 4 position would cause alterations in the positioning of active site residues in the partner response regulator. Electronic supplementary material The online version of this article (10.1186/s12858-019-0104-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Emily N Kennedy
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA.,Present Address: University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Skyler D Hebdon
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA
| | - Smita K Menon
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA
| | - Clay A Foster
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA.,Present Address: University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Daniel M Copeland
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA.,Present Address: Pacira Pharmaceuticals, San Diego, CA, 92121, USA
| | - Qingping Xu
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA.,Present Address: GMCA at Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Fabiola Janiak-Spens
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA
| | - Ann H West
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA.
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164
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Swamy KBS, Zhou N. Experimental evolution: its principles and applications in developing stress-tolerant yeasts. Appl Microbiol Biotechnol 2019; 103:2067-2077. [PMID: 30659332 DOI: 10.1007/s00253-019-09616-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 01/03/2019] [Accepted: 01/03/2019] [Indexed: 10/27/2022]
Abstract
Stress tolerance and resistance in industrial yeast strains are important attributes for cost-effective bioprocessing. The source of stress-tolerant yeasts ranges from extremophilic environments to laboratory engineered strains. However, industrial stress-tolerant yeasts are very rare in nature as the natural environment forces them to evolve traits that optimize survival and reproduction and not the ability to withstand harsh habitat-irrelevant industrial conditions. Experimental evolution is a frequent method used to uncover the mechanisms of evolution and microbial adaption towards environmental stresses. It optimizes biological systems by means of adaptation to environmental stresses and thus has immense power of development of robust stress-tolerant yeasts. This mini-review briefly outlines the basics and implications of evolution experiments and their applications to industrial biotechnology. This work is meant to serve as an introduction to those new to the field of experimental evolution, and as a guide to biologists working in the field of yeast stress response. Future perspectives of experimental evolution for potential biotechnological applications have also been elucidated.
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Affiliation(s)
| | - Nerve Zhou
- Department of Biological Sciences and Biotechnology, Botswana International University of Science and Technology, P Bag 16, Palapye, Botswana
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165
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Mechanisms of Yeast Adaptation to Wine Fermentations. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2019; 58:37-59. [PMID: 30911888 DOI: 10.1007/978-3-030-13035-0_2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Cells face genetic and/or environmental changes in order to outlast and proliferate. Characterization of changes after stress at different "omics" levels is crucial to understand the adaptation of yeast to changing conditions. Wine fermentation is a stressful situation which yeast cells have to cope with. Genome-wide analyses extend our cellular physiology knowledge by pointing out the mechanisms that contribute to sense the stress caused by these perturbations (temperature, ethanol, sulfites, nitrogen, etc.) and related signaling pathways. The model organism, Saccharomyces cerevisiae, was studied in response to industrial stresses and changes at different cellular levels (transcriptomic, proteomic, and metabolomics), which were followed statically and/or dynamically in the short and long terms. This chapter focuses on the response of yeast cells to the diverse stress situations that occur during wine fermentations, which induce perturbations, including nutritional changes, ethanol stress, temperature stress, oxidative stress, etc.
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166
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de Assis LJ, Manfiolli A, Mattos E, Fabri JHTM, Malavazi I, Jacobsen ID, Brock M, Cramer RA, Thammahong A, Hagiwara D, Ries LNA, Goldman GH. Protein Kinase A and High-Osmolarity Glycerol Response Pathways Cooperatively Control Cell Wall Carbohydrate Mobilization in Aspergillus fumigatus. mBio 2018; 9:e01952-18. [PMID: 30538182 PMCID: PMC6299480 DOI: 10.1128/mbio.01952-18] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 11/06/2018] [Indexed: 02/07/2023] Open
Abstract
Aspergillus fumigatus mitogen-activated protein kinases (MAPKs) are involved in maintaining the normal morphology of the cell wall and providing resistance against cell wall-damaging agents. Upon cell wall stress, cell wall-related sugars need to be synthesized from carbohydrate storage compounds. Here we show that this process is dependent on cAMP-dependent protein kinase A (PKA) activity and regulated by the high-osmolarity glycerol response (HOG) MAPKs SakA and MpkC. These protein kinases are necessary for normal accumulation/degradation of trehalose and glycogen, and the lack of these genes reduces glucose uptake and glycogen synthesis. Alterations in glycogen synthesis were observed for the sakA and mpkC deletion mutants, which also displayed alterations in carbohydrate exposure on the cell wall. Carbohydrate mobilization is controlled by SakA interaction with PkaC1 and PkaR, suggesting a putative mechanism where the PkaR regulatory subunit leaves the complex and releases the SakA-PkaC1 complex for activation of enzymes involved in carbohydrate mobilization. This work reveals the communication between the HOG and PKA pathways for carbohydrate mobilization for cell wall construction.IMPORTANCEAspergillus fumigatus is an opportunistic human pathogen causing allergic reactions or systemic infections such as invasive pulmonary aspergillosis, especially in immunocompromised patients. The fungal cell wall is the main component responsible for recognition by the immune system, due to the specific composition of polysaccharide carbohydrates exposed on the surface of the fungal cell wall called pathogen-associated molecular patterns (PAMPs). Key enzymes in the fungal cell wall biosynthesis are a good target for fungal drug development. This report elucidates the cooperation between the HOG and PKA pathways in the mobilization of carbohydrates for fungal cell wall biosynthesis. We suggest that the reduced mobilization of simple sugars causes defects in the structure of the fungal cell wall. In summary, we propose that SakA is important for PKA activity, therefore regulating the availability and mobilization of monosaccharides for fungal cell wall biosynthesis during cell wall damage and the osmotic stress response.
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Affiliation(s)
- Leandro José de Assis
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Adriana Manfiolli
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Eliciane Mattos
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - João H T Marilhano Fabri
- Departamento de Genética e Evolução, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, São Paulo, Brazil
| | - Iran Malavazi
- Departamento de Genética e Evolução, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, São Paulo, Brazil
| | - Ilse D Jacobsen
- Research Group Microbial Immunology, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knoell Institute, Jena, Germany
| | - Matthias Brock
- Fungal Genetics and Biology Group, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom
| | - Robert A Cramer
- Geisel School of Medicine at Dartmouth, Department of Microbiology and Immunology, Hanover, New Hampshire, USA
| | - Arsa Thammahong
- Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Daisuke Hagiwara
- Faculty of Life and Environmental Sciences, University of Tsukuba, Ibaraki, Japan
| | | | - Gustavo Henrique Goldman
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
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167
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Beyer R, Jandric Z, Zutz C, Gregori C, Willinger B, Jacobsen ID, Kovarik P, Strauss J, Schüller C. Competition of Candida glabrata against Lactobacillus is Hog1 dependent. Cell Microbiol 2018; 20:e12943. [PMID: 30112857 PMCID: PMC6283251 DOI: 10.1111/cmi.12943] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 07/04/2018] [Accepted: 08/07/2018] [Indexed: 12/30/2022]
Abstract
Candida glabrata is a common human fungal commensal and opportunistic pathogen. This fungus shows remarkable resilience as it can form recalcitrant biofilms on indwelling catheters, has intrinsic resistance against azole antifungals, and is causing vulvovaginal candidiasis. As a nosocomial pathogen, it can cause life-threatening bloodstream infections in immune-compromised patients. Here, we investigate the potential role of the high osmolarity glycerol response (HOG) MAP kinase pathway for C. glabrata virulence. The C. glabrata MAP kinase CgHog1 becomes activated by a variety of environmental stress conditions such as osmotic stress, low pH, and carboxylic acids and subsequently accumulates in the nucleus. We found that CgHog1 allows C. glabrata to persist within murine macrophages, but it is not required for systemic infection in a mouse model. C. glabrata and Lactobacilli co-colonise mucosal surfaces. Lactic acid at a concentration produced by vaginal Lactobacillus spp. causes CgHog1 phosphorylation and accumulation in the nucleus. In addition, CgHog1 enables C. glabrata to tolerate different Lactobacillus spp. and their metabolites when grown in co-culture. Using a phenotypic diverse set of clinical C. glabrata isolates, we find that the HOG pathway is likely the main quantitative determinant of lactic acid stress resistance. Taken together, our data indicate that CgHog1 has an important role in the confrontation of C. glabrata with the common vaginal flora.
