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Journal articles on the topic 'Metallidurans'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

AVOSCAN, L., H. KHODJA, M. CARRIÈRE, J. COVÈS, and B. GOUGET. "PIXE ANALYSES OF THE SOLUBLE AND MEMBRANE SE-CONTAINING PROTEINS EXTRACTED FROMCUPRIAVIDUS METALLIDURANSCH34 AFTER SELENIUM OXIDES CHALLENGE." International Journal of PIXE 18, no. 03n04 (January 2008): 91–99. http://dx.doi.org/10.1142/s0129083508001430.

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The soil bacterium Cupriavidus metallidurans CH34 resist selenite by reducing it into the insoluble and less toxic elemental selenium. Two mechanisms of reduction of selenium oxides in C. metallidurans CH34 were highlighted: assimilation leading to organic species and detoxification leading to precipitation of selenite in nanoparticules of elemental selenium. The alkyl selenide detected as an intermediate product during assimilation of selenite or as the major accumulated chemical form during assimilation of selenate was identified as selenomethionine.Soluble and membrane proteins were extracted from C. metallidurans CH34 submitted to selenium oxides challenge. After separation by SDS-PAGE, µPIXE analyses were used for Se identification and quantification at a micrometer scale. The profiles of Se distribution in the different samples suggest a non-specific incorporation of selenium probably reflecting the incorporation of selenomethionin in place of the naturally occurring methionin.

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2

Lal, Devi, Namita Nayyar, Puneet Kohli, and Rup Lal. "Cupriavidus metallidurans: A Modern Alchemist." Indian Journal of Microbiology 53, no. 1 (February 6, 2013): 114–15. http://dx.doi.org/10.1007/s12088-013-0355-6.

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3

Munkelt, Doreen, Gregor Grass, and Dietrich H. Nies. "The Chromosomally Encoded Cation Diffusion Facilitator Proteins DmeF and FieF from Wautersia metallidurans CH34 Are Transporters of Broad Metal Specificity." Journal of Bacteriology 186, no. 23 (December 1, 2004): 8036–43. http://dx.doi.org/10.1128/jb.186.23.8036-8043.2004.

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ABSTRACT Genomic sequencing of the β-proteobacterium Wautersia (previously Ralstonia) metallidurans CH34 revealed the presence of three genes encoding proteins of the cation diffusion facilitator (CDF) family. One, CzcD, was previously found to be part of the high-level metal resistance system Czc that mediates the efflux of Co(II), Zn(II), and Cd(II) ions catalyzed by the CzcCBA cation-proton antiporter. The second CDF protein, FieF, is probably mainly a ferrous iron detoxifying protein but also mediated some resistance against other divalent metal cations such as Zn(II), Co(II), Cd(II), and Ni(II) in W. metallidurans or Escherichia coli. The third CDF protein, DmeF, showed the same substrate spectrum as FieF, but with different preferences. DmeF plays the central role in cobalt homeostasis in W. metallidurans, and a disruption of dmeF rendered the high-level metal cation resistance systems Czc and Cnr ineffective against Co(II). This is evidence for the periplasmic detoxification of substrates by RND transporters of the heavy metal efflux family subgroup.

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4

Campbell, Gordon, Lachlan MacLean, Frank Reith, Dale Brewe, Robert Gordon, and Gordon Southam. "Immobilisation of Platinum by Cupriavidus metallidurans." Minerals 8, no. 1 (January 5, 2018): 10. http://dx.doi.org/10.3390/min8010010.

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5

Herzberg, Martin, Dirk Dobritzsch, Stefan Helm, Sacha Baginsky, and Dietrich H. Nies. "The zinc repository of Cupriavidus metallidurans." Metallomics 6, no. 11 (September 24, 2014): 2157–65. http://dx.doi.org/10.1039/c4mt00171k.

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6

D’Inzeo, Tiziana, Rosaria Santangelo, Barbara Fiori, Giulia De Angelis, Viola Conte, Alessia Giaquinto, Ivana Palucci, et al. "Catheter-related bacteremia by Cupriavidus metallidurans." Diagnostic Microbiology and Infectious Disease 81, no. 1 (January 2015): 9–12. http://dx.doi.org/10.1016/j.diagmicrobio.2014.09.015.

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7

Ouyang, Chun-Yu, Yu-Kuan Lin, Dong-Yu Tsai, and Yi-Chun Yeh. "Secretion of metal-binding proteins by a newly discovered OsmY homolog in Cupriavidus metallidurans for the biogenic synthesis of metal nanoparticles." RSC Advances 6, no. 20 (2016): 16798–801. http://dx.doi.org/10.1039/c5ra21533a.

