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Huang LK, Huang YC, Chen PC, Lee CH, Lin SM, Hsu YHH, Pan RL. Exploration of the Catalytic Cycle Dynamics of Vigna Radiata H +-Translocating Pyrophosphatases Through Hydrogen-Deuterium Exchange Mass Spectrometry. J Membr Biol 2023; 256:443-458. [PMID: 37955797 DOI: 10.1007/s00232-023-00295-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 10/11/2023] [Indexed: 11/14/2023]
Abstract
Vigna radiata H+-translocating pyrophosphatases (VrH+-PPases, EC 3.6.1.1) are present in various endomembranes of plants, bacteria, archaea, and certain protozoa. They transport H+ into the lumen by hydrolyzing pyrophosphate, which is a by-product of many essential anabolic reactions. Although the crystal structure of H+-PPases has been elucidated, the H+ translocation mechanism of H+-PPases in the solution state remains unclear. In this study, we used hydrogen-deuterium exchange (HDX) coupled with mass spectrometry (MS) to investigate the dynamics of H+-PPases between the previously proposed R state (resting state, Apo form), I state (intermediate state, bound to a substrate analog), and T state (transient state, bound to inorganic phosphate). When hydrogen was replaced by proteins in deuterium oxide solution, the backbone hydrogen atoms, which were exchanged with deuterium, were identified through MS. Accordingly, we used deuterium uptake to examine the structural dynamics and conformational changes of H+-PPases in solution. In the highly conserved substrate binding and proton exit regions, HDX-MS revealed the existence of a compact conformation with deuterium exchange when H+-PPases were bound with a substrate analog and product. Thus, a novel working model was developed to elucidate the in situ catalytic mechanism of pyrophosphate hydrolysis and proton transport. In this model, a proton is released in the I state, and the TM5 inner wall serves as a proton piston.
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Affiliation(s)
- Li-Kun Huang
- Department of Life Science and Institute of Bioinformatics and Structural Biology, College of Life Science, National Tsing Hua University, No.101, Sec. 2, Kuangfu Rd., Hsinchu City, 30013, Taiwan, Republic of China
| | - Yi-Cyuan Huang
- Department of Chemistry, Tunghai University, No.1727, Sec. 4, Taiwan Boulevard, Taichung, 40704, Taiwan, Republic of China
| | - Pin-Chuan Chen
- Department of Life Science and Institute of Bioinformatics and Structural Biology, College of Life Science, National Tsing Hua University, No.101, Sec. 2, Kuangfu Rd., Hsinchu City, 30013, Taiwan, Republic of China
| | - Ching-Hung Lee
- Department of Life Science and Institute of Bioinformatics and Structural Biology, College of Life Science, National Tsing Hua University, No.101, Sec. 2, Kuangfu Rd., Hsinchu City, 30013, Taiwan, Republic of China
| | - Shih-Ming Lin
- Department of Biotechnology and Bioindustry Sciences, National Cheng Kung University, Tainan, 70101, Taiwan, Republic of China
| | - Yuan-Hao Howard Hsu
- Department of Chemistry, Tunghai University, No.1727, Sec. 4, Taiwan Boulevard, Taichung, 40704, Taiwan, Republic of China.
| | - Rong-Long Pan
- Department of Life Science and Institute of Bioinformatics and Structural Biology, College of Life Science, National Tsing Hua University, No.101, Sec. 2, Kuangfu Rd., Hsinchu City, 30013, Taiwan, Republic of China.
