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Hendricks AR, Cohen RS, McEwen GA, Tien T, Guilliams BF, Alspach A, Snow CD, Ackerson CJ. Laboratory Evolution of Metalloid Reductase Substrate Recognition and Nanoparticle Product Size. ACS Chem Biol 2024; 19:289-299. [PMID: 38295274 DOI: 10.1021/acschembio.3c00493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
Glutathione reductase-like metalloid reductase (GRLMR) is an enzyme that reduces selenodiglutathione (GS-Se-SG), forming zerovalent Se nanoparticles (SeNPs). Error-prone polymerase chain reaction was used to create a library of ∼10,000 GRLMR variants. The library was expressed in BL21Escherichia coli in liquid culture with 50 mM of SeO32- present, under the hypothesis that the enzyme variants with improved GS-Se-SG reduction kinetics would emerge. The selection resulted in a GRLMR variant with two mutations. One of the mutations (D-E) lacks an obvious functional role, whereas the other mutation is L-H within 5 Å of the enzyme active site. This mutation places a second H residue within 5 Å of an active site dicysteine. This GRLMR variant was characterized for NADPH-dependent reduction of GS-Se-SG, GSSG, SeO32-, SeO42-, GS-Te-SG, and TeO32-. The evolved enzyme demonstrated enhanced reduction of SeO32- and gained the ability to reduce SeO42-. This variant is named selenium reductase (SeR) because of its emergent broad activity for a wide variety of Se substrates, whereas the parent enzyme was specific for GS-Se-SG. This study overall suggests that new biosynthetic routes are possible for inorganic nanomaterials using laboratory-directed evolution methods.
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Affiliation(s)
- Alexander R Hendricks
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Rachel S Cohen
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Gavin A McEwen
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Tony Tien
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
- School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Bradley F Guilliams
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Audrey Alspach
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Christopher D Snow
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
- School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Christopher J Ackerson
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
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Sans-Serramitjana E, Gallardo-Benavente C, Melo F, Pérez-Donoso JM, Rumpel C, Barra PJ, Durán P, Mora MDLL. A Comparative Study of the Synthesis and Characterization of Biogenic Selenium Nanoparticles by Two Contrasting Endophytic Selenobacteria. Microorganisms 2023; 11:1600. [PMID: 37375102 DOI: 10.3390/microorganisms11061600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 05/24/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023] Open
Abstract
The present study examined the biosynthesis and characterization of selenium nanoparticles (SeNPs) using two contrasting endophytic selenobacteria, one Gram-positive (Bacillus sp. E5 identified as Bacillus paranthracis) and one Gram-negative (Enterobacter sp. EC5.2 identified as Enterobacter ludwigi), for further use as biofortifying agents and/or for other biotechnological purposes. We demonstrated that, upon regulating culture conditions and selenite exposure time, both strains were suitable "cell factories" for producing SeNPs (B-SeNPs from B. paranthracis and E-SeNPs from E. ludwigii) with different properties. Briefly, dynamic light scattering (DLS), transmission electron microscopy (TEM), and atomic force microscopy (AFM) studies revealed that intracellular E-SeNPs (56.23 ± 4.85 nm) were smaller in diameter than B-SeNPs (83.44 ± 2.90 nm) and that both formulations were located in the surrounding medium or bound to the cell wall. AFM images indicated the absence of relevant variations in bacterial volume and shape and revealed the existence of layers of peptidoglycan surrounding the bacterial cell wall under the conditions of biosynthesis, particularly in the case of B. paranthracis. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) showed that SeNPs were surrounded by the proteins, lipids, and polysaccharides of bacterial cells and that the numbers of the functional groups present in B-SeNPs were higher than in E-SeNPs. Thus, considering that these findings support the suitability of these two endophytic stains as potential biocatalysts to produce high-quality Se-based nanoparticles, our future efforts must be focused on the evaluation of their bioactivity, as well as on the determination of how the different features of each SeNP modulate their biological action and their stability.
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Affiliation(s)
- Eulàlia Sans-Serramitjana
- Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Avenida Francisco Salazar 01145, P.O. Box 54-D, Temuco 4811230, Chile
| | - Carla Gallardo-Benavente
- Centro Biotecnológico de Estudios Microbianos (CEBEM), Universidad de La Frontera, Temuco 4811230, Chile
| | - Francisco Melo
- Departamento de Física, Center for Soft Matter Research, SMAT-C, Usach, Avenida Ecuador, Estación Central, Santiago 9170124, Chile
| | - José M Pérez-Donoso
- BioNanotechnology and Microbiology Lab, Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago 8370133, Chile
| | - Cornelia Rumpel
- Institute of Ecology and Environmental Sciences, UMR 7618, CNRS-UPMC-UPEC-INRAE-IRD, Sorbonne University, 75005 Paris, France
| | - Patricio Javier Barra
- Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Avenida Francisco Salazar 01145, P.O. Box 54-D, Temuco 4811230, Chile
- Biocontrol Research Laboratory, Universidad de La Frontera, Temuco 4811230, Chile
| | - Paola Durán
- Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Avenida Francisco Salazar 01145, P.O. Box 54-D, Temuco 4811230, Chile
- Biocontrol Research Laboratory, Universidad de La Frontera, Temuco 4811230, Chile
| | - María de La Luz Mora
- Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Avenida Francisco Salazar 01145, P.O. Box 54-D, Temuco 4811230, Chile
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Qu L, Xu J, Dai Z, Elyamine AM, Huang W, Han D, Dang B, Xu Z, Jia W. Selenium in soil-plant system: Transport, detoxification and bioremediation. JOURNAL OF HAZARDOUS MATERIALS 2023; 452:131272. [PMID: 37003006 DOI: 10.1016/j.jhazmat.2023.131272] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 03/09/2023] [Accepted: 03/21/2023] [Indexed: 05/03/2023]
Abstract
Selenium (Se) is an essential micronutrient for humans and a beneficial element for plants. However, high Se doses always exhibit hazardous effects. Recently, Se toxicity in plant-soil system has received increasing attention. This review will summarize (1) Se concentration in soils and its sources, (2) Se bioavailability in soils and influencing factors, (3) mechanisms on Se uptake and translocation in plants, (4) toxicity and detoxification of Se in plants and (5) strategies to remediate Se pollution. High Se concentration mainly results from wastewater discharge and industrial waste dumping. Selenate (Se [VI]) and selenite (Se [IV]) are the two primary forms absorbed by plants. Soil conditions such as pH, redox potential, organic matter and microorganisms will influence Se bioavailability. In plants, excessive Se will interfere with element uptake, depress photosynthetic pigment biosynthesis, generate oxidative damages and cause genotoxicity. Plants employ a series of strategies to detoxify Se, such as activating antioxidant defense systems and sequestrating excessive Se in the vacuole. In order to alleviate Se toxicity to plants, some strategies can be applied, including phytoremediation, OM remediation, microbial remediation, adsorption technique, chemical reduction technology and exogenous substances (such as Methyl jasmonate, Nitric oxide and Melatonin). This review is expected to expand the knowledge of Se toxicity/detoxicity in soil-plant system and offer valuable insights into soils Se pollution remediation strategies.