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8

Legatzki, Antje, Gregor Grass, Andreas Anton, Christopher Rensing, and Dietrich H. Nies. "Interplay of the Czc System and Two P-Type ATPases in Conferring Metal Resistance to Ralstonia metallidurans." Journal of Bacteriology 185, no. 15 (August 1, 2003): 4354–61. http://dx.doi.org/10.1128/jb.185.15.4354-4361.2003.

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ABSTRACT Cadmium and zinc are removed from cells of Ralstonia metallidurans by the CzcCBA efflux pump and by two soft-metal-transporting P-type ATPases, CadA and ZntA. The czcCBA genes are located on plasmid pMOL30, and the cadA and zntA genes are on the bacterial chromosome. Expression of zntA from R. metallidurans in Escherichia coli predominantly mediated resistance to zinc, and expression of cadA predominantly mediated resistance to cadmium. Both transporters decreased the cellular content of zinc or cadmium in this host. In the plasmid-free R. metallidurans strain AE104, single gene deletions of cadA or zntA had only a moderate effect on cadmium and zinc resistance, but zinc resistance decreased 6-fold and cadmium resistance decreased 350-fold in double deletion strains. Neither single nor double gene deletions affected zinc resistance in the presence of czcCBA. In contrast, cadmium resistance of the cadA zntA double mutant could be elevated only partially by the presence of CzcCBA. lacZ reporter gene fusions indicated that expression of cadA was induced by cadmium but not by zinc in R. metallidurans strain AE104. In the absence of the zntA gene, expression of cadA occurred at lower cadmium concentrations and zinc now served as an inducer. In contrast, expression of zntA was induced by both zinc and cadmium, and the induction pattern did not change in the presence or absence of CadA. However, expression of both genes, zntA and cadA, was diminished in the presence of CzcCBA. This indicated that CzcCBA efficiently decreased cytoplasmic cadmium and zinc concentrations. It is discussed whether these data favor a model in which the cations are removed either from the cytoplasm or the periplasm by CzcCBA.

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9

Mijnendonckx, Kristel, Md Muntasir Ali, Ann Provoost, Paul Janssen, Max Mergeay, Natalie Leys, Daniël Charlier, Pieter Monsieurs, and Rob Van Houdt. "Spontaneous mutation in the AgrRS two-component regulatory system of Cupriavidus metallidurans results in enhanced silver resistance." Metallomics 11, no. 11 (2019): 1912–24. http://dx.doi.org/10.1039/c9mt00123a.

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10

Roux, Murielle, Géraldine Sarret, Isabelle Pignot-Paintrand, Marc Fontecave, and Jacques Coves. "Mobilization of Selenite by Ralstonia metallidurans CH34." Applied and Environmental Microbiology 67, no. 2 (February 1, 2001): 769–73. http://dx.doi.org/10.1128/aem.67.2.769-773.2001.

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ABSTRACT Ralstonia metallidurans CH34 (formerlyAlcaligenes eutrophus CH34) is a soil bacterium characteristic of metal-contaminated biotopes, as it is able to grow in the presence of a variety of heavy metals. R. metalliduransCH34 is reported now to resist up to 6 mM selenite and to reduce selenite to elemental red selenium as shown by extended X-ray absorption fine-structure analysis. Growth kinetics analysis suggests an adaptation of the cells to the selenite stress during the lag-phase period. Depending on the culture conditions, the medium can be completely depleted of selenite. Selenium accumulates essentially in the cytoplasm as judged from electron microscopy and energy-dispersive X-ray analysis. Elemental selenium, highly insoluble, represents a nontoxic storage form for the bacterium. The ability of R. metallidurans CH34 to reduce large amounts of selenite may be of interest for bioremediation processes targeting selenite-polluted sites.

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11

Fairbrother, L., B. Etschmann, J. Brugger, J. Shapter, G. Southam, and F. Reith. "Biomineralization of Gold in Biofilms ofCupriavidus metallidurans." Environmental Science & Technology 47, no. 6 (March 4, 2013): 2628–35. http://dx.doi.org/10.1021/es302381d.

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12

von Rozycki, Torsten, Dietrich H. Nies, and Milton H. Saier. "Genomic Analyses of Transport Proteins inRalstonia metallidurans." Comparative and Functional Genomics 6, no. 1-2 (2005): 17–56. http://dx.doi.org/10.1002/cfg.454.

