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Asefaw BK, Walia N, Stroupe ME, Chen H, Tang Y. Unraveling mechanisms of selenium recovery by facultative anaerobic bacterium Azospira sp. A9D-23B in distinct reactor configurations. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-35140-6. [PMID: 39331294 DOI: 10.1007/s11356-024-35140-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Accepted: 09/21/2024] [Indexed: 09/28/2024]
Abstract
Microbial processes are crucial in the redox transformations of toxic selenium oxyanions. This study focused on isolating an efficient selenate-reducing strain, Azospira sp. A9D-23B, and evaluating its capability to recover extracellular selenium nanoparticles (SeNPs) from selenium-laden wastewater in different reactor setups. Analysis using transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX) revealed significantly higher extracellular SeNPs production (99%) on the biocathode of the bioelectrochemical (BEC) reactor compared to the conventional bioreactor (65%). Further investigations into the selenate reductase activity of strain A9D-23B revealed distinct mechanisms of selenate reduction in BEC and conventional bioreactor settings. Notably, selenate reductases associated with the outer membrane and periplasm displayed higher activity (18.31 ± 3.8 µmol/mg-min) on the BEC reactor's biocathode compared to the upflow anaerobic conventional bioreactor (3.24 ± 2.9 µmol/mg-min). Conversely, the selenate reductases associated with the inner membrane and cytoplasm exhibited lower activity (5.82 ± 2.2 µmol/mg-min) on the BEC reactor's biocathode compared to the conventional bioreactor (9.18 ± 1.6 µmol/mg-min). However, the comparable kinetic parameter ( K m ) across cellular fractions in both reactors suggest that SeNP localization was influenced by enzyme activity rather than selenate affinity. Overall, the mechanism involved in selenate reduction to SeNPs and the strain's efficiency in detoxifying selenate below levels regulated by the U.S. Environmental Protection Agency has broad implications for sustainable environmental remediation strategies.
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Affiliation(s)
- Benhur Kessete Asefaw
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, FL, 32310, USA
| | - Nidhi Walia
- Department of Biological Science, Florida State University, 91 Chieftain Way, Tallahassee, FL, 32306, USA
- Institute of Molecular Biophysics, Florida State University, 91 Chieftain Way, Tallahassee, FL, 32306, USA
| | - Margaret Elizabeth Stroupe
- Department of Biological Science, Florida State University, 91 Chieftain Way, Tallahassee, FL, 32306, USA
- Institute of Molecular Biophysics, Florida State University, 91 Chieftain Way, Tallahassee, FL, 32306, USA
| | - Huan Chen
- National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310, USA.
| | - Youneng Tang
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, FL, 32310, USA
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Xu Q, Gao S, Zhang S, Li K, Guo Y. Disruption of the cell division protein ftsK gene changes elemental selenium generation, selenite tolerance, and cell morphology in Rahnella aquatilis HX2. J Appl Microbiol 2024; 135:lxae142. [PMID: 38871681 DOI: 10.1093/jambio/lxae142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 05/31/2024] [Accepted: 06/12/2024] [Indexed: 06/15/2024]
Abstract
AIMS Some studies have indicated that the alterations in cellular morphology induced by selenite [Se(Ⅳ)] may be attributed to its inhibitory effects on cell division. However, whether the genes associated with cell division are implicated in Se(Ⅳ) metabolism remains unclear. METHODS AND RESULTS The ftsK gene in Rahnella aquatilis HX2 was mutated with an in-frame deletion strategy. The ftsK mutation strongly reduced the tolerance to selenite [Se(Ⅳ)] and the production of red elemental selenium [Se(0)] in R. aquatilis HX2, and this effect could not be attributed solely to the inhibition of cell growth. Deleting the ftsK gene also resulted in a significant decrease in bacterial growth of R. aquatilis HX2 during both exponential and stationary phases. The deletion of ftsK inhibited cell division, resulting in the development of elongated filamentous cells. Furthermore, the loss-of-function of FtsK significantly impacted the expression of seven genes linked to cell division and Se(Ⅳ) metabolism by at least 2-fold, as unveiled by real-time quantitative PCR (RT-qPCR) under Se(Ⅳ) treatment. CONCLUSIONS These findings suggest that FtsK is associated with Se(Ⅳ) tolerance and Se(0) generation and is a key player in coordinating bacterial growth and cell morphology in R. aquatilis HX2.
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Affiliation(s)
- Qiaolin Xu
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Shanshan Gao
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Sasa Zhang
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Kui Li
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Yanbin Guo
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
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3
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Li M, Yang R, Li N, Zhao S, Wei S, Zhang S, Gong J, Song J, Kim JR, He Y, Gao C, Wang Z, Cheng S. Effect of Different Selenium Species on Indole-3-Acetic Acid Activity of Selenium Nanoparticles Producing Strain Bacillus altitudinis LH18. Molecules 2024; 29:2463. [PMID: 38893338 PMCID: PMC11173968 DOI: 10.3390/molecules29112463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 05/13/2024] [Accepted: 05/16/2024] [Indexed: 06/21/2024] Open
Abstract
Acting as a growth regulator, Indole-3-acetic acid (IAA) is an important phytohormone that can be produced by several Bacillus species. However, few studies have been published on the comprehensive evaluation of the strains for practical applications and the effects of selenium species on their IAA-producing ability. The present study showed the selenite reduction strain Bacillus altitudinis LH18, which is capable of producing selenium nanoparticles (SeNPs) at a high yield in a cost-effective manner. Bio-SeNPs were systematically characterized by using DLS, zeta potential, SEM, and FTIR. The results showed that these bio-SeNPs were small in particle size, homogeneously dispersed, and highly stable. Significantly, the IAA-producing ability of strain was differently affected under different selenium species. The addition of SeNPs and sodium selenite resulted in IAA contents of 221.7 µg/mL and 91.01 µg/mL, respectively, which were 3.23 and 1.33 times higher than that of the control. This study is the first to examine the influence of various selenium species on the IAA-producing capacity of Bacillus spp., providing a theoretical foundation for the enhancement of the IAA-production potential of microorganisms.
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Affiliation(s)
- Mengjun Li
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Rui Yang
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Nana Li
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Siyang Zhao
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Shiya Wei
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Sishang Zhang
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Jue Gong
- Hubei National Se-Rich Technology Development Co., Ltd., Enshi 445000, China
| | - Jie Song
- Suixian Hongfa Native Co., Ltd., Suizhou 431500, China
| | - Jun-Ran Kim
- Plant Quarantine Technology Research and Development, Animal and Plant Quarantine Agency, Gimcheon-si 39660, Gyeongsangbuk-do, Republic of Korea
| | - Yi He
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Chao Gao
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Zhangqian Wang
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
| | - Shuiyuan Cheng
- National R&D Center for Se-Rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China (Y.H.)
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4
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Yadav P, Pandey S, Dubey SK. Selenite bioreduction with concomitant green synthesis of selenium nanoparticles by a selenite resistant EPS and siderophore producing terrestrial bacterium. Biometals 2023; 36:1027-1045. [PMID: 37119424 DOI: 10.1007/s10534-023-00503-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 04/11/2023] [Indexed: 05/01/2023]
Abstract
Environmental bacterial isolates play a very important role in bioremediation of metals and toxic metalloids. A bacterial strain with high selenite (SeO32-) tolerance and reducing capability was isolated from electronic waste dump site in Banaras Hindu University, Varanasi, India. Based on 16 S rRNA sequencing and BLAST search, this bacterial isolate was identified as Bacillus paramycoides and designated as strain MF-14. It tolerated Sodium selenite up to 110 mM when grown aerobically in LB broth and reduced selenite into elemental selenium (Se0) significantly within 24 h with concomitant biosynthesis of selenium nanoparticles as clearly revealed by brick red precipitate and specific surface plasmon resonance peak at 210 nm using UV-Visible spectrophotometer. Scanning electron microscopy (SEM) analysis of this bacterial strain exposed to 1mM and 5 mM selenite also demonstrated morphological alterations as cell enlargement due to accumulation and bioprecipitation of elemental selenium (Se0). The FTIR analysis clearly demonstrated that functional groups present on the surface of biogenic selenium nanoparticles (SeNPs) play a significant role in the stabilization and capping of SeNPs. Furthermore, these SeNPs were characterized using spectroscopic analysis involving Dynamic light scattering, zeta potential, XPS, FTIR, XRD and Raman spectroscopy which clearly revealed particle size 10-700 nm, amorphous nature, stability as well as it's oxidation state. The biochemical studies have demonstrated that membrane bound reductase enzyme may be responsible for significant reduction of selenite into elemental selenium. Therefore, we may employ Bacillus paramycoides strain MF-14 successfully for bioremediation of selenite contaminated environmental sites with concomitant green synthesis of SeNPs.