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Ghassemi-Golezani K, Abdoli S. Improving ATPase and PPase activities, nutrient uptake and growth of salt stressed ajowan plants by salicylic acid and iron-oxide nanoparticles. Plant Cell Rep 2021; 40:559-573. [PMID: 33403499 DOI: 10.1007/s00299-020-02652-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 09/18/2020] [Accepted: 12/14/2020] [Indexed: 05/27/2023]
Abstract
Salicylic acid and iron-oxide nanoparticles alleviated salt toxicity and improved plant growth by stimulating the activities of H+-ATPase and H+-PPase and preventing nutrient imbalance. Two factorial experiments were undertaken in a greenhouse during 2018 and 2019, to evaluate the impacts of SA (1 mM) and nano-Fe2O3 (3 mM) sprays at 7 leaves and flowering stages on vacuolar H+-pumps, growth and essential oil of salt-subjected (0, 4, 8 and 12 dS m-1 NaCl) ajowan plants. Measurements of plant traits were started at about 12 days after the last foliar spray and continued up to maturity. The H+-ATPase and H+-PPase activities and root ATP content were enhanced under low salinity, but higher salinities reduced these parameters. Rising salinity enhanced Na uptake and translocation, endogenous SA and DPPH activity, while reduced K+/Na+ ratio and nutrients uptake, leading to a reduction in plant biomass. Treatment with SA, nano-Fe2O3 and their combination improved H+-pumps activities and ATP content in roots and leaves. The SA-related treatments caused the highest activities of H+-pumps in roots, but Fe-related treatments resulted in the highest activities of these pumps in leaves. Increasing H+-pumps activities reduced sodium uptake and translocation and enhanced nutrients uptake. Foliar treatments, especially SA + nano-Fe2O3 augmented endogenous SA, DPPH activity, and plant growth in salt-stressed plants. Essential oil contents of vegetative and inflorescence organs under severe salinity and seeds under moderate and severe salinities were enhanced. Maximum essential oil was obtained from seeds of SA + nano-Fe2O3-treated plants, which was strongly correlated with endogenous SA and DPPH. Nevertheless, the SA + nano-Fe2O3 was the best treatment for diminishing salt toxicity and improving ajowan plant growth and essential oil production.
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Affiliation(s)
- Kazem Ghassemi-Golezani
- Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
| | - Soheila Abdoli
- Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
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Gunji S, Oda Y, Takigawa-Imamura H, Tsukaya H, Ferjani A. Excess Pyrophosphate Restrains Pavement Cell Morphogenesis and Alters Organ Flatness in Arabidopsis thaliana. Front Plant Sci 2020; 11:31. [PMID: 32153602 PMCID: PMC7047283 DOI: 10.3389/fpls.2020.00031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 01/13/2020] [Indexed: 05/31/2023]
Abstract
In Arabidopsis thaliana, the vacuolar proton-pumping pyrophosphatase (H+-PPase) is highly expressed in young tissues, which consume large amounts of energy in the form of nucleoside triphosphates and produce pyrophosphate (PPi) as a byproduct. We reported that excess PPi in the H+-PPase loss-of-function fugu5 mutant severely compromised gluconeogenesis from seed storage lipids, arrested cell division in cotyledonary palisade tissue, and triggered compensated cell enlargement; this phenotype was recovered upon sucrose supply. Thus, we provided evidence that the hydrolysis of inhibitory PPi, rather than vacuolar acidification, is the major contribution of H+-PPase during seedling establishment. Here, examination of the epidermis revealed that fugu5 pavement cells exhibited defective puzzle-cell formation. Importantly, removal of PPi from fugu5 background by the yeast cytosolic PPase IPP1, in fugu5-1 AVP1pro::IPP1 transgenic lines, restored the phenotypic aberrations of fugu5 pavement cells. Surprisingly, pavement cells in mutants with defects in gluconeogenesis (pck1-2) or the glyoxylate cycle (icl-2; mls-2) showed no phenotypic alteration, indicating that reduced sucrose production from seed storage lipids is not the cause of fugu5 epidermal phenotype. fugu5 had oblong cotyledons similar to those of angustifolia-1 (an-1), whose leaf pavement cells display an abnormal arrangement of cortical microtubules (MTs). To gain insight into the genetic interaction between ANGUSTIFOLIA and H+-PPase in pavement cell differentiation, an-1 fugu5-1 was analyzed. Surprisingly, epidermis developmental defects were synergistically enhanced in the double mutant. In fact, an-1 fugu5-1 pavement cells showed a striking three-dimensional growth phenotype on both abaxial and adaxial sides of cotyledons, which was recovered by hydrolysis of PPi in an-1 fugu5-1 AVP1pro::IPP1. Live imaging revealed that cortical MTs exhibited a reduced velocity, were slightly fragmented and sparse in the above lines compared to the WT. Consistently, addition of PPi in vitro led to a dose-dependent delay of tubulin polymerization, thus supporting a link between PPi and MT dynamics. Moreover, mathematical simulation of three-dimensional growth based on cotyledon proximo-distal and medio-lateral phenotypic quantification implicated restricted cotyledon expansion along the medio-lateral axis in the crinkled surface of an-1 fugu5-1. Together, our data suggest that PPi homeostasis is a prerequisite for proper pavement cell morphogenesis, epidermal growth and development, and organ flattening.
