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Inner Envelope CHLOROPLAST MANGANESE transportER 1 Supports Manganese Homeostasis and Phototrophic Growth in Arabidopsis

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Molecular Plant 2018年第7期11卷 943-954页

作者： Bin Zhang Chi Zhang Congge Liu Yanping Jing Yuan Wang Ling Jin Lei Yang Aigen Fu Jisen Shi Fugeng Zhao Wenzhi Lan Sheng Luan Nanjing University-Nanjing Forestry University Joint Institute for Plant Molecular Biology College of Life Sciences Nanjing University Nanjing 210093 China The Key Laboratory of Western Resources Biology and Biological Technology College of Life Sciences Northwest University Xi'an China Nanjing University-Nanjing Forestry University Joint Institute for Plant Molecular Biology Key Laboratory of Forest Genetics and BiotechnologyNanjing Forestry University Nanjing 210037 China Department of Plant and Microbial Biology University of California Berkeley CA 94720 USA These authors contributed equally to this article.

Manganese （Mn） is an essential catalytic metal in the Mn-cluster that oxidizes water to produce oxygen dur- ing photosynthesis. However, the transport protein（s） responsible for Mn2＋ import into the chloroplast re- mains unknown. Here, we report the characterization ofArabidopsis CMT1 （Chloroplast Manganese Trans- porter 1）, an evolutionarily conserved protein in the Uncharacterized Protein Family 0016 （UPFO016）, that is required for manganese accumulation into the chloroplast. CMT1 is expressed primarily in green tissues, and its encoded product is localized in the inner envelope membrane of the chloroplast. Disruption of CMT1 in the T-DNA insertional mutant cmtl-1 resulted in stunted plant growth, defective thylakoid stacking, and severe reduction of photosystem II complexes and photosynthetic activity. Consistent with reduced oxy- gen evolution capacity, the mutant chloroplasts contained less manganese than the wild-type ones. In sup- port of its function as a Mn transporter, CMT1 protein supported the growth and enabled Mn2＋ accumula- tion in the yeast cells of Mn2＋-uptake deficient mutant （3smfl）. Taken together, our results indicate that CMT1 functions as an inner envelope Mn transporter responsible for chloroplast Mn2＋ uptake.

关键词： chloroplast inner envelope manganese transporter metal transport oxygen-evolving complex

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A Preliminary Study on Silver Isotopic Composition in Polymetallic Ore Deposits in Eastern China

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Journal of Earth Science 2022年第1期33卷 100-108页

作者： Ge Dong Hai-Zhen Wei Yuanfeng Zhu Xi Liu Qi Guo Wei Pu Yibo Lin Junlin Wang State Key Laboratory for Mineral Deposits Research Department of Earth Sciences and EngineeringNanjing University CAS Center for Excellence in Comparative Planetology

A preliminary survey of silver isotopic composition in four polymetallic ores in eastern China shows a larger variation inδ^(109)Ag from-0.014‰to+0.983‰,which is within the total ranges for the entire respective ore deposit types *** diversity of silver isotopic compositions in oredeposits reported here and previous studies seemed to preclude simple isotopic links to particular sources,but reflected the silver isotope fractionation in transport-and deposit-related processes ***δ^(109)Ag values in supergene samples from the Qixiashan Pb-Zn-Ag polymetallic deposit are more positive,in consistent with the statistical δ^(109)Ag distribution from-0.4‰to+2.2‰in 36 pieces of supergene ore samples around the World,which reflects the diverse controls on silver isotope fractionation from the first-order thermodynamic effect,reduction-mediated reaction,remobilization of silver with surficial low-temperature weathering *** hypogene samples in Dazhuangzi orogenic Au-Ag ore deposit,have δ^(109)Ag values close to 0,which implies that equilibrium partitioning associated with metal sources at the high-temperature does not result in a resolvable difference in silver isotopic *** contrast,the hypogene samples which are dominated by pyrite without visible silver minerals (i.e.,skarn iron ore deposit in Edongnan) have shown the largest variation range of δ^(109)Ag,followed by that from the porphyry copper ore in *** could be concluded that the surface adsorption and/or lattice substitution are important factors to control Ag isotope fractionation in oreforming processes,especially for skarn deposits with only *** perspective of silver isotope shows great potentials to understand the processes that lead to the concentrations of metals to economic levels and to constrain the physicochemical conditions during ore-mineralization in metallic ore-deposits.