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Affiliation(s)
- Lili Qu
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, Henan, China; National Tobacco Cultivation and Physiology and Biochemistry Research Center, Zhengzhou, Henan, China; Key Laboratory for Tobacco Cultivation of Tobacco Industry, Zhengzhou, Henan, China
| | - Jiayang Xu
- College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, China
| | - Zhihua Dai
- Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang, China
| | - Ali Mohamed Elyamine
- Key Laboratory of Resources and Environmental Microbiology, Department of Biology, Shantou University, Shantou, Guangdong, China
| | - Wuxing Huang
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, Henan, China; National Tobacco Cultivation and Physiology and Biochemistry Research Center, Zhengzhou, Henan, China; Key Laboratory for Tobacco Cultivation of Tobacco Industry, Zhengzhou, Henan, China
| | - Dan Han
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, Henan, China; National Tobacco Cultivation and Physiology and Biochemistry Research Center, Zhengzhou, Henan, China; Key Laboratory for Tobacco Cultivation of Tobacco Industry, Zhengzhou, Henan, China
| | - Bingjun Dang
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, Henan, China; National Tobacco Cultivation and Physiology and Biochemistry Research Center, Zhengzhou, Henan, China; Key Laboratory for Tobacco Cultivation of Tobacco Industry, Zhengzhou, Henan, China
| | - Zicheng Xu
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, Henan, China; National Tobacco Cultivation and Physiology and Biochemistry Research Center, Zhengzhou, Henan, China; Key Laboratory for Tobacco Cultivation of Tobacco Industry, Zhengzhou, Henan, China
| | - Wei Jia
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, Henan, China; National Tobacco Cultivation and Physiology and Biochemistry Research Center, Zhengzhou, Henan, China; Key Laboratory for Tobacco Cultivation of Tobacco Industry, Zhengzhou, Henan, China
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Staicu LC, Wójtowicz PJ, Molnár Z, Ruiz-Agudo E, Gallego JLR, Baragaño D, Pósfai M. Interplay between arsenic and selenium biomineralization in Shewanella sp. O23S. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 306:119451. [PMID: 35569621 DOI: 10.1016/j.envpol.2022.119451] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 05/04/2022] [Accepted: 05/07/2022] [Indexed: 06/15/2023]
Abstract
Bacteria play crucial roles in the biogeochemical cycle of arsenic (As) and selenium (Se) as these elements are metabolized via detoxification, energy generation (anaerobic respiration) and biosynthesis (e.g. selenocysteine) strategies. To date, arsenic and selenium biomineralization in bacteria were studied separately. In this study, the anaerobic metabolism of As and Se in Shewanella sp. O23S was investigated separately and mixed, with an emphasis put on the biomineralization products of this process. Multiple analytical techniques including ICP-MS, TEM-EDS, XRD, Micro-Raman, spectrophotometry and surface charge (zeta potential) were employed. Shewanella sp. O23S is capable of reducing selenate (SeO42-) and selenite (SeO32-) to red Se(-S)0, and arsenate (AsO43-) to arsenite (AsO33-). The release of H2S from cysteine led to the precipitation of AsS minerals: nanorod AsS and granular As2S3. When As and Se oxyanions were mixed, both As-S and Se(-S)0 biominerals were synthesized. All biominerals were extracellular, amorphous and presented a negative surface charge (-24 to -38 mV). Kinetic analysis indicated the following reduction yields: SeO32- (90%), AsO43- (60%), and SeO42- (<10%). The mix of SeO32- with AsO43- led to a decrease in As removal to 30%, while Se reduction yield was unaffected (88%). Interestingly, SeO42- incubated with AsO43- boosted the Se removal (71%). The exclusive extracellular formation of As and Se biominerals might indicate an extracellular respiratory process characteristic of various Shewanella species and strains. This is the first study documenting a complex interplay between As and Se oxyanions: selenite decreased arsenate reduction, whereas arsenate stimulated selenate reduction. Further investigation needs to clarify whether Shewanella sp. O23S employs multi-substrate respiratory enzymes or separate, high affinity enzymes for As and Se oxyanion respiration.
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Affiliation(s)
- Lucian C Staicu
- Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096, Warsaw, Poland.
| | - Paulina J Wójtowicz
- Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096, Warsaw, Poland
| | - Zsombor Molnár
- Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary; ELKH-PE Environmental Mineralogy Research Group, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary
| | | | - José Luis R Gallego
- Environmental Biogeochemistry & Raw Materials Group and INDUROT, Campus de Mieres, University of Oviedo, C/Gonzalo Gutiérrez Quirós. S/N, 33600, Mieres, Spain
| | - Diego Baragaño
- Environmental Biogeochemistry & Raw Materials Group and INDUROT, Campus de Mieres, University of Oviedo, C/Gonzalo Gutiérrez Quirós. S/N, 33600, Mieres, Spain
| | - Mihály Pósfai
- Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary; ELKH-PE Environmental Mineralogy Research Group, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary
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Wang Z, Huang W, Pang F. Selenium in Soil-Plant-Microbe: A Review. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022; 108:167-181. [PMID: 34617141 DOI: 10.1007/s00128-021-03386-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Selenium (Se) plays an important role in geochemistry and is an essential trace element for humans and animals. This review summarizes the transformation and accumulation of Se in the plant-soil-microbe system. As one of the important reservoirs of Se, soil is an important material basis of its entry into the food chain through plants. Soil with an appropriate amount of Se is beneficial for plant growth and plays a valuable role in a stress-resistant environment. Among the many migration and transformation pathways, the transformation of Se by microorganisms is particularly important and is the main form of Se transformation in the soil environment. In this review, the role and form transformation of Se in plants, soil, and microorganisms; the role of Se in plants; the form, input, and output of Se in soil; the absorption and transformation of Se by plants; and the role of microorganisms in Se transformation are presented. In addition to describing the migration and transformation laws of Se in the environment, this review expounds on the main directions and trends of Se research in the agricultural field as well as current gaps and difficulties in Se-related research. Overall, this reviews aims to provide necessary information and theoretical references for the development of Se-rich agriculture.
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Affiliation(s)
- Zhen Wang
- College of Biology and Pharmacy, Yulin Normal University, Yulin, 537000, China
| | - Wei Huang
- College of Biology and Pharmacy, Yulin Normal University, Yulin, 537000, China.
| | - Fei Pang
- College of Biology and Pharmacy, Yulin Normal University, Yulin, 537000, China.
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López MC, Galán B, Carmona M, Navarro Llorens JM, Peretó J, Porcar M, Getino L, Olivera ER, Luengo JM, Castro L, García JL. Xerotolerance: A New Property in Exiguobacterium Genus. Microorganisms 2021; 9:2455. [PMID: 34946057 PMCID: PMC8706201 DOI: 10.3390/microorganisms9122455] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/24/2021] [Accepted: 11/25/2021] [Indexed: 11/16/2022] Open
Abstract
The highly xerotolerant bacterium classified as Exiguobacterium sp. Helios isolated from a solar panel in Spain showed a close relationship to Exiguobacterium sibiricum 255-15 isolated from Siberian permafrost. Xerotolerance has not been previously described as a characteristic of the extremely diverse Exiguobacterium genus, but both strains Helios and 255-15 showed higher xerotolerance than that described in the reference xerotolerant model strain Deinococcus radiodurans. Significant changes observed in the cell morphology after their desiccation suggests that the structure of cellular surface plays an important role in xerotolerance. Apart from its remarkable resistance to desiccation, Exiguobacterium sp. Helios strain shows several polyextremophilic characteristics that make it a promising chassis for biotechnological applications. Exiguobacterium sp. Helios cells produce nanoparticles of selenium in the presence of selenite linked to its resistance mechanism. Using the Lactobacillus plasmid pRCR12 that harbors a cherry marker, we have developed a transformation protocol for Exiguobacterium sp. Helios strain, being the first time that a bacterium of Exiguobacterium genus has been genetically modified. The comparison of Exiguobacterium sp. Helios and E. sibiricum 255-15 genomes revealed several interesting similarities and differences. Both strains contain a complete set of competence-related DNA transformation genes, suggesting that they might have natural competence, and an incomplete set of genes involved in sporulation; moreover, these strains not produce spores, suggesting that these genes might be involved in xerotolerance.
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Affiliation(s)
- María Castillo López
- Microbial and Plant Biotechnology Department, Centro de Investigaciones Biológicas Margarita Salas-CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain; (M.C.L.); (B.G.); (M.C.)
- Department of Biochemistry and Molecular Biology, Facultad de Ciencias Biológicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040 Madrid, Spain;
| | - Beatriz Galán
- Microbial and Plant Biotechnology Department, Centro de Investigaciones Biológicas Margarita Salas-CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain; (M.C.L.); (B.G.); (M.C.)
| | - Manuel Carmona
- Microbial and Plant Biotechnology Department, Centro de Investigaciones Biológicas Margarita Salas-CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain; (M.C.L.); (B.G.); (M.C.)
| | - Juana María Navarro Llorens
- Department of Biochemistry and Molecular Biology, Facultad de Ciencias Biológicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040 Madrid, Spain;
| | - Juli Peretó
- Program for Applied Systems Biology and Synthetic Biology, Instituto de Biología Integrativa de Sistemas (I2SYSBIO) (UV-CSIC), Carrer del Catedràtic Agustín Escardino Benlloch s/n, 46980 Paterna, Spain; (J.P.); (M.P.)