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Affiliation(s)
- Shizuka Gunji
- United Graduate School of Education, Tokyo Gakugei University, Tokyo, Japan
| | - Yoshihisa Oda
- Department of Gene Function and Phenomics, National Institute of Genetics, Mishima, Japan
- Department of Genetics, The Graduate University for Advanced Studies, SOKENDAI, Mishima, Japan
| | - Hisako Takigawa-Imamura
- Department of Anatomy and Cell Biology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Hirokazu Tsukaya
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Ali Ferjani
- United Graduate School of Education, Tokyo Gakugei University, Tokyo, Japan
- Department of Biology, Tokyo Gakugei University, Tokyo, Japan
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Tsednee M, Castruita M, Salomé PA, Sharma A, Lewis BE, Schmollinger SR, Strenkert D, Holbrook K, Otegui MS, Khatua K, Das S, Datta A, Chen S, Ramon C, Ralle M, Weber PK, Stemmler TL, Pett-Ridge J, Hoffman BM, Merchant SS. Manganese co-localizes with calcium and phosphorus in Chlamydomonas acidocalcisomes and is mobilized in manganese-deficient conditions. J Biol Chem 2019; 294:17626-17641. [PMID: 31527081 DOI: 10.1074/jbc.ra119.009130] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [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: 04/29/2019] [Revised: 09/09/2019] [Indexed: 12/27/2022] Open
Abstract
Exposing cells to excess metal concentrations well beyond the cellular quota is a powerful tool for understanding the molecular mechanisms of metal homeostasis. Such improved understanding may enable bioengineering of organisms with improved nutrition and bioremediation capacity. We report here that Chlamydomonas reinhardtii can accumulate manganese (Mn) in proportion to extracellular supply, up to 30-fold greater than its typical quota and with remarkable tolerance. As visualized by X-ray fluorescence microscopy and nanoscale secondary ion MS (nanoSIMS), Mn largely co-localizes with phosphorus (P) and calcium (Ca), consistent with the Mn-accumulating site being an acidic vacuole, known as the acidocalcisome. Vacuolar Mn stores are accessible reserves that can be mobilized in Mn-deficient conditions to support algal growth. We noted that Mn accumulation depends on cellular polyphosphate (polyP) content, indicated by 1) a consistent failure of C. reinhardtii vtc1 mutant strains, which are deficient in polyphosphate synthesis, to accumulate Mn and 2) a drastic reduction of the Mn storage capacity in P-deficient cells. Rather surprisingly, X-ray absorption spectroscopy, EPR, and electron nuclear double resonance revealed that only little Mn2+ is stably complexed with polyP, indicating that polyP is not the final Mn ligand. We propose that polyPs are a critical component of Mn accumulation in Chlamydomonas by driving Mn relocation from the cytosol to acidocalcisomes. Within these structures, polyP may, in turn, escort vacuolar Mn to a number of storage ligands, including phosphate and phytate, and other, yet unidentified, compounds.
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Affiliation(s)
| | - Madeli Castruita
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095
| | - Patrice A Salomé
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095.,Institute for Genomics and Proteomics, UCLA, Los Angeles, California 90095
| | - Ajay Sharma
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Brianne E Lewis
- Department of Pharmaceutical Sciences, Wayne State University, Detroit, Michigan 48201
| | - Stefan R Schmollinger
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095.,Institute for Genomics and Proteomics, UCLA, Los Angeles, California 90095
| | - Daniela Strenkert
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095.,Institute for Genomics and Proteomics, UCLA, Los Angeles, California 90095
| | - Kristen Holbrook
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095
| | - Marisa S Otegui
- Departments of Botany and Genetics, University of Wisconsin, Madison, Wisconsin 53706
| | - Kaustav Khatua
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - Sayani Das
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - Ankona Datta
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - Si Chen
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439
| | - Christina Ramon
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550
| | - Martina Ralle
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon 97239
| | - Peter K Weber
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550
| | - Timothy L Stemmler
- Department of Pharmaceutical Sciences, Wayne State University, Detroit, Michigan 48201
| | - Jennifer Pett-Ridge
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550
| | - Brian M Hoffman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Sabeeha S Merchant
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095 .,Institute for Genomics and Proteomics, UCLA, Los Angeles, California 90095
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Bertolazi AA, de Souza SB, Ruas KF, Campostrini E, de Rezende CE, Cruz C, Melo J, Colodete CM, Varma A, Ramos AC. Inoculation With Piriformospora indica Is More Efficient in Wild-Type Rice Than in Transgenic Rice Over-Expressing the Vacuolar H +-PPase. Front Microbiol 2019; 10:1087. [PMID: 31156595 PMCID: PMC6530341 DOI: 10.3389/fmicb.2019.01087] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 02/13/2019] [Accepted: 04/30/2019] [Indexed: 12/19/2022] Open
Abstract