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Ralstonia (Wautersia, Cupriavidus) metallidurans(Rme) is better able to withstand high concentrations of heavy metals than any other well-studied organism. This fact renders it a potential agent of bioremediation as well as an ideal model organism for understanding metal resistance phenotypes. We have analysed the genome of Rme for genes encoding homologues of established and putative transport proteins; 13% of all genes in Rme encode such homologues. Nearly one-third of the transporters identified (32%) appear to function in inorganic ion transport with three-quarters of these acting on cations. Transporters specific for amino acids outnumber sugar transporters nearly 3: 1, and this fact plus the large number of uptake systems for organic acids indicates the heterotrophic preferences of these bacteria. Putative drug efflux pumps comprise 10% of the encoded transporters, but numerous efflux pumps for heavy metals, metabolites and macromolecules were also identified. The results presented should facilitate genetic manipulation and mechanistic studies of transport in this remarkable bacterium.

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13

Zhou, Hao, Yuanyuan Qu, Duanxing Li, Xuwang Zhang, Qiao Ma, Wenli Shen, and Jiti Zhou. "Difunctional biogenic Au nanoparticles for colorimetric detection and removal of Hg2+." RSC Advances 5, no. 53 (2015): 42931–34. http://dx.doi.org/10.1039/c5ra03174e.

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Biogenic Au nanoparticles (AuNPs) produced by Cupriavidus metallidurans SHE could act as a colorimetric sensor and scavenger of Hg²⁺ based on biological reduction mediated formation of an amalgam.

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14

Ali, Md Muntasir, Ann Provoost, Laurens Maertens, Natalie Leys, Pieter Monsieurs, Daniel Charlier, and Rob Van Houdt. "Genomic and Transcriptomic Changes that Mediate Increased Platinum Resistance in Cupriavidus metallidurans." Genes 10, no. 1 (January 18, 2019): 63. http://dx.doi.org/10.3390/genes10010063.

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The extensive anthropogenic use of platinum, a rare element found in low natural abundance in the Earth’s continental crust and one of the critical raw materials in the EU innovation partnership framework, has resulted in increased concentrations in surface environments. To minimize its spread and increase its recovery from the environment, biological recovery via different microbial systems is explored. In contrast, studies focusing on the effects of prolonged exposure to Pt are limited. In this study, we used the metal-resistant Cupriavidus metallidurans NA4 strain to explore the adaptation of environmental bacteria to platinum exposure. We used a combined Nanopore–Illumina sequencing approach to fully resolve all six replicons of the C. metallidurans NA4 genome, and compared them with the C. metallidurans CH34 genome, revealing an important role in metal resistance for its chromid rather than its megaplasmids. In addition, we identified the genomic and transcriptomic changes in a laboratory-evolved strain, displaying resistance to 160 µM Pt4+. The latter carried 20 mutations, including a large 69.9 kb deletion in its plasmid pNA4_D (89.6 kb in size), and 226 differentially-expressed genes compared to its parental strain. Many membrane-related processes were affected, including up-regulation of cytochrome c and a lytic transglycosylase, down-regulation of flagellar and pili-related genes, and loss of the pNA4_D conjugative machinery, pointing towards a significant role in the adaptation to platinum.

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15

Große, Cornelia, Anja Poehlein, Kathrin Blank, Claudia Schwarzenberger, Grit Schleuder, Martin Herzberg, and Dietrich H. Nies. "The third pillar of metal homeostasis inCupriavidus metalliduransCH34: preferences are controlled by extracytoplasmic function sigma factors." Metallomics 11, no. 2 (2019): 291–316. http://dx.doi.org/10.1039/c8mt00299a.

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InC. metallidurans, a network of 11 extracytoplasmic function sigma factors forms the third pillar of metal homeostasis acting in addition to the metal transportome and metal repositories as the first and second pillar.

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16

Clavero-León, Claudia, Daniela Ruiz, Javier Cillero, Julieta Orlando, and Bernardo González. "The multi metal-resistant bacterium Cupriavidus metallidurans CH34 affects growth and metal mobilization in Arabidopsis thaliana plants exposed to copper." PeerJ 9 (May 14, 2021): e11373. http://dx.doi.org/10.7717/peerj.11373.

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Copper (Cu) is important for plant growth, but high concentrations can lead to detrimental effects such as primary root length inhibition, vegetative tissue chlorosis, and even plant death. The interaction between plant-soil microbiota and roots can potentially affect metal mobility and availability, and, therefore, overall plant metal concentration. Cupriavidus metallidurans CH34 is a multi metal-resistant bacterial model that alters metal mobility and bioavailability through ion pumping, metal complexation, and reduction processes. The interactions between strain CH34 and plants may affect the growth, metal uptake, and translocation of Arabidopsis thaliana plants that are exposed to or not exposed to Cu. In this study, we looked also at the specific gene expression changes in C. metallidurans when co-cultured with Cu-exposed A. thaliana. We found that A. thaliana’s rosette area, primary and secondary root growth, and dry weight were affected by strain CH34, and that beneficial or detrimental effects depended on Cu concentration. An increase in some plant growth parameters was observed at copper concentrations lower than 50 µM and significant detrimental effects were found at concentrations higher than 50 µM Cu. We also observed up to a 90% increase and 60% decrease in metal accumulation and mobilization in inoculated A. thaliana. In turn, copper-stressed A. thaliana altered C. metallidurans colonization, and cop genes that encoded copper resistance in strain CH34 were induced by the combination of A. thaliana and Cu. These results reveal the complexity of the plant-bacteria-metal triad and will contribute to our understanding of their applications in plant growth promotion, protection, and phytoremediation strategies.