- Department of Biochemistry and Molecular Biology, University of Valencia, 46100 Burjassot, Spain
| | - Manuel Porcar
- Program for Applied Systems Biology and Synthetic Biology, Instituto de Biología Integrativa de Sistemas (I2SYSBIO) (UV-CSIC), Carrer del Catedràtic Agustín Escardino Benlloch s/n, 46980 Paterna, Spain; (J.P.); (M.P.)
| | - Luis Getino
- Department of Molecular Biology, Facultades de Veterinaria y Biología, Universidad de León, 24007 León, Spain; (L.G.); (E.R.O.); (J.M.L.)
| | - Elías R. Olivera
- Department of Molecular Biology, Facultades de Veterinaria y Biología, Universidad de León, 24007 León, Spain; (L.G.); (E.R.O.); (J.M.L.)
| | - José M. Luengo
- Department of Molecular Biology, Facultades de Veterinaria y Biología, Universidad de León, 24007 León, Spain; (L.G.); (E.R.O.); (J.M.L.)
| | - Laura Castro
- Department of Applied Mathematics, Materials Science and Engineering and Electronic Technology, School of Experimental Sciences and Technology, Rey Juan Carlos University, 28933 Móstoles, Spain;
| | - José Luís García
- Microbial and Plant Biotechnology Department, Centro de Investigaciones Biológicas Margarita Salas-CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain; (M.C.L.); (B.G.); (M.C.)
- Program for Applied Systems Biology and Synthetic Biology, Instituto de Biología Integrativa de Sistemas (I2SYSBIO) (UV-CSIC), Carrer del Catedràtic Agustín Escardino Benlloch s/n, 46980 Paterna, Spain; (J.P.); (M.P.)
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Borah SN, Goswami L, Sen S, Sachan D, Sarma H, Montes M, Peralta-Videa JR, Pakshirajan K, Narayan M. Selenite bioreduction and biosynthesis of selenium nanoparticles by Bacillus paramycoides SP3 isolated from coal mine overburden leachate. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 285:117519. [PMID: 34380220 DOI: 10.1016/j.envpol.2021.117519] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 04/18/2021] [Accepted: 05/17/2021] [Indexed: 05/15/2023]
Abstract
A native strain of Bacillus paramycoides isolated from the leachate of coal mine overburden rocks was investigated for its potential to produce selenium nanoparticles (SeNPs) by biogenic reduction of selenite, one of the most toxic forms of selenium. 16S rDNA sequencing was used to identify the bacterial strain (SP3). The SeNPs were characterized using spectroscopic (UV-Vis absorbance, dynamic light scattering, X-ray diffraction, and Raman), surface charge measurement (zeta potential), and ultramicroscopic (FESEM, EDX, FETEM) analyses. SP3 exhibited extremely high selenite tolerance (1000 mM) and reduced 10 mM selenite under 72 h to produce spherical monodisperse SeNPs with an average size of 149.1 ± 29 nm. FTIR analyses indicated exopolysaccharides coating the surface of SeNPs, which imparted a charge of -29.9 mV (zeta potential). The XRD and Raman spectra revealed the SeNPs to be amorphous. Furthermore, biochemical assays and microscopic studies suggest that selenite was reduced by membrane reductases. This study reports, for the first time, the reduction of selenite and biosynthesis of SeNPs by B. paramycoides, a recently discovered bacterium. The results suggest that B. paramycoides SP3 could be exploited for eco-friendly removal of selenite from contaminated sites with the concomitant biosynthesis of SeNPs.
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Affiliation(s)
- Siddhartha Narayan Borah
- Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
| | - Lalit Goswami
- Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Suparna Sen
- Environmental Biotechnology Laboratory, Life Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, 781035, Assam, India
| | - Deepa Sachan
- Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Hemen Sarma
- Department of Botany, N. N. Saikia College, Titabor, 785630, Assam, India
| | - Milka Montes
- Department of Chemistry, The University of Texas of the Permian Basin, Odessa, TX, 79762, USA
| | - Jose R Peralta-Videa
- Department of Chemistry and Biochemistry, University of Texas at El Paso, 500 W. University Ave., El Paso, TX, 79968, USA
| | - Kannan Pakshirajan
- Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India; Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Mahesh Narayan
- Department of Chemistry and Biochemistry, University of Texas at El Paso, 500 W. University Ave., El Paso, TX, 79968, USA
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Ali I, Shrivastava V. Recent advances in technologies for removal and recovery of selenium from (waste)water: A systematic review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 294:112926. [PMID: 34118514 DOI: 10.1016/j.jenvman.2021.112926] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 05/06/2021] [Accepted: 05/08/2021] [Indexed: 06/12/2023]
Abstract
Selenium (Se) is distributed into different environmental compartments by natural and anthropogenic activities, and generally discharged in the form of selenate [SeO42-] and selenite [SeO32-], which are both toxic. Physical-chemical and biological treatment processes have been reported to exhibit good treatment efficiencies for Se from aqueous streams, only a few demonstrated to achieve effluent concentrations <5 μg/L. Moreover, there are only a few numbers of studies that describe the progress in technological developments over the last decade. Therefore, to unify the state of knowledge, identify ongoing research trends, and determine the challenges associated with available technologies, this systematic review critically analyses the published research on Se treatment. Specific topics covered in this review include (1) Se chemistry, toxicity, sources and legislation, (2) types of Se treatment technologies, (3) development in Se treatment approaches, (4) Se recovery and circular economy and (5) future prospects. The current research has been found to majorly focused on Se removal via adsorption techniques. However, the key challenges facing Se treatment technologies are related to the presence of competing ions in the solution and the persistence of selenate compared to selenite during their reduction.
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Affiliation(s)
- Izba Ali
- InOpSys - Mobiele Waterzuivering voor Chemie en Farma, Zandvoortstraat 12a, 2800, Mechelen, Belgium.
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Use of a Specific Phage Cocktail for Soft Rot Control on Ware Potatoes: A Case Study. Viruses 2021; 13:v13061095. [PMID: 34201375 PMCID: PMC8229397 DOI: 10.3390/v13061095] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 05/31/2021] [Accepted: 06/04/2021] [Indexed: 01/15/2023] Open
Abstract
Using bacteriophages (bacterial viruses) to control pathogenic bacteria is a promising approach in horticulture. However, the application of this strategy in real conditions requires compliance with particular technological and environmental restraints. The presented paper concerns the process of phage selection to create a cocktail that is efficient against the circulating causal agents of potato soft rot. The resulting phage cocktail causes a complete lysis of a mixture of circulating pectobacterial strains in vitro. In the context of being used to treat ware potatoes during off-season storage, the protocol of phage application via the humidity maintenance system was designed. The phage cocktail was shown to reduce the population of Pectobacterium spp. 10–12-fold, achieving a population that was below a symptomatic threshold.
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Staicu LC, Barton LL. Selenium respiration in anaerobic bacteria: Does energy generation pay off? J Inorg Biochem 2021; 222:111509. [PMID: 34118782 DOI: 10.1016/j.jinorgbio.2021.111509] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/18/2021] [Accepted: 05/30/2021] [Indexed: 01/03/2023]
Abstract
Selenium (Se) respiration in bacteria was revealed for the first time at the end of 1980s. Although thermodynamically-favorable, energy-dense and documented in phylogenetically-diverse bacteria, this metabolic process appears to be accompanied by a number of challenges and numerous unanswered questions. Selenium oxyanions, SeO42- and SeO32-, are reduced to elemental Se (Se0) through anaerobic respiration, the end product being solid and displaying a considerable size (up to 500 nm) at the bacterial scale. Compared to other electron acceptors used in anaerobic respiration (e.g. N, S, Fe, Mn, and As), Se is one of the few elements whose end product is solid. Furthermore, unlike other known bacterial intracellular accumulations such as volutin (inorganic polyphosphate), S0, glycogen or magnetite, Se0 has not been shown to play a nutritional or ecological role for its host. In the context of anaerobic respiration of Se oxyanions, biogenic Se0 appears to be a by-product, a waste that needs proper handling, and this raises the question of the evolutionary implications of this process. Why would bacteria use a respiratory substrate that is useful, in the first place, and then highly detrimental? Interestingly, in certain artificial ecosystems (e.g. upflow bioreactors) Se0 might help bacterial cells to increase their density and buoyancy and thus avoid biomass wash-out, ensuring survival. This review article provides an in-depth analysis of selenium respiration (model selenium respiring bacteria, thermodynamics, respiratory enzymes, and genetic determinants), complemented by an extensive discussion about the evolutionary implications and the properties of biogenic Se0 using published and original/unpublished results.