Achieving food security in a context of environmental sustainability is one of the main challenges of the XXI century. Two competing strategies to achieve this goal are the use of genetically modified plants and the use of plant growth promoting microorganisms (PGPMs). However, few studies assess the response of genetically modified plants to PGPMs. The aim of this study was to compare the response of over-expressing the vacuolar H+-PPase (AVP) and wild-type rice types to the endophytic fungus; Piriformospora indica. Oryza sativa plants (WT and AVP) were inoculated with P. indica and 30 days later, morphological, ecophysiological and bioenergetic parameters, and nutrient content were assessed. AVP and WT plant heights were strongly influenced by inoculation with P. indica, which also promoted increases in fresh and dry matter of shoot in both genotypes. This may be related with the stimulatory effect of P. indica on ecophysiological parameters, especially photosynthetic rate, stomatal conductance, intrinsic water use efficiency and carboxylation efficiency. However, there were differences between the genotypes concerning the physiological mechanisms leading to biomass increment. In WT plants, inoculation with P. indica stimulated all H+ pumps. However, in inoculated AVP plants, H+-PPase was stimulated, but P- and V-ATPases were inhibited. Fungal inoculation enhanced nutrient uptake in both shoots and roots of WT and AVP plants, compared to uninoculated plants; but among inoculated genotypes, the nutrient uptake was lower in AVP than in WT plants. These results clearly demonstrate that the symbiosis between P. indica and AVP plants did not benefit those plants, which may be related to the inefficient colonization of this fungus on the transgenic plants, demonstrating an incompatibility of this symbiosis, which needs to be further studied.
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Affiliation(s)
- Amanda Azevedo Bertolazi
- Laboratory of Environmental Microbiology and Biotechnology, Universidade Vila Velha (UVV), Vila Velha, Brazil
| | - Sávio Bastos de Souza
- Laboratory of Plant Physiology, CCTA, Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, Brazil
| | - Katherine Fraga Ruas
- Laboratory of Plant Physiology, CCTA, Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, Brazil
| | - Eliemar Campostrini
- Laboratory of Plant Physiology, CCTA, Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, Brazil
| | - Carlos Eduardo de Rezende
- Laboratory of Environmental Sciences, CBB, Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, Brazil
| | - Cristina Cruz
- Centre for Ecology, Evolution and Environmental Changes (Ce3C), Faculty of Sciences, Universidade de Lisboa, Campo Grande, Portugal
| | - Juliana Melo
- Centre for Ecology, Evolution and Environmental Changes (Ce3C), Faculty of Sciences, Universidade de Lisboa, Campo Grande, Portugal
| | - Carlos Moacir Colodete
- Laboratory of Environmental Microbiology and Biotechnology, Universidade Vila Velha (UVV), Vila Velha, Brazil
| | - Ajit Varma
- Amity Institute of Microbial Technology, Amity University, Noida, India
| | - Alessandro Coutinho Ramos
- Laboratory of Environmental Microbiology and Biotechnology, Universidade Vila Velha (UVV), Vila Velha, Brazil
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Gill MB, Zeng F, Shabala L, Böhm J, Zhang G, Zhou M, Shabala S. The ability to regulate voltage-gated K+-permeable channels in the mature root epidermis is essential for waterlogging tolerance in barley. J Exp Bot 2018; 69:667-680. [PMID: 29301054 PMCID: PMC5853535 DOI: 10.1093/jxb/erx429] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [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: 07/26/2017] [Accepted: 11/17/2017] [Indexed: 05/19/2023]
Abstract
Oxygen depletion under waterlogged conditions results in a compromised operation of H+-ATPase, with strong implications for membrane potential maintenance, cytosolic pH homeostasis, and transport of all nutrients across membranes. The above effects, however, are highly tissue specific and time dependent, and the causal link between hypoxia-induced changes to the cell's ionome and plant adaptive responses to hypoxia is not well established. This work aimed to fill this gap and investigate the effects of oxygen deprivation on K+ signalling and homeostasis in plants, and potential roles of GORK (depolarization-activated outward-rectifying potassium) channels in adaptation to oxygen-deprived conditions in barley. A significant K+ loss was observed in roots exposed to hypoxic conditions; this loss correlated with the cell's viability. Stress-induced K+ loss was stronger in the root apex immediately after stress onset, but became more pronounced in the root base as the stress progressed. The amount of K+ in shoots of plants grown in waterlogged soil correlated strongly with K+ flux under hypoxia measured in laboratory experiments. Hypoxia induced membrane depolarization; the severity of this depolarization was less pronounced in the tolerant group of cultivars. The expression of GORK was down-regulated by 1.5-fold in mature root but it was up-regulated by 10-fold in the apex after 48 h hypoxia stress. Taken together, our results suggest that the GORK channel plays a central role in K+ retention and signalling under hypoxia stress, and measuring hypoxia-induced K+ fluxes from the mature root zone may be used as a physiological marker to select waterlogging-tolerant varieties in breeding programmes.