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Affiliation(s)
- Pooja Yadav
- G. E. Fogg Laboratory of Algal Biology, CAS in Botany, Banaras Hindu University, Varanasi, 221005, U.P, India
| | - Shraddha Pandey
- G. E. Fogg Laboratory of Algal Biology, CAS in Botany, Banaras Hindu University, Varanasi, 221005, U.P, India
| | - Santosh Kumar Dubey
- G. E. Fogg Laboratory of Algal Biology, CAS in Botany, Banaras Hindu University, Varanasi, 221005, U.P, India.
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
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5
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Huang S, Yu K, Wen L, Long X, Sun J, Liu Q, Zheng Z, Zheng W, Luo H, Liu J. Development and application of a new biological nano-selenium fermentation broth based on Bacillus subtilis SE201412. Sci Rep 2023; 13:2560. [PMID: 36781922 PMCID: PMC9925439 DOI: 10.1038/s41598-023-29737-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 02/09/2023] [Indexed: 02/15/2023] Open
Abstract
In order to improve the functionality and additional value of agricultural products, this study developing nano-selenium fermentation broth and established a new application strategy of bio-nano-selenium by screening and identifying selenium-rich microorganisms. We isolated a new strain from tobacco waste and named it Bacillus subtilis SE201412 (GenBank accession no. OP854680), which could aerobically grow under the condition of 66,000 mg L-1 selenite concentration, and could convert 99.19% of selenite into biological nano-selenium (BioSeNPs) within 18 h. Using strain SE201412, we industrially produced the different concentrations of fermentation broth containing 5000-3000 mg L-1 pure selenium for commercial use. The synthesized selenium nanoparticles (SeNPs) were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nanoparticle tracking analysis (NTA). TEM and SEM results showed that SeNPs were distributed outside cells. NTA assay of fermentation broth indicated that the nanoparticles were spherical with an average particle size of 126 ± 0.5 nm. Toxicity test revealed that the median lethal dose (LD50) of the fermentation broth to mice was 2710 mg kg-1, indicating its low toxicity and high safety. In addition, we applied BioSeNP fermentation broth to rice and wheat through field experiments. The results showed that the application of fermentation broth significantly increased the total selenium content and organic selenium percentage in rice and wheat grains. Our findings provide valuable reference for the development of BioSeNPs with extensive application prospects.
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Affiliation(s)
- Sisi Huang
- Institute of Agricultural Economy and Technology, Hubei Academy of Agricultural Science, Wuhan, China
| | - Kan Yu
- Institute of Agricultural Economy and Technology, Hubei Academy of Agricultural Science, Wuhan, China
| | - Liang Wen
- Institute of Agricultural Economy and Technology, Hubei Academy of Agricultural Science, Wuhan, China
| | - Xiaoling Long
- Institute of Agricultural Economy and Technology, Hubei Academy of Agricultural Science, Wuhan, China
| | - Jin Sun
- Institute of Agricultural Economy and Technology, Hubei Academy of Agricultural Science, Wuhan, China
| | - Quxiao Liu
- Hubei Hualongxike Biotechnology Ltd., Huanggang, China
| | - Zhuo Zheng
- Hubei Hualongxike Biotechnology Ltd., Huanggang, China
| | - Wei Zheng
- Institute of Agricultural Economy and Technology, Hubei Academy of Agricultural Science, Wuhan, China.
| | - Hongmei Luo
- Institute of Agricultural Economy and Technology, Hubei Academy of Agricultural Science, Wuhan, China.
| | - Jinlong Liu
- Hubei Hualongxike Biotechnology Ltd., Huanggang, China.
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6
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Long Q, Cui LK, He SB, Sun J, Chen QZ, Bao HD, Liang TY, Liang BY, Cui LY. Preparation, characteristics and cytotoxicity of green synthesized selenium nanoparticles using Paenibacillus motobuensis LY5201 isolated from the local specialty food of longevity area. Sci Rep 2023; 13:53. [PMID: 36593245 PMCID: PMC9807572 DOI: 10.1038/s41598-022-26396-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 12/14/2022] [Indexed: 01/03/2023] Open
Abstract
Selenium is an essential micronutrient element. For the extremely biotoxic of selenite, Selenium nanoparticles (SeNPs) is gaining increasing interest. In this work, a selenium-enriched strain with highly selenite-resistant (up to 173 mmol/L) was isolated from the local specialty food of longevity area and identified as Paenibacillus motobuensis (P. motobuensis) LY5201. Most of the SeNPs were accumulated extracellular. SeNPs were around spherical with a diameter of approximately 100 nm. The X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy showed that the purified SeNPs consisted of selenium and proteins. Our results suggested that P. motobuensis LY5201could be a suitable and robust biocatalyst for SeNPs synthesis. In addition, the cytotoxicity effect and the anti-invasive activity of SeNPs on the HepG2 showed an inhibitory effect on HepG2, indicating that SeNPs could be used as a potential anticancer drug.
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Affiliation(s)
- Qian Long
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China
- Department of Clinical Laboratory, The Fourth People's Hospital of Nanning, Guangxi AIDS Clinical Treatment Center (Nanning), No. 1 Erli, Changgang Road, Nanning, 530023, Guangxi, People's Republic of China
| | - Lan-Kun Cui
- School of History and Archive, Yunnan University, Kunming, 650000, Yunnan, People's Republic of China
| | - Sheng-Bin He
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China
| | - Jian Sun
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China
| | - Quan-Zhi Chen
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China
| | - Hao-Dong Bao
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China
| | - Teng-Yue Liang
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China
| | - Bao-Yue Liang
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China
| | - Lan-Yu Cui
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Guangxi Colleges and Universities, Key Laboratory of Biological Molecular Medicine Research, School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
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7
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Jia QY, Jia R, Chen CM, Wang L. Characterization of CdSe QDs biosynthesized by a recombinant Rhodopseudomonas palustris. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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8
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Alonso‐Fernandes E, Fernández‐Llamosas H, Cano I, Serrano‐Pelejero C, Castro L, Díaz E, Carmona M. Enhancing tellurite and selenite bioconversions by overexpressing a methyltransferase from
Aromatoleum
sp. CIB. Microb Biotechnol 2022; 16:915-930. [PMID: 36366868 PMCID: PMC10128142 DOI: 10.1111/1751-7915.14162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 09/21/2022] [Accepted: 10/09/2022] [Indexed: 11/13/2022] Open
Abstract
Pollution by metalloids, e.g., tellurite and selenite, is of serious environmental concern and, therefore, there is an increasing interest in searching for ecologically friendly solutions for their elimination. Some microorganisms are able to reduce toxic tellurite/selenite into less toxic elemental tellurium (Te) and selenium (Se). Here, we describe the use of the environmentally relevant β-proteobacterium Aromatoleum sp. CIB as a platform for tellurite elimination. Aromatoleum sp. CIB was shown to tolerate 0.2 and 0.5 mM tellurite at aerobic and anaerobic conditions, respectively. Furthermore, the CIB strain was able to reduce tellurite into elemental Te producing rod-shaped Te nanoparticles (TeNPs) of around 200 nm length. A search in the genome of Aromatoleum sp. CIB revealed the presence of a gene, AzCIB_0135, which encodes a new methyltransferase that methylates tellurite and also selenite. AzCIB_0135 orthologs are widely distributed in bacterial genomes. The overexpression of the AzCIB_0135 gene both in Escherichia coli and Aromatoleum sp. CIB speeds up tellurite and selenite removal, and it enhances the production of rod-shaped TeNPs and spherical Se nanoparticles (SeNPs), respectively. Thus, the overexpression of a methylase becomes a new genetic strategy to optimize bacterial catalysts for tellurite/selenite bioremediation and for the programmed biosynthesis of metallic nanoparticles of biotechnological interest.
