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Iyer R, Bhat PJ. Trehalose biosynthetic pathway regulates filamentation response in Saccharomyces cerevisiae. Mol Biol Rep 2022. [PMID: 35908239 DOI: 10.1007/s11033-022-07792-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 07/12/2022] [Indexed: 10/16/2022]
Abstract
BACKGROUND Diploid cells of Saccharomyces cerevisiae undergo either pseudohyphal differentiation or sporulation in response to depletion of carbon and nitrogen sources. Distinct signaling pathways regulate filamentation and sporulation in response to nutrient limitation. How these pathways are coordinated for implementing distinct cell fate decisions in response to similar nutritional cues is an enigma. Although the role of trehalose pathway in sporulation has been extensively studied, it's possible role in pseudohyphal differentiation has been unexplored. METHODS AND RESULTS Briefly, tps1 and tps2 mutants were tested for their ability to form pseudohyphae independently as well as in the background of GPR1 and RAS2 mutations. Here, we demonstrate that disruption of TPS1 but not TPS2 inhibits pseudohyphae formation. Interestingly, deletion of GPR1 suppresses the above defect. Further genetic analysis revealed that TPS1 and TPS2 exert opposing effects in triggering filamentation. CONCLUSION We provide new insights into the role of an otherwise well-known pathway of trehalose biosynthesis in pseudohyphal differentiation. Based on additional data we propose that downstream signaling, mediated by cAMP may be modulated by nutrient mediated differential regulation of RAS2 by TPS1 and TPS2.
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Zacharaki V, Ponnu J, Crepin N, Langenecker T, Hagmann J, Skorzinski N, Musialak‐Lange M, Wahl V, Rolland F, Schmid M. Impaired KIN10 function restores developmental defects in the Arabidopsis trehalose 6-phosphate synthase1 ( tps1) mutant. New Phytol 2022; 235:220-233. [PMID: 35306666 PMCID: PMC9320823 DOI: 10.1111/nph.18104] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 03/09/2022] [Indexed: 05/19/2023]
Abstract
Sensing carbohydrate availability is essential for plants to coordinate their growth and development. In Arabidopsis thaliana, TREHALOSE 6-PHOSPHATE SYNTHASE 1 (TPS1) and its product, trehalose 6-phosphate (T6P), are important for the metabolic control of development. tps1 mutants are embryo-lethal and unable to flower when embryogenesis is rescued. T6P regulates development in part through inhibition of SUCROSE NON-FERMENTING1 RELATED KINASE1 (SnRK1). Here, we explored the role of SnRK1 in T6P-mediated plant growth and development using a combination of a mutant suppressor screen and genetic, cellular and transcriptomic approaches. We report nonsynonymous amino acid substitutions in the catalytic KIN10 and regulatory SNF4 subunits of SnRK1 that can restore both embryogenesis and flowering of tps1 mutant plants. The identified SNF4 point mutations disrupt the interaction with the catalytic subunit KIN10. Contrary to the common view that the two A. thaliana SnRK1 catalytic subunits act redundantly, we found that loss-of-function mutations in KIN11 are unable to restore embryogenesis and flowering, highlighting the important role of KIN10 in T6P signalling.
