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Physiological and Taxonomic Description of the Novel Autotrophic, Metal Oxidizing Bacterium, Pseudogulbenkiania Sp

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Physiological and Taxonomic Description of the Novel Autotrophic, Metal Oxidizing Bacterium, Pseudogulbenkiania Sp University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications in the Biological Sciences Papers in the Biological Sciences 2009 Physiological and taxonomic description of the novel autotrophic, metal oxidizing bacterium, Pseudogulbenkiania sp. strain 2002 Karrie A. Weber University of Nebraska-Lincoln, [email protected] David B. Hedrick University of Tennessee - Knoxville Aaron D. Peacock University of Tennessee - Knoxville J. Cameron Thrash University of California, Berkeley David C. White University of Tennessee - Knoxville, [email protected] See next page for additional authors Follow this and additional works at: https://digitalcommons.unl.edu/bioscifacpub Part of the Life Sciences Commons Weber, Karrie A.; Hedrick, David B.; Peacock, Aaron D.; Thrash, J. Cameron; White, David C.; Achenbach, Laurie A.; and Coates, John D., "Physiological and taxonomic description of the novel autotrophic, metal oxidizing bacterium, Pseudogulbenkiania sp. strain 2002" (2009). Faculty Publications in the Biological Sciences. 201. https://digitalcommons.unl.edu/bioscifacpub/201 This Article is brought to you for free and open access by the Papers in the Biological Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications in the Biological Sciences by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Authors Karrie A. Weber, David B. Hedrick, Aaron D. Peacock, J. Cameron Thrash, David C. White, Laurie A. Achenbach, and John D. Coates This article is available at DigitalCommons@University of Nebraska - Lincoln: https://digitalcommons.unl.edu/ bioscifacpub/201 Appl Microbiol Biotechnol (2009) 83:555–565 DOI 10.1007/s00253-009-1934-7 ENVIRONMENTAL BIOTECHNOLOGY Physiological and taxonomic description of the novel autotrophic, metal oxidizing bacterium, Pseudogulbenkiania sp. strain 2002 Karrie A. Weber & David B. Hedrick & Aaron D. Peacock & J. Cameron Thrash & David C. White & Laurie A. Achenbach & John D. Coates Received: 11 December 2008 /Revised: 9 February 2009 /Accepted: 25 February 2009 /Published online: 31 March 2009 # The Author(s) 2009. This article is published with open access at Springerlink.com Abstract A lithoautotrophic, Fe(II) oxidizing, nitrate- subflava. Similar to P. sublfava, predominant whole cell reducing bacterium, strain 2002 (ATCC BAA-1479; =DSM fatty acids were identified as 16:17c, 42.4%, and 16:0, 18807), was isolated as part of a study on nitrate-dependent Fe 34.1%. Whole cell difference spectra of the Fe(II) reduced (II) oxidation in freshwater lake sediments. Here we provide minus nitrate oxidized cyctochrome content revealed a an in-depth phenotypic and phylogenetic description of the possible role of c-type cytochromes in nitrate-dependent Fe isolate. Strain 2002 is a gram-negative, non-spore forming, (II) oxidation. Strain 2002 was unable to oxidize aqueous or motile, rod-shaped bacterium which tested positive for solid-phase Mn(II) with nitrate as the electron acceptor. In oxidase, catalase, and urease. Analysis of the complete 16S addition to lithotrophic growth with Fe(II), strain 2002 could rRNA gene sequence placed strain 2002 in a clade within the alternatively grow heterotrophically with long-chain fatty family Neisseriaceae in the order Nessieriales of the acids, simple organic acids, carbohydrates, yeast extract, or Betaproteobacteria 99.3% similar to Pseudogulbenkiania casamino acids. Nitrate, nitrite, nitrous oxide, and oxygen also served as terminal electron acceptors with acetate as the electron donor. The GenBank accession number for the 16S rRNA gene sequence of Keyword Fe(II) oxidation . Anaerobic . Nitrate . strain 2002 is AY609199 Bioremediation . Uranium Strain 2002 was deposited in the American Type Culture Collection as well as the Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH under the following accession numbers: ATCC BAA-1479; =DSM 18807. Introduction : : * K. A. Weber J. C. Thrash J. D. Coates ( ) 2+ Department of Plant and Microbial Biology, Microbial oxidation of Fe and solid-phase Fe(II)-bearing University of California, minerals can significantly affect the geochemistry of Berkeley, CA 94720, USA saturated soils and sediments by the formation of reactive e-mail: [email protected] Fe(III) minerals, including mixed Fe(II)–Fe(III) minerals, D. B. Hedrick : A. D. Peacock : D. C. White which may result in the sorption or coprecipitation of Center for Biomarker Analysis, University of Tennessee, metals and/or nutrients (Chaudhuri et al. 2001; Cornell & Knoxville, TN 37932, USA Schwertmann 2003; Lack et al. 2002b; Weber et al. 2001; Weber et al. 