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Affiliation(s)
- Elena Alonso‐Fernandes
- Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas Margarita Salas‐CSIC Madrid Spain
| | - Helga Fernández‐Llamosas
- Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas Margarita Salas‐CSIC Madrid Spain
| | - Irene Cano
- Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas Margarita Salas‐CSIC Madrid Spain
| | - Cristina Serrano‐Pelejero
- Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas Margarita Salas‐CSIC Madrid Spain
| | - Laura Castro
- Department of Material Science and Metallurgical Engineering, Facultad de Químicas Universidad Complutense de Madrid Madrid Spain
| | - Eduardo Díaz
- Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas Margarita Salas‐CSIC Madrid Spain
| | - Manuel Carmona
- Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas Margarita Salas‐CSIC Madrid Spain
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9
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Biogenic Selenium Nanoparticles and Their Anticancer Effects Pertaining to Probiotic Bacteria—A Review. Antioxidants (Basel) 2022; 11:antiox11101916. [PMID: 36290639 PMCID: PMC9598137 DOI: 10.3390/antiox11101916] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/20/2022] [Accepted: 09/21/2022] [Indexed: 11/16/2022] Open
Abstract
Selenium nanoparticles (SeNPs) can be produced by biogenic, physical, and chemical processes. The physical and chemical processes have hazardous effects. However, biogenic synthesis (by microorganisms) is an eco-friendly and economical technique that is non-toxic to human and animal health. The mechanism for biogenic SeNPs from microorganisms is still not well understood. Over the past two decades, extensive research has been conducted on the nutritional and therapeutic applications of biogenic SeNPs. The research revealed that biogenic SeNPs are considered novel competitors in the pharmaceutical and food industries, as they have been shown to be virtually non-toxic when used in medical practice and as dietary supplements and release only trace amounts of Se ions when ingested. Various pathogenic and probiotic/nonpathogenic bacteria are used for the biogenic synthesis of SeNPs. However, in the case of biosynthesis by pathogenic bacteria, extraction and purification techniques are required for further useful applications of these biogenic SeNPs. This review focuses on the applications of SeNPs (derived from probiotic/nonpathogenic organisms) as promising anticancer agents. This review describes that SeNPs derived from probiotic/nonpathogenic organisms are considered safe for human consumption. These biogenic SeNPs reduce oxidative stress in the human body and have also been shown to be effective against breast, prostate, lung, liver, and colon cancers. This review provides helpful information on the safe use of biogenic SeNPs and their economic importance for dietary and therapeutic purposes, especially as anticancer agents.
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10
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Jia H, Huang S, Cheng S, Zhang X, Chen X, Zhang Y, Wang J, Wu L. Novel mechanisms of selenite reduction in Bacillus subtilis 168:Confirmation of multiple-pathway mediated remediation based on transcriptome analysis. JOURNAL OF HAZARDOUS MATERIALS 2022; 433:128834. [PMID: 35398797 DOI: 10.1016/j.jhazmat.2022.128834] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 03/29/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
Selenite biotransformation by microorganisms is an effective detoxification and assimilation process. Bacillus subtilis is a probiotic bacterium that can reduce Se(IV) to SeNPs under aerobic conditions. However, current knowledge on the molecular mechanisms of selenite reduction by B. subtilis remains limited. Here, the reduction of Se(IV) by probiotic bacterium Bacillus subtilis 168 was systematically analysed, and the molecular mechanisms of selenium nanoparticle (SeNPs) formation were characterised in detail. B. subtilis 168 reduced 5.0 mM selenite by nearly 40% in 24 h, and the produced SeNPs were spherical and localised intracellularly or extracellularly. FTIR (Fourier transform infrared) spectroscopy suggested the presence of proteins, lipids, and carbohydrates on the surface of the isolated SeNPs. Transcriptome data analysis revealed that the expression of genes associated with the proline metabolism, glutamate metabolism, and sulfite metabolism pathways was significantly up-regulated. Gene mutation and complementation revealed the ability of PutC, GabD, and CysJI to reduce selenite in vivo. In vitro experiments demonstrated that PutC, GabD, and CysJI could catalyse the reduction of Se(IV) under optimal conditions using NADPH as a cofactor. To the best of our knowledge, our study is the first to demonstrate the involvement of PutC and GabD in selenite reduction. Particularly, our findings demonstrated that the reduction of Se(IV) was mediated by multiple pathways both in vivo and in vitro. Our findings thus provide novel insights into the molecular mechanisms of Se(VI) reduction in aerobic bacteria.
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Affiliation(s)
- Huiling Jia
- The Center for Ion Beam Bioengineering & Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; School of Life Science, University of Science and Technology of China, Hefei 230027 Anhui, China
| | - Shengwei Huang
- Institute of Biomedical and Health Science, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, 233100, PR China.
| | - Shuo Cheng
- The Center for Ion Beam Bioengineering & Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; School of Life Science, University of Science and Technology of China, Hefei 230027 Anhui, China
| | - Xiwen Zhang
- The Center for Ion Beam Bioengineering & Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; School of Life Science, University of Science and Technology of China, Hefei 230027 Anhui, China
| | - Xue Chen
- The Center for Ion Beam Bioengineering & Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; School of Life Science, University of Science and Technology of China, Hefei 230027 Anhui, China
| | - Yisen Zhang
- The Center for Ion Beam Bioengineering & Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Jun Wang
- The Center for Ion Beam Bioengineering & Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Lifang Wu
- The Center for Ion Beam Bioengineering & Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China; School of Life Science, University of Science and Technology of China, Hefei 230027 Anhui, China; Zhongke Taihe Experimental Station, Taihe 236626, Anhui, China.
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Ostovar M, Saberi N, Ghiassi R. Selenium contamination in water; analytical and removal methods: a comprehensive review. SEP SCI TECHNOL 2022. [DOI: 10.1080/01496395.2022.2074861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Mojtaba Ostovar
- Faculty of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran
| | - Nima Saberi
- Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, ON, Canada
| | - Reza Ghiassi
- Water and Environmental Measurement and Monitoring Labour, School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Li M, Ning P, Sun Y, Luo J, Yang J. Characteristics and Application of Rhodopseudomonas palustris as a Microbial Cell Factory. Front Bioeng Biotechnol 2022; 10:897003. [PMID: 35646843 PMCID: PMC9133744 DOI: 10.3389/fbioe.2022.897003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 04/27/2022] [Indexed: 01/20/2023] Open
Abstract
Rhodopseudomonas palustris, a purple nonsulfur bacterium, is a bacterium with the properties of extraordinary metabolic versatility, carbon source diversity and metabolite diversity. Due to its biodetoxification and biodegradation properties, R. palustris has been traditionally applied in wastewater treatment and bioremediation. R. palustris is rich in various metabolites, contributing to its application in agriculture, aquaculture and livestock breeding as additives. In recent years, R. palustris has been engineered as a microbial cell factory to produce valuable chemicals, especially photofermentation of hydrogen. The outstanding property of R. palustris as a microbial cell factory is its ability to use a diversity of carbon sources. R. palustris is capable of CO2 fixation, contributing to photoautotrophic conversion of CO2 into valuable chemicals. R. palustris can assimilate short-chain organic acids and crude glycerol from industrial and agricultural wastewater. Lignocellulosic biomass hydrolysates can also be degraded by R. palustris. Utilization of these feedstocks can reduce the industry cost and is beneficial for environment. Applications of R. palustris for biopolymers and their building blocks production, and biofuels production are discussed. Afterward, some novel applications in microbial fuel cells, microbial electrosynthesis and photocatalytic synthesis are summarized. The challenges of the application of R. palustris are analyzed, and possible solutions are suggested.