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Affiliation(s)
- Reinhard Beyer
- Department of Applied Genetics and Cell Biology (DAGZ)University of Natural Resources and Life Sciences, Vienna (BOKU)TullnAustria
| | - Zeljkica Jandric
- Department of Applied Genetics and Cell Biology (DAGZ)University of Natural Resources and Life Sciences, Vienna (BOKU)TullnAustria
| | - Christoph Zutz
- Department of Farm Animal and Veterinary Public HealthInstitute of Milk Hygiene, Milk Technology and Food ScienceViennaAustria
- Platform Bioactive Microbial Metabolites (BiMM)
| | - Christa Gregori
- Department of Applied Genetics and Cell Biology (DAGZ)University of Natural Resources and Life Sciences, Vienna (BOKU)TullnAustria
| | - Birgit Willinger
- Division of Clinical Microbiology, Department of Laboratory MedicineMedical University of ViennaViennaAustria
| | - Ilse D. Jacobsen
- Research Group Microbial Immunology, Leibniz Institute for Natural Product Research and Infection BiologyHans‐Knöll‐Institute (HKI)JenaGermany
| | - Pavel Kovarik
- Max F. Perutz LaboratoriesUniversity of Vienna, Vienna Biocenter (VBC)ViennaAustria
| | - Joseph Strauss
- Department of Applied Genetics and Cell Biology (DAGZ)University of Natural Resources and Life Sciences, Vienna (BOKU)TullnAustria
- Platform Bioactive Microbial Metabolites (BiMM)
| | - Christoph Schüller
- Department of Applied Genetics and Cell Biology (DAGZ)University of Natural Resources and Life Sciences, Vienna (BOKU)TullnAustria
- Platform Bioactive Microbial Metabolites (BiMM)
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168
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Leskoske KL, Roelants FM, Emmerstorfer-Augustin A, Augustin CM, Si EP, Hill JM, Thorner J. Phosphorylation by the stress-activated MAPK Slt2 down-regulates the yeast TOR complex 2. Genes Dev 2018; 32:1576-1590. [PMID: 30478248 PMCID: PMC6295167 DOI: 10.1101/gad.318709.118] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 10/10/2018] [Indexed: 12/13/2022]
Abstract
Here, Leskoske et al. studied how TORC2 activity is modulated in response to changes in the status of the cell envelope. They demonstrate that TORC2 subunit Avo2 is a direct target of Slt2, the MAPK of the cell wall integrity pathway, and their findings provide new insights into TORC2 function and regulation. Saccharomyces cerevisiae target of rapamycin (TOR) complex 2 (TORC2) is an essential regulator of plasma membrane lipid and protein homeostasis. How TORC2 activity is modulated in response to changes in the status of the cell envelope is unclear. Here we document that TORC2 subunit Avo2 is a direct target of Slt2, the mitogen-activated protein kinase (MAPK) of the cell wall integrity pathway. Activation of Slt2 by overexpression of a constitutively active allele of an upstream Slt2 activator (Pkc1) or by auxin-induced degradation of a negative Slt2 regulator (Sln1) caused hyperphosphorylation of Avo2 at its MAPK phosphoacceptor sites in a Slt2-dependent manner and diminished TORC2-mediated phosphorylation of its major downstream effector, protein kinase Ypk1. Deletion of Avo2 or expression of a phosphomimetic Avo2 allele rendered cells sensitive to two stresses (myriocin treatment and elevated exogenous acetic acid) that the cell requires Ypk1 activation by TORC2 to survive. Thus, Avo2 is necessary for optimal TORC2 activity, and Slt2-mediated phosphorylation of Avo2 down-regulates TORC2 signaling. Compared with wild-type Avo2, phosphomimetic Avo2 shows significant displacement from the plasma membrane, suggesting that Slt2 inhibits TORC2 by promoting Avo2 dissociation. Our findings are the first demonstration that TORC2 function is regulated by MAPK-mediated phosphorylation.
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Affiliation(s)
- Kristin L Leskoske
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720, USA
| | - Françoise M Roelants
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720, USA
| | - Anita Emmerstorfer-Augustin
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720, USA
| | - Christoph M Augustin
- Department of Mechanical Engineering, University of California at Berkeley, Berkeley, California 94720, USA
| | - Edward P Si
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720, USA
| | - Jennifer M Hill
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720, USA
| | - Jeremy Thorner
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720, USA
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169
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Lee J, Liu L, Levin DE. Stressing out or stressing in: intracellular pathways for SAPK activation. Curr Genet 2018; 65:417-421. [PMID: 30377756 DOI: 10.1007/s00294-018-0898-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 10/17/2018] [Accepted: 10/20/2018] [Indexed: 01/03/2023]
Abstract
Stress-activated MAP kinases (SAPKs) respond to a wide variety of stressors. In most cases, the pathways through which specific stress signals are transmitted to the SAPKs are not known. Our recent findings have begun to address two important and related questions. First, do various stresses activate a SAPK through common pathways initiated at the cell surface, or through alternative, intracellular inputs? Second, how does an activated SAPK mount a specific response appropriate to the particular stress experienced? Our work has uncovered the mechanisms by which two stresses, arsenite treatment and DNA damage, stimulate the yeast SAPKs Hog1 and Mpk1, respectively. We found that these stresses activate the SAPKs through intracellular inputs that modulate their basal phosphorylation, rather than by activation of the protein kinase cascades known to stimulate them. Both stresses act through targeting, in different ways, the tyrosine-specific or dual-specificity protein phosphatases that normally maintain the SAPKs in a low-activity state. Previous work has demonstrated that basal signal flux through SAPK pathways is important for the sensitivity and dynamic response to external signals. Our work reveals that basal activity of SAPKs is additionally important to allow SAPK activation by intracellular inputs that modulate that activity. Additionally, because different stressors may activate SAPKs by modulation of basal signal through inputs at distinct nodes along the canonical activation pathway, stress-specific SAPK outputs may be controlled, in part, by the specific intracellular mechanisms of their activation. Thus, understanding the intracellular pathways through which various stressors activate SAPKs is likely to provide insight into how they elicit physiologically coherent responses to the specific stress experienced.
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Affiliation(s)
- Jongmin Lee
- Department of Molecular and Cell Biology, Boston University Goldman School of Dental Medicine, Boston, MA, 02118, USA
| | - Li Liu
- Department of Molecular and Cell Biology, Boston University Goldman School of Dental Medicine, Boston, MA, 02118, USA
| | - David E Levin
- Department of Molecular and Cell Biology, Boston University Goldman School of Dental Medicine, Boston, MA, 02118, USA.
- Department of Microbiology, Boston University School of Medicine, Boston, MA, 02118, USA.
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170
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Influence of ylHog1 MAPK kinase on Yarrowia lipolytica stress response and erythritol production. Sci Rep 2018; 8:14735. [PMID: 30283045 PMCID: PMC6170386 DOI: 10.1038/s41598-018-33168-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 09/19/2018] [Indexed: 12/27/2022] Open
Abstract
Erythritol production is a unique response to hyperosmotic stress that is observed in a small group of yeasts, including Yarrowia lipolytica. This study investigated whether this unusual mechanism is regulated by the HOG pathway, well described in Saccharomyces cerevisiae. The gene YALI0E25135g was identified as the Y. lipolytica homologue of HOG1 and was found to be phosphorylated in response to hyperosmotic shock. Deletion of the gene caused a significant decrease in resistance to hyperosmotic stress and negatively affected erythritol production. Interestingly, the deletion strain yl-hog1Δ displayed significant morphological defects, with the cells growing in a filamentous form. Moreover, yl-hog1Δ cells were also resistant to the cell wall damaging agents Congo red and calcofluor white. Collectively, these results indicate that yl-Hog1 is crucial for the cellular response to hyperosmotic stress, plays a role in the induction of erythritol production, and potentially prevents cross-talk with different MAPK signalling pathways in the cell.
