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Metal transporter plant

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https://www.readbyqxmd.com/read/29306071/humic-acids-decrease-uptake-and-distribution-of-trace-metals-but-not-the-growth-of-radish-exposed-to-cadmium-toxicity
#1
Gabrijel Ondrasek, Zed Rengel, Davor Romic
Naturally-occurring highly-complexed and polymerised organics such as humic acids (HA), due to their large negative charge, play a crucial role in biogeochemistry of trace metals (TM). Toxic (Cd) as well as essential (Zn, Cu, Mn) TM bind strongly to HA, but how these organo-metalic forms influence metal uptake by plants is poorly understood. A solution culture study was conducted to characterize the effects of different concentrations of HA (0-225mg/L) on the growth and element uptake/distribution in roots, shoots and hypocotyls of radish (Raphanus sativus L...
January 3, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29305728/the-rice-zebra3-z3-mutation-disrupts-citrate-distribution-and-produces-transverse-dark-green-green-variegation-in-mature-leaves
#2
Suk-Hwan Kim, Choon-Tak Kwon, Giha Song, Hee-Jong Koh, Gynheung An, Nam-Chon Paek
BACKGROUND: Rice zebra mutants are leaf variegation mutants that exhibit transverse sectors of green/yellow or green/white in developing or mature leaves. In most cases, leaf variegation is caused by defects in chloroplast biogenesis pathways, leading to an accumulation of reactive oxygen species in a transverse pattern in the leaves. Here, we examine a new type of leaf variegation mutant in rice, zebra3 (z3), which exhibits transverse dark-green/green sectors in mature leaves and lacks the typical yellow or white sectors...
January 5, 2018: Rice
https://www.readbyqxmd.com/read/29305420/in-vitro-reconstitution-functional-dissection-and-mutational-analysis-of-metal-ion-transport-by-mitoferrin-1
#3
Eric T Christenson, Austin S Gallegos, Anirban Banerjee
Iron is universally important to cellular metabolism and mitoferrins-1 and -2 have been proposed to be the iron importers of mitochondria, the cell's assembly plant of heme and iron-sulfur clusters. These iron-containing prosthetic groups are critical for a host of physiological processes ranging from oxygen transport and energy consumption to maintaining protein structural integrity. Mitoferrin-1 (Mfrn1) belongs to the mitochondrial carrier (MC) family and is atypical given its putative metallic cargo; most MCs transport nucleotides, amino acids, or other small to medium-size metabolites...
January 5, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29304466/uptake-transportation-and-accumulation-of-c60-fullerene-and-heavy-metal-ions-cd-cu-and-pb-in-rice-plants-grown-in-an-agricultural-soil
#4
Chuanzhou Liang, Haijun Xiao, Ziqi Hu, Xu Zhang, Jun Hu
The mutual influences of C60 fullerene (C60) and heavy metal ions (Cd, Cu, and Pb) on the uptake, transportation, and accumulation of these coexisting pollutants in four rice cultivars planted in agricultural soil were investigated during the whole life cycle of rice. The biomass of the rice plants was not affected significantly by the presence of C60. C60 exposure exerted different impacts on the bioaccumulation of Cd, Cu, and Pb in various rice tissues. For example, the bioaccumulation of Cd in rice 9311 panicles was significantly decreased (p < ...
January 2, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29281059/identification-of-c-terminal-regions-in-arabidopsis-thaliana-phytochelatin-synthase-1-specifically-involved-in-activation-by-arsenite
#5
Shimpei Uraguchi, Yuka Sone, Yumika Ohta, Naoko Ohkama-Ohtsu, Christian Hofmann, Natalia Hess, Ryosuke Nakamura, Yasukazu Takanezawa, Stephan Clemens, Masako Kiyono
Phytochelatins (PCs) are major chelators of toxic elements including inorganic As in plant cells. Their synthesis confers tolerance and influences within-plant mobility. Previous studies had shown that various metal/metalloid ions differentially activate PC synthesis. Here we identified C-terminal parts involved in arsenite [As(III)] dependent activation of AtPCS1, the primary Arabidopsis PC synthase. The T-DNA insertion in the AtPCS1 mutant cad1-6 causes a truncation in the C-terminal regulatory domain that differentially affects activation by Cd and Zn...