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Affiliation(s)
- Meijie Li
- Energy-Rich Compound Production by Photosynthetic Carbon Fixation Research Center, Shandong Key Lab of Applied Mycology, Qingdao Agricultural University, Qingdao, China
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Peng Ning
- Energy-Rich Compound Production by Photosynthetic Carbon Fixation Research Center, Shandong Key Lab of Applied Mycology, Qingdao Agricultural University, Qingdao, China
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Yi Sun
- Haiyang Comprehensive Administrative Law Enforcement Bureau (Agriculture), Haiyang, China
| | - Jie Luo
- Qingdao Garden Forestry Technology School, Qingdao, China
- *Correspondence: Jie Luo, ; Jianming Yang,
| | - Jianming Yang
- Energy-Rich Compound Production by Photosynthetic Carbon Fixation Research Center, Shandong Key Lab of Applied Mycology, Qingdao Agricultural University, Qingdao, China
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
- *Correspondence: Jie Luo, ; Jianming Yang,
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13
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Huang J, Jiang D, Wang M, Huang X. Highly Selenite-Tolerant Strain Proteus mirabilis QZB-2 Rapidly Reduces Selenite to Selenium Nanoparticles in the Cell Membrane. Front Microbiol 2022; 13:862130. [PMID: 35479612 PMCID: PMC9037631 DOI: 10.3389/fmicb.2022.862130] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/14/2022] [Indexed: 12/02/2022] Open
Abstract
The application of biosynthesized nano-selenium fertilizers to crops can improve their nutrient levels by increasing their selenium content. However, microorganisms with a high selenite tolerance and rapid reduction rate accompanied with the production of selenium nanoparticles (SeNPs) at the same time have seldom been reported. In this study, a bacterial strain showing high selenite resistance (up to 300 mM) was isolated from a lateritic red soil and identified as Proteus mirabilis QZB-2. This strain reduced nearly 100% of 1.0 and 2.0 mM selenite within 12 and 18 h, respectively, to produce SeNPs. QZB-2 isolate reduced SeO32– to Se0 in the cell membrane with NADPH or NADH as electron donors. Se0 was then released outside of the cell, where it formed spherical SeNPs with an average hydrodynamic diameter of 152.0 ± 10.2 nm. P. mirabilis QZB-2 could be used for SeNPs synthesis owing to its simultaneously high SeO32– tolerance and rapid reduction rate.
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Affiliation(s)
- JinLan Huang
- Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Guangxi University, Nanning, China
| | - DaiHua Jiang
- Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Guangxi University, Nanning, China
| | - MingShi Wang
- Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Guangxi University, Nanning, China
| | - XueJiao Huang
- Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Guangxi University, Nanning, China
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14
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Kessi J, Turner RJ, Zannoni D. Tellurite and Selenite: how can these two oxyanions be chemically different yet so similar in the way they are transformed to their metal forms by bacteria? Biol Res 2022; 55:17. [PMID: 35382884 PMCID: PMC8981825 DOI: 10.1186/s40659-022-00378-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 02/06/2022] [Indexed: 12/26/2022] Open
Abstract
This opinion review explores the microbiology of tellurite, TeO32- and selenite, SeO32- oxyanions, two similar Group 16 chalcogen elements, but with slightly different physicochemical properties that lead to intriguing biological differences. Selenium, Se, is a required trace element compared to tellurium, Te, which is not. Here, the challenges around understanding the uptake transport mechanisms of these anions, as reflected in the model organisms used by different groups, are described. This leads to a discussion around how these oxyanions are subsequently reduced to nanomaterials, which mechanistically, has controversies between ideas around the molecule chemistry, chemical reactions involving reduced glutathione and reactive oxygen species (ROS) production along with the bioenergetics at the membrane versus the cytoplasm. Of particular interest is the linkage of glutathione and thioredoxin chemistry from the cytoplasm through the membrane electron transport chain (ETC) system/quinones to the periplasm. Throughout the opinion review we identify open and unanswered questions about the microbial physiology under selenite and tellurite exposure. Thus, demonstrating how far we have come, yet the exciting research directions that are still possible. The review is written in a conversational manner from three long-term researchers in the field, through which to play homage to the late Professor Claudio Vásquez.
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Affiliation(s)
- Janine Kessi
- Until 2018 - Dept of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland
| | - Raymond J. Turner
- Dept of Biological Sciences, University of Calgary, Calgary, AB Canada
| | - Davide Zannoni
- Dept of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
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15
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Nikam PB, Salunkhe JD, Minkina T, Rajput VD, Kim BS, Patil SV. A review on green synthesis and recent applications of red nano Selenium. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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16
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Dou L, Mao Z, Fu Q, Chen G, Li S. Health-Related Quality of Life and Its Influencing Factors in Patients with Coronary Heart Disease in China. Patient Prefer Adherence 2022; 16:781-795. [PMID: 35370403 PMCID: PMC8965016 DOI: 10.2147/ppa.s347681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 03/08/2022] [Indexed: 11/23/2022] Open
Abstract
PURPOSE This study aimed to comprehensively evaluate Chinese coronary heart disease (CHD) patients' health-related quality of life (HRQoL) using various measures and explore influencing factors associated with HRQoL. METHODS A cross-sectional study was conducted from April to September 2019 in the General Hospital of Tianjin Medical University. A convenience sampling framework was used to successively recruit 316 inpatients with CHD. Two generic preference-based instruments (EQ-5D-5L and 15D), a disease-specific instrument (Seattle Angina Questionnaire, SAQ), and the WHO-5 well-being index (WHO-5) were administered. Tobit regression model and multiple linear regression were used for data analyses. RESULTS A total of 305 patients (mean age was 62.9) with CHD participated in this study. The mean health state utility (HSU) scores of EQ-5D-5L and 15D were 0.85 (SD=0.14) and 0.89 (SD=0.07), respectively. For EQ-5D-5L, pain/discomfort was the most frequently reported, followed by anxiety/depression. As for 15D, discomfort and symptoms was the most severely impaired dimension. For SAQ, more limitations were found in the domains of angina stability and disease perception. For WHO-5, the mean score was 16.93. Marital status, disease state and comorbidity were influencing factors associated with HRQoL, patient's subjective well-being had a positive impact on HRQoL. CONCLUSION To improve the HRQoL of CHD patients in China, more attention needs to be paid to unmarried and relapsed patients, especially those with comorbidity of hypertension. Additionally, more social support and psychological counseling should be provided to patients.