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171
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Martins TS, Costa V, Pereira C. Signaling pathways governing iron homeostasis in budding yeast. Mol Microbiol 2018; 109:422-432. [DOI: 10.1111/mmi.14009] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/13/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Telma S. Martins
- I3S-Instituto de Investigação e Inovação em Saúde; Universidade do Porto; Porto Portugal
- IBMC-Instituto de Biologia Molecular e Celular; Universidade do Porto; Porto Portugal
| | - Vítor Costa
- I3S-Instituto de Investigação e Inovação em Saúde; Universidade do Porto; Porto Portugal
- IBMC-Instituto de Biologia Molecular e Celular; Universidade do Porto; Porto Portugal
- Departamento de Biologia Molecular; Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto; Porto Portugal
| | - Clara Pereira
- I3S-Instituto de Investigação e Inovação em Saúde; Universidade do Porto; Porto Portugal
- IBMC-Instituto de Biologia Molecular e Celular; Universidade do Porto; Porto Portugal
- Departamento de Biologia Molecular; Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto; Porto Portugal
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Role of the phosphatase Ptc1 in stress responses mediated by CWI and HOG pathways in Fusarium oxysporum. Fungal Genet Biol 2018; 118:10-20. [DOI: 10.1016/j.fgb.2018.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 04/24/2018] [Accepted: 05/27/2018] [Indexed: 01/09/2023]
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173
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Induction of Ptp2 and Cmp2 protein phosphatases is crucial for the adaptive response to ER stress in Saccharomyces cerevisiae. Sci Rep 2018; 8:13078. [PMID: 30166606 PMCID: PMC6117328 DOI: 10.1038/s41598-018-31413-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 08/20/2018] [Indexed: 11/08/2022] Open
Abstract
Expression control of the protein phosphatase is critically involved in crosstalk and feedback of the cellular signaling. In the budding yeast ER stress response, multiple signaling pathways are activated and play key roles in adaptive reactions. However, it remains unclear how the expression level of the protein phosphatase is modulated during ER stress response. Here, we show that ER stress increases expression of Ptp2 tyrosine phosphatase and Cmp2 calcineurin phosphatase. Upregulation of Ptp2 is due to transcriptional activation mediated by Mpk1 MAP kinase and Rlm1 transcription factor. This induction is important for Ptp2 to effectively downregulate the activity of Hog1 MAP kinase. The budding yeast genome possesses two genes, CMP2 and CNA1, encoding the catalytic subunit of calcineurin phosphatase. CMP2 is more important than CNA1 not only in ER stress response, but also in salt stress response. Higher promoter activity of CMP2 contributes to its relative functional significance in ER stress response, but is less important for salt stress response. Thus, our results suggest that expression control of Ptp2 and Cmp2 protein phosphatases at the promoter level is crucial for adaptive responses to ER stress.
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174
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Cohen BE. Membrane Thickness as a Key Factor Contributing to the Activation of Osmosensors and Essential Ras Signaling Pathways. Front Cell Dev Biol 2018; 6:76. [PMID: 30087894 PMCID: PMC6066546 DOI: 10.3389/fcell.2018.00076] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 06/25/2018] [Indexed: 12/17/2022] Open
Abstract
The cell membrane provides a functional link between the external environment and the replicating DNA genome by using ligand-gated receptors and chemical signals to activate signaling transduction pathways. However, increasing evidence has also indicated that the phospholipid bilayer itself by altering various physical parameters serves as a sensor that regulate membrane proteins in a specific manner. Changes in thickness and/or curvature of the membrane have been shown to be induced by mechanical forces and transmitted through the transmembrane helices of several types of mechanosensitive (MS) ion channels underlying functions such as osmoregulation in bacteria and sensory processing in mammalian cells. This review focus on recent protein functional and structural data indicating that the activation of bacterial and yeast osmosensors is consistent with thickness-induced tilting changes of the transmembrane domains of these proteins. Membrane thinning in combination with curvature changes may also lead to the lateral transfer of the small lipid-anchored GTPases Ras1 and H-Ras out of lipid rafts for clustering and signaling. The modulation of signaling pathways by amphiphilic peptides and the membrane-active antibiotics colistin and Amphotericin B is also discussed.
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Affiliation(s)
- B Eleazar Cohen
- Division of External Activities, National Institute of Allergy and Infectious Diseases, Bethesda, MD, United States
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175
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Adaption to stress via Pbs2 during Metarhizium rileyi conidia and microsclerotia development. World J Microbiol Biotechnol 2018; 34:107. [PMID: 29971586 DOI: 10.1007/s11274-018-2475-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Accepted: 06/07/2018] [Indexed: 11/27/2022]
Abstract
The high osmolarity glycerol (HOG) pathway plays important role in Metarhizium rileyi microsclerotia (MS) development. To investigate how M. rileyi transduce growth stress and regulate MS development via mitogen-activated protein kinase kinase (MAPKK) Pbs2, phenotypic characterization of the yeast Pbs2 homolog were performed. Expression of pbs2 peaked when MS formation occurred day 3 in liquid amended medium. Compared with wild-type and complemented strains, deletion mutant of pbs2 (Δpbs2) delayed dimorphic switch and vegetative growth, displayed sensitivities to various stress, and significantly reduced conidial (98%) and MS (40%) yields. Furthermore, transcription analysis showed that other genes of HOG signaling pathway were down-regulated in Δpbs2 mutants. Insect bioassays revealed that Δpbs2 mutants had decreased virulence levels in topical (24%) and injection (53%) bioassays. This study confirmed that Pbs2 play important roles in colony morphology, conidiation, stresses response and MS development in M. rileyi.
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176
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Abstract
Systems biology seeks to combine experiments with computation to predict biological behaviors. However, despite tremendous data and knowledge, biological models make less-accurate predictions compared with other fields. By analyzing single-cell, single-molecule measurements of mRNA during yeast stress response, we explore why and how the shapes of experimental distributions control prediction accuracy. We show how asymmetric data distributions with long tails cause standard modeling approaches to yield excellent fits but make meaningless predictions. We show how these biases arise from the violation of fundamental assumptions in standard modeling approaches. We demonstrate how advanced computational tools solve this dilemma and achieve predictive understanding of spatiotemporal mechanisms of transcription control including RNA polymerase initiation and elongation and mRNA accumulation, transport, and decay. Despite substantial experimental and computational efforts, mechanistic modeling remains more predictive in engineering than in systems biology. The reason for this discrepancy is not fully understood. One might argue that the randomness and complexity of biological systems are the main barriers to predictive understanding, but these issues are not unique to biology. Instead, we hypothesize that the specific shapes of rare single-molecule event distributions produce substantial yet overlooked challenges for biological models. We demonstrate why modern statistical tools to disentangle complexity and stochasticity, which assume normally distributed fluctuations or enormous datasets, do not apply to the discrete, positive, and nonsymmetric distributions that characterize mRNA fluctuations in single cells. As an example, we integrate single-molecule measurements and advanced computational analyses to explore mitogen-activated protein kinase induction of multiple stress response genes. Through systematic analyses of different metrics to compare the same model to the same data, we elucidate why standard modeling approaches yield nonpredictive models for single-cell gene regulation. We further explain how advanced tools recover precise, reproducible, and predictive understanding of transcription regulation mechanisms, including gene activation, polymerase initiation, elongation, mRNA accumulation, spatial transport, and decay.