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17

Craig, Jeffrey W., Fang-Yuan Chang, and Sean F. Brady. "Natural Products from Environmental DNA Hosted inRalstonia metallidurans." ACS Chemical Biology 4, no. 1 (January 16, 2009): 23–28. http://dx.doi.org/10.1021/cb8002754.

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18

Avoscan, Laure, Guillaume Untereiner, Jeril Degrouard, Marie Carriere, and Barbara Gouget. "Uranium and selenium resistance in Cupriavidus Metallidurans CH34." Toxicology Letters 172 (October 2007): S157. http://dx.doi.org/10.1016/j.toxlet.2007.05.403.

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19

von Rozycki, Torsten, and Dietrich H. Nies. "Cupriavidus metallidurans: evolution of a metal-resistant bacterium." Antonie van Leeuwenhoek 96, no. 2 (October 1, 2008): 115–39. http://dx.doi.org/10.1007/s10482-008-9284-5.

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20

Avoscan, Laure, Richard Collins, Marie Carriere, Barbara Gouget, and Jacques Covï¿½s. "Seleno-l-Methionine Is the Predominant Organic Form of Selenium in Cupriavidus metallidurans CH34 Exposed to Selenite or Selenate." Applied and Environmental Microbiology 72, no. 9 (September 2006): 6414–16. http://dx.doi.org/10.1128/aem.01084-06.

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ABSTRACT The accumulated organic form of selenium previously detected by X-ray absorption near-edge structure (XANES) analyses in Cupriavidus metallidurans CH34 exposed to selenite or selenate was identified as seleno-l-methionine by coupling high-performance liquid chromatography to inductively coupled plasma-mass spectrometry.

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21

Reith, F., B. Etschmann, C. Grosse, H. Moors, M. A. Benotmane, P. Monsieurs, G. Grass, et al. "Mechanisms of gold biomineralization in the bacterium Cupriavidus metallidurans." Proceedings of the National Academy of Sciences 106, no. 42 (October 7, 2009): 17757–62. http://dx.doi.org/10.1073/pnas.0904583106.

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22

Zhang, Yian-Biao, Sébastien Monchy, Bill Greenberg, Max Mergeay, Oleg Gang, Safiyh Taghavi, and Daniel van der Lelie. "ArsR arsenic-resistance regulatory protein from Cupriavidus metallidurans CH34." Antonie van Leeuwenhoek 96, no. 2 (February 24, 2009): 161–70. http://dx.doi.org/10.1007/s10482-009-9313-z.

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23

Diels, Ludo, Sandra Van Roy, Safyih Taghavi, and Rob Van Houdt. "From industrial sites to environmental applications with Cupriavidus metallidurans." Antonie van Leeuwenhoek 96, no. 2 (July 7, 2009): 247–58. http://dx.doi.org/10.1007/s10482-009-9361-4.

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24

Avoscan, Laure, Marie Carrière, Olivier Proux, Géraldine Sarret, Jéril Degrouard, Jacques Covès, and Barbara Gouget. "Enhanced Selenate Accumulation in Cupriavidus metallidurans CH34 Does Not Trigger a Detoxification Pathway." Applied and Environmental Microbiology 75, no. 7 (February 5, 2009): 2250–52. http://dx.doi.org/10.1128/aem.02452-08.

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ABSTRACT Cupriavidus metallidurans CH34 cells grown under sulfate-limited conditions accumulated up to six times more selenate than cells grown in sulfate-rich medium. The products of selenate reduction detected by X-ray absorption spectroscopy, electron microscopy, and energy-dispersive X-ray analysis did not define this strain as being a good candidate for bioremediation of selenate-contaminated environments.

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25

Hajdu, Rita, and Vera I. Slaveykova. "Cd and Pb removal from contaminated environment by metal resistant bacterium Cupriavidus metallidurans CH34: importance of the complexation and competition effects." Environmental Chemistry 9, no. 4 (2012): 389. http://dx.doi.org/10.1071/en12015.