December 20, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29280343/the-ropae-gene-encodes-a-porin-like-protein-involved-in-copper-transit-in-rhizobium-etli-cfn42
#6
Antonio González-Sánchez, Ciro A Cubillas, Fabiola Miranda, Araceli Dávalos, Alejandro García-de Los Santos
Copper (Cu) is an essential micronutrient for all aerobic forms of life. Its oxidation states (Cu+ /Cu2+ ) make this metal an important cofactor of enzymes catalyzing redox reactions in essential biological processes. In gram-negative bacteria, Cu uptake is an unexplored component of a finely regulated trafficking network, mediated by protein-protein interactions that deliver Cu to target proteins and efflux surplus metal to avoid toxicity. Rhizobium etliCFN42 is a facultative symbiotic diazotroph that must ensure its appropriate Cu supply for living either free in the soil or as an intracellular symbiont of leguminous plants...
December 27, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/29250721/annotation-and-characterization-of-cd-responsive-metal-transporter-genes-in-rapeseed-brassica-napus
#7
Xian Duo Zhang, Jin Guo Meng, Kai Xuan Zhao, Xi Chen, Zhi Min Yang
In higher plants, heavy metal transporters are responsible for metal uptake, translocation and homeostasis. These metals include essential metals such as zinc (Zn) or manganese (Mn) and non-essential metals like cadmium (Cd) or lead (Pb). Although a few heavy metal transporters have been well identified in model plants (e.g. Arabidopsis and rice), little is known about their functionality in rapeseed (Brassica napus). B. napus is an important oil crop ranking the third largest sources of vegetable oil over the world...
December 18, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/29247140/genetic-dissection-of-cyclic-pyranopterin-monophosphate-biosynthesis-in-plant-mitochondria
#8
Inga Kruse, Andrew Maclean, Lionel Hill, Janneke Balk
Mitochondria play a key role in the biosynthesis of two metal cofactors, iron-sulfur (FeS) clusters and molybdenum cofactor (Moco). The two pathways intersect at several points, but a scarcity of mutants has hindered studies to better understand these links. We screened a collection of sirtinol-resistant Arabidopsis thaliana mutants for lines with decreased activities of cytosolic FeS enzymes and Moco enzymes. We identified a new mutant allele of ATM3 , encoding the ATP-binding cassette Transporter of the Mitochondria 3 (systematic name ABCB25), confirming the previously reported role of ATM3 in both FeS cluster and Moco biosynthesis...
December 15, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/29220759/polymer-inclusion-membrane-to-access-zn-speciation-comparison-with-root-uptake
#9
Ruben Vera, Clàudia Fontàs, Josep Galceran, Olga Serra, Enriqueta Anticó
Metal speciation studies can be performed with a new technique based on a functionalized membrane. The estimation of not only the total amount of metal, but also the metal available to living organisms is very important. In this context, we have investigated the use of a polymer inclusion membrane (PIM) in a new tool for the determination of free metal ion concentration. In order to check the usefulness of PIM devices in metal speciation studies and metal availability to potato plants (Solanum tuberosum), Zn has been chosen as a case study...
December 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29218630/differential-reactivity-of-closely-related-zinc-ii-binding-metallothioneins-from-the-plant-arabidopsis-thaliana
#10
Hasan T Imam, Claudia A Blindauer
The dynamics of metal binding to and transfer from metalloproteins involved in metal homeostasis are important for understanding cellular distribution of metal ions. The dicotyledonous plant Arabidopsis thaliana has two type 4 seed-specific metallothionein homologues, MT4a and MT4b, with likely roles in zinc(II) homeostasis. These two metallothioneins are 84% identical, with full conservation of all metal-binding cysteine and histidine residues. Yet, differences in their spatial and temporal expression patterns suggested divergence in their biological roles...
December 7, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/29216548/temporal-variability-in-cu-speciation-phytotoxicity-and-soil-microbial-activity-of-cu-polluted-soils-as-affected-by-elevated-temperature
#11
Qing-Long Fu, Nanyan Weng, Manabu Fujii, Dong-Mei Zhou
Global warming has obtained increasing attentions due to its multiple impacts on agro-ecosystem. However, limited efforts had been devoted to reveal the temporal variability of metal speciation and phytotoxicity of heavy metal-polluted soils affected by elevated temperature under the global warming scenario. In this study, effects of elevated temperature (15 °C, 25 °C, and 35 °C) on the physicochemical properties, microbial metabolic activities, and phytotoxicity of three Cu-polluted soils were investigated by a laboratory incubation study...