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177
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Lemos Junior WJF, da Silva Duarte V, Treu L, Campanaro S, Nadai C, Giacomini A, Corich V. Whole genome comparison of two Starmerella bacillaris strains with other wine yeasts uncovers genes involved in modulating important winemaking traits. FEMS Yeast Res 2018; 18:5046425. [DOI: 10.1093/femsyr/foy069] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 06/27/2018] [Indexed: 11/13/2022] Open
Affiliation(s)
- Wilson Josè Fernandes Lemos Junior
- Department of Agronomy Food Natural Resources Animals and Environment (DAFNAE), University of Padova, Viale dell’Università 16, Legnaro, 35020, Italy
| | - Vinicius da Silva Duarte
- Department of Microbiology, Universidade Federal de Viçosa, Av. PH Rolfs s/n, Campus Universitário, 36570 000, Viçosa, Brazil
| | - Laura Treu
- Department of Agronomy Food Natural Resources Animals and Environment (DAFNAE), University of Padova, Viale dell’Università 16, Legnaro, 35020, Italy
| | - Stefano Campanaro
- Department of Biology, University of Padova, Via U. Bassi 58b, 35121, Padova, Italy
| | - Chiara Nadai
- Department of Agronomy Food Natural Resources Animals and Environment (DAFNAE), University of Padova, Viale dell’Università 16, Legnaro, 35020, Italy
- Interdepartmental Centre for Research in Viticulture and Enology (CIRVE), University of Padova, Via XXVIII Aprile 14, Conegliano, 31015, Italy
| | - Alessio Giacomini
- Department of Agronomy Food Natural Resources Animals and Environment (DAFNAE), University of Padova, Viale dell’Università 16, Legnaro, 35020, Italy
- Interdepartmental Centre for Research in Viticulture and Enology (CIRVE), University of Padova, Via XXVIII Aprile 14, Conegliano, 31015, Italy
| | - Viviana Corich
- Department of Agronomy Food Natural Resources Animals and Environment (DAFNAE), University of Padova, Viale dell’Università 16, Legnaro, 35020, Italy
- Interdepartmental Centre for Research in Viticulture and Enology (CIRVE), University of Padova, Via XXVIII Aprile 14, Conegliano, 31015, Italy
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178
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Abhinandan K, Skori L, Stanic M, Hickerson NMN, Jamshed M, Samuel MA. Abiotic Stress Signaling in Wheat - An Inclusive Overview of Hormonal Interactions During Abiotic Stress Responses in Wheat. FRONTIERS IN PLANT SCIENCE 2018; 9:734. [PMID: 29942321 PMCID: PMC6004395 DOI: 10.3389/fpls.2018.00734] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 05/15/2018] [Indexed: 05/19/2023]
Abstract
Rapid global warming directly impacts agricultural productivity and poses a major challenge to the present-day agriculture. Recent climate change models predict severe losses in crop production worldwide due to the changing environment, and in wheat, this can be as large as 42 Mt/°C rise in temperature. Although wheat occupies the largest total harvested area (38.8%) among the cereals including rice and maize, its total productivity remains the lowest. The major production losses in wheat are caused more by abiotic stresses such as drought, salinity, and high temperature than by biotic insults. Thus, understanding the effects of these stresses becomes indispensable for wheat improvement programs which have depended mainly on the genetic variations present in the wheat genome through conventional breeding. Notably, recent biotechnological breakthroughs in the understanding of gene functions and access to whole genome sequences have opened new avenues for crop improvement. Despite the availability of such resources in wheat, progress is still limited to the understanding of the stress signaling mechanisms using model plants such as Arabidopsis, rice and Brachypodium and not directly using wheat as the model organism. This review presents an inclusive overview of the phenotypic and physiological changes in wheat due to various abiotic stresses followed by the current state of knowledge on the identified mechanisms of perception and signal transduction in wheat. Specifically, this review provides an in-depth analysis of different hormonal interactions and signaling observed during abiotic stress signaling in wheat.
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Affiliation(s)
| | | | | | | | | | - Marcus A. Samuel
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
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179
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Lee J, Levin DE. Intracellular mechanism by which arsenite activates the yeast stress MAPK Hog1. Mol Biol Cell 2018; 29:1904-1915. [PMID: 29846136 PMCID: PMC6085820 DOI: 10.1091/mbc.e18-03-0185] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Stress-activated MAPKs (SAPKs) respond to a wide variety of stressors. In most cases, the pathways through which specific stress signals are transmitted to the SAPKs are not known. In this study, we delineate the intracellular signaling pathway by which the trivalent toxic metalloid arsenite [As(III)] activates the yeast SAPK Hog1. We demonstrate that, to activate Hog1, As(III) must enter the cell through the glycerol channel Fps1 and must be metabolized to methyl arsenite [MAs(III)] by the dimeric methyltransferase Mtq2:Trm112. We found that Mtq2:Trm1 displays SAM-dependent methyltransferase activity toward both As(III) and MAs(III). Additionally, we present genetic and biochemical evidence that MAs(III), but not As(III), is a potent inhibitor of the protein tyrosine phosphatases (Ptp2 and Ptp3) that normally maintain Hog1 in an inactive state. Inhibition of Ptp2 and Ptp3 by MAs(III) results in elevated Hog1 phosphorylation without activation of the protein kinases that act upstream of the SAPK and raises the possibility that other Hog1-activating stressors act intracellularly at different points along the canonical Hog1 activation pathway. Finally, we show that arsenate [As(V)], a pentavalent form of arsenic, also activates Hog1, but through a pathway that is distinct from that of As(III) and involves activation of the Hog1 MEK Pbs2.
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Affiliation(s)
- Jongmin Lee
- Department of Molecular and Cell Biology, Boston University Goldman School of Dental Medicine, Boston, MA 02118
| | - David E Levin
- Department of Molecular and Cell Biology, Boston University Goldman School of Dental Medicine, Boston, MA 02118.,Department of Microbiology, Boston University School of Medicine, Boston, MA 02118
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180
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Gu Q, Ji T, Sun X, Huang H, Zhang H, Lu X, Wu L, Huo R, Wu H, Gao X. Histone H3 lysine 9 methyltransferase FvDim5 regulates fungal development, pathogenicity and osmotic stress responses in Fusarium verticillioides. FEMS Microbiol Lett 2018; 364:4094912. [PMID: 28957455 DOI: 10.1093/femsle/fnx184] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 08/23/2017] [Indexed: 12/30/2022] Open
Abstract
Histone methylation plays important biological roles in eukaryotic cells. Methylation of lysine 9 at histone H3 (H3K9me) is critical for regulating chromatin structure and gene transcription. Dim5 is a lysine histone methyltransferase (KHMTase) enzyme, which is responsible for the methylation of H3K9 in eukaryotes. In the current study, we identified a single ortholog of Neurospora crassa Dim5 in Fusarium verticillioides. In this study, we report that FvDim5 regulates the trimethylation of H3K9 (H3K9me3). The FvDIM5 deletion mutant (ΔFvDim5) showed significant defects in conidiation, perithecium production and fungal virulence. Unexpectedly, we found that deletion of FvDIM5 resulted in increased tolerance to osmotic stresses and upregulated FvHog1 phosphorylation. These results indicate the importance of FvDim5 for the regulation of fungal development, pathogenicity and osmotic stress responses in F. verticillioides.
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Affiliation(s)
- Qin Gu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Tiantian Ji
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Xiao Sun
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Hai Huang
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Hao Zhang
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Xi Lu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Liming Wu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Rong Huo
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Huijun Wu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Xuewen Gao
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing 210095, China
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181
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Goto T, Ito Y, Michiue T. Roles of Xenopus chemokine ligand CXCLh (XCXCLh) in early embryogenesis. Dev Growth Differ 2018; 60:226-238. [PMID: 29700804 DOI: 10.1111/dgd.12432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 03/08/2018] [Accepted: 03/15/2018] [Indexed: 01/13/2023]
Abstract
Several chemokine molecules control cell movements during early morphogenesis. However, it is unclear whether chemokine molecules affect cell fate. Here, we identified and characterized the CXC-type chemokine ligand in Xenopus laevis, Xenopus CXCLh (XCXCLh), during early embryogenesis. XCXCLh is expressed in the dorsal vegetal region at the gastrula stage. Both overexpression and knockdown of XCXCLh in the dorsal region inhibited gastrulation. XCXCLh contributed to the attraction of mesendodermal cells and accelerated the reassembly of scratched culture cells. Also, XCXCLh contributed to early endodermal induction. Overexpression of VegTmRNA or high concentrations of calcium ions induced XCXCLh expression. XCXCLh may play roles in both cell movements and differentiation during early Xenopus embryogenesis.