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Environmental contextLive bacteria are widely used to remove toxic metals from contaminated environments. We use the metal-resistant bacterium Cupriavidus metallidurans, in both model solutions and aqueous extracts of soils, to investigate the complexation and competition effects on Cd and Pb uptake. Accumulation of Cd was more affected by competition with Ca, Mg and Zn, whereas Pb accumulation was more influenced by complexation with humic acids. The study highlights the need to consider chemical site-specificity in the removal of metals from contaminated environments. AbstractThe present study aims to improve the understanding of the role of complexation and competition effects on Cd and Pb accumulation by the metal resistant bacterium Cupriavidus metallidurans largely used in bioremediation. Adsorbed and intracellular metal content in bacteria were determined in model exposure medium within a concentration range spanning from 10–9 to 5 × 10–5 M of Cd or Pb and water extracts from soils. In parallel, the free metal ion concentrations ([M2+]) were measured by an ion exchange technique. Obtained results demonstrated that Cd and Pb accumulation by C. metallidurans was related to [M2+] in the solution. The adsorbed and intracellular M fractions were significantly reduced by nitrilotriacetic acid, Elliot or Pahokee Peat humic acids, as well as by a large excess of Ca, Mg and Zn. No effect on Cd and Pb bioaccumulation was observed in the presence of Mn, Cu or Co at a 10-fold excess for bacteria exposed to 10–6 M of Cd or Pb. Adsorbed and intracellular metal determined when bacteria were exposed to water extracts of soil were in the same order as expected from the model experiments when complexation and competition effects are considered. The study emphasises the necessity of taking into account chemical site-specificity of soil solutions and water, including dissolved organic ligands, pH and the presence of other metals when developing metal removal technologies by living bacteria.

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26

Tricot, Catherine, Sebastien van Aelst, Ruddy Wattiez, Max Mergeay, Victor Stalon, and Johan Wouters. "Overexpression, purification, crystallization and crystallographic analysis of CopK ofCupriavidus metallidurans." Acta Crystallographica Section F Structural Biology and Crystallization Communications 61, no. 9 (August 31, 2005): 825–27. http://dx.doi.org/10.1107/s174430910502316x.

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27

Montero‐Silva, Francisco, Nelson Durán, and Michael Seeger. "Synthesis of extracellular gold nanoparticles using Cupriavidus metallidurans CH34 cells." IET Nanobiotechnology 12, no. 1 (October 31, 2017): 40–46. http://dx.doi.org/10.1049/iet-nbt.2017.0185.

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28

Maillard, Antoine P., Sandra Künnemann, Cornelia Große, Anne Volbeda, Grit Schleuder, Isabelle Petit-Härtlein, Eve de Rosny, Dietrich H. Nies, and Jacques Covès. "Response of CnrX from Cupriavidus metallidurans CH34 to nickel binding." Metallomics 7, no. 4 (2015): 622–31. http://dx.doi.org/10.1039/c4mt00293h.

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29

Langevin, S., J. Vincelette, S. Bekal, and C. Gaudreau. "First Case of Invasive Human Infection Caused by Cupriavidus metallidurans." Journal of Clinical Microbiology 49, no. 2 (November 24, 2010): 744–45. http://dx.doi.org/10.1128/jcm.01947-10.

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30

Juhnke, Susanne, Nicola Peitzsch, Nicole Hübener, Cornelia Große, and Dietrich H. Nies. "New genes involved in chromate resistance inRalstonia metallidurans strain CH34." Archives of Microbiology 179, no. 1 (January 2002): 15–25. http://dx.doi.org/10.1007/s00203-002-0492-5.

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31

Julian, Daniel J., Christopher J. Kershaw, Nigel L. Brown, and Jon L. Hobman. "Transcriptional activation of MerR family promoters in Cupriavidus metallidurans CH34." Antonie van Leeuwenhoek 96, no. 2 (November 13, 2008): 149–59. http://dx.doi.org/10.1007/s10482-008-9293-4.

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32

Zoropogui, Anthony, Serge Gambarelli, and Jacques Covès. "CzcE from Cupriavidus metallidurans CH34 is a copper-binding protein." Biochemical and Biophysical Research Communications 365, no. 4 (January 2008): 735–39. http://dx.doi.org/10.1016/j.bbrc.2007.11.030.

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33

Bravo, Guillermo, Paulina Vega-Celedón, Juan Carlos Gentina, and Michael Seeger. "Effects of Mercury II on Cupriavidus metallidurans Strain MSR33 during Mercury Bioremediation under Aerobic and Anaerobic Conditions." Processes 8, no. 8 (July 25, 2020): 893. http://dx.doi.org/10.3390/pr8080893.