December 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29214991/pseudomonas-aeruginosa-zinc-uptake-in-chelating-environment-is-primarily-mediated-by-the-metallophore-pseudopaline
#12
Sébastien Lhospice, Nicolas Oswaldo Gomez, Laurent Ouerdane, Catherine Brutesco, Ghassan Ghssein, Christine Hajjar, Ahmed Liratni, Shuanglong Wang, Pierre Richaud, Sophie Bleves, Geneviève Ball, Elise Borezée-Durant, Ryszard Lobinski, David Pignol, Pascal Arnoux, Romé Voulhoux
Metal uptake is vital for all living organisms. In metal scarce conditions a common bacterial strategy consists in the biosynthesis of metallophores, their export in the extracellular medium and the recovery of a metal-metallophore complex through dedicated membrane transporters. Staphylopine is a recently described metallophore distantly related to plant nicotianamine that contributes to the broad-spectrum metal uptake capabilities of Staphylococcus aureus. Here we characterize a four-gene operon (PA4837-PA4834) in Pseudomonas aeruginosa involved in the biosynthesis and trafficking of a staphylopine-like metallophore named pseudopaline...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29205850/ots1-dependent-desumoylation-increases-tolerance-to-high-copper-levels-in-arabidopsis
#13
Erbao Zhan, Huapeng Zhou, Sha Li, Lei Liu, Tinghong Tan, Honghui Lin
The conjugation of SUMO (small ubiquitin-like modifier) to protein substrates is a reversible process (SUMOylation/deSUMOylation) that regulates plant development and stress responses. The essential metal copper (Cu) is required for normal plant growth, but excess amounts are toxic. The SUMO E3 ligase SIZ1 and SIZ1-mediated SUMOylation function in plant tolerance to excess Cu. It is unknown whether deSUMOylation also contributes to Cu tolerance in plants. Here we report that OTS1, a protease that cleaves SUMO from its substrate proteins, participates in Cu tolerance in Arabidopsis thaliana (Arabidopsis)...
December 4, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/29202288/role-of-chelant-on-cu-distribution-and-speciation-in-lolium-multiflorum-by-synchrotron-techniques
#14
Yan-Ping Zhao, Jin-Li Cui, Ting-Shan Chan, Jun-Cai Dong, Dong-Liang Chen, Xiang-Dong Li
Chelants are known to enhance metal translocation in plants; however, the underlying mechanisms are still not fully understood. This study aimed to elucidate the distribution and speciation of Cu in ryegrass (Lolium multiflorum) in both absence and presence of the biodegradable chelant [S,S']-ethylenediamine disuccinic acid (EDDS). The results showed that EDDS increased the Cu translocation factor from root to shoot by 6-9 folds under CuEDDS in comparison with free Cu (50-250μM). Synchrotron-based microscopic X-ray fluorescence (μ-XRF) mapping revealed that EDDS alleviated Cu deposition in the root meristem of root apex and the junction of lateral root zone, and facilitated Cu transport to root stele for subsequent translocation upwards...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29189890/decoding-the-role-of-hypothetical-protein-all3255-of-anabaena-pcc7120-in-heavy-metal-stress-management-in-escherichia-coli
#15
Prashant Kumar Singh, Mengmeng Tang, Sudhir Kumar, Alok Kumar Shrivastava
Cadmium is a non-essential toxic heavy metal for organisms, including plants and cyanobacteria. Cadmium resistance transporters involved in resistance of cells against various toxicants such as drugs and effluxes cytotoxic compounds from cells. However, cadmium resistance-associated protein (CadD) has never been reported from a diazotrophic cyanobacterium Anabaena sp. To test whether the hypothetical protein All3255 of Anabaena sp. PCC7120 a homolog of cadmium resistance-associated protein (CadD) involved in cadmium or heavy metal resistance or not, cloning and heterologous expression analysis of all3255 performed in Escherichia coli BL21 (DE3)...