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Affiliation(s)
- Toshiyasu Goto
- Department of Molecular Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yuzuru Ito
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Tatsuo Michiue
- Department of Life Sciences (Biology), Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo, Japan
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182
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Ji H, Lu X, Zong H, Zhuge B. Functional and expression studies of two novel STL1 genes of the osmotolerant and glycerol utilization yeast Candida glycerinogenes. J GEN APPL MICROBIOL 2018; 64:121-126. [PMID: 29607876 DOI: 10.2323/jgam.2017.10.001] [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] [Indexed: 11/03/2022]
Abstract
Candida glycerinogenes is an osmotolerant yeast used for commercial glycerol production, as well as a glycerol utilization yeast which produces high biomass on glycerol medium. In the present study, two STL1 homologues CgSTL1 and CgSTL2 encoding the putative glycerol transporters were identified, and their products were found to be localized to plasma membranes by tagging GFP protein. The functions of CgSTL1 and CgSTL2 on glycerol transport were confirmed by their expression in S. cerevisiae STL1 null mutant and simultaneous deletion in C. glycerinogenes. The expression of CgSTL1 were osmotic-induced, whereas that of CgSTL2 was constitutive. Over-expression of CgSTL1 and CgSTL2 in C. glycerinogenes resulted in improved glycerol consumption rate and cell growth. Our study provided more details on the glycerol transporter of C. glycerinogenes, the potential cell factory for using glycerol as a carbon source.
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Affiliation(s)
- Hao Ji
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
| | - Xinyao Lu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
| | - Hong Zong
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
| | - Bin Zhuge
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
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183
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Ji H, Lu X, Zong H, Zhuge B. γ-aminobutyric acid accumulation enhances the cell growth of Candida glycerinogenes under hyperosmotic conditions. J GEN APPL MICROBIOL 2018. [PMID: 29526924 DOI: 10.2323/jgam.2017.08.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
γ-aminobutyric acid (GABA) is an important non-protein amino acid involved in the response to various environmental stresses in plant cells. The objectives of this study was to test the hypothesis that intracellular accumulation of GABA improves osmotic tolerance in the unconventional yeast Candida glycerinogenes. In C. glycerinogenes, the expression of UGA4 encoding GABA-specific permease is highly induced by hyperosmotic stress. Exogenous GABA application enhanced intracellular GABA accumulation and promoted cell growth under hyperosmotic conditions. Overexpression of the glutamate decarboxylase gene GAD1 resulted in an increased intracellular GABA and improvement in cell growth under hyperosmotic conditions. These results indicated that improving intracellular GABA accumulation of C. glycerinogenes, either through exogenous application or cellular synthesis, is available for improving the tolerance to hyperosmotic stress. We demonstrate that GABA accumulation plays an important role in osmotic stress resistance of the unconventional yeast C. glycerinogenes.
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Affiliation(s)
- Hao Ji
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
| | - Xinyao Lu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
| | - Hong Zong
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
| | - Bin Zhuge
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University
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184
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Boyce KJ, De Souza DP, Dayalan S, Pasricha S, Tull D, McConville MJ, Andrianopoulos A. Talaromyces marneffei simA Encodes a Fungal Cytochrome P450 Essential for Survival in Macrophages. mSphere 2018; 3:e00056-18. [PMID: 29577082 PMCID: PMC5863032 DOI: 10.1128/msphere.00056-18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 02/23/2018] [Indexed: 11/20/2022] Open
Abstract
Fungi are adept at occupying specific environmental niches and often exploit numerous secondary metabolites generated by the cytochrome P450 (CYP) monoxygenases. This report describes the characterization of a yeast-specific CYP encoded by simA ("survival in macrophages"). Deletion of simA does not affect yeast growth at 37°C in vitro but is essential for yeast cell production during macrophage infection. The ΔsimA strain exhibits reduced conidial germination and intracellular growth of yeast in macrophages, suggesting that the enzymatic product of SimA is required for normal fungal growth in vivo. Intracellular ΔsimA yeast cells exhibit cell wall defects, and metabolomic and chemical sensitivity data suggest that SimA may promote chitin synthesis or deposition in vitro. In vivo, ΔsimA yeast cells subsequently lyse and are degraded, suggesting that SimA may increase resistance to and/or suppress host cell biocidal effectors. The results suggest that simA synthesizes a secondary metabolite that allows T. marneffei to occupy the specific intracellular environmental niche within the macrophage. IMPORTANCE This study in a dimorphic fungal pathogen uncovered a role for a yeast-specific cytochrome P450 (CYP)-encoding gene in the ability of T. marneffei to grow as yeast cells within the host macrophages. This report will inspire further research into the role of CYPs and secondary metabolite synthesis during fungal pathogenic growth.
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Affiliation(s)
- Kylie J. Boyce
- School of Biosciences, The University of Melbourne, Melbourne, Australia
| | - David P. De Souza
- Metabolomics Australia, Bio21 Institute, The University of Melbourne, Melbourne, Australia
| | - Saravanan Dayalan
- Metabolomics Australia, Bio21 Institute, The University of Melbourne, Melbourne, Australia
| | - Shivani Pasricha
- School of Biosciences, The University of Melbourne, Melbourne, Australia
| | - Dedreia Tull
- Metabolomics Australia, Bio21 Institute, The University of Melbourne, Melbourne, Australia
| | - Malcolm J. McConville
- Department of Biochemistry and Molecular Biology, Bio21 Institute, The University of Melbourne, Melbourne, Australia
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185
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186
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Mojardín L, Vega M, Moreno F, Schmitz HP, Heinisch JJ, Rodicio R. Lack of the NAD+-dependent glycerol 3-phosphate dehydrogenase impairs the function of transcription factors Sip4 and Cat8 required for ethanol utilization in Kluyveromyces lactis. Fungal Genet Biol 2018; 111:16-29. [DOI: 10.1016/j.fgb.2017.11.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 11/19/2017] [Accepted: 11/21/2017] [Indexed: 11/25/2022]
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187
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Vázquez-Ibarra A, Subirana L, Ongay-Larios L, Kawasaki L, Rojas-Ortega E, Rodríguez-González M, de Nadal E, Posas F, Coria R. Activation of the Hog1 MAPK by the Ssk2/Ssk22 MAP3Ks, in the absence of the osmosensors, is not sufficient to trigger osmostress adaptation in Saccharomyces cerevisiae. FEBS J 2018; 285:1079-1096. [PMID: 29341399 DOI: 10.1111/febs.14385] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 12/07/2017] [Accepted: 01/11/2018] [Indexed: 01/13/2023]
Abstract
Yeast cells respond to hyperosmotic stress by activating the high-osmolarity glycerol (HOG) pathway, which consists of two branches, Hkr1/Msb2-Sho1 and Sln1, which trigger phosphorylation and nuclear internalization of the Hog1 mitogen-activated protein kinase. In the nucleus, Hog1 regulates gene transcription and cell cycle progression, which allows the cell to respond and adapt to hyperosmotic conditions. This study demonstrates that the uncoupling of the known sensors of both branches of the pathway at the level of Ssk1 and Ste11 impairs cell growth in hyperosmotic medium. However, under these conditions, Hog1 was still phosphorylated and internalized into the nucleus, suggesting the existence of an alternative Hog1 activation mechanism. In the ssk1ste11 mutant, phosphorylated Hog1 failed to associate with chromatin and to activate transcription of canonical hyperosmolarity-responsive genes. Accordingly, Hog1 also failed to induce glycerol production at the levels of a wild-type strain. Inactivation of the Ptp2 phosphatase moderately rescued growth impairment of the ssk1ste11 mutant under hyperosmotic conditions, indicating that downregulation of the HOG pathway only partially explains the phenotypes displayed by the ssk1ste11 mutant. Cell cycle defects were also observed in response to stress when Hog1 was phosphorylated in the ssk1ste11 mutant. Taken together, these observations indicate that Hog1 phosphorylation by noncanonical upstream mechanisms is not sufficient to trigger a protective response to hyperosmotic stress.