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Mercury is a toxic element that harms organisms and disturbs biogeochemical cycles. Mercury bioremediation is based on the reduction of Hg (II) to Hg (0) by mercury-resistant bacteria. Cupriavidus metallidurans MSR33 possesses a broad-spectrum mercury resistance. This study aims to establish the effects of mercury on growth, oxygen uptake, and mercury removal parameters by C. metallidurans MSR33 in aqueous solution during aerobic and anaerobic mercury bioremediation. A new culture medium (GBC) was designed. The effects of mercury (II) (20 ppm) on growth parameters, oxygen uptake, and mercury removal were evaluated in GBC medium in a bioreactor (3 L) under aerobiosis. The anaerobic kinetics of mercury removal was evaluated by nitrogen replacement during mercury bioremediation in a bioreactor. Strain MSR33 reached a growth rate of µ = 0.43 h−1 in the bioreactor. Mercury inhibited oxygen uptake and bacterial growth; however, this inhibition was reversed after 5 h. Strain MSR33 was able to reduce Hg (II) under aerobic and anaerobic conditions, reaching, at 24 h, a metal removal of 97% and 71%, respectively. Therefore, oxygen was crucial for efficient mercury removal by this bacterium. Strain MSR33 was capable of tolerating the toxic effects of mercury (II) during aerobic bioremediation and recovered its metabolic activity.

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34

Bao, Zhihua, Yoshinori Sato, Reiko Fujimura, and Hiroyuki Ohta. "Alsobacter metallidurans gen. nov., sp. nov., a thallium-tolerant soil bacterium in the order Rhizobiales." International Journal of Systematic and Evolutionary Microbiology 64, Pt_3 (March 1, 2014): 775–80. http://dx.doi.org/10.1099/ijs.0.054783-0.

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A thallium-tolerant, aerobic bacterium, designated strain SK200a-9T, isolated from a garden soil sample was characterized using a polyphasic approach. Comparative analysis of 16S rRNA gene sequences revealed that strain SK200a-9T was affiliated with an uncultivated lineage within the Alphaproteobacteria and the nearest cultivated neighbours were bacteria in genera in the family Methylocystaceae (93.3–94.4 % 16S rRNA gene sequence similarity) and the family Beijerinckiaceae (92.3–93.1 %) in the order Rhizobiales . Cells of strain SK200a-9T were Gram-stain-negative, non-motile, non-spore-forming, poly-β-hydroxybutyrate-accumulating rods. The strain was a chemo-organotrophic bacterium, which was incapable of growth on C1 substrates. Catalase and oxidase were positive. Atmospheric nitrogen fixation and nitrate reduction were negative. The strain contained ubiquinone Q-10 and cellular fatty acids C18 : 1ω7c, C18 : 0, C16 : 1ω7c and C16 : 0 as predominant components. The major polar lipids were diphosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine and phosphatidylglycerol. The DNA G+C content was 64.8 mol%. On the basis of the information described above, strain SK200a-9T is considered to represent a novel species of a new genus in the order Rhizobiales , for which the name Alsobacter metallidurans gen. nov., sp. nov. is proposed. The type strain of Alsobacter metallidurans is SK200a-9T ( = NBRC 107718T = CGMCC 1.12214T).

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35

Maertens, Laurens, Natalie Leys, Jean-Yves Matroule, and Rob Van Houdt. "The Transcriptomic Landscape of Cupriavidus metallidurans CH34 Acutely Exposed to Copper." Genes 11, no. 9 (September 4, 2020): 1049. http://dx.doi.org/10.3390/genes11091049.

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Bacteria are increasingly used for biotechnological applications such as bioremediation, biorecovery, bioproduction, and biosensing. The development of strains suited for such applications requires a thorough understanding of their behavior, with a key role for their transcriptomic landscape. We present a thorough analysis of the transcriptome of Cupriavidus metallidurans CH34 cells acutely exposed to copper by tagRNA-sequencing. C. metallidurans CH34 is a model organism for metal resistance, and its potential as a biosensor and candidate for metal bioremediation has been demonstrated in multiple studies. Several metabolic pathways were impacted by Cu exposure, and a broad spectrum of metal resistance mechanisms, not limited to copper-specific clusters, was overexpressed. In addition, several gene clusters involved in the oxidative stress response and the cysteine-sulfur metabolism were induced. In total, 7500 transcription start sites (TSSs) were annotated and classified with respect to their location relative to coding sequences (CDSs). Predicted TSSs were used to re-annotate 182 CDSs. The TSSs of 2422 CDSs were detected, and consensus promotor logos were derived. Interestingly, many leaderless messenger RNAs (mRNAs) were found. In addition, many mRNAs were transcribed from multiple alternative TSSs. We observed pervasive intragenic TSSs both in sense and antisense to CDSs. Antisense transcripts were enriched near the 5′ end of mRNAs, indicating a functional role in post-transcriptional regulation. In total, 578 TSSs were detected in intergenic regions, of which 35 were identified as putative small regulatory RNAs. Finally, we provide a detailed analysis of the main copper resistance clusters in CH34, which include many intragenic and antisense transcripts. These results clearly highlight the ubiquity of noncoding transcripts in the CH34 transcriptome, many of which are putatively involved in the regulation of metal resistance.