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Affiliation(s)
- Vasiliki Zacharaki
- Department of Plant PhysiologyUmeå Plant Science CentreUmeå UniversitySE‐901 87UmeåSweden
| | - Jathish Ponnu
- Department of Molecular BiologyMax Planck Institute for Developmental BiologySpemannstr. 3572076TübingenGermany
- Institute for Plant SciencesCologne BiocenterUniversität zu KölnZülpicher Straße 47b50674KölnGermany
| | - Nathalie Crepin
- Laboratory for Molecular Plant BiologyBiology DepartmentUniversity of Leuven–KU LeuvenKasteelpark Arenberg 313001Heverlee‐LeuvenBelgium
- KU Leuven Plant Institute (LPI)3001Heverlee‐LeuvenBelgium
| | - Tobias Langenecker
- Department of Molecular BiologyMax Planck Institute for Developmental BiologySpemannstr. 3572076TübingenGermany
| | - Jörg Hagmann
- Department of Molecular BiologyMax Planck Institute for Developmental BiologySpemannstr. 3572076TübingenGermany
| | - Noemi Skorzinski
- Department of Plant PhysiologyUmeå Plant Science CentreUmeå UniversitySE‐901 87UmeåSweden
- Department of Molecular BiologyMax Planck Institute for Developmental BiologySpemannstr. 3572076TübingenGermany
| | - Magdalena Musialak‐Lange
- Department of Plant Reproductive Biology and EpigeneticsMax Planck Institute of Molecular Plant PhysiologyAm Mühlenberg 114476PotsdamGermany
| | - Vanessa Wahl
- Department of Plant Reproductive Biology and EpigeneticsMax Planck Institute of Molecular Plant PhysiologyAm Mühlenberg 114476PotsdamGermany
| | - Filip Rolland
- Laboratory for Molecular Plant BiologyBiology DepartmentUniversity of Leuven–KU LeuvenKasteelpark Arenberg 313001Heverlee‐LeuvenBelgium
- KU Leuven Plant Institute (LPI)3001Heverlee‐LeuvenBelgium
| | - Markus Schmid
- Department of Plant PhysiologyUmeå Plant Science CentreUmeå UniversitySE‐901 87UmeåSweden
- Department of Molecular BiologyMax Planck Institute for Developmental BiologySpemannstr. 3572076TübingenGermany
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Arabaciyan S, Saint-Antoine M, Maugis-Rabusseau C, François JM, Singh A, Parrou JL, Capp JP. Insights on the Control of Yeast Single-Cell Growth Variability by Members of the Trehalose Phosphate Synthase (TPS) Complex. Front Cell Dev Biol 2021; 9:607628. [PMID: 33585476 PMCID: PMC7876269 DOI: 10.3389/fcell.2021.607628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 01/06/2021] [Indexed: 11/13/2022] Open
Abstract
Single-cell variability of growth is a biological phenomenon that has attracted growing interest in recent years. Important progress has been made in the knowledge of the origin of cell-to-cell heterogeneity of growth, especially in microbial cells. To better understand the origins of such heterogeneity at the single-cell level, we developed a new methodological pipeline that coupled cytometry-based cell sorting with automatized microscopy and image analysis to score the growth rate of thousands of single cells. This allowed investigating the influence of the initial amount of proteins of interest on the subsequent growth of the microcolony. As a preliminary step to validate this experimental setup, we referred to previous findings in yeast where the expression level of Tsl1, a member of the Trehalose Phosphate Synthase (TPS) complex, negatively correlated with cell division rate. We unfortunately could not find any influence of the initial TSL1 expression level on the growth rate of the microcolonies. We also analyzed the effect of the natural variations of trehalose-6-phosphate synthase (TPS1) expression on cell-to-cell growth heterogeneity, but we did not find any correlation. However, due to the already known altered growth of the tps1Δ mutants, we tested this strain at the single-cell level on a permissive carbon source. This mutant showed an outstanding lack of reproducibility of growth rate distributions as compared to the wild-type strain, with variable proportions of non-growing cells between cultivations and more heterogeneous microcolonies in terms of individual growth rates. Interestingly, this variable behavior at the single-cell level was reminiscent to the high variability that is also stochastically suffered at the population level when cultivating this tps1Δ strain, even when using controlled bioreactors.