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Affiliation(s)
- Araceli Vázquez-Ibarra
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Cd de México, México
| | - Laia Subirana
- Cell Signaling Research Group, Departament de Ciències, Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
| | - Laura Ongay-Larios
- Unidad de Biología Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Cd de México, México
| | - Laura Kawasaki
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Cd de México, México
| | - Eréndira Rojas-Ortega
- Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Cd de México, México
| | - Miriam Rodríguez-González
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Cd de México, México
| | - Eulàlia de Nadal
- Cell Signaling Research Group, Departament de Ciències, Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
| | - Francesc Posas
- Cell Signaling Research Group, Departament de Ciències, Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
| | - Roberto Coria
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Cd de México, México
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188
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Kim H, Thak EJ, Yeon JY, Sohn MJ, Choo JH, Kim JY, Kang HA. Functional analysis of Mpk1-mediated cell wall integrity signaling pathway in the thermotolerant methylotrophic yeast Hansenula polymorpha. J Microbiol 2018; 56:72-82. [PMID: 29299840 DOI: 10.1007/s12275-018-7508-6] [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: 11/22/2017] [Revised: 12/05/2017] [Accepted: 12/05/2017] [Indexed: 10/18/2022]
Abstract
Understanding the characteristics and regulation mechanisms of cell wall integrity (CWI) in yeast is important not only for basic research but also in biotechnological applications. We found significantly different CWIs in two representative strains of the thermotolerant methylotrophic yeast Hansenula polymorpha. Compared to the A16 strain (classified as Ogataea polymorpha), the DL1-L strain (classified as Ogataea parapolymorpha) has a thinner cell wall that was found to be more fragile following long-term cultivation and more sensitive to zymolyase. To gain a deeper insight into this difference, we compared the characteristics of the Mpk1pmediated CWI signaling pathway in the two strains. While a DL1-L mutant deficient in Mpk1p (mpk1Δ) showed severe growth retardation at both normal and high growth temperatures and in the presence of cell-wall disrupting agents, the A16 mpk1Δ mutant displayed only a mild defect in cell growth. Sorbitol effect on rescuing growth retardation was different in the two mpk1Δ strains, which could partly be ascribed to subtle differences in the activation of HOG pathway. Among the cell wall disruptors evaluated, only caffeine clearly increased phosphorylation of Mpk1p in DL1-L, but not in A16. A transcriptome analysis of the DL1-L strain revealed that caffeine significantly increased the expression of a subset of cell-wall related genes in an Mpk1p-dependent manner, but not the expected Rlm1-target genes. Taken together, our data support an essential role for Mpk1p in maintaining CWI in H. polymorpha, although the requirement for Mpk1p and its regulation under diverse stress conditions varies depending on the strain background.
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Affiliation(s)
- Hyunah Kim
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Eun Jung Thak
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Ji Yoon Yeon
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Min Jeong Sohn
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Jin Ho Choo
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Jeong-Yoon Kim
- Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon, 34134, Republic of Korea.
| | - Hyun Ah Kang
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea.
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189
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Holt L, Hallatschek O, Delarue M. Mechano-chemostats to study the effects of compressive stress on yeast. Methods Cell Biol 2018; 147:215-231. [DOI: 10.1016/bs.mcb.2018.06.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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190
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Martins TS, Pereira C, Canadell D, Vilaça R, Teixeira V, Moradas-Ferreira P, de Nadal E, Posas F, Costa V. The Hog1p kinase regulates Aft1p transcription factor to control iron accumulation. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1863:61-70. [DOI: 10.1016/j.bbalip.2017.10.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 09/15/2017] [Accepted: 10/09/2017] [Indexed: 12/22/2022]
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191
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Sabir F, Loureiro-Dias MC, Soveral G, Prista C. Functional relevance of water and glycerol channels in Saccharomyces cerevisiae. FEMS Microbiol Lett 2017; 364:3739791. [PMID: 28430948 DOI: 10.1093/femsle/fnx080] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 04/18/2017] [Indexed: 12/27/2022] Open
Abstract
Our understanding of the functional relevance of orthodox aquaporins and aquaglyceroporins in Saccharomyces cerevisiae is essentially based on phenotypic variations obtained by expression/overexpression/deletion of these major intrinsic proteins in selected strains. These water/glycerol channels are considered crucial during various life-cycle phases, such as sporulation and mating and in some life processes such as rapid freeze-thaw tolerance, osmoregulation and phenomena associated with cell surface. Despite their putative functional roles not only as channels but also as sensors, their underlying mechanisms and their regulation are still poorly understood. In the present review, we summarize and discuss the physiological relevance of S. cerevisiae aquaporins (Aqy1 and Aqy2) and aquaglyceroporins (Fps1 and Yfl054c). In particular, the fact that most S. cerevisiae laboratory strains harbor genes coding for non-functional aquaporins, while wild and industrial strains possess at least one functional aquaporin, suggests that aquaporin activity is required for cell survival under more harsh conditions.
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Affiliation(s)
- Farzana Sabir
- LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda 1349-017 Lisboa, Portugal.,Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa,1649-003 Lisboa, Portugal
| | - Maria C Loureiro-Dias
- LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda 1349-017 Lisboa, Portugal
| | - Graça Soveral
- Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa,1649-003 Lisboa, Portugal
| | - Catarina Prista
- LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda 1349-017 Lisboa, Portugal
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192
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The CWI Pathway: Regulation of the Transcriptional Adaptive Response to Cell Wall Stress in Yeast. J Fungi (Basel) 2017; 4:jof4010001. [PMID: 29371494 PMCID: PMC5872304 DOI: 10.3390/jof4010001] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 12/11/2017] [Accepted: 12/19/2017] [Indexed: 12/14/2022] Open
Abstract
Fungi are surrounded by an essential structure, the cell wall, which not only confers cell shape but also protects cells from environmental stress. As a consequence, yeast cells growing under cell wall damage conditions elicit rescue mechanisms to provide maintenance of cellular integrity and fungal survival. Through transcriptional reprogramming, yeast modulate the expression of genes important for cell wall biogenesis and remodeling, metabolism and energy generation, morphogenesis, signal transduction and stress. The yeast cell wall integrity (CWI) pathway, which is very well conserved in other fungi, is the key pathway for the regulation of this adaptive response. In this review, we summarize the current knowledge of the yeast transcriptional program elicited to counterbalance cell wall stress situations, the role of the CWI pathway in the regulation of this program and the importance of the transcriptional input received by other pathways. Modulation of this adaptive response through the CWI pathway by positive and negative transcriptional feedbacks is also discussed. Since all these regulatory mechanisms are well conserved in pathogenic fungi, improving our knowledge about them will have an impact in the developing of new antifungal therapies.
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193
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Stojanovski K, Ferrar T, Benisty H, Uschner F, Delgado J, Jimenez J, Solé C, de Nadal E, Klipp E, Posas F, Serrano L, Kiel C. Interaction Dynamics Determine Signaling and Output Pathway Responses. Cell Rep 2017; 19:136-149. [PMID: 28380353 DOI: 10.1016/j.celrep.2017.03.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Revised: 12/27/2016] [Accepted: 03/08/2017] [Indexed: 12/28/2022] Open
Abstract
The understanding of interaction dynamics in signaling pathways can shed light on pathway architecture and provide insights into targets for intervention. Here, we explored the relevance of kinetic rate constants of a key upstream osmosensor in the yeast high-osmolarity glycerol-mitogen-activated protein kinase (HOG-MAPK) pathway to signaling output responses. We created mutant pairs of the Sln1-Ypd1 complex interface that caused major compensating changes in the association (kon) and dissociation (koff) rate constants (kinetic perturbations) but only moderate changes in the overall complex affinity (Kd). Yeast cells carrying a Sln1-Ypd1 mutant pair with moderate increases in kon and koff displayed a lower threshold of HOG pathway activation than wild-type cells. Mutants with higher kon and koff rates gave rise to higher basal signaling and gene expression but impaired osmoadaptation. Thus, the kon and koff rates of the components in the Sln1 osmosensor determine proper signaling dynamics and osmoadaptation.