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Kumar, Ranjai, Shadil Ibrahim Wani, Nar Singh Chauhan, Rakesh Sharma, and Dipti Sareen. "Cloning and characterization of an epoxide hydrolase from Cupriavidus metallidurans-CH34." Protein Expression and Purification 79, no. 1 (September 2011): 49–59. http://dx.doi.org/10.1016/j.pep.2011.04.007.

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Nies, Dietrich H. "The biological chemistry of the transition metal “transportome” of Cupriavidus metallidurans." Metallomics 8, no. 5 (2016): 481–507. http://dx.doi.org/10.1039/c5mt00320b.

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Van Houdt, Rob, Pieter Monsieurs, Kristel Mijnendonckx, Ann Provoost, Ann Janssen, Max Mergeay, and Natalie Leys. "Variation in genomic islands contribute to genome plasticity in Cupriavidus metallidurans." BMC Genomics 13, no. 1 (2012): 111. http://dx.doi.org/10.1186/1471-2164-13-111.

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Ryan, Michael P., and Catherine C. Adley. "Specific PCR to identify the heavy-metal-resistant bacterium Cupriavidus metallidurans." Journal of Industrial Microbiology & Biotechnology 38, no. 9 (July 1, 2011): 1613–15. http://dx.doi.org/10.1007/s10295-011-1011-y.

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Juhnke, Susanne, Nicola Peitzsch, Nicole H�bener, Cornelia Gro�e, and Dietrich H. Nies. "New genes involved in chromate resistance in Ralstonia metallidurans strain CH34." Archives of Microbiology 181, no. 5 (May 1, 2004): 390. http://dx.doi.org/10.1007/s00203-004-0665-5.

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Bhatt, Garima, and Timothy P. Denny. "Ralstonia solanacearum Iron Scavenging by the Siderophore Staphyloferrin B Is Controlled by PhcA, the Global Virulence Regulator." Journal of Bacteriology 186, no. 23 (December 1, 2004): 7896–904. http://dx.doi.org/10.1128/jb.186.23.7896-7904.2004.

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ABSTRACT PhcA is a transcriptional regulator that activates expression of multiple virulence genes in the plant pathogen Ralstonia solanacearum. Relative to their wild-type parents, phcA mutants overproduced iron-scavenging activity detected with chrome azurol S siderophore detection medium. Transposon mutagenesis of strain AW1-PC (phcA1) generated strain GB6, which was siderophore negative but retained weak iron-scavenging activity. The ssd gene inactivated in GB6 encodes a protein similar to group IV amino acid decarboxylases, and its transcription was repressed by iron(III) and PhcA. ssd is the terminal gene in a putative operon that also appears to encode three siderophore synthetase subunits, a integral membrane exporter, and three genes with no obvious role in siderophore production. A homologous operon was found in the genomes of Ralstonia metallidurans and Staphylococcus aureus, both of which produce the polycarboxylate siderophore staphyloferrin B. Comparison of the siderophores present in culture supernatants of R. solanacearum, R. metallidurans, and Bacillus megaterium using chemical tests, a siderophore utilization bioassay, thin-layer chromatography, and mass spectroscopy indicated that R. solanacearum produces staphyloferrin B rather than schizokinen as was reported previously. Inactivation of ssd in a wild-type AW1 background resulted in a mutant almost incapable of scavenging iron but normally virulent on tomato plants. AW1 did not produce siderophore activity when cultured in tomato xylem sap, suggesting that the main location in tomato for R. solanacearum during pathogenesis is iron replete.

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MIYAKE-NAKAYAMA, CHIZUKO, SACHIYO MASUJIMA, HISAYOSHI IKATSU, SHIN-ICHI MIYOSHI, and SUMIO SHINODA. "Isolation and Characterization of a New Dichloromethane Degrading Bacterium, Ralstonia metallidurans, PD11." Biocontrol Science 9, no. 4 (2004): 89–93. http://dx.doi.org/10.4265/bio.9.89.

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Millacura, Felipe, Paul Janssen, Pieter Monsieurs, Ann Janssen, Ann Provoost, Rob Van Houdt, and Luis Rojas. "Unintentional Genomic Changes Endow Cupriavidus metallidurans with an Augmented Heavy-Metal Resistance." Genes 9, no. 11 (November 13, 2018): 551. http://dx.doi.org/10.3390/genes9110551.