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Affiliation(s)
- Lei Dou
- Center for Health Management and Policy Research, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, People’s Republic of China
- NHC Key Laboratory of Health Economics and Policy Research (Shandong University), Jinan, People’s Republic of China
- Center for Health Preference Research, Shandong University, Jinan, People’s Republic of China
| | - Zhuxin Mao
- School of Insurance, Southwestern University of Finance and Economics, Chengdu, People’s Republic of China
| | - Qiang Fu
- Department of Cardiovascular Surgery, General Hospital of Tianjin Medical University, Tianjin, People’s Republic of China
| | - Gang Chen
- Center for Health Economics, Monash Business School, Monash University, Melbourne, VIC, Australia
| | - Shunping Li
- Center for Health Management and Policy Research, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, People’s Republic of China
- NHC Key Laboratory of Health Economics and Policy Research (Shandong University), Jinan, People’s Republic of China
- Center for Health Preference Research, Shandong University, Jinan, People’s Republic of China
- Correspondence: Shunping Li, Center for Health Management and Policy Research, School of Public Health, Shandong University, Wenhua Xi Road 44, Jinan, Shandong Province, 250012, People’s Republic of China, Tel +86-131-8893-4998, Email
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17
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Ni X, Tian J, Chen C, Huang L, Lei J, Yu X, Wang X. Multiple exposures to high concentrations of selenate significantly improve selenate tolerability, red elemental selenium (Se 0) and selenoprotein biosynthesis in Herbaspirillum camelliae WT00C. World J Microbiol Biotechnol 2021; 38:5. [PMID: 34837115 DOI: 10.1007/s11274-021-03190-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 11/16/2021] [Indexed: 10/19/2022]
Abstract
Herbaspirillum camelliae WT00C is a gram-negative endophyte isolated from the tea plant. It has an intact selenate metabolism pathway but poor selenate tolerability. In this study, microbiological properties of the strain WT00C were examined and compared with other three strains CT00C, NCT00C and NT00C, which were obtained respectively from four, six and eight rounds of 24-h exposures to 200 mM selenate. The selenate tolerability and the ability to generate red elemental selenium (Se0) and selenoproteins in H. camelliae WT00C has significantly improved by the forced evolution via 4-6 rounds of multiple exposures a high concentration of selenate. The original strain WT00C grew in 200 mM selenate with the lag phase of 12 h and 400 mM selenate with the lag phase of 60 h, whereas the strains CT00C and NCT00C grew in 800 mM selenate and showed a relatively short lag phase when they grew in 50-400 mM selenate. Besides selenate tolerance, the strains CT00C and NCT00C significantly improved the biosynthesis of red elemental selenium (Se0) and selenoproteins. Two strains exhibited more than 30% selenium conversion efficiency and 40% selenoprotein biosynthesis, compared to the original strain WT00C. These characteristics of the strains CT00C and NCT00C make them applicable in pharmaceuticals and feed industries. The strain NT00C obtained from eight rounds of 24-h exposures to 200 mM selenate was unable to grow in ≥ 400 mM selenate. Its selenium conversion efficiency and selenoprotein biosynthesis were similar to the strain WT00C, indicating that too many exposures may cause gene inactivation of some critical enzymes involving selenate metabolism and antioxidative stress. In addition, bacterial cells underwent obviously physiological and morphological changes, including gene activity, cell enlargement and surface-roughness alterations during the process of multiple exposures to high concentrations of selenate.
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Affiliation(s)
- Xuechen Ni
- State Key Laboratory of Biocatalysis and Enzyme Engineering, The Faculty of Life Science, Hubei University, Wuhan, China
| | - Jinbao Tian
- State Key Laboratory of Biocatalysis and Enzyme Engineering, The Faculty of Life Science, Hubei University, Wuhan, China
| | - Changmei Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, The Faculty of Life Science, Hubei University, Wuhan, China
| | - Ling Huang
- Obstetrics and Gynecology Department, Fifth Hospital in Wuhan, Wuhan, China
| | - Jia Lei
- State Key Laboratory of Biocatalysis and Enzyme Engineering, The Faculty of Life Science, Hubei University, Wuhan, China
| | - Xuejing Yu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, The Faculty of Life Science, Hubei University, Wuhan, China
| | - Xingguo Wang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, The Faculty of Life Science, Hubei University, Wuhan, China.
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18
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The periodic table of photosynthetic purple non-sulfur bacteria: intact cell-metal ions interactions. Photochem Photobiol Sci 2021; 21:101-111. [PMID: 34748197 DOI: 10.1007/s43630-021-00116-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 10/12/2021] [Indexed: 10/19/2022]
Abstract
Photosynthetic purple non-sulfur bacteria (PNB) have been widely utilized as model organisms to study bacterial photosynthesis. More recently, the remarkable resistance of these microorganisms to several metals ions called particular interest. As a result, several research efforts were directed toward clarifying the interactions of metal ions with PNB. The mechanisms of metal ions active uptake and bioabsorption have been studied in detail, unveiling that PNB enable harvesting and removing various toxic ions, thus fostering applications in environmental remediation. Herein, we present the most important achievements in the understanding of intact cell-metal ions interactions and the approaches utilized to study such processes. Following, the application of PNB-metal ions interactions toward metal removal from contaminated environments is presented. Finally, the possible coupling of PNB with abiotic electrodes to obtain biohybrid electrochemical systems is proposed as a sustainable pathway to tune and enhance metal removal and monitoring.
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19
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Filip J, Vinter Š, Čechová E, Sotolářová J. Materials interacting with inorganic selenium from the perspective of electrochemical sensing. Analyst 2021; 146:6394-6415. [PMID: 34596173 DOI: 10.1039/d1an00677k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Inorganic selenium, the most common form of harmful selenium in the environment, can be determined using electrochemical sensors, which are compact, fast, reliable and easy-to-operate devices. Despite progress in this area, there is still significant room for developing high-performance selenium electrochemical sensors. To achieve this, one should take into account (i) the electrochemical process that selenium undergoes on the electrode; (ii) the valence state of selenium species in the sample and (iii) modification of the sensor surface by a material with high affinity to selenium. The goal of this review is to provide a knowledge base for these issues. After the Introduction section, mechanisms and principles of the electrochemical reduction of selenium are introduced, followed by a section introducing the modification of electrodes with materials interacting with selenium and a section dedicated to speciation methods, including the reduction of non-detectable Se(VI) to detectable Se(IV). In the following sections, the main types of materials (metallic, polymers, hybrid (nano)materials…) interacting with inorganic selenium (mostly absorbents) are reviewed to show the diversity of properties that may be endowed to sensors if the materials were to be used for the modification of electrodes. These features for the main material categories are outlined in the conclusion section, where it is stated that the engineered polymers may be the most promising modifiers.
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Affiliation(s)
- Jaroslav Filip
- Department of Environmental Protection Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nad Ovčírnou 3685, Zlín 760 01, Czechia.
| | - Štěpán Vinter
- Department of Environmental Protection Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nad Ovčírnou 3685, Zlín 760 01, Czechia.
| | - Erika Čechová
- Department of Environmental Protection Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nad Ovčírnou 3685, Zlín 760 01, Czechia.
| | - Jitka Sotolářová
- Department of Environmental Protection Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nad Ovčírnou 3685, Zlín 760 01, Czechia.
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20
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Zhou C, Wang ZJ, Huang JC, Zheng L, Gan X, Zhang M, He S, Zhou W. Se transformation and removal by a cattail litter treatment system inoculated with sulfur-based denitrification sludge: Role of the microbial community composition under various temperature and aeration conditions. JOURNAL OF HAZARDOUS MATERIALS 2021; 420:126617. [PMID: 34271446 DOI: 10.1016/j.jhazmat.2021.126617] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 06/17/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
With a narrow margin between deficiency and toxicity, rising levels of selenium (Se) are threatening aquatic ecosystems. To investigate the role of microorganisms in Se bioremediation, a cattail litter system inoculated with the sulfur-based denitrification sludge was conducted. The results show the litter, as a carrier and nutrient source for bacteria, efficiently removed Se by ~ 97.0% during a 12-d treatment with water circulating. As the major removal pathways, immobilization rates of selenite were ~ 2.9-fold higher than selenate, and the volatilization, contributing to ~ 87.7% of the total Se removal, was significantly correlated with temperature (positively) and oxidation-reduction potential (ORP; negatively). Using X-ray absorption spectroscopy to speciate litter-borne Se, more Se0 formed without aeration due to abundant Se-reducing bacteria, among which Azospira and Azospirillum were highly related to the removal of both Se oxyanions, while Desulfovibrio, Azoarcus, Sulfurospirillum, Thauera, Geobacter, Clostridium, and Pediococcus were the major contributors to selenate removal. Overall, our study suggests microbial Se metabolism in the litter system was significantly affected by temperature and ORP, which could be manipulated to enhance Se removal efficiency and the transformation of selenate/selenite into low toxic Se0 and volatile Se, reducing risks posed by the residual Se in the system.