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Affiliation(s)
- Lucian C Staicu
- Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Larry L Barton
- Department of Biology, University of New Mexico, MSCO3 2020, Albuquerque, NM 87131, USA
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11
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Huang S, Wang Y, Tang C, Jia H, Wu L. Speeding up selenite bioremediation using the highly selenite-tolerant strain Providencia rettgeri HF16-A novel mechanism of selenite reduction based on proteomic analysis. JOURNAL OF HAZARDOUS MATERIALS 2021; 406:124690. [PMID: 33296764 DOI: 10.1016/j.jhazmat.2020.124690] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/24/2020] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
Selenite in the environment is extremely biotoxic, thus, the biotransformation of selenite into selenium nanoparticles (SeNPs) by microorganisms is gaining increasing interest. However, the relatively low selenite tolerance and slow processing by known microorganisms limit its application. In this study, a highly selenite-resistant strain (up to 800 mM) was isolated from coalmine soil and identified as Providencia rettgeri HF16. Remarkably, 5 mM selenite was entirely transformed by this strain within 24 h, and SeNPs were detected as early as 2 h of incubation, which is a more rapid conversion than that described for other microorganisms. The SeNPs were spherical in shape with diameters ranging from 120 nm to 295 nm, depending on the incubation time. Moreover, in vitro selenite-reduction activity was detected in the cytoplasmic protein fraction with NADPH or NADH serving as electron donors. Proteomics analysis and key enzyme activity tests revealed the presence of a sulfite reductase-mediated selenite reduction pathway. To our knowledge, this is the first report to identify the involvement of sulfite reductase in selenite reduction under physiological conditions. P. rettgeri HF16 could be a suitable and robust biocatalyst for the bioremediation of selenite, and would accelerate the efficient and economical synthesis of selenium nanoparticles.
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Affiliation(s)
- ShengWei Huang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230026, Anhui, China
| | - Yuting Wang
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230001, Anhui, China; Intelligent Pathology Institute, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230036, Anhui, China
| | - Caiguo Tang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230026, Anhui, China
| | - HuiLing Jia
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; School of Life Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Lifang Wu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230026, Anhui, China; School of Life Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China.
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12
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Chiniquy D, Barnes EM, Zhou J, Hartman K, Li X, Sheflin A, Pella A, Marsh E, Prenni J, Deutschbauer AM, Schachtman DP, Tringe SG. Microbial Community Field Surveys Reveal Abundant Pseudomonas Population in Sorghum Rhizosphere Composed of Many Closely Related Phylotypes. Front Microbiol 2021; 12:598180. [PMID: 33767674 PMCID: PMC7985074 DOI: 10.3389/fmicb.2021.598180] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 02/04/2021] [Indexed: 11/13/2022] Open
Abstract
While the root-associated microbiome is typically less diverse than the surrounding soil due to both plant selection and microbial competition for plant derived resources, it typically retains considerable complexity, harboring many hundreds of distinct bacterial species. Here, we report a time-dependent deviation from this trend in the rhizospheres of field grown sorghum. In this study, 16S rRNA amplicon sequencing was used to determine the impact of nitrogen fertilization on the development of the root-associated microbiomes of 10 sorghum genotypes grown in eastern Nebraska. We observed that early rhizosphere samples exhibit a significant reduction in overall diversity due to a high abundance of the bacterial genus Pseudomonas that occurred independent of host genotype in both high and low nitrogen fields and was not observed in the surrounding soil or associated root endosphere samples. When clustered at 97% identity, nearly all the Pseudomonas reads in this dataset were assigned to a single operational taxonomic unit (OTU); however, exact sequence variant (ESV)-level resolution demonstrated that this population comprised a large number of distinct Pseudomonas lineages. Furthermore, single-molecule long-read sequencing enabled high-resolution taxonomic profiling revealing further heterogeneity in the Pseudomonas lineages that was further confirmed using shotgun metagenomic sequencing. Finally, field soil enriched with specific carbon compounds recapitulated the increase in Pseudomonas, suggesting a possible connection between the enrichment of these Pseudomonas species and a plant-driven exudate profile.
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Affiliation(s)
- Dawn Chiniquy
- Department of Energy, Joint Genome Institute, Berkeley, CA, United States.,Lawrence Berkeley National Laboratory, Environmental Genomics and Systems Biology Division, Department of Energy, Berkeley, CA, United States
| | - Elle M Barnes
- Department of Energy, Joint Genome Institute, Berkeley, CA, United States
| | - Jinglie Zhou
- Department of Energy, Joint Genome Institute, Berkeley, CA, United States
| | - Kyle Hartman
- Department of Energy, Joint Genome Institute, Berkeley, CA, United States
| | - Xiaohui Li
- Department of Energy, Joint Genome Institute, Berkeley, CA, United States.,Lawrence Berkeley National Laboratory, Environmental Genomics and Systems Biology Division, Department of Energy, Berkeley, CA, United States.,Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO, United States.,Department of Agronomy and Horticulture and Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Amy Sheflin
- Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO, United States
| | - Allyn Pella
- Department of Agronomy and Horticulture and Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Ellen Marsh
- Department of Agronomy and Horticulture and Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Jessica Prenni
- Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO, United States
| | - Adam M Deutschbauer
- Department of Agronomy and Horticulture and Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Daniel P Schachtman
- Department of Agronomy and Horticulture and Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Susannah G Tringe
- Department of Energy, Joint Genome Institute, Berkeley, CA, United States.,Lawrence Berkeley National Laboratory, Environmental Genomics and Systems Biology Division, Department of Energy, Berkeley, CA, United States
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13
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Sabuda MC, Rosenfeld CE, DeJournett TD, Schroeder K, Wuolo-Journey K, Santelli CM. Fungal Bioremediation of Selenium-Contaminated Industrial and Municipal Wastewaters. Front Microbiol 2020; 11:2105. [PMID: 33013769 PMCID: PMC7507899 DOI: 10.3389/fmicb.2020.02105] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 08/10/2020] [Indexed: 12/15/2022] Open
Abstract
Selenium (Se) is an essential element for most organisms yet can cause severe negative biological consequences at elevated levels. The oxidized forms of Se, selenate [Se(VI)] and selenite [Se(IV)], are more mobile, toxic, and bioavailable than the reduced forms of Se such as volatile or solid phases. Thus, selenate and selenite pose a greater threat to ecosystems and human health. As current Se remediation technologies have varying efficiencies and costs, novel strategies to remove elevated Se levels from environments impacted by anthropogenic activities are desirable. Some common soil fungi quickly remove Se (IV and VI) from solution by aerobic reduction to solid or volatile forms. Here, we perform bench-scale culture experiments of two Se-reducing Ascomycota to determine their Se removal capacity in growth media conditions containing either Se(IV) or Se(VI) as well as in Se-containing municipal (∼25 μg/L Se) and industrial (∼2000 μg/L Se) wastewaters. Dissolved Se was measured throughout the experiments to assess Se concentration and removal rates. Additionally, solid-associated Se was quantified at the end of each experiment to determine the amount of Se removed to solid phases (e.g., Se(0) nanoparticles, biomass-adsorbed Se, or internal organic selenoproteins). Results show that under optimal conditions, fungi more efficiently remove Se(IV) from solution compared to Se(VI). Additionally, both fungi remove a higher percentage of Se from the filtered municipal wastewater compared to the industrial wastewater, though cultures in industrial wastewater retained a greater amount of solid-associated Se. Additional wastewater experiments were conducted with supplemental carbohydrate- or glycerin-based carbon products and additional nitrogen- and phosphorous-containing nutrients in some cases to enhance fungal growth. Relative to unamended wastewater experiments, supplemental carbohydrates promote Se removal from municipal wastewater but minimally impact industrial wastewater removal. This demonstrates that carbon availability and source impacts fungal Se reduction and removal from solution. Calculations to assess the leaching potential of solid-associated Se from fungal biomass show that wastewater Se release will not exceed regulatory limits. This study highlights the considerable potential for the mycoremediation of Se-contaminated wastewaters.