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Affiliation(s)
| | - Michael Saint-Antoine
- Electrical and Computer Engineering & Biomedical Engineering, University of Delaware, Newark, DE, United States
| | - Cathy Maugis-Rabusseau
- Institut de Mathématiques de Toulouse, UMR5219, Université de Toulouse, CNRS, INSA, Toulouse, France
| | | | - Abhyudai Singh
- Electrical and Computer Engineering & Biomedical Engineering, University of Delaware, Newark, DE, United States
| | - Jean-Luc Parrou
- TBI, Université de Toulouse, CNRS, INRAE INSA, Toulouse, France
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Van Leemputte F, Vanthienen W, Wijnants S, Van Zeebroeck G, Thevelein JM. Aberrant Intracellular pH Regulation Limiting Glyceraldehyde-3-Phosphate Dehydrogenase Activity in the Glucose-Sensitive Yeast tps1Δ Mutant. mBio 2020; 11:e02199-20. [PMID: 33109759 DOI: 10.1128/mBio.02199-20] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Glucose catabolism is the backbone of metabolism in most organisms. In spite of numerous studies and extensive knowledge, major controls on glycolysis and its connections to the other metabolic pathways remain to be discovered. A striking example is provided by the extreme glucose sensitivity of the yeast tps1Δ mutant, which undergoes apoptosis in the presence of just a few millimolar glucose. Previous work has shown that the conspicuous glucose-induced hyperaccumulation of the glycolytic metabolite fructose-1,6-bisphosphate (Fru1,6bisP) in tps1Δ cells triggers apoptosis through activation of the Ras-cAMP-protein kinase A (PKA) signaling pathway. However, the molecular cause of this Fru1,6bisP hyperaccumulation has remained unclear. We now provide evidence that the persistent drop in intracellular pH upon glucose addition to tps1Δ cells likely compromises the activity of glyceraldehyde-3-phosphate dehydrogenase (GAPDH), a major glycolytic enzyme downstream of Fru1,6bisP, due to its unusually high pH optimum. Our work highlights the potential importance of intracellular pH fluctuations for control of major metabolic pathways. Whereas the yeast Saccharomyces cerevisiae shows great preference for glucose as a carbon source, a deletion mutant in trehalose-6-phosphate synthase, tps1Δ, is highly sensitive to even a few millimolar glucose, which triggers apoptosis and cell death. Glucose addition to tps1Δ cells causes deregulation of glycolysis with hyperaccumulation of metabolites upstream and depletion downstream of glyceraldehyde-3-phosphate dehydrogenase (GAPDH). The apparent metabolic barrier at the level of GAPDH has been difficult to explain. We show that GAPDH isozyme deletion, especially Tdh3, further aggravates glucose sensitivity and metabolic deregulation of tps1Δ cells, but overexpression does not rescue glucose sensitivity. GAPDH has an unusually high pH optimum of 8.0 to 8.5, which is not altered by tps1Δ. Whereas glucose causes short, transient intracellular acidification in wild-type cells, in tps1Δ cells, it causes permanent intracellular acidification. The hxk2Δ and snf1Δ suppressors of tps1Δ restore the transient acidification. These results suggest that GAPDH activity in the tps1Δ mutant may be compromised by the persistently low intracellular pH. Addition of NH4Cl together with glucose at high extracellular pH to tps1Δ cells abolishes the pH drop and reduces glucose-6-phosphate (Glu6P) and fructose-1,6-bisphosphate (Fru1,6bisP) hyperaccumulation. It also reduces the glucose uptake rate, but a similar reduction in glucose uptake rate in a tps1Δ hxt2,4,5,6,7Δ strain does not prevent glucose sensitivity and Fru1,6bisP hyperaccumulation. Hence, our results suggest that the glucose-induced intracellular acidification in tps1Δ cells may explain, at least in part, the apparent glycolytic bottleneck at GAPDH but does not appear to fully explain the extreme glucose sensitivity of the tps1Δ mutant.
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Ahsan MU, Hayward A, Alam M, Bandaralage JH, Topp B, Beveridge CA, Mitter N. Scion control of miRNA abundance and tree maturity in grafted avocado. BMC Plant Biol 2019; 19:382. [PMID: 31481026 PMCID: PMC6724330 DOI: 10.1186/s12870-019-1994-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 08/27/2019] [Indexed: 05/24/2023]
Abstract
BACKGROUND Grafting is the common propagation method for avocado and primarily benefits orchard production by reducing the time to tree productivity. It also allows use of scions and rootstocks specifically selected for improved productivity and commercial acceptance. Rootstocks in avocado may be propagated from mature tree cuttings ('mature'), or from seed ('juvenile'). While the use of mature scion material hastens early bearing/maturity and economic return, the molecular factors involved in the role of the scion and/or rootstock in early bearing/reduced juvenility of the grafted tree are still unknown. RESULTS Here, we utilized juvenility and flowering associated miRNAs; miR156 and miR172 and their putative target genes to screen pre-graft and post-graft material in different combinations from avocado. The abundance of mature miR156, miR172 and the miR156 target gene SPL4, showed a strong correlation to the maturity of the scion and rootstock material in avocado. Graft transmissibility of miR156 and miR172 has been explored in annual plants. Here, we show that the scion may be responsible for grafted tree maturity involving these factors, while the rootstock maturity does not significantly influence miRNA abundance in the scion. We also demonstrate that the presence of leaves on cutting rootstocks supports graft success and contributes towards intergraft signalling involving the carbohydrate-marker TPS1. CONCLUSION Here, we suggest that the scion largely controls the molecular 'maturity' of grafted avocado trees, however, leaves on the rootstock not only promote graft success, but can influence miRNA and mRNA abundance in the scion. This constitutes the first study on scion and rootstock contribution towards grafted tree maturity using the miR156-SPL4-miR172 regulatory module as a marker for juvenility and reproductive competence.