2006c). In recent years, the demonstration of L. A. Achenbach Department of Microbiology, Southern Illinois University, anaerobic microbial Fe(II) oxidation, light-dependent or Carbondale, IL 62901, USA nitrate-dependent, has been identified as a mechanism in whichbiologicalre-oxidationofFe(II)inananoxic Present Address: environment can occur (Straub et al. 1996; Weber et al. K. A. Weber Department of Geosciences, University of Nebraska, 2006a; Widdel et al. 1993). To date, several microorgan- Lincoln, NE 68588-0340, USA isms have been identified that are capable of anaerobic Fe 556 Appl Microbiol Biotechnol (2009) 83:555–565 (II) oxidation (Bruce et al. 1999; Chaudhuri et al. 2001; applications (Vasconcelos et al. 2003). Related to metal Edwards et al. 2003; Finneran et al. 2002; Hafenbradl et al. biogeochemistry, the biogenic production of cyanide during 1996; Lack et al. 2002a; Straub et al. 1996; Straub et al. aerobic growth of C. violaceum has been demonstrated to 1999; Widdel et al. 1993), however, few of these grow by mobilize precious metals such as silver, gold, and platinum the metabolism (Weber et al. 2006a). Given that light as a result of the formation of metal–cyanide aqueous penetration of soil and particulate matter is only between complexes (Brandl et al. 2007; Reith et al. 2007). The 8to200μm (Ciania et al. 2005), light independent ability of this microorganism to oxidize aqueous Fe(II) to an reactions such as nitrate-dependent Fe(II) oxidation are insoluble Fe(III) oxide mineral under anaerobic conditions more likely to dominate bio-oxidative processes in saturat- at neutral pH in addition to strain 2002 was recently demon- ed and subsurface soil/sedimentary environments. strated (Weber et al. 2006b). However, similar to many other Nitrate-dependent Fe(II)-oxidizing microorganisms have known Fe(II)-oxidizing organisms, C. violaceum did not been identified in both the Archaea and Bacteria (Weber et grow by this metabolism (Weber et al. 2006b). The al. 2006a). Among the isolates currently described only a coprecipitation of heavy metal and radionuclide contami- hyperthermophilic archaeum (Hafenbradl et al. 1996) and nants with biogenic Fe(III) oxides has been proposed as a the Betaproteobacterium strain 2002 (Weber et al. 2006b) bioremediation strategy (Lack et al. 2002b). Thus, implicat- have been demonstrated to oxidize Fe(II) as the sole ing the role of members within the family Nesseriaceae to electron donor and couple this metabolism to autotrophic participate in metal biogeochemical cycling. Because of its growth. For all other isolates described to date either associated growth, strain 2002 presents a novel opportunity growth was not demonstrated or a co-substrate (acetate or to study nitrate- dependent metal oxidation and the H2) was required under iron oxidizing conditions (Benz et environmental implications of this microbial metabolism in al. 1998; Chaudhuri et al. 2001; Edwards et al. 2003; pure culture. However, it is first necessary to detail the Finneran et al. 2002; Lack et al. 2002a; Sheloblina et al. taxonomic and physiological characteristics of this microor- 2003; Straub & Buchholz-Cleven 1998; Straub et al. 1996; ganism for further study. Here we further describe the Straub et al. 2004). To date, the only other microbial isolate physiology and phylogenetic placement of the novel in pure culture capable of autotrophic growth with Fe(II) as lithoautotrophic, nitrate-dependent Fe(II) oxidizing bacteri- the sole electron donor and nitrate as a terminal electron um, strain 2002, as a member of the recently described acceptor is the hyperthermophilic archaeum, Ferroglobus genus Pseudogulbenkiania in relation to closely related placidus (Hafenbradl et al. 1996). It is worthwhile to note genera in the family Nesseriaceae. that under autotrophic growth conditions Thiobacillus denitrificans has also been demonstrated to oxidize metals coupled to nitrate reduction; however, metal oxidation is Materials and methods dependent on H2 as a co-electron donor (Beller 2005; Beller et al. 2009). It is unclear if Fe(II) could serve as the sole Source and culturing of microorganisms Strain 2002 electron donor for nitrate reduction in this bacterium. (ATCC BAA-1479; =DSM 18807) was previously isolated Strain 2002 was isolated from a nitrate-dependent Fe(II) from a nitrate-dependent Fe(II) oxidizing most probable oxidizing microbial community in freshwater lake sedi- number enumeration series initiated from sediments col- ments (Weber et al. 2006b). The natural abundance of strain lected from a freshwater lake, Southern Illinois University 2002 within the freshwater lake sediment was estimated campus, Carbondale, Illinois (Weber et al. 2006b) and at 2.4×103 cells g-1 wet sediment based on most probable maintained on freshwater basal medium. Freshwater basal number enumeration
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