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Affiliation(s)
- Mary C Sabuda
- Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, United States.,BioTechnology Institute, University of Minnesota, Saint Paul, MN, United States
| | - Carla E Rosenfeld
- Section of Minerals and Earth Sciences, Carnegie Museum of Natural History, Pittsburgh, PA, United States
| | | | - Katie Schroeder
- Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, United States.,Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, MN, United States
| | | | - Cara M Santelli
- Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, United States.,BioTechnology Institute, University of Minnesota, Saint Paul, MN, United States
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14
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Butz ZJ, Borgognoni K, Nemeth R, Nilsson ZN, Ackerson CJ. Metalloid Reductase Activity Modified by a Fused Se 0 Binding Peptide. ACS Chem Biol 2020; 15:1987-1995. [PMID: 32568515 DOI: 10.1021/acschembio.0c00387] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A selenium nanoparticle binding peptide was isolated from a phage display library and genetically fused to a metalloid reductase that reduces selenite (SeO32-) to a Se0 nanoparticle (SeNP) form. The fusion of the Se binding peptide to the metalloid reductase regulates the size of the resulting SeNP to ∼35 nm average diameter, where without the peptide, SeNPs grow to micron sized polydisperse precipitates. The SeNP product remains associated with the enzyme/peptide fusion. The Se binding peptide fusion to the enzyme increases the enzyme's SeO32- reductase activity. Size control of particles was diminished if the Se binding peptide was only added exogenously to the reaction mixture. The enzyme-peptide construct shows preference for binding smaller SeNPs. The peptide-SeNP interaction is attributed to His based ligation that results in a peptide conformational change on the basis of Raman spectroscopy.
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Affiliation(s)
- Zachary J. Butz
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Kanda Borgognoni
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Richard Nemeth
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Zach N. Nilsson
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Christopher J. Ackerson
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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15
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Poblete-Morales M, Carvajal D, Almasia R, Michea S, Cantillana C, Levican A, Silva-Moreno E. Pseudomonas atacamensis sp. nov., isolated from the rhizosphere of desert bloom plant in the region of Atacama, Chile. Antonie van Leeuwenhoek 2020; 113:1201-1211. [DOI: 10.1007/s10482-020-01427-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Accepted: 05/06/2020] [Indexed: 12/22/2022]
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16
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Zhang Y, Kuroda M, Nakatani Y, Soda S, Ike M. Removal of selenite from artificial wastewater with high salinity by activated sludge in aerobic sequencing batch reactors. J Biosci Bioeng 2019; 127:618-624. [DOI: 10.1016/j.jbiosc.2018.11.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 11/01/2018] [Accepted: 11/02/2018] [Indexed: 10/27/2022]
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17
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Zhang J, Wang Y, Shao Z, Li J, Zan S, Zhou S, Yang R. Two selenium tolerant Lysinibacillus sp. strains are capable of reducing selenite to elemental Se efficiently under aerobic conditions. J Environ Sci (China) 2019; 77:238-249. [PMID: 30573088 DOI: 10.1016/j.jes.2018.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 07/31/2018] [Accepted: 08/03/2018] [Indexed: 06/09/2023]
Abstract
Microbes play important roles in the transport and transformation of selenium (Se) in the environment, thereby influencing plant resistance to Se and Se accumulation in plant. The objectives are to characterize the bacteria with high Se tolerance and reduction capacity and explore the significance of microbial origins on their Se tolerance, reduction rate and efficiency. Two bacterial strains were isolated from a naturally occurred Se-rich soil at tea orchard in southern Anhui Province, China. The reduction kinetics of selenite was investigated and the reducing product was characterized using scanning electron microscopy and transmission electron microscopy-energy dispersive spectroscopy. The bacteria were identified as Lysinibacillus xylanilyticus and Lysinibacillus macrolides, respectively, using morphological, physiological and molecular methods. The results showed that the minimal inhibitory concentrations (MICs) of selenite for L. xylanilyticus and L. macrolides were 120 and 220 mmol/L, respectively, while MICs of selenate for L. xylanilyticus and L. macrolides were 800 and 700 mmol/L, respectively. Both strains aerobically reduced selenite with an initial concentration of 1.0 mmol/L to elemental Se nanoparticles (SeNPs) completely within 36 hr. Biogenic SeNPs were observed both inside and outside the cells suggesting either an intra- or extracellular reduction process. Our study implied that the microbes from Se-rich environments were more tolerant to Se and generally quicker and more efficient than those from Se-free habitats in the reduction of Se oxyanions. The bacterial strains with high Se reduction capacity and the biological synthesized SeNPs would have potential applications in agriculture, food, environment and medicine.
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Affiliation(s)
- Ju Zhang
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China
| | - Yue Wang
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China
| | - Zongyuan Shao
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China
| | - Jing Li
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China
| | - Shuting Zan
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, China
| | - Shoubiao Zhou
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, China; Institute of Functional Food, Anhui Normal University, Wuhu 241002, China
| | - Ruyi Yang
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, China; Institute of Functional Food, Anhui Normal University, Wuhu 241002, China.
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18
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Ueki T, Fujie M, Romaidi, Satoh N. Symbiotic bacteria associated with ascidian vanadium accumulation identified by 16S rRNA amplicon sequencing. Mar Genomics 2019; 43:33-42. [DOI: 10.1016/j.margen.2018.10.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/10/2018] [Accepted: 10/29/2018] [Indexed: 01/31/2023]
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19
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Plant selenium hyperaccumulation- Ecological effects and potential implications for selenium cycling and community structure. Biochim Biophys Acta Gen Subj 2018; 1862:2372-2382. [DOI: 10.1016/j.bbagen.2018.04.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 04/06/2018] [Accepted: 04/23/2018] [Indexed: 11/23/2022]
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20
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Wang Y, Shu X, Zhou Q, Fan T, Wang T, Chen X, Li M, Ma Y, Ni J, Hou J, Zhao W, Li R, Huang S, Wu L. Selenite Reduction and the Biogenesis of Selenium Nanoparticles by Alcaligenesfaecalis Se03 Isolated from the Gut of Monochamus alternatus (Coleoptera: Cerambycidae). Int J Mol Sci 2018; 19:ijms19092799. [PMID: 30227664 PMCID: PMC6164237 DOI: 10.3390/ijms19092799] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 09/14/2018] [Accepted: 09/14/2018] [Indexed: 02/05/2023] Open
Abstract
In this study, a bacterial strain exhibiting high selenite (Na2SeO3) tolerance and reduction capacity was isolated from the gut of Monochamus alternatus larvae and identified as Alcaligenes faecalis Se03. The isolate exhibited extreme tolerance to selenite (up to 120 mM) when grown aerobically. In the liquid culture medium, it was capable of reducing nearly 100% of 1.0 and 5.0 mM Na2SeO3 within 24 and 42 h, respectively, leading to the formation of selenium nanoparticles (SeNPs). Electron microscopy and energy dispersive X-ray analysis demonstrated that A. faecalis Se03 produced spherical electron-dense SeNPs with an average hydrodynamic diameter of 273.8 ± 16.9 nm, localized mainly in the extracellular space. In vitro selenite reduction activity and real-time PCR indicated that proteins such as sulfite reductase and thioredoxin reductase present in the cytoplasm were likely to be involved in selenite reduction and the SeNPs synthesis process in the presence of NADPH or NADH as electron donors. Finally, using Fourier-transform infrared spectrometry, protein and lipid residues were detected on the surface of the biogenic SeNPs. Based on these observations, A. faecalis Se03 has the potential to be an eco-friendly candidate for the bioremediation of selenium-contaminated soil/water and a bacterial catalyst for the biogenesis of SeNPs.