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Affiliation(s)
- Muhammad Umair Ahsan
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland 4072 Australia
| | - Alice Hayward
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland 4072 Australia
| | - Mobashwer Alam
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland 4072 Australia
| | - Jayeni Hiti Bandaralage
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland 4072 Australia
| | - Bruce Topp
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland 4072 Australia
| | - Christine Anne Beveridge
- School of Biological Sciences, The University of Queensland, St. Lucia, Brisbane, Queensland 4072 Australia
| | - Neena Mitter
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland 4072 Australia
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6
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Ahsan MU, Hayward A, Alam M, Bandaralage JH, Topp B, Beveridge CA, Mitter N. Scion control of miRNA abundance and tree maturity in grafted avocado. BMC Plant Biol 2019; 19:382. [PMID: 31481026 DOI: 10.1186/s12870-019-1994-1995] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 08/27/2019] [Indexed: 05/23/2023]
Abstract
BACKGROUND Grafting is the common propagation method for avocado and primarily benefits orchard production by reducing the time to tree productivity. It also allows use of scions and rootstocks specifically selected for improved productivity and commercial acceptance. Rootstocks in avocado may be propagated from mature tree cuttings ('mature'), or from seed ('juvenile'). While the use of mature scion material hastens early bearing/maturity and economic return, the molecular factors involved in the role of the scion and/or rootstock in early bearing/reduced juvenility of the grafted tree are still unknown. RESULTS Here, we utilized juvenility and flowering associated miRNAs; miR156 and miR172 and their putative target genes to screen pre-graft and post-graft material in different combinations from avocado. The abundance of mature miR156, miR172 and the miR156 target gene SPL4, showed a strong correlation to the maturity of the scion and rootstock material in avocado. Graft transmissibility of miR156 and miR172 has been explored in annual plants. Here, we show that the scion may be responsible for grafted tree maturity involving these factors, while the rootstock maturity does not significantly influence miRNA abundance in the scion. We also demonstrate that the presence of leaves on cutting rootstocks supports graft success and contributes towards intergraft signalling involving the carbohydrate-marker TPS1. CONCLUSION Here, we suggest that the scion largely controls the molecular 'maturity' of grafted avocado trees, however, leaves on the rootstock not only promote graft success, but can influence miRNA and mRNA abundance in the scion. This constitutes the first study on scion and rootstock contribution towards grafted tree maturity using the miR156-SPL4-miR172 regulatory module as a marker for juvenility and reproductive competence.
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Affiliation(s)
- Muhammad Umair Ahsan
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Alice Hayward
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Mobashwer Alam
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Jayeni Hiti Bandaralage
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Bruce Topp
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Christine Anne Beveridge
- School of Biological Sciences, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Neena Mitter
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia.