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Affiliation(s)
- Klement Stojanovski
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Tony Ferrar
- EMBL/CRG Systems Biology Research Unit, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Hannah Benisty
- EMBL/CRG Systems Biology Research Unit, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Friedemann Uschner
- Theoretical Biophysics, Humboldt-Universität zu Berlin, 10115 Berlin, Germany
| | - Javier Delgado
- EMBL/CRG Systems Biology Research Unit, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Javier Jimenez
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Carme Solé
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Eulalia de Nadal
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Edda Klipp
- Theoretical Biophysics, Humboldt-Universität zu Berlin, 10115 Berlin, Germany
| | - Francesc Posas
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, 08003 Barcelona, Spain.
| | - Luis Serrano
- EMBL/CRG Systems Biology Research Unit, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra, 08003 Barcelona, Spain; ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain.
| | - Christina Kiel
- EMBL/CRG Systems Biology Research Unit, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra, 08003 Barcelona, Spain.
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194
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Pomatto LCD, Davies KJA. The role of declining adaptive homeostasis in ageing. J Physiol 2017; 595:7275-7309. [PMID: 29028112 PMCID: PMC5730851 DOI: 10.1113/jp275072] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 09/01/2017] [Indexed: 12/12/2022] Open
Abstract
Adaptive homeostasis is "the transient expansion or contraction of the homeostatic range for any given physiological parameter in response to exposure to sub-toxic, non-damaging, signalling molecules or events, or the removal or cessation of such molecules or events" (Davies, 2016). Adaptive homeostasis enables biological systems to make continuous short-term adjustments for optimal functioning despite ever-changing internal and external environments. Initiation of adaptation in response to an appropriate signal allows organisms to successfully cope with much greater, normally toxic, stresses. These short-term responses are initiated following effective signals, including hypoxia, cold shock, heat shock, oxidative stress, exercise-induced adaptation, caloric restriction, osmotic stress, mechanical stress, immune response, and even emotional stress. There is now substantial literature detailing a decline in adaptive homeostasis that, unfortunately, appears to manifest with ageing, especially in the last third of the lifespan. In this review, we present the hypothesis that one hallmark of the ageing process is a significant decline in adaptive homeostasis capacity. We discuss the mechanistic importance of diminished capacity for short-term (reversible) adaptive responses (both biochemical and signal transduction/gene expression-based) to changing internal and external conditions, for short-term survival and for lifespan and healthspan. Studies of cultured mammalian cells, worms, flies, rodents, simians, apes, and even humans, all indicate declining adaptive homeostasis as a potential contributor to age-dependent senescence, increased risk of disease, and even mortality. Emerging work points to Nrf2-Keap1 signal transduction pathway inhibitors, including Bach1 and c-Myc, both of whose tissue concentrations increase with age, as possible major causes for age-dependent loss of adaptive homeostasis.
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Affiliation(s)
- Laura C. D. Pomatto
- Leonard Davis School of Gerontology of the Ethel Percy Andrus Gerontology CenterUniversity of Southern CaliforniaLos AngelesCA 90089USA
| | - Kelvin J. A. Davies
- Leonard Davis School of Gerontology of the Ethel Percy Andrus Gerontology CenterUniversity of Southern CaliforniaLos AngelesCA 90089USA
- Molecular and Computational Biology Program, Department of Biological Sciences of the Dornsife College of LettersArts & Sciences: the University of Southern CaliforniaLos AngelesCA 90089‐0191USA
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195
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Mora A, Zhang SS, Carson G, Nabiswa B, Hossler P, Yoon S. Sustaining an efficient and effective CHO cell line development platform by incorporation of 24-deep well plate screening and multivariate analysis. Biotechnol Prog 2017; 34:175-186. [DOI: 10.1002/btpr.2584] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 11/05/2017] [Indexed: 12/31/2022]
Affiliation(s)
- Alessandro Mora
- Cell Line Development, Process Sciences Dept.; AbbVie Bioresearch Center; Worcester MA
- Francis College of Engineering; University of Massachusetts Lowell; Lowell MA
| | - Sheng Sam Zhang
- Cell Line Development, Process Sciences Dept.; AbbVie Bioresearch Center; Worcester MA
| | - Gerald Carson
- Cell Line Development, Process Sciences Dept.; AbbVie Bioresearch Center; Worcester MA
| | - Bernard Nabiswa
- Cell Line Development, Process Sciences Dept.; AbbVie Bioresearch Center; Worcester MA
| | - Patrick Hossler
- Cell Culture, Process Sciences Dept.; AbbVie Bioresearch Center; Worcester MA
| | - Seongkyu Yoon
- Francis College of Engineering; University of Massachusetts Lowell; Lowell MA
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196
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Silva A, Cavero S, Begley V, Solé C, Böttcher R, Chávez S, Posas F, de Nadal E. Regulation of transcription elongation in response to osmostress. PLoS Genet 2017; 13:e1007090. [PMID: 29155810 PMCID: PMC5720810 DOI: 10.1371/journal.pgen.1007090] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 12/07/2017] [Accepted: 10/30/2017] [Indexed: 12/31/2022] Open
Abstract
Cells trigger massive changes in gene expression upon environmental fluctuations. The Hog1 stress-activated protein kinase (SAPK) is an important regulator of the transcriptional activation program that maximizes cell fitness when yeast cells are exposed to osmostress. Besides being associated with transcription factors bound at target promoters to stimulate transcriptional initiation, activated Hog1 behaves as a transcriptional elongation factor that is selective for stress-responsive genes. Here, we provide insights into how this signaling kinase functions in transcription elongation. Hog1 phosphorylates the Spt4 elongation factor at Thr42 and Ser43 and such phosphorylations are essential for the overall transcriptional response upon osmostress. The phosphorylation of Spt4 by Hog1 regulates RNA polymerase II processivity at stress-responsive genes, which is critical for cell survival under high osmostress conditions. Thus, the direct regulation of Spt4 upon environmental insults serves to stimulate RNA Pol II elongation efficiency.
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Affiliation(s)
- Andrea Silva
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
| | - Santiago Cavero
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
| | - Victoria Begley
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Virgen del Rocío-CSIC-Universidad de Sevilla, and Departamento de Genética, Universidad de Sevilla, Sevilla, Spain
| | - Carme Solé
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
| | - René Böttcher
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
| | - Sebastián Chávez
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Virgen del Rocío-CSIC-Universidad de Sevilla, and Departamento de Genética, Universidad de Sevilla, Sevilla, Spain
| | - Francesc Posas
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
| | - Eulàlia de Nadal
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
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197
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Turk M, Gostinčar C. Glycerol metabolism genes in Aureobasidium pullulans and Aureobasidium subglaciale. Fungal Biol 2017; 122:63-73. [PMID: 29248115 DOI: 10.1016/j.funbio.2017.10.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 09/18/2017] [Accepted: 10/15/2017] [Indexed: 11/18/2022]
Abstract
Intracellular glycerol accumulation is one of the main fungal adaptations to osmotic and also cold stress. We investigated the management of glycerol metabolism in polyextremotolerant black yeasts Aureobasidium pullulans and Aureobasidium subglaciale. We show that increased salinity (5 % and 10 %; w/v), but not cold (10 °C) trigger intracellular glycerol accumulation. The transcriptional response of the genes involved in glycerol synthesis, degradation and import, to increased salinity, low temperature or a combination of both was analysed with real-time PCR. Each of the two species contains an NAD+-dependent glycerol-3-phosphate dehydrogenase, a glycerol-3-phosphate phosphatase, a mitochondrial glycerol-3-phosphate dehydrogenase, two copies of a glycerol kinase, and more than ten copies of major facilitator superfamily transporters similar to glycerol proton symporters. Similarly to glycerol accumulation itself, transcriptional response to hypersaline stress was larger compared to low temperature stress and was more consistent in A. pullulans compared to A. subglaciale, reflecting the different stress tolerance and ecological strategy of each species.