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Affiliation(s)
- Chuanqi Zhou
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zi-Jing Wang
- Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan, ROC
| | - Jung-Chen Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan, ROC.
| | - Lixin Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Xinyu Gan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Manping Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Shengbing He
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Weili Zhou
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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21
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Alvares JJ, Furtado IJ. Conversion of selenite by Haloferax alexandrinus GUSF-1 (KF796625) to pentagonal selenium nanoforms which in vitro modulates the formation of calcium oxalate crystals. J Appl Microbiol 2021; 132:1900-1913. [PMID: 34586705 DOI: 10.1111/jam.15309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 06/28/2021] [Accepted: 09/22/2021] [Indexed: 11/30/2022]
Abstract
AIM To investigate the ability of Haloferax alexandrinus GUSF-1 (KF796625) to biosynthesize non-toxic elemental selenium (Se0 ) and check their capacity in in vitro crystal structure modulation of calcium oxalate, which are implicated in the development of renal calculi. METHODS AND RESULTS Haloferax alexandrinus GUSF-1 (KF796625) during growth in the presence of 5 mmol L-1 of selenite formed insoluble brick-red particles. Se0 formed was monitored spectrophotometrically using a combination of two assays; the ascorbic acid reduction and sodium sulphide solubilization assay. After 168 h of growth, 2.89 mmol L-1 of Se0 was formed from 4.9 mmol L-1 of selenite. Absorption bands at 1.5, 11.2 and 12.5 keV in EDX spectroscopy confirmed that the brick-red particulate matter was Se0 . Furthermore, these selenium nanoparticles (SeNPs) were pentagonal in shape in transmission electron microscopy imaging. The peak positions in X-ray diffractogram at 2θ values of 23.40°, 29.66°, 41.26°, 43.68°, 45.24°, 51.62°, 55.93° and 61.47° and the relative intensities further confirmed the formation of Se0 . In vitro addition of 50 and 100 µg ml-1 of these SeNPs to the mixture of sodium chloride, calcium chloride and sodium oxalate affected and modulated the shape and size of rectangular-shaped calcium oxalate crystals (average area of 1.23 ± 0.2 µm2 ) to smaller rectangular-shaped crystals (average area of 0.54 ± 0.2 µm2 ) and spherical-shaped crystals (average area 0.13 ± 0.005 µm2 ). CONCLUSION Haloferax alexandrinus GUSF-1 (KF796625) transformed selenite to Se0 pentagonal nanoforms that modulated in vitro the formation of crystal shape and size of calcium oxalate. SIGNIFICANCE AND IMPACT OF STUDY There are no reports on conversion of selenite to Se0 among the Haloferax genera, and this study involving the formation of pentagonal SeNPs with capacity to modulate the formation of calcium oxalate crystals in haloarchaea is recorded as the first report and of significance in pharmaceutical research related to formulations abetting urinary calculi.
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Adnan F, Jalil A, Ahmed T, Rahman A, Dawood N, Haider G, Siddiqui MF, Rostock L, Guenther S, Schaufler K. TRAP transporter TakP: a key player in the resistance against selenite-induced oxidative stress in Rhodobacter sphaeroides. Microbiol Res 2021; 252:126828. [PMID: 34543948 DOI: 10.1016/j.micres.2021.126828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 03/28/2021] [Accepted: 07/20/2021] [Indexed: 11/24/2022]
Abstract
Almost one-third of all proteins require metal ions as an essential component in key biological processes and approximately half of all enzymes are associated with one or more metal ions. The naturally occurring selenium is very toxic at higher levels, but few bacteria can reduce it into the less toxic insoluble elemental selenium. Selenium is required for the synthesis of selenocysteine, an essential residue involved in the active sites of various enzymes. The purple non-sulphur bacteria, Rhodobacter sphaeroidesis demonstrated for its selenite reduction capacity. The exact mechanism of selenite toxicity is unknown but it reacts with glutathione to form selenodiglutathione, producing the highly toxic compounds namely, H2O2and O2-. A R. sphaeroidesstrain with mutated takP gene, a member of the TRAP (tripartite ATP-independent periplasmic) family of transporter, was reported to be showing more resistance towards selenite in the growth medium but the reason for the resistance is unknown. TRAP transporters are the best-studied family of substrate-binding protein and in our previous study it was confirmed that the gene takP in R. sphaeroides is down-regulated by a small non-coding RNA SorY, providing more resistance to the bacterium against the oxidative stress. By comparative growth analysis and sensitivity assays in the presence of 2 mM selenite, it was observed that the SorY knockout strain is more sensitive to selenite while overexpression of the sRNA conferred more resistance to the bacterium like the takP mutant strain. TakP is involved in the import of malate into the cell, which under oxidative stress needs to be down-regulated to limit malate flux into the cell. Limited malate flux leads to metabolic rearrangements in the cell to avoid excessive generation of prooxidant NADH and facilitate constant generation of antioxidant NADPH. In the presence and absence of selenite, a drastic increase in the NADPH and decrease in the NADH levels are reported respectively. Accumulation of metallic selenium in the cytoplasm was detected via atomic absorption spectrophotometer and our analysis clearly demonstrated the presence of more selenium in the electron micrographs of the SorY knockout strain compared to the takP mutant grown under dark semi-aerobic growth conditions in the presence of selenite. Hence based on our analysis, it is confirmed that lack of TakP transporter led to reduced selenite influx into the cytoplasm, relieving cells with limited generation of ROS, eventually exhibiting more resistance against selenite-induced oxidative stress.
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Affiliation(s)
- Fazal Adnan
- Atta ur Rahman School of Applied Biosciences (ASAB), National University of Sciences & Technology (NUST), Islamabad, Pakistan.
| | - Amna Jalil
- Atta ur Rahman School of Applied Biosciences (ASAB), National University of Sciences & Technology (NUST), Islamabad, Pakistan.
| | - Tahir Ahmed
- Atta ur Rahman School of Applied Biosciences (ASAB), National University of Sciences & Technology (NUST), Islamabad, Pakistan.
| | - Afra Rahman
- Atta ur Rahman School of Applied Biosciences (ASAB), National University of Sciences & Technology (NUST), Islamabad, Pakistan.
| | - Nawal Dawood
- Atta ur Rahman School of Applied Biosciences (ASAB), National University of Sciences & Technology (NUST), Islamabad, Pakistan.
| | - Ghulam Haider
- Atta ur Rahman School of Applied Biosciences (ASAB), National University of Sciences & Technology (NUST), Islamabad, Pakistan.
| | | | - Leon Rostock
- Institute of Pharmacy, Pharmaceutical Biology, University of Greifswald, Germany.
| | - Sebastian Guenther
- Institute of Pharmacy, Pharmaceutical Biology, University of Greifswald, Germany.
| | - Katharina Schaufler
- Institute of Pharmacy, Pharmaceutical Microbiology, University of Greifswald, Germany; Institute of infection medicine, Kiel University, Germany.