关键词： silver isotopic composition hypogene ore deposits supergene ore deposits metal transport ore deposits

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Fluid-rock interactions leading to the formation of the epithermal Ag-Pb-Zn veins:A perspective of thermodynamic modeling

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Fundamental Research 2023年第4期3卷 570-578页

作者： Degao Zhai School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

Although vein-type silver-lead-zinc ore deposits have been extensively studied,the factors controlling their formation are still poorly understood and their genesis is a matter of ongoing *** this contribution,I present new mineralogical data and the results of thermodynamic modeling that constrain the conditions of metal transport and deposition for the Aerhada epithermal Pb-Zn-Ag deposit(reserves of>1,000 t Ag@58 g/t and 1.0 Mt Pb+Zn@5.2%)in NE *** primary paragenetic stages have been identified,the second of which(Stage II)is the main base metal and silver ***,argentite,pyrargyrite,and canfieldite are the main Ag-bearing minerals and are spatially associated with an alteration assemblage of quartz-muscovite±chlorite±*** textures and evidence of compositional heterogeneity for freibergite suggest that its decomposition may have redistributed the Ag and contributed in part to the high Ag grade ores in the *** calculations indicate that there was extensive silver ore deposition from a strongly reducing(e.g.,∆log fO_(2)(HM)ofmetal mineral *** path modeling showed that the sole evolution of a magmatic-derived fluid is capable of forming the large Ag-Pb-Zn veins via fluid-rock interactions,which is contrary to the conclusions of some other studies that the mixture of an externally derived fluid is required to explain their *** genetic model for Ag-Pb-Zn ore formation developed in this study is applicable to other polymetallic vein-type deposits in comparable geological settings elsewhere.

关键词： Epithermal deposit Ag-Pb-Zn veins metal transport Thermodynamic modeling NE China

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Isolation and characterization of cobalt-sensitive mutant of Neurospora crassa

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Journal of Coastal Life Medicine 2014年第12期 953-961页

作者： Krishnapuram Rashmi Jeevigunta Naveena Lavanya Latha Pamarthi Maruthi Mohan Department of Biochemistry Osmania UniversityHyderabad-500007India Department of Biotechnology Krishna UniversityMachilipatnam-52001Andhra PradeshIndia

Objective:To isolate and demonstrate the mechanism of metal transport in cobalt-sensitive mutant(CSM)of Neurospora crassa(***).Methods:Isolation of CSM of ***,I_(50)determination,growth measurements,metal ion uptake studies and sexual crosses were performed to determine the mechanism of sensitivity and ***:CSMs of *** were isolated by mutagenesis with diethyl *** than 500 isolates were screened and out of these isolates,CSM-I was 5-fold and CSM-II was 10-fold sensitive to Co on liquid medium as compared to the wild *** analysis of cell wall revealed the decrease in total phosphate *** CSM bound much less cobalt to cell wall fraction than wild *** data indicated closer linkage between resistance and mating type locus(mat),which is,located on LG ***:A CSM of *** is 5-fold more sensitive than wild type and cross sensitive to nickel and copper and hyper-accumulates 2-4 fold more toxic metal ions over wild *** mechanism for sensitivity is decreased in cobalt-binding to cell wall fraction and increased intracellular ***-acon-3 morphologically resembles the CSM,cobalt-sensitive and maps to similar locus.

关键词： metal toxicity Cobalt sensitivity metal transport Cobalt-sensitive mutant Hyper-accumulation Neurospora crassa

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Geochemical Characterization of Base metals in Stream Water and Sediments in the Caddo Lake Watershed, Cass, Harrison and Marion Counties, Texas

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Journal of Geoscience and Environment Protection 2020年第9期8卷 1-23页

作者： Melinda S. Faulkner Melanie L. Ertons Joseph W. Watkins Department of Geology Stephen F. Austin State University Nacogdoches TX USA

The Caddo Lake watershed is located in northeastern Texas and encompasses much of Cass, Harrison, and Marion counties. The watershed is drained by major streams and tributaries flowing in an easterly direction over Eocene-aged rocks and sediments of the Wilcox and Claiborne groups, and empty into the western arm of Caddo Lake. Since 1995, Caddo Lake and some of its tributaries have been included on the State of Texas Clean Water Act 303(d) list by the Texas Commission on Environmental Quality (TCEQ) for impairment due to mercury content in edible tissue, depressed dissolved oxygen, base metal concentrations, and low pH values. The purpose of this multi-year study was to characterize base metal concentrations in stream water and sediments in the Caddo Lake watershed, and document the potential watershed transport and contribution to the impairment of Caddo Lake. Recent water (n = 58) and sediment (n = 116) sampling at 29 sites revealed copper, lead, and zinc concentrations within normal limits and below EPA actionable standards. Mercury concentrations were elevated at 21 of the 29 sampling sites, which could lead to methylation and bioavailability to organisms at all trophic level.

关键词： Caddo Lake Mercury Base metals Geochemistry metal transport

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