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Affiliation(s)
- Muhammad Bilal Gill
- Department of Agronomy, Zhejiang University, Hangzhou, China
- School of Land and Food, University of Tasmania, Hobart, Tasmania, Australia
| | - Fanrong Zeng
- Department of Agronomy, Zhejiang University, Hangzhou, China
| | - Lana Shabala
- School of Land and Food, University of Tasmania, Hobart, Tasmania, Australia
| | - Jennifer Böhm
- School of Land and Food, University of Tasmania, Hobart, Tasmania, Australia
| | - Guoping Zhang
- Department of Agronomy, Zhejiang University, Hangzhou, China
| | - Meixue Zhou
- School of Land and Food, University of Tasmania, Hobart, Tasmania, Australia
| | - Sergey Shabala
- School of Land and Food, University of Tasmania, Hobart, Tasmania, Australia
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Pizzio GA, Hirschi KD, Gaxiola RA. Conjecture Regarding Posttranslational Modifications to the Arabidopsis Type I Proton-Pumping Pyrophosphatase (AVP1). Front Plant Sci 2017; 8:1572. [PMID: 28955362 PMCID: PMC5601048 DOI: 10.3389/fpls.2017.01572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 08/28/2017] [Indexed: 05/06/2023]
Abstract
Agbiotechnology uses genetic engineering to improve the output and value of crops. Altering the expression of the plant Type I Proton-pumping Pyrophosphatase (H+-PPase) has already proven to be a useful tool to enhance crop productivity. Despite the effective use of this gene in translational research, information regarding the intracellular localization and functional plasticity of the pump remain largely enigmatic. Using computer modeling several putative phosphorylation, ubiquitination and sumoylation target sites were identified that may regulate Arabidopsis H+-PPase (AVP1- Arabidopsis Vacuolar Proton-pump 1) subcellular trafficking and activity. These putative regulatory sites will direct future research that specifically addresses the partitioning and transport characteristics of this pump. We posit that fine-tuning H+-PPases activity and cellular distribution will facilitate rationale strategies for further genetic improvements in crop productivity.
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Affiliation(s)
- Gaston A. Pizzio
- Center for Research in Agricultural Genomics, Consejo Superior de Investigaciones CientíficasBarcelona, Spain
- *Correspondence: Gaston A. Pizzio, ; Roberto A. Gaxiola,
| | - Kendal D. Hirschi
- USDA ARS Children’s Nutrition Research Center, Baylor College of Medicine, HoustonTX, United States
| | - Roberto A. Gaxiola
- School of Life Sciences, Arizona State University, TempeAZ, United States
- *Correspondence: Gaston A. Pizzio, ; Roberto A. Gaxiola,
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Bao AK, Du BQ, Touil L, Kang P, Wang QL, Wang SM. Co-expression of tonoplast Cation/H(+) antiporter and H(+)-pyrophosphatase from xerophyte Zygophyllum xanthoxylum improves alfalfa plant growth under salinity, drought and field conditions. Plant Biotechnol J 2016; 14:964-75. [PMID: 26268400 DOI: 10.1111/pbi.12451] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [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: 04/21/2015] [Accepted: 07/10/2015] [Indexed: 05/20/2023]
Abstract
Salinity and drought are major environmental factors limiting the growth and productivity of alfalfa worldwide as this economically important legume forage is sensitive to these kinds of abiotic stress. In this study, transgenic alfalfa lines expressing both tonoplast NXH and H(+)-PPase genes, ZxNHX and ZxVP1-1 from the xerophyte Zygophyllum xanthoxylum L., were produced via Agrobacterium tumefaciens-mediated transformation. Compared with wild-type (WT) plants, transgenic alfalfa plants co-expressing ZxNHX and ZxVP1-1 grew better with greater plant height and dry mass under normal or stress conditions (NaCl or water-deficit) in the greenhouse. The growth performance of transgenic alfalfa plants was associated with more Na(+), K(+) and Ca(2+) accumulation in leaves and roots, as a result of co-expression of ZxNHX and ZxVP1-1. Cation accumulation contributed to maintaining intracellular ions homoeostasis and osmoregulation of plants and thus conferred higher leaf relative water content and greater photosynthesis capacity in transgenic plants compared to WT when subjected to NaCl or water-deficit stress. Furthermore, the transgenic alfalfa co-expressing ZxNHX and ZxVP1-1 also grew faster than WT plants under field conditions, and most importantly, exhibited enhanced photosynthesis capacity by maintaining higher net photosynthetic rate, stomatal conductance, and water-use efficiency than WT plants. Our results indicate that co-expression of tonoplast NHX and H(+)-PPase genes from a xerophyte significantly improved the growth of alfalfa, and enhanced its tolerance to high salinity and drought. This study laid a solid basis for reclaiming and restoring saline and arid marginal lands as well as improving forage yield in northern China.