November 30, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/29180598/intracellular-distribution-of-manganese-by-the-trans-golgi-network-transporter-nramp2-is-critical-for-photosynthesis-and-cellular-redox-homeostasis
#16
Santiago Alejandro, Rémy Cailliatte, Carine Alcon, Léon Dirick, Frédéric Domergue, David Correia, Loren Castaings, Jean-François Briat, Stépahne Mari, Catherine Curie
Plants require trace levels of manganese (Mn) for survival, as it is an essential cofactor in oxygen metabolism, especially O2 production via photosynthesis and the disposal of superoxide radicals. These processes occur in specialized organelles, requiring membrane-bound intracellular transporters to partition Mn between cell compartments. We identified an Arabidopsis thaliana member of the NRAMP family of divalent metal transporters, NRAMP2, which functions in the intracellular distribution of Mn. Two knockdown alleles of NRAMP2 showed decreased activity of photosystem II and increased oxidative stress under Mn-deficient conditions, yet total Mn content remained unchanged...
November 27, 2017: Plant Cell
https://www.readbyqxmd.com/read/29175787/effect-of-medicinal-plants-heavy-metals-and-antibiotics-against-pathogenic-bacteria-isolated-from-raw-boiled-and-pasteurized-milk
#17
Nazish Mazhar Ali, Khadija Sarwar, Syed Abdullah Mazhar, Iram Liaqat, Saiqa Andleeb, Bushra Mazhar, Bushra Kalim
Present study has been undertaken to isolate and identify the bacterial flora in raw, boiled and pasteurized milk. Agar disc diffusion method was used to determine their sensitivity using medicinal plants, antibiotics and heavy metals. Methylene blue reduction test was used to test the quality of milk samples. Total 10 pathogenic strains were isolated, five strains were isolated from raw milk, three from boiled milk and 2 two from pasteurized milk. To determine optimum conditions for growth, these pathogenic microorganisms were incubated at various temperatures and pH...
November 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29172132/melatonin-pretreatment-improves-vanadium-stress-tolerance-of-watermelon-seedlings-by-reducing-vanadium-concentration-in-the-leaves-and-regulating-melatonin-biosynthesis-and-antioxidant-related-gene-expression
#18
Muhammad Azher Nawaz, Yanyan Jiao, Chen Chen, Fareeha Shireen, Zuhua Zheng, Muhammad Imtiaz, Zhilong Bie, Yuan Huang
Vanadium (V) is an important heavy metal with ubiquitous presence in the Earth's crust, but limited information is available as to its effect on plants and management strategies. Melatonin is a widely studied biomolecule; it acts as an antioxidant and a signaling molecule that enhances the abiotic stress tolerance of plants. Melatonin improves copper, zinc, and cadmium tolerance in plants. In this study, we investigated the response of watermelon seedlings to V stress and the potential role of melatonin in enhancing V stress tolerance of watermelon seedlings...
November 20, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29168918/nano-biohybrids-in-vivo-synthesis-of-metal-organic-frameworks-inside-living-plants
#19
Joseph J Richardson, Kang Liang
Plants have a complex passive fluid transport system capable of internalizing small molecules from the environment, and this system offers an ideal route for augmenting plants with functional nanomaterials. Current plant augmentation techniques use pre-formed nanomaterials and permeabilizing agents or plant cuttings. A so far unexplored concept is the formation of the functional material, in situ, from precursors small enough to be passively internalized through the roots without harming the plants. Metal-organic frameworks are ideal for in situ synthesis as they are composed of metal ions coordinated with organic ligands and have recently been mineralized around single-celled organisms in mild aqueous conditions...
November 23, 2017: Small
https://www.readbyqxmd.com/read/29163423/microbial-community-composition-and-functional-capacity-in-a-terrestrial-ferruginous-sulfate-depleted-mud-volcano
#20
Tzu-Hsuan Tu, Li-Wei Wu, Yu-Shih Lin, Hiroyuki Imachi, Li-Hung Lin, Pei-Ling Wang
Terrestrial mud volcanoes (MVs) are an important natural source of methane emission. The role of microbial processes in methane cycling and organic transformation in such environments remains largely unexplored. In this study, we aim to uncover functional potentials and community assemblages across geochemical transitions in a ferruginous, sulfate-depleted MV of eastern Taiwan. Geochemical profiles combined with 16S rRNA gene abundances indicated that anaerobic oxidation of methane (AOM) mediated by ANME-2a group coincided with iron/manganese reduction by Desulfuromonadales at shallow depths deprived of sulfate...
2017: Frontiers in Microbiology
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