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Affiliation(s)
- Yuting Wang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
- The Sericultural Research Institute, Anhui Academy of Agricultural Science, Hefei 230061, China.
| | - Xian Shu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
| | - Qing Zhou
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
| | - Tao Fan
- The Sericultural Research Institute, Anhui Academy of Agricultural Science, Hefei 230061, China.
| | - Taichu Wang
- The Sericultural Research Institute, Anhui Academy of Agricultural Science, Hefei 230061, China.
| | - Xue Chen
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
| | - Minghao Li
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
- Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Yuhan Ma
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Jun Ni
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Jinyan Hou
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Weiwei Zhao
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Ruixue Li
- The Sericultural Research Institute, Anhui Academy of Agricultural Science, Hefei 230061, China.
| | - Shengwei Huang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Lifang Wu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- The Sericultural Research Institute, Anhui Academy of Agricultural Science, Hefei 230061, China.
- Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
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Lindblom SD, Wangeline AL, Valdez Barillas JR, Devilbiss B, Fakra SC, Pilon-Smits EAH. Fungal Endophyte Alternaria tenuissima Can Affect Growth and Selenium Accumulation in Its Hyperaccumulator Host Astragalus bisulcatus. FRONTIERS IN PLANT SCIENCE 2018; 9:1213. [PMID: 30177943 PMCID: PMC6109757 DOI: 10.3389/fpls.2018.01213] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 07/27/2018] [Indexed: 05/13/2023]
Abstract
Endophytes can enhance plant stress tolerance by promoting growth and affecting elemental accumulation, which may be useful in phytoremediation. In earlier studies, up to 35% elemental selenium (Se0) was found in Se hyperaccumulator Astragalus bisulcatus. Since Se0 can be produced by microbes, the plant Se0 was hypothesized to be microbe-derived. Here we characterize a fungal endophyte of A. bisulcatus named A2. It is common in seeds from natural seleniferous habitat containing 1,000-10,000 mg kg-1 Se. We identified A2 as Alternaria tenuissima via 18S rRNA sequence analysis and morphological characterization. X-ray microprobe analysis of A. bisulcatus seeds that did or did not harbor Alternaria, showed that both contained >90% organic seleno-compounds with C-Se-C configuration, likely methylselenocysteine and glutamyl-methylselenocysteine. The seed Se was concentrated in the embryo, not the seed coat. X-ray microprobe analysis of A2 in pure culture showed the fungus produced Se0 when supplied with selenite, but accumulated mainly organic C-Se-C compounds when supplied with selenate. A2 was completely resistant to selenate up to 300 mg L-1, moderately resistant to selenite (50% inhibition at ∼50 mg Se L-1), but relatively sensitive to methylselenocysteine and to Se extracted from A. bisulcatus (50% inhibition at 25 mg Se L-1). Four-week old A. bisulcatus seedlings derived from surface-sterilized seeds containing endophytic Alternaria were up to threefold larger than seeds obtained from seeds not showing evidence of fungal colonization. When supplied with Se, the Alternaria-colonized seedlings had lower shoot Se and sulfur levels than seedlings from uncolonized seeds. In conclusion, A. tenuissima may contribute to the Se0 observed earlier in A. bisulcatus, and affect host growth and Se accumulation. A2 is sensitive to the Se levels found in its host's tissues, but may avoid Se toxicity by occupying low-Se areas (seed coat, apoplast) and converting plant Se to non-toxic Se0. These findings illustrate the potential for hyperaccumulator endophytes to affect plant properties relevant for phytoremediation. Facultative endophytes may also be applicable in bioremediation and biofortification, owing to their capacity to turn toxic inorganic forms of Se into non-toxic or even beneficial, organic forms with anticarcinogenic properties.
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Affiliation(s)
- Stormy D. Lindblom
- Department of Biology, Colorado State University, Fort Collins, CO, United States
| | - Ami L. Wangeline
- Department of Biology, Laramie County Community College, Cheyenne, WY, United States
| | - Jose R. Valdez Barillas
- Department of Biology, Colorado State University, Fort Collins, CO, United States
- Department of Sciences and Mathematics, Texas A&M University-San Antonio, San Antonio, TX, United States
| | - Berthal Devilbiss
- Department of Biology, Laramie County Community College, Cheyenne, WY, United States
| | - Sirine C. Fakra
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
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Formation of Se(0), Te(0), and Se(0)-Te(0) nanostructures during simultaneous bioreduction of selenite and tellurite in a UASB reactor. Appl Microbiol Biotechnol 2018; 102:2899-2911. [PMID: 29399711 DOI: 10.1007/s00253-018-8781-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 01/11/2018] [Accepted: 01/12/2018] [Indexed: 10/18/2022]
Abstract
Simultaneous removal of selenite and tellurite from synthetic wastewater was achieved through microbial reduction in a lab-scale upflow anaerobic sludge blanket reactor operated with 12 h hydraulic retention time at 30 °C and pH 7 for 120 days. Lactate was supplied as electron donor at an organic loading rate of 528 or 880 mg COD L-1 day-1. The reactor was initially fed with a synthetic influent containing 0.05 mM selenite and tellurite each (phase I, day 1-60) and subsequently with 0.1 mM selenite and tellurite each (phase II, day 61-120). At the end of phase I, selenite and tellurite removal efficiencies were 93 and 96%, respectively. The removal percentage dropped to 87 and 81% for selenite and tellurite, respectively, at the beginning of phase II because of the increased influent concentrations. The removal efficiencies of both selenite and tellurite were gradually restored within 20 days and stabilized at ≥ 97% towards the end of the experiment. Powder X-ray diffraction and Raman spectroscopy confirmed the formation of biogenic Se(0), Te(0), and Se(0)-Te(0) nanostructures. Scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy showed aggregates comprising of Se(0), Te(0), and Se-Te nanostructures embedded in a layer of extracellular polymeric substances (EPS). Infrared spectroscopy confirmed the presence of chemical signatures of the EPS which capped the nanoparticle aggregates that had been formed and immobilized in the granular sludge. This study suggests a model for technologies for remediation of effluents containing Se and Te oxyanions coupled with biorecovery of bimetal(loid) nanostructures.
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Wadgaonkar SL, Nancharaiah YV, Esposito G, Lens PNL. Environmental impact and bioremediation of seleniferous soils and sediments. Crit Rev Biotechnol 2018; 38:941-956. [DOI: 10.1080/07388551.2017.1420623] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | - Yarlagadda V. Nancharaiah
- Biofouling and Biofilm Processes Section of Water and Steam Chemistry Division, Bhabha Atomic Research Centre, Kalpakkam, Tamil Nadu, India
- Homi Bhabha National Institute, Anushakti Nagar Complex, Mumbai, Maharashtra, India
| | - Giovanni Esposito
- Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Cassino, FR, Italy
| | - Piet N. L. Lens
- UNESCO IHE Institute for Water Education, Delft, The Netherlands
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Zonaro E, Piacenza E, Presentato A, Monti F, Dell'Anna R, Lampis S, Vallini G. Ochrobactrum sp. MPV1 from a dump of roasted pyrites can be exploited as bacterial catalyst for the biogenesis of selenium and tellurium nanoparticles. Microb Cell Fact 2017; 16:215. [PMID: 29183326 PMCID: PMC5704588 DOI: 10.1186/s12934-017-0826-2] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 11/16/2017] [Indexed: 11/10/2022] Open
Abstract
Background Bacteria have developed different mechanisms for the transformation of metalloid oxyanions to non-toxic chemical forms. A number of bacterial isolates so far obtained in axenic culture has shown the ability to bioreduce selenite and tellurite to the elemental state in different conditions along with the formation of nanoparticles—both inside and outside the cells—characterized by a variety of morphological features. This reductive process can be considered of major importance for two reasons: firstly, toxic and soluble (i.e. bioavailable) compounds such as selenite and tellurite are converted to a less toxic chemical forms (i.e. zero valent state); secondly, chalcogen nanoparticles have attracted great interest due to their photoelectric and semiconducting properties. In addition, their exploitation as antimicrobial agents is currently becoming an area of intensive research in medical sciences. Results In the present study, the bacterial strain Ochrobactrum sp. MPV1, isolated from a dump of roasted arsenopyrites as residues of a formerly sulfuric acid production near Scarlino (Tuscany, Italy) was analyzed for its capability of efficaciously bioreducing the chalcogen oxyanions selenite (SeO32−) and tellurite (TeO32−) to their respective elemental forms (Se0 and Te0) in aerobic conditions, with generation of Se- and Te-nanoparticles (Se- and TeNPs). The isolate could bioconvert 2 mM SeO32− and 0.5 mM TeO32− to the corresponding Se0 and Te0 in 48 and 120 h, respectively. The intracellular accumulation of nanomaterials was demonstrated through electron microscopy. Moreover, several analyses were performed to shed light on the mechanisms involved in SeO32− and TeO32− bioreduction to their elemental states. Results obtained suggested that these oxyanions are bioconverted through two different mechanisms in Ochrobactrum sp. MPV1. Glutathione (GSH) seemed to play a key role in SeO32− bioreduction, while TeO32− bioconversion could be ascribed to the catalytic activity of intracellular NADH-dependent oxidoreductases. The organic coating surrounding biogenic Se- and TeNPs was also characterized through Fourier-transform infrared spectroscopy. This analysis revealed interesting differences among the NPs produced by Ochrobactrum sp. MPV1 and suggested a possible different role of phospholipids and proteins in both biosynthesis and stabilization of such chalcogen-NPs. Conclusions In conclusion, Ochrobactrum sp. MPV1 has demonstrated to be an ideal candidate for the bioconversion of toxic oxyanions such as selenite and tellurite to their respective elemental forms, producing intracellular Se- and TeNPs possibly exploitable in biomedical and industrial applications.![]()
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Affiliation(s)
- Emanuele Zonaro
- Department of Biotechnology, University of Verona, Strada le Grazie 15, 37134, Verona, Italy
| | - Elena Piacenza
- Department of Biotechnology, University of Verona, Strada le Grazie 15, 37134, Verona, Italy.,Microbial Biochemistry Laboratory, Department of Biological Sciences, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada
| | - Alessandro Presentato
- Department of Biotechnology, University of Verona, Strada le Grazie 15, 37134, Verona, Italy
| | - Francesca Monti
- Department of Computer Science, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy
| | - Rossana Dell'Anna
- Micro Nano Facility, Fondazione Bruno Kessler, Via Sommarive 18, 38123, Povo (TN), Italy
| | - Silvia Lampis
- Department of Biotechnology, University of Verona, Strada le Grazie 15, 37134, Verona, Italy.