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Affiliation(s)
- Ai-Ke Bao
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
| | - Bao-Qiang Du
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
- Lanzhou Animal Husbandry and Veterinary Institute, Lanzhou, China
| | - Leila Touil
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
- Laboratory of arid and oasis cropping, Institute of Arid Area (IRA), Medenine, Tunisia
| | - Peng Kang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
| | - Qiang-Long Wang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
| | - Suo-Min Wang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
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Yang Y, Liu Y, Yuan H, Liu X, Gao Y, Gong M, Zou Z. Membrane-bound pyrophosphatase of human gut microbe Clostridium methylpentosum confers improved salt tolerance in Escherichia coli, Saccharomyces cerevisiae and tobacco. Mol Membr Biol 2016; 33:39-50. [PMID: 29025361 DOI: 10.1080/09687688.2017.1370145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Membrane-bound pyrophosphatases (PPases) are involved in the adaption of organisms to stress conditions, which was substantiated by numerous plant transgenic studies with H+-PPase yet devoid of any correlated evidences for other two subfamilies, Na+-PPase and Na+,H+-PPase. Herein, we demonstrate the gene cloning and functional evaluation of the membrane-bound PPase (CmPP) of the human gut microbe Clostridium methylpentosum. The CmPP gene encodes a single polypeptide of 699 amino acids that was predicted as a multi-spanning membrane and K+-dependent Na+,H+-PPase. Heterologous expression of CmPP could significantly enhance the salt tolerance of both Escherichia coli and Saccharomyces cerevisiae, and this effect in yeast could be fortified by N-terminal addition of a vacuole-targeting signal peptide from the H+-PPase of Trypanosoma cruzi. Furthermore, introduction of CmPP could remarkably improve the salt tolerance of tobacco, implying its potential use in constructing salt-resistant transgenic crops. Consequently, the possible mechanisms of CmPP to underlie salt tolerance are discussed.
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Affiliation(s)
- Yumei Yang
- a School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy , Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology of Yunnan Province, Yunnan Normal University , Kunming , Yunnan , China
| | - Yanjuan Liu
- a School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy , Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology of Yunnan Province, Yunnan Normal University , Kunming , Yunnan , China
| | - Hang Yuan
- a School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy , Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology of Yunnan Province, Yunnan Normal University , Kunming , Yunnan , China
| | - Xian Liu
- a School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy , Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology of Yunnan Province, Yunnan Normal University , Kunming , Yunnan , China
| | - Yanxiu Gao
- a School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy , Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology of Yunnan Province, Yunnan Normal University , Kunming , Yunnan , China
| | - Ming Gong
- a School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy , Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology of Yunnan Province, Yunnan Normal University , Kunming , Yunnan , China
| | - Zhurong Zou
- a School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy , Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology of Yunnan Province, Yunnan Normal University , Kunming , Yunnan , China
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Katano M, Takahashi K, Hirano T, Kazama Y, Abe T, Tsukaya H, Ferjani A. Suppressor Screen and Phenotype Analyses Revealed an Emerging Role of the Monofunctional Peroxisomal Enoyl-CoA Hydratase 2 in Compensated Cell Enlargement. Front Plant Sci 2016; 7:132. [PMID: 26925070 PMCID: PMC4756126 DOI: 10.3389/fpls.2016.00132] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 01/25/2016] [Indexed: 05/02/2023]
Abstract