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Affiliation(s)
- Martina Turk
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
| | - Cene Gostinčar
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
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198
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Tang C, Xiong D, Fang Y, Tian C, Wang Y. The two-component response regulator VdSkn7 plays key roles in microsclerotial development, stress resistance and virulence of Verticillium dahliae. Fungal Genet Biol 2017; 108:26-35. [PMID: 28917999 DOI: 10.1016/j.fgb.2017.09.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 09/07/2017] [Accepted: 09/12/2017] [Indexed: 11/16/2022]
Abstract
The fungus Verticillium dahliae causes vascular wilt disease on various plant species resulting in devastating yield losses worldwide. The capacity of V. dahliae to colonize in host plant xylem and disseminate by microsclerotia has led to studies to evaluate genes associated with pathogenesis and microsclerotia formation. Here, we identified and characterized a V. dahliae homolog to Skn7, a two-component stress response regulator of Saccharomyces cerevisiae. Results showed that melanized microsclerotia formation and conidiation were significantly inhibited in the VdSkn7 deletion mutants. VdSkn7-deficient mutants displayed severe growth defect under heat shock, cell wall perturbing agents and H2O2, and were significantly less virulent but were not sensitive to osmotic stresses compared to the wild-type strain. Finally, we demonstrated that VdSkn7 is required for the plant penetration. Taken together, our study thus provides new evidence on the functional conservation and divergence of Skn7 orthologs among fungal organisms and indicates that VdSkn7 contributes to microsclerotial development, virulence and stress response of V. dahliae.
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Affiliation(s)
- Chen Tang
- Beijing Key Laboratory for Forest Pest Control, College of Forestry, Beijing Forestry University, Beijing, China
| | - Dianguang Xiong
- Beijing Key Laboratory for Forest Pest Control, College of Forestry, Beijing Forestry University, Beijing, China
| | - Yulin Fang
- Beijing Key Laboratory for Forest Pest Control, College of Forestry, Beijing Forestry University, Beijing, China
| | - Chengming Tian
- Beijing Key Laboratory for Forest Pest Control, College of Forestry, Beijing Forestry University, Beijing, China
| | - Yonglin Wang
- Beijing Key Laboratory for Forest Pest Control, College of Forestry, Beijing Forestry University, Beijing, China.
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199
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Day AM, Herrero-de-Dios CM, MacCallum DM, Brown AJP, Quinn J. Stress-induced nuclear accumulation is dispensable for Hog1-dependent gene expression and virulence in a fungal pathogen. Sci Rep 2017; 7:14340. [PMID: 29085028 PMCID: PMC5662626 DOI: 10.1038/s41598-017-14756-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 10/09/2017] [Indexed: 11/11/2022] Open
Abstract
Stress-activated protein kinase (SAPK) pathways are evolutionarily conserved eukaryotic signalling modules that are essential for the virulence of human pathogenic fungi. The Hog1 SAPK in Candida albicans is robustly phosphorylated in response to a number of host-imposed stresses, and is essential for virulence. The current dogma is that stress-induced phosphorylation activates the SAPK, and promotes its nuclear accumulation that is necessary for the expression of SAPK-dependent stress-protective genes. Here we challenge this dogma. C. albicans strains were constructed in which Hog1 was either tethered to the plasma membrane or constitutively nuclear. Strikingly, tethering Hog1 to the plasma membrane did not abrogate stress resistance or stress-induced gene expression. Furthermore, preventing the nuclear accumulation of Hog1 had no impact on C. albicans virulence in two distinct models of systemic infection. However, tethering Hog1 to the plasma membrane did impact on signal fidelity, and on the magnitude and kinetics of the stress-induced phosphorylation of this SAPK. Taken together, these findings challenge the dogma that nuclear accumulation of SAPKs is a pre-requisite for SAPK-dependent gene expression, and reveal that stress-induced nuclear accumulation of Hog1 is dispensable for the virulence of a major human fungal pathogen.
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Affiliation(s)
- Alison M Day
- Institute for Cell and Molecular Biosciences, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Carmen M Herrero-de-Dios
- MRC Centre for Medical Mycology at the University of Aberdeen, Aberdeen Fungal Group, Institute of Medical Sciences, Aberdeen, AB25 2ZD, UK
| | - Donna M MacCallum
- MRC Centre for Medical Mycology at the University of Aberdeen, Aberdeen Fungal Group, Institute of Medical Sciences, Aberdeen, AB25 2ZD, UK
| | - Alistair J P Brown
- MRC Centre for Medical Mycology at the University of Aberdeen, Aberdeen Fungal Group, Institute of Medical Sciences, Aberdeen, AB25 2ZD, UK
| | - Janet Quinn
- Institute for Cell and Molecular Biosciences, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK.
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200
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Nguyen TD, Walker ME, Gardner JM, Jiranek V. Appropriate vacuolar acidification in Saccharomyces cerevisiae is associated with efficient high sugar fermentation. Food Microbiol 2017; 70:262-268. [PMID: 29173635 DOI: 10.1016/j.fm.2017.09.021] [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: 02/28/2017] [Revised: 08/05/2017] [Accepted: 09/29/2017] [Indexed: 01/01/2023]
Abstract
Vacuolar acidification serves as a homeostatic mechanism to regulate intracellular pH, ion and chemical balance, as well as trafficking and recycling of proteins and nutrients, critical for normal cellular function. This study reports on the importance of vacuole acidification during wine-like fermentation. Ninety-three mutants (homozygous deletions in lab yeast strain, BY4743), which result in protracted fermentation when grown in a chemically defined grape juice with 200 g L-1 sugar (pH 3.5), were examined to determine whether fermentation protraction was in part due to a dysfunction in vacuolar acidification (VA) during the early stages of fermentation, and whether VA was responsive to the initial sugar concentration in the medium. Cells after 24 h growth were dual-labelled with propidium iodide and vacuolar specific probe 6-carboxyfluorescein diacetate (6-CFDA) and examined with a FACS analyser for viability and impaired VA, respectively. Twenty mutants showed a greater than two-fold increase in fluorescence intensity; the experimental indicator for vacuolar dysfunction; 10 of which have not been previously annotated to this process. With the exception of Δhog1, Δpbs2 and Δvph1 mutants, where dysfunction was directly related to osmolality; the remainder exhibited increased CF-fluorescence, independent of sugar concentration at 20 g L-1 or 200 g L-1. These findings offer insight to the importance of VA to cell growth in high sugar media.
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Affiliation(s)
- Trung D Nguyen
- School of Agriculture, Food and Wine, The University of Adelaide, PMB 1 Glen Osmond, SA 5064, Australia; Wine Innovation Cluster, Adelaide, South Australia, Australia
| | - Michelle E Walker
- School of Agriculture, Food and Wine, The University of Adelaide, PMB 1 Glen Osmond, SA 5064, Australia; Wine Innovation Cluster, Adelaide, South Australia, Australia
| | - Jennifer M Gardner
- School of Agriculture, Food and Wine, The University of Adelaide, PMB 1 Glen Osmond, SA 5064, Australia; Wine Innovation Cluster, Adelaide, South Australia, Australia
| | - Vladimir Jiranek
- School of Agriculture, Food and Wine, The University of Adelaide, PMB 1 Glen Osmond, SA 5064, Australia; Wine Innovation Cluster, Adelaide, South Australia, Australia; Australian Research Council Training Centre for Innovative Wine Production, Australia.
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