| | - Giovanni Vallini
- Department of Biotechnology, University of Verona, Strada le Grazie 15, 37134, Verona, Italy
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Fernández-Llamosas H, Castro L, Blázquez ML, Díaz E, Carmona M. Speeding up bioproduction of selenium nanoparticles by using Vibrio natriegens as microbial factory. Sci Rep 2017; 7:16046. [PMID: 29167550 PMCID: PMC5700131 DOI: 10.1038/s41598-017-16252-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 11/10/2017] [Indexed: 11/09/2022] Open
Abstract
Selenium and selenium nanoparticles (SeNPs) are extensively used in biomedicine, electronics and some other industrial applications. The bioproduction of SeNPs is gaining interest as a green method to manufacture these biotechnologically relevant products. Several microorganisms have been used for the production of SeNPs either under aerobic or anaerobic conditions. Vibrio natriegens is a non-pathogenic fast-growing bacterium, easily cultured in different carbon sources and that has recently been engineered for easy genetic manipulation in the laboratory. Here we report that V. natriegens was able to perfectly grow aerobically in the presence of selenite concentrations up to 15 mM with a significant survival still observed at concentrations as high as 100 mM selenite. Electron microscopy and X-ray spectroscopy analyses demonstrate that V. natriegens cells growing aerobically in selenite-containing LB medium at 30 °C produced spherical electron-dense SeNPs whose size ranged from 100-400 nm. Selenite reduction just started at the beginning of the exponential growth phase and the release of SeNPs was observed after cell lysis. Remarkably, V. natriegens produced SeNPs faster than other described microorganisms that were proposed as model bioreactors for SeNPs production. Thus, the fast-growing V. natriegens bacterium becomes a suitable biocatalyst for bioremediation of selenite and for speeding-up the eco-friendly synthesis of SeNPs.
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Affiliation(s)
- Helga Fernández-Llamosas
- Environmental Biology Department, Centro de Investigaciones Biológicas-CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Laura Castro
- Department of Material Science and Metallurgical Engineering, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040, Madrid, Spain
| | - María Luisa Blázquez
- Department of Material Science and Metallurgical Engineering, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040, Madrid, Spain
| | - Eduardo Díaz
- Environmental Biology Department, Centro de Investigaciones Biológicas-CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Manuel Carmona
- Environmental Biology Department, Centro de Investigaciones Biológicas-CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain.
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26
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Mal J, Nancharaiah YV, van Hullebusch ED, Lens PNL. Biological removal of selenate and ammonium by activated sludge in a sequencing batch reactor. BIORESOURCE TECHNOLOGY 2017; 229:11-19. [PMID: 28092731 DOI: 10.1016/j.biortech.2016.12.112] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/26/2016] [Accepted: 12/31/2016] [Indexed: 06/06/2023]
Abstract
Wastewaters contaminated by both selenium and ammonium need to be treated prior to discharge into natural water bodies, but there are no studies on the simultaneous removal of selenium and ammonium. A sequencing batch reactor (SBR) was inoculated with activated sludge and operated for 90days. The highest ammonium removal efficiency achieved was 98%, while the total nitrogen removal was 75%. Nearly a complete chemical oxygen demand removal efficiency was attained after 16days of operation, whereas complete selenate removal was achieved only after 66days. The highest total Se removal efficiency was 97%. Batch experiments showed that the total Se in the aqueous phase decreased by 21% with increasing initial ammonium concentration from 50 to 100mgL-1. This study showed that SBR can remove both selenate and ammonium via, respectively, bioreduction and partial nitrification-denitrification and thus offer possibilities for treating selenium and ammonium contaminated effluents.
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Affiliation(s)
- J Mal
- UNESCO-IHE, Westvest 7, 2611 AX Delft, The Netherlands; Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France.
| | - Y V Nancharaiah
- Biofouling and Biofilm Process Section, Water and Steam Chemistry Division, Bhabha Atomic Research Centre, Kalpakkam 603102, Tamil Nadu, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India
| | - E D van Hullebusch
- UNESCO-IHE, Westvest 7, 2611 AX Delft, The Netherlands; Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France
| | - P N L Lens
- UNESCO-IHE, Westvest 7, 2611 AX Delft, The Netherlands; Department of Chemistry and Bioengineering, Tampere University of Technology, P.O. Box 541, Tampere, Finland
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27
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Staicu LC, Morin-Crini N, Crini G. Desulfurization: Critical step towards enhanced selenium removal from industrial effluents. CHEMOSPHERE 2017; 172:111-119. [PMID: 28063313 DOI: 10.1016/j.chemosphere.2016.12.132] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 12/21/2016] [Accepted: 12/26/2016] [Indexed: 06/06/2023]
Abstract
Selenium (Se) removal from synthetic solutions and from real Flue Gas Desulfurization (FGD) wastewater generated by a coal-fired power plant was studied for the first time using a commercial iron oxide impregnated strong base anion exchange resin, Purolite® FerrIX A33E. In synthetic solutions, the resin showed high affinity for selenate and selenite, while sulfate exhibited a strong competition for both oxyanions. The FGD wastewater investigated is a complex system that contains Se (∼1200 μg L-1), SO42- (∼1.1 g L-1), Cl- (∼9.5 g L-1), and Ca2+ (∼5 g L-1), alongside a broad spectrum of toxic trace metals including Cd, Cr, Hg, Ni, and Zn. The resin performed poorly against Se in the raw FGD wastewater and showed moderate to good removal of several trace elements such as Cd, Cr, Hg, and Zn. In FGD effluent, sulfate was identified as a powerful competing anion for Se, having high affinity for the exchange active sites of the resin. The desulfurization of the FGD effluent using BaCl2 led to the increase in Se removal from 3% (non-desulfurized effluent) to 80% (desulfurized effluent) by combined precipitation and ion exchange treatment. However, complete desulfurization using equimolar BaCl2 could not be achieved due to the presence of bicarbonate that acts as a sulfate competitor for barium. In addition to selenium and sulfate removal, several toxic metals were efficiently removed (Cd: 91%; Cr: 100%; Zn: 99%) by the combined (desulfurization and ion exchange) treatment.