Efficient use of seed nutrient reserves is crucial for germination and establishment of plant seedlings. Mobilizing seed oil reserves in Arabidopsis involves β-oxidation, the glyoxylate cycle, and gluconeogenesis, which provide essential energy and the carbon skeletons needed to sustain seedling growth until photoautotrophy is acquired. We demonstrated that H(+)-PPase activity is required for gluconeogenesis. Lack of H(+)-PPase in fugu5 mutants increases cytosolic pyrophosphate (PPi) levels, which partially reduces sucrose synthesis de novo and inhibits cell division. In contrast, post-mitotic cell expansion in cotyledons was unusually enhanced, a phenotype called compensation. Therefore, it appears that PPi inhibits several cellular functions, including cell cycling, to trigger compensated cell enlargement (CCE). Here, we mutagenized fugu5-1 seeds with (12)C(6+) heavy-ion irradiation and screened mutations that restrain CCE to gain insight into the genetic pathway(s) involved in CCE. We isolated A#3-1, in which cell size was severely reduced, but cell number remained similar to that of original fugu5-1. Moreover, cell number decreased in A#3-1 single mutant (A#3-1sm), similar to that of fugu5-1, but cell size was almost equal to that of the wild type. Surprisingly, A#3-1 mutation did not affect CCE in other compensation exhibiting mutant backgrounds, such as an3-4 and fugu2-1/fas1-6. Subsequent map-based cloning combined with genome sequencing and HRM curve analysis identified enoyl-CoA hydratase 2 (ECH2) as the causal gene of A#3-1. The above phenotypes were consistently observed in the ech2-1 allele and supplying sucrose restored the morphological and cellular phenotypes in fugu5-1, ech2-1, A#3-1sm, fugu5-1 ech2-1, and A#3-1; fugu5-1. Taken together, these results suggest that defects in either H(+)-PPase or ECH2 compromise cell proliferation due to defects in mobilizing seed storage lipids. In contrast, ECH2 alone likely promotes CCE during the post-mitotic cell expansion stage of cotyledon development, probably by converting indolebutyric acid to indole acetic acid.
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Affiliation(s)
- Mana Katano
- Department of Biology, Tokyo Gakugei UniversityTokyo, Japan
| | | | - Tomonari Hirano
- Department of Biochemistry and Applied Biosciences, Miyazaki UniversityMiyazaki, Japan
| | | | | | - Hirokazu Tsukaya
- Department of Biological Sciences, Graduate School of Science, University of TokyoTokyo, Japan
- Okazaki Institute for Integrative Bioscience, National Institutes of Natural SciencesOkazaki, Japan
| | - Ali Ferjani
- Department of Biology, Tokyo Gakugei UniversityTokyo, Japan
- *Correspondence: Ali Ferjani,
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Yang Y, Luo Z, Zhang M, Liu C, Gong M, Zou Z. Molecular Cloning, Expression Analysis, and Functional Characterization of the H(+)-Pyrophosphatase from Jatropha curcas. Appl Biochem Biotechnol 2016; 178:1273-85. [PMID: 26643082 DOI: 10.1007/s12010-015-1944-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 11/30/2015] [Indexed: 10/22/2022]
Abstract
H(+)-pyrophosphatase (H(+)-PPase) is a primary pyrophosphate (PPi)-energized proton pump to generate electrochemical H(+) gradient for ATP production and substance translocations across membranes. It plays an important role in stress adaptation that was intensively substantiated by numerous transgenic plants overexpressing H(+)-PPases yet devoid of any correlated studies pointing to the elite energy plant, Jatropha curcas. Herein, we cloned the full length of J. curcas H(+)-PPase (JcVP1) complementary DNA (cDNA) by reverse transcription PCR, based on the assembled sequence of its ESTs highly matched to Hevea brasiliensis H(+)-PPase. This gene encodes a polypeptide of 765 amino acids that was predicted as a K(+)-dependent H(+)-PPase evolutionarily closest to those of other Euphorbiaceae plants. Many cis-regulatory elements relevant to environmental stresses, molecular signals, or tissue-specificity were identified by promoter prediction within the 1.5-kb region upstream of JcVP1 coding sequence. Meanwhile, the responses of JcVP1 expression to several common abiotic stresses (salt, drought, heat, cold) were characterized with a considerable accordance with the inherent stress tolerance of J. curcas. Moreover, we found that the heterologous expression of JcVP1 could significantly improve the salt tolerance in both recombinant Escherichia coli and Saccharomyces cerevisiae, and this effect could be further fortified in yeast by N-terminal addition of a vacuole-targeting signal peptide from the H(+)-PPase of Trypanosoma cruzi.