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7
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Hwang G, Kim S, Cho JY, Paik I, Kim JI, Oh E. Trehalose-6-phosphate signaling regulates thermoresponsive hypocotyl growth in Arabidopsis thaliana. EMBO Rep 2019; 20:e47828. [PMID: 31393060 DOI: 10.15252/embr.201947828] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 06/26/2019] [Accepted: 07/12/2019] [Indexed: 12/30/2022] Open
Abstract
Growth plasticity is a key mechanism by which plants adapt to the ever-changing environmental conditions. Since growth is a high-energy-demanding and irreversible process, it is expected to be regulated by the integration of endogenous energy status as well as environmental conditions. Here, we show that trehalose-6-phosphate (T6P) functions as a sugar signaling molecule that coordinates thermoresponsive hypocotyl growth with endogenous sugar availability. We found that the loss of T6P SYNTHASE 1 (TPS1) in Arabidopsis thaliana impaired high-temperature-mediated hypocotyl growth. Consistently, the activity of PIF4, a transcription factor that positively regulates hypocotyl growth, was compromised in the tps1 mutant. We further show that, in the tps1 mutant, a sugar signaling kinase KIN10 directly phosphorylates and destabilizes PIF4. T6P inhibits KIN10 activity in a GRIK-dependent manner, allowing PIF4 to promote hypocotyl growth at high temperatures. Together, our results demonstrate that T6P determines thermoresponsive growth through the KIN10-PIF4 signaling module. Such regulation of PIF4 by T6P integrates the temperature-signaling pathway with the endogenous sugar status, thus optimizing plant growth response to environmental stresses.
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Affiliation(s)
- Geonhee Hwang
- Department of Life Sciences, Korea University, Seoul, Korea
| | - Sara Kim
- Department of Life Sciences, Korea University, Seoul, Korea
| | - Jae-Yong Cho
- Department of Biotechnology and Kumho Life Science Laboratory, Chonnam National University, Gwangju, Korea
| | - Inyup Paik
- Department of Molecular Biosciences, The Institute for Cellular and Molecular Biology, University of Texas, Austin, TX, USA
| | - Jeong-Il Kim
- Department of Biotechnology and Kumho Life Science Laboratory, Chonnam National University, Gwangju, Korea
| | - Eunkyoo Oh
- Department of Life Sciences, Korea University, Seoul, Korea
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8
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Abstract
Transient exposures to environmental stresses induce altered physiological states in exposed cells that persist after the stresses have been removed. These states, referred to as cellular memory, can even be passed on to daughter cells and may thus be thought of as embodying a form of epigenetic inheritance. We find that meiotically produced spores in the budding yeast S. cerevisiae possess a state of heightened stress resistance that, following their germination, persists for numerous mitotic generations. As yeast meiotic development is essentially a starvation response that a/alpha diploid cells engage, we sought to model this phenomenon by subjecting haploid cells to starvation conditions. We find also that haploid cells exposed to glucose withdrawal acquire a state of elevated stress resistance that persists after the reintroduction of these cells to glucose-replete media. Following release from lengthy durations of glucose starvation, we confirm that this physiological state of enhanced stress resistance is propagated in descendants of the exposed cells through two mitotic divisions before fading from the population. In both haploid starved cells and diploid produced meiotic spores we show that their cellular memories are not attributable to trehalose, a widely regarded stress protectant that accumulates in these cell types. Moreover, the transiently heritable stress resistant state induced by glucose starvation in haploid cells is independent of the Msn2/4 transcription factors, which are known to program cellular memory induced by exposure of cells to NaCl. Our findings identify new developmentally and nutritionally induced states of cellular memory that exhibit striking degrees of persistence and mitotic heritability.