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Affiliation(s)
- Lucian C Staicu
- Université de Bourgogne Franche-Comté, UFR Sciences & Techniques, UMR Chrono-environnement, 6249, Besançon, France; University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science, Bucharest, Romania.
| | - Nadia Morin-Crini
- Université de Bourgogne Franche-Comté, UFR Sciences & Techniques, UMR Chrono-environnement, 6249, Besançon, France
| | - Grégorio Crini
- Université de Bourgogne Franche-Comté, UFR Sciences & Techniques, UMR Chrono-environnement, 6249, Besançon, France
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28
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Schiavon M, Pilon-Smits EAH. Selenium Biofortification and Phytoremediation Phytotechnologies: A Review. JOURNAL OF ENVIRONMENTAL QUALITY 2017; 46:10-19. [PMID: 28177413 DOI: 10.2134/jeq2016.09.0342] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The element selenium (Se) is both essential and toxic for most life forms, with a narrow margin between deficiency and toxicity. Phytotechnologies using plants and their associated microbes can address both of these problems. To prevent Se toxicity due to excess environmental Se, plants may be used to phytoremediate Se from soil or water. To alleviate Se deficiency in humans or livestock, crops may be biofortified with Se. These two technologies may also be combined: Se-enriched plant material from phytoremediation could be used as green fertilizer or as fortified food. Plants may also be used to "mine" Se from seleniferous soils. The efficiency of Se phytoremediation and biofortification may be further optimized. Research in the past decades has provided a wealth of knowledge regarding the mechanisms by which plants take up, metabolize, accumulate, and volatilize Se and the role plant-associated microbes play in these processes. Furthermore, ecological studies have revealed important effects of plant Se on interactions with herbivores, detrivores, pollinators, neighboring vegetation, and the plant microbiome. All this knowledge can be exploited in phytotechnology programs to optimize plant Se accumulation, transformation, volatilization, and/or tolerance via plant breeding, genetic engineering, and tailored agronomic practices.
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29
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Khoei NS, Lampis S, Zonaro E, Yrjälä K, Bernardi P, Vallini G. Insights into selenite reduction and biogenesis of elemental selenium nanoparticles by two environmental isolates of Burkholderia fungorum. N Biotechnol 2016; 34:1-11. [PMID: 27717878 DOI: 10.1016/j.nbt.2016.10.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 07/11/2016] [Accepted: 10/03/2016] [Indexed: 11/30/2022]
Abstract
Microorganisms capable of transforming toxic selenium oxyanions into non-toxic elemental selenium (Se°) may be considered as biocatalysts for the production of selenium nanoparticles (SeNPs), eventually exploitable in different biotechnological applications. Two Burkholderia fungorum strains (B. fungorum DBT1 and B. fungorum 95) were monitored during their growth for both capacity and efficiency of selenite (SeO32-) reduction and elemental selenium formation. Both strains are environmental isolates in origin: B. fungorum DBT1 was previously isolated from an oil refinery drainage, while B. fungorum 95 has been enriched from inner tissues of hybrid poplars grown in a soil contaminated by polycyclic aromatic hydrocarbons. Our results showed that B. fungorum DBT1 is able to reduce 0.5mM SeO32- to Se° when cultured aerobically in liquid medium at 27°C, while B. fungorum 95 can reduce more than 1mM SeO32- to Se° within 96h under the same growth conditions, with the appearance of SeNPs in cultures of both bacterial strains. Biogenic SeNPs were spherical, with pH-dependent charge and an average hydrodynamic diameter of 170nm and 200nm depending on whether they were produced by B. fungorum 95 or B. fungorum DBT1, respectively. Electron microscopy analyses evidenced that Se nanoparticles occurred intracellularly and extracellularly. The mechanism of SeNPs formation can be tentatively attributed to cytoplasmic enzymatic activation mediated by electron donors. Biogenic nanoparticles were then probably released outside the bacterial cells as a consequence of a secretory process or cell lysis. Nevertheless, formation of elemental selenium nanoparticles under aerobic conditions by B. fungorum DBT1 and B. fungorum 95 is likely due to intracellular reduction mechanisms. Biomedical and other high tech sectors might exploit these biogenic nanoparticles in the near future, once fully characterized and tested for their multiple properties.
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Affiliation(s)
- Nazanin Seyed Khoei
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy.
| | - Silvia Lampis
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy.
| | - Emanuele Zonaro
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Kim Yrjälä
- MEM-group, Department of Biosciences, University of Helsinki, 00014 Helsinki, Finland
| | - Paolo Bernardi
- Department of Neurological and Movement Sciences, University of Verona, Strada Le Grazie 8, 37134 Verona, Italy
| | - Giovanni Vallini
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
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Miller NT, Fuller D, Couger MB, Bagazinski M, Boyne P, Devor RC, Hanafy RA, Budd C, French DP, Hoff WD, Youssef N. Draft genome sequence of Pseudomonas moraviensis strain Devor implicates metabolic versatility and bioremediation potential. GENOMICS DATA 2016; 9:154-9. [PMID: 27583206 PMCID: PMC4993851 DOI: 10.1016/j.gdata.2016.08.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 08/02/2016] [Indexed: 11/26/2022]
Abstract
Pseudomonas moraviensis is a predominant member of soil environments. We here report on the genomic analysis of Pseudomonas moraviensis strain Devor that was isolated from a gate at Oklahoma State University, Stillwater, OK, USA. The partial genome of Pseudomonas moraviensis strain Devor consists of 6016489 bp of DNA with 5290 protein-coding genes and 66 RNA genes. This is the first detailed analysis of a P. moraviensis genome. Genomic analysis revealed metabolic versatility with genes involved in the metabolism and transport of fructose, xylose, mannose and all amino acids with the exception of tryptophan and valine, implying that the organism is a versatile heterotroph. The genome of P. moraviensis strain Devor was rich in transporters and, based on COG analysis, did not cluster closely with P. moraviensis R28-S genome, the only previous report of a P. moraviensis genome with a native mercury resistance plasmid.
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Affiliation(s)
- Neil T Miller
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Danny Fuller
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - M B Couger
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Mark Bagazinski
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Philip Boyne
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Robert C Devor
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Radwa A Hanafy
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Connie Budd
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Donald P French
- Department of Integrative Biology, Oklahoma State University, Stillwater, OK, United States
| | - Wouter D Hoff
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
| | - Noha Youssef
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, United States
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Ni TW, Staicu LC, Nemeth RS, Schwartz CL, Crawford D, Seligman JD, Hunter WJ, Pilon-Smits EAH, Ackerson CJ. Progress toward clonable inorganic nanoparticles. NANOSCALE 2015; 7:17320-7. [PMID: 26350616 PMCID: PMC4785824 DOI: 10.1039/c5nr04097c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Pseudomonas moraviensis stanleyae was recently isolated from the roots of the selenium (Se) hyperaccumulator plant Stanleya pinnata. This bacterium tolerates normally lethal concentrations of SeO3(2-) in liquid culture, where it also produces Se nanoparticles. Structure and cellular ultrastructure of the Se nanoparticles as determined by cellular electron tomography shows the nanoparticles as intracellular, of narrow dispersity, symmetrically irregular and without any observable membrane or structured protein shell. Protein mass spectrometry of a fractionated soluble cytosolic material with selenite reducing capability identified nitrite reductase and glutathione reductase homologues as NADPH dependent candidate enzymes for the reduction of selenite to zerovalent Se nanoparticles. In vitro experiments with commercially sourced glutathione reductase revealed that the enzyme can reduce SeO3(2-) (selenite) to Se nanoparticles in an NADPH-dependent process. The disappearance of the enzyme as determined by protein assay during nanoparticle formation suggests that glutathione reductase is associated with or possibly entombed in the nanoparticles whose formation it catalyzes. Chemically dissolving the nanoparticles releases the enzyme. The size of the nanoparticles varies with SeO3(2-) concentration, varying in size form 5 nm diameter when formed at 1.0 μM [SeO3(2-)] to 50 nm maximum diameter when formed at 100 μM [SeO3(2-)]. In aggregate, we suggest that glutathione reductase possesses the key attributes of a clonable nanoparticle system: ion reduction, nanoparticle retention and size control of the nanoparticle at the enzyme site.
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Affiliation(s)
- Thomas W Ni
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
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