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Ullah A, Yin X, Wang F, Xu B, Mirani ZA, Xu B, Chan MWH, Ali A, Usman M, Ali N, Naveed M. Biosynthesis of Selenium Nanoparticles (via Bacillus subtilis BSN313), and Their Isolation, Characterization, and Bioactivities. Molecules 2021; 26:5559. [PMID: 34577029 PMCID: PMC8468162 DOI: 10.3390/molecules26185559] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/06/2021] [Accepted: 09/08/2021] [Indexed: 11/17/2022] Open
Abstract
Among the trace elements, selenium (Se) has great demand as a health supplement. Compared to its other forms, selenium nanoparticles have minor toxicity, superior reactivity, and excellent bioavailability. The present study was conducted to produce selenium nanoparticles (SeNPs) via a biosynthetic approach using probiotic Bacillus subtilis BSN313 in an economical and easy manner. The BSN313 exhibited a gradual increase in Se reduction and production of SeNPs up to 5-200 µg/mL of its environmental Se. However, the capability was decreased beyond that concentration. The capacity for extracellular SeNP production was evidenced by the emergence of red color, then confirmed by a microscopic approach. Produced SeNPs were purified, freeze-dried, and subsequently characterized systematically using UV-Vis spectroscopy, FTIR, Zetasizer, SEM-EDS, and TEM techniques. SEM-EDS analysis proved the presence of selenium as the foremost constituent of SeNPs. With an average particle size of 530 nm, SeNPs were shown to have a -26.9 (mV) zeta potential and -2.11 µm cm/Vs electrophoretic mobility in water. SeNPs produced during both the 24 and 48 h incubation periods showed good antioxidant activity in terms of DPPH and ABST scavenging action at a concentration of 150 µg/mL with no significant differences (p > 0.05). Moreover, 200 µg/mL of SeNPs showed antibacterial reactivity against Escherichia coli ATCC 8739, Staphylococcus aureus ATCC 9027, and Pseudomonas aeruginosa ATCC 25923. In the future, this work will be helpful to produce biogenic SeNPs using probiotic Bacillus subtilis BSN313 as biofactories, with the potential for safe use in biomedical and nutritional applications.
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Affiliation(s)
- Asad Ullah
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing 100048, China; (A.U.); (X.Y.); (B.X.); (M.U.); (N.A.); (M.N.)
- School of Light Industry, Beijing Technology & Business University (BTBU), Beijing 100048, China
- Food and Marine Resources Research Center, Pakistan Council of Scientific and Industrial Research Laboratories Complex, Karachi 75280, Pakistan;
| | - Xian Yin
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing 100048, China; (A.U.); (X.Y.); (B.X.); (M.U.); (N.A.); (M.N.)
- School of Light Industry, Beijing Technology & Business University (BTBU), Beijing 100048, China
| | - Fenghuan Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing 100048, China; (A.U.); (X.Y.); (B.X.); (M.U.); (N.A.); (M.N.)
- School of Light Industry, Beijing Technology & Business University (BTBU), Beijing 100048, China
| | - Bo Xu
- McIntire School of Commerce, University of Virginia, Charlottesville, VA 22903, USA
| | - Zulfiqar Ali Mirani
- Food and Marine Resources Research Center, Pakistan Council of Scientific and Industrial Research Laboratories Complex, Karachi 75280, Pakistan;
| | - Baocai Xu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing 100048, China; (A.U.); (X.Y.); (B.X.); (M.U.); (N.A.); (M.N.)
- School of Light Industry, Beijing Technology & Business University (BTBU), Beijing 100048, China
| | - Malik Wajid Hussain Chan
- Centre of Excellence in Marine Biology, University of Karachi, Karachi 75270, Pakistan; (M.W.H.C.); (A.A.)
| | - Amjad Ali
- Centre of Excellence in Marine Biology, University of Karachi, Karachi 75270, Pakistan; (M.W.H.C.); (A.A.)
| | - Muhammad Usman
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing 100048, China; (A.U.); (X.Y.); (B.X.); (M.U.); (N.A.); (M.N.)
| | - Nawazish Ali
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing 100048, China; (A.U.); (X.Y.); (B.X.); (M.U.); (N.A.); (M.N.)
- School of Light Industry, Beijing Technology & Business University (BTBU), Beijing 100048, China
| | - Muhammad Naveed
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing 100048, China; (A.U.); (X.Y.); (B.X.); (M.U.); (N.A.); (M.N.)
- School of Light Industry, Beijing Technology & Business University (BTBU), Beijing 100048, China
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Abstract
Selenium nanoparticles (SeNPs) are gaining importance in the food and medical fields due to their antibacterial properties. The microbial inhibition of these kinds of particles has been tested in a wide range of Gram (+) and Gram (−) pathogenic bacteria. When SeNPs are synthesized by biological methods, they are called biogenic SeNPs, which have a negative charge caused by their interaction between surface and capping layer (bioorganic material), producing their high stability. This review is focused on SeNPs synthesis by bacteria and summarizes the main factors that influence their main characteristics: shape, size and surface charge, considering the bacteria growth conditions for their synthesis. The different mechanisms of antimicrobial activity are revised, and this review describes several biosynthesis hypotheses that have been proposed due to the fact that the biological mechanism of SeNP synthesis is not fully known.
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25
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Li PS, Kong WL, Wu XQ. Salt Tolerance Mechanism of the Rhizosphere Bacterium JZ-GX1 and Its Effects on Tomato Seed Germination and Seedling Growth. Front Microbiol 2021; 12:657238. [PMID: 34168626 PMCID: PMC8217874 DOI: 10.3389/fmicb.2021.657238] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 05/03/2021] [Indexed: 12/18/2022] Open
Abstract
Salinity is one of the strongest abiotic factors in nature and has harmful effects on plants and microorganisms. In recent years, the degree of soil salinization has become an increasingly serious problem, and the use of plant growth-promoting rhizobacteria has become an option to improve the stress resistance of plants. In the present study, the salt tolerance mechanism of the rhizosphere bacterium Rahnella aquatilis JZ-GX1 was investigated through scanning electron microscopy observations and analysis of growth characteristics, compatible solutes, ion distribution and gene expression. In addition, the effect of JZ-GX1 on plant germination and seedling growth was preliminarily assessed through germination experiments. R. aquatilis JZ-GX1 was tolerant to 0-9% NaCl and grew well at 3%. Strain JZ-GX1 promotes salt tolerance by stimulating the production of exopolysaccharides, and can secrete 60.6983 mg/L of exopolysaccharides under the high salt concentration of 9%. Furthermore, the accumulation of the compatible solute trehalose in cells as the NaCl concentration increased was shown to be the primary mechanism of resistance to high salt concentrations in JZ-GX1. Strain JZ-GX1 could still produce indole-3-acetic acid (IAA) and siderophores and dissolve inorganic phosphorus under salt stress, characteristics that promote the ability of plants to resist salt stress. When the salt concentration was 100 mmol/L, strain JZ-GX1 significantly improved the germination rate, germination potential, fresh weight, primary root length and stem length of tomato seeds by 10.52, 125.56, 50.00, 218.18, and 144.64%, respectively. Therefore, R. aquatilis JZ-GX1 is a moderately halophilic bacterium with good growth-promoting function that has potential for future development as a microbial agent and use in saline-alkali land resources.