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Affiliation(s)
- Heldder Gutierrez
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A8, Canada
| | - Bakhtiyar Taghizada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A8, Canada
| | - Marc D Meneghini
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A8, Canada
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Vicente RL, Spina L, Gómez JPL, Dejean S, Parrou JL, François JM. Trehalose-6-phosphate promotes fermentation and glucose repression in Saccharomyces cerevisiae. Microb Cell 2018; 5:444-459. [PMID: 30386789 PMCID: PMC6206404 DOI: 10.15698/mic2018.10.651] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The yeast trehalose-6-phosphate synthase (Tps1) catalyzes the formation of trehalose-6-phosphate (T6P) in trehalose synthesis. Besides, Tps1 plays a key role in carbon and energy homeostasis in this microbial cell, as shown by the well documented loss of ATP and hyper accumulation of sugar phosphates in response to glucose addition in a mutant defective in this protein. The inability of a Saccharomyces cerevisiae tps1 mutant to cope with fermentable sugars is still a matter of debate. We reexamined this question through a quantitative analysis of the capability of TPS1 homologues from different origins to complement phenotypic defects of this mutant. Our results allowed to classify this complementation in three groups. A first group enclosed TPS1 of Klyveromyces lactis with that of S. cerevisiae as their expression in Sctps1 cells fully recovered wild type metabolic patterns and fermentation capacity in response to glucose. At the opposite was the group with TPS1 homologues from the bacteria Escherichia coli and Ralstonia solanacearum, the plant Arabidopsis thaliana and the insect Drosophila melanogaster whose metabolic profiles were comparable to those of a tps1 mutant, notably with almost no accumulation of T6P, strong impairment of ATP recovery and potent reduction of fermentation capacity, albeit these homologous genes were able to rescue growth of Sctps1 on glucose. In between was a group consisting of TPS1 homologues from other yeast species and filamentous fungi characterized by 5 to 10 times lower accumulation of T6P, a weaker recovery of ATP and a 3-times lower fermentation capacity than wild type. Finally, we found that glucose repression of gluconeogenic genes was strongly dependent on T6P. Altogether, our results suggest that the TPS protein is indispensable for growth on fermentable sugars, and points to a critical role of T6P as a sensing molecule that promotes sugar fermentation and glucose repression.
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Affiliation(s)
- Rebeca L Vicente
- LISBP; UMR INSA-CNRS 5504 & INRA 792; Toulouse, France.,Fundación Alfonso Martín Escudero; Madrid, Spain
| | - Lucie Spina
- LISBP; UMR INSA-CNRS 5504 & INRA 792; Toulouse, France
| | | | - Sebastien Dejean
- Institut de Mathématiques de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France
| | | | - Jean Marie François
- LISBP; UMR INSA-CNRS 5504 & INRA 792; Toulouse, France.,Toulouse White Biotechnology Center, UMS INSA-INRA-CNRS, F-31520 Ramonville
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10
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Lei M, Wu X, Zhang J, Wang H, Huang C. Gene cloning, expression, and characterization of trehalose-6-phosphate synthase from Pleurotus ostreatus. J Basic Microbiol 2017; 57:580-589. [PMID: 28513878 DOI: 10.1002/jobm.201700120] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 04/22/2017] [Accepted: 04/30/2017] [Indexed: 02/05/2023]
Abstract
Trehalose-6-phosphate synthase (TPS; EC2.4.1.15) catalyzes the first step in trehalose synthesis, which involves transfer of glucose from uridine diphosphate glucose (UDPG) to glucose 6-phosphate (G6P) to form trehalose-6-phosphate. To determine the gene and enzymatic characteristics of TPS in Pleurotus ostreatus, we cloned and sequenced the cDNA of PoTPS1, which contains a 1665 bp open reading frame that encodes a 554-amino acid protein with a predicted molecular weight of 62.01 kDa. This gene was expressed in Escherichia coli BL21 and then the recombinant protein was purified and characterized. Results showed that the optimum pH and temperature for the recombinant PoTPS1 were 7.4 and 30 °C, respectively; the Km value against G6P and UDPG were 0.14 and 0.17 mM, respectively, and the Vmax and Kcat values were 91.86 nkat/g and 5.89 s-1 , respectively. Trehalose content was as high as 158.88 mg g-1 dry weight after heat treatment at 40 °C for 15 h, which was consistent with highest TPS1 activity at that time point. This result indicated that PoTPS1 was responsible for trehalose synthesis in P. ostreatus.
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Affiliation(s)
- Min Lei
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, P.R. China.,Key Laboratory of Microbial Resources, Ministry of Agriculture, Beijing, P.R. China.,Department of Microbiology, State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing, P.R. China
| | - Xiangli Wu
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, P.R. China.,Key Laboratory of Microbial Resources, Ministry of Agriculture, Beijing, P.R. China
| | - Jinxia Zhang
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, P.R. China.,Key Laboratory of Microbial Resources, Ministry of Agriculture, Beijing, P.R. China
| | - Hexiang Wang
- Department of Microbiology, State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing, P.R. China
| | - Chenyang Huang
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, P.R. China.,Key Laboratory of Microbial Resources, Ministry of Agriculture, Beijing, P.R. China
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