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Lv S, Jiang P, Nie L, Chen X, Tai F, Wang D, Fan P, Feng J, Bao H, Wang J, Li Y. H(+) -pyrophosphatase from Salicornia europaea confers tolerance to simultaneously occurring salt stress and nitrogen deficiency in Arabidopsis and wheat. Plant Cell Environ 2015; 38:2433-49. [PMID: 25920512 DOI: 10.1111/pce.12557] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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: 12/10/2014] [Accepted: 04/20/2015] [Indexed: 05/14/2023]
Abstract
High salinity and nitrogen (N) deficiency in soil are two key factors limiting crop productivity, and they usually occur simultaneously. Here we firstly found that H(+) -PPase is involved in salt-stimulated NO3 (-) uptake in the euhalophyte Salicornia europaea. Then, two genes (named SeVP1 and SeVP2) encoding H(+) -PPase from S. europaea were characterized. The expression of SeVP1 and SeVP2 was induced by salt stress and N starvation. Both SeVP1 or SeVP2 transgenic Arabidopsis and wheat plants outperformed the wild types (WTs) when high salt and low N occur simultaneously. The transgenic Arabidopsis plants maintained higher K(+) /Na(+) ratio in leaves and exhibited increased NO3 (-) uptake, inorganic pyrophosphate-dependent vacuolar nitrate efflux and assimilation capacity under this double stresses. Furthermore, they had more soluble sugars in shoots and roots and less starch accumulation in shoots than WT. These performances can be explained by the up-regulated expression of ion, nitrate and sugar transporter genes in transgenic plants. Taken together, our results suggest that up-regulation of H(+) -PPase favours the transport of photosynthates to root, which could promote root growth and integrate N and carbon metabolism in plant. This work provides potential strategies for improving crop yields challenged by increasing soil salinization and shrinking farmland.
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Affiliation(s)
- Sulian Lv
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Ping Jiang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Lingling Nie
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Xianyang Chen
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Fang Tai
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Duoliya Wang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Pengxiang Fan
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Juanjuan Feng
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Hexigeduleng Bao
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Jinhui Wang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Yinxin Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
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Wu GQ, Feng RJ, Wang SM, Wang CM, Bao AK, Wei L, Yuan HJ. Co-expression of xerophyte Zygophyllum xanthoxylum ZxNHX and ZxVP1-1 confers enhanced salinity tolerance in chimeric sugar beet (Beta vulgaris L.). Front Plant Sci 2015; 6:581. [PMID: 26284097 PMCID: PMC4517593 DOI: 10.3389/fpls.2015.00581] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 07/13/2015] [Indexed: 05/20/2023]
Abstract
Salinity is one of the major abiotic stresses that limit the growth and productivity of sugar beet (Beta vulgaris L.). To improve sugar beet's salinity tolerance, the ZxNHX and ZxVP1-1 genes encoding tonoplast Na(+)/H(+) antiporter and H(+)-PPase from xerophyte Zygophyllum xanthoxylum were co-expressed by Agrobacterium tumefaciens-mediated transformation. It is showed here that co-expression of ZxNHX and ZxVP1-1 confers enhanced salinity tolerance to the transformed sugar beet plants compared with the wild-type (WT) plants. The chimeric plants grew well in the presence of high salinity (400 mM NaCl), whereas WT plants displayed chlorosis and died within 8 days. Compared to WT plants, the chimeric plants co-expressing ZxNHX and ZxVP1-1 accumulated more proline, Na(+) and K(+) in their leaves and petioles when exposed to high salinity, which caused lower solute potential, retained more water and thus subjected to lesser cell membrane damage. Interestingly, the chimeric plants accumulated higher sucrose, glucose and fructose contents in their storage roots than WT plants in the absence or presence of high salinity. Our results suggested that co-expression of ZxNHX and ZxVP1-1 improved the osmoregulatory capacity in chimeric sugar beet through increased compartmentalization of ions into the vacuoles by enhancing the activity of proton pumps and thus mitigated Na(+)-toxicity for plants.
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Affiliation(s)
- Guo-Qiang Wu
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, China
| | - Rui-Jun Feng
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, China
| | - Suo-Min Wang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
| | - Chun-Mei Wang
- Lanzhou Institute of Husbandry and Pharmaceutical Science, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Ai-Ke Bao
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
| | - Li Wei
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
| | - Hui-Jun Yuan
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, China
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