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For the past three decades, Cupriavidus metallidurans has been one of the major model organisms for bacterial tolerance to heavy metals. Its type strain CH34 contains at least 24 gene clusters distributed over four replicons, allowing for intricate and multilayered metal responses. To gain organic mercury resistance in CH34, broad-spectrum mer genes were introduced in a previous work via conjugation of the IncP-1β plasmid pTP6. However, we recently noted that this CH34-derived strain, MSR33, unexpectedly showed an increased resistance to other metals (i.e., Co2+, Ni2+, and Cd2+). To thoroughly investigate this phenomenon, we resequenced the entire genome of MSR33 and compared its DNA sequence and basal gene expression profile to those of its parental strain CH34. Genome comparison identified 11 insertions or deletions (INDELs) and nine single nucleotide polymorphisms (SNPs), whereas transcriptomic analysis displayed 107 differentially expressed genes. Sequence data implicated the transposition of IS1088 in higher Co2+ and Ni2+ resistances and altered gene expression, although the precise mechanisms of the augmented Cd2+ resistance in MSR33 remains elusive. Our work indicates that conjugation procedures involving large complex genomes and extensive mobilomes may pose a considerable risk toward the introduction of unwanted, undocumented genetic changes. Special efforts are needed for the applied use and further development of small nonconjugative broad-host plasmid vectors, ideally involving CRISPR-related and advanced biosynthetic technologies.

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Mijnendonckx, Kristel, Ann Provoost, Pieter Monsieurs, Natalie Leys, Max Mergeay, Jacques Mahillon, and Rob Van Houdt. "Insertion sequence elements in Cupriavidus metallidurans CH34: Distribution and role in adaptation." Plasmid 65, no. 3 (May 2011): 193–203. http://dx.doi.org/10.1016/j.plasmid.2010.12.006.

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Hajdu, Rita, José Paulo Pinheiro, Josep Galceran, and Vera I. Slaveykova. "Modeling of Cd Uptake and Efflux Kinetics in Metal-Resistant BacteriumCupriavidus metallidurans." Environmental Science & Technology 44, no. 12 (June 15, 2010): 4597–602. http://dx.doi.org/10.1021/es100687h.

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Rosier, Caroline, Natalie Leys, Céline Henoumont, Max Mergeay, and Ruddy Wattiez. "Purification and Characterization of the Acetone Carboxylase of Cupriavidus metallidurans Strain CH34." Applied and Environmental Microbiology 78, no. 12 (April 6, 2012): 4516–18. http://dx.doi.org/10.1128/aem.07974-11.

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ABSTRACTAcetone carboxylase (Acx) is a key enzyme involved in the biodegradation of acetone by bacteria. Except for theHelicobacteraceaefamily, genome analyses revealed that bacteria that possess an Acx, such asCupriavidus metalliduransstrain CH34, are associated with soil. The Acx of CH34 forms the heterohexameric complex α2β2γ2and can carboxylate only acetone and 2-butanone in an ATP-dependent reaction to acetoacetate and 3-keto-2-methylbutyrate, respectively.

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Jian, Xing, Erik C. Wasinger, Jenny V. Lockard, Lin X. Chen, and Chuan He. "Highly Sensitive and Selective Gold(I) Recognition by a Metalloregulator inRalstonia metallidurans." Journal of the American Chemical Society 131, no. 31 (August 12, 2009): 10869–71. http://dx.doi.org/10.1021/ja904279n.

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Bütof, L., N. Wiesemann, M. Herzberg, M. Altzschner, A. Holleitner, F. Reith, and D. H. Nies. "Synergistic gold–copper detoxification at the core of gold biomineralisation inCupriavidus metallidurans." Metallomics 10, no. 2 (2018): 278–86. http://dx.doi.org/10.1039/c7mt00312a.

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Iqbal, Hala A., Jeffrey W. Craig, and Sean F. Brady. "Antibacterial enzymes from the functional screening of metagenomic libraries hosted inRalstonia metallidurans." FEMS Microbiology Letters 354, no. 1 (April 10, 2014): 19–26. http://dx.doi.org/10.1111/1574-6968.12431.

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Zammit, Carla M., Florian Weiland, Joël Brugger, Benjamin Wade, Lyron Juan Winderbaum, Dietrich H. Nies, Gordon Southam, Peter Hoffmann, and Frank Reith. "Proteomic responses to gold(iii)-toxicity in the bacterium Cupriavidus metallidurans CH34." Metallomics 8, no. 11 (2016): 1204–16. http://dx.doi.org/10.1039/c6mt00142d.

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