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Affiliation(s)
- Pu-Sheng Li
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, China.,Jiangsu Key Laboratory for Prevention and Management of Invasive Species, Nanjing Forestry University, Nanjing, China
| | - Wei-Liang Kong
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, China.,Jiangsu Key Laboratory for Prevention and Management of Invasive Species, Nanjing Forestry University, Nanjing, China
| | - Xiao-Qin Wu
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, China.,Jiangsu Key Laboratory for Prevention and Management of Invasive Species, Nanjing Forestry University, Nanjing, China
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26
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Kazemi M, Akbari A, Zarrinfar H, Soleimanpour S, Sabouri Z, Khatami M, Darroudi M. Evaluation of Antifungal and Photocatalytic Activities of Gelatin-Stabilized Selenium Oxide Nanoparticles. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01462-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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27
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Chen C, Tian J, Zhou J, Ni X, Lei J, Wang X. Bacterial growth, morphology, and cell component changes in Herbaspirillum
sp. WT00C exposed to high concentration of selenate. J Basic Microbiol 2020; 60:304-321. [DOI: 10.1002/jobm.201900586] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 11/29/2019] [Accepted: 12/08/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Changmei Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Faculty of Life Science; Hubei University; Wuhan China
| | - Jinbao Tian
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Faculty of Life Science; Hubei University; Wuhan China
| | - Jiahui Zhou
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Faculty of Life Science; Hubei University; Wuhan China
| | - Xuechen Ni
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Faculty of Life Science; Hubei University; Wuhan China
| | - Jia Lei
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Faculty of Life Science; Hubei University; Wuhan China
| | - Xingguo Wang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Faculty of Life Science; Hubei University; Wuhan China
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28
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Xu X, Cheng W, Liu X, You H, Wu G, Ding K, Tu X, Yang L, Wang Y, Li Y, Gu H, Wang X. Selenate Reduction and Selenium Enrichment of Tea by the Endophytic Herbaspirillum sp. Strain WT00C. Curr Microbiol 2019; 77:588-601. [PMID: 30963199 PMCID: PMC7075828 DOI: 10.1007/s00284-019-01682-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 04/01/2019] [Indexed: 11/30/2022]
Abstract
Herbaspirillum sp. WT00C is a tea-plant-specific endophytic bacterium. A genomic survey revealed an intact pathway for selenocompound metabolism in the genome of this bacterium. When it was cultured with sodium selenate, Herbaspirillum sp. WT00C was able to turn the culture medium to red. Electron microscopy and energy-dispersive X-ray spectroscopy confirmed that Herbaspirillum sp. WT00C reduced selenite (Se6+) to elemental selenium (Se0), and selenium nanoparticles (SeNPs) were secreted outside bacterial cells and grew increasingly larger to form Se-nanospheres and finally crystallized to form selenoflowers. Biochemical assays showed that selenospheres contained proteins but not carbohydrates or lipids. The improvement of selenium enrichment of tea plants by Herbaspirillum sp. WT00C was also tested. After Herbaspirillum sp. WT00C was inoculated into tea seedlings via needle injection and soaking tea-cutting methods, this endophytic bacterium markedly enhanced selenium enrichment of tea. When the tea seedlings inoculated by soaking tea-cutting mode were cultivated in the selenium-containing soils, selenium contents of tea leaves in three experimental groups were more than twofold compared to those of control groups. Our study demonstrates that the endophytic bacterium Herbaspirillum sp. WT00C has the ability to reduce selenate and improve selenium enrichment of tea.
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Affiliation(s)
- Xiao Xu
- The Faculty of Life Science, Hubei University, Wuhan, China
| | - Wei Cheng
- The Faculty of Life Science, Hubei University, Wuhan, China
| | - Xin Liu
- The Faculty of Life Science, Hubei University, Wuhan, China
| | - Heng You
- The Faculty of Life Science, Hubei University, Wuhan, China
| | - Guitai Wu
- The Faculty of Physics and Electronic Sciences, Hubei University, Wuhan, China
| | - Kunming Ding
- Xianning Academy of Agricultural Science, Xianning, Hubei, China
| | - Xiuliang Tu
- Xianning Academy of Agricultural Science, Xianning, Hubei, China
| | - Lanfang Yang
- The Faculty of Resource and Environmental Science, Hubei University, Wuhan, China
| | - Youpin Wang
- Hubei Academy of Agricultural Science, Wuhan, China
| | - Yadong Li
- The Faculty of Life Science, Hubei University, Wuhan, China
| | - Haoshuang Gu
- The Faculty of Physics and Electronic Sciences, Hubei University, Wuhan, China
| | - Xingguo Wang
- The Faculty of Life Science, Hubei University, Wuhan, China.
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29
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Wadgaonkar SL, Nancharaiah YV, Jacob C, Esposito G, Lens PNL. Microbial transformation of Se oxyanions in cultures of Delftia lacustris grown under aerobic conditions. J Microbiol 2019; 57:362-371. [PMID: 30900147 DOI: 10.1007/s12275-019-8427-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 11/20/2018] [Accepted: 11/26/2018] [Indexed: 12/29/2022]
Abstract
Delftia lacustris is reported for the first time as a selenate and selenite reducing bacterium, capable of tolerating and growing in the presence of ≥ 100 mM selenate and 25 mM selenite. The selenate reduction profiles of D. lacustris were investigated by varying selenate concentration, inoculum size, concentration and source of organic electron donor in minimal salt medium. Interestingly, the bacterium was able to reduce both selenate and selenite under aerobic conditions. Although considerable removal of selenate was observed at all concentrations investigated, D. lacustris was able to completely reduce 0.1 mM selenate within 96 h using lactate as the carbon source. Around 62.2% unaccounted selenium (unidentified organo-selenium compounds), 10.9% elemental selenium and 26.9% selenite were determined in the medium after complete reduction of selenate. Studies of the enzymatic activity of the cell fractions show that the selenite/selenate reducing enzymes were intracellular and independent of NADPH availability. D. lacustris shows an unique metabolism of selenium oxyanions to form elemental selenium and possibly also selenium ester compounds, thus a potential candidate for the remediation of selenium-contaminated wastewaters in aerobic environments. This novel finding will advance the field of bioremediation of selenium-contaminated sites and selenium bio-recovery and the production of potentially beneficial organic and inorganic reactive selenium species.
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Affiliation(s)
| | - Yarlagadda V Nancharaiah
- Biofouling and Biofilm Processes Section of Water and Steam Chemistry Division, Bhabha Atomic Research Centre, 603 102, Kalpakkam, Tamil Nadu, India
- Homi Bhabha National Institute, Anushakti Nagar Complex, Mumbai, 400 094, India
| | - Claus Jacob
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, Campus B2, Saarland, Germany
| | - Giovanni Esposito
- Department of Civil, Architectural and Environmental Engineering, University of Napoli "Federico II", 80125, Napoli, Italy
| | - Piet N L Lens
- UNESCO IHE Institute for water Education, Delft, DA 2601, The Netherlands
- National University of Ireland Galway, Galway, H91 TK33, Ireland
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30
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Detoxification and reduction of selenite to elemental red selenium by Frankia. Antonie van Leeuwenhoek 2018; 112:127-139. [DOI: 10.1007/s10482-018-1196-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 11/02/2018] [Indexed: 12/25/2022]
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31
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Maltman C, Yurkov V. Bioremediation potential of bacteria able to reduce high levels of selenium and tellurium oxyanions. Arch Microbiol 2018; 200:1411-1417. [DOI: 10.1007/s00203-018-1555-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 07/11/2018] [Accepted: 07/17/2018] [Indexed: 11/24/2022]
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32
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Kora AJ. Bacillus cereus, selenite-reducing bacterium from contaminated lake of an industrial area: a renewable nanofactory for the synthesis of selenium nanoparticles. BIORESOUR BIOPROCESS 2018. [DOI: 10.1186/s40643-018-0217-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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33
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Biosynthesis of selenium nanoparticles and effects of selenite, selenate, and selenomethionine on cell growth and morphology in Rahnella aquatilis HX2. Appl Microbiol Biotechnol 2018; 102:6191-6205. [PMID: 29806064 DOI: 10.1007/s00253-018-9060-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 04/23/2018] [Accepted: 04/27/2018] [Indexed: 01/13/2023]
Abstract
Rahnella aquatilis HX2 (proteobacteria) shows tolerance to selenium (Se). The minimum inhibitory concentrations of selenomethionine (Se-Met), selenite [Se (IV)], and selenate [Se (VI)] to HX2 are 4.0, 85.0, and 590.0 mM, respectively. HX2 shows the ability to reduce Se (IV) and Se (VI) to elemental Se nanoparticles (SeNPs). The maximum production of SeNPs by HX2 strain is 1.99 and 3.85 mM in Luria-Bertani (LB) broth with 5 mM Se (IV) and 10 mM Se (VI), respectively. The morphology of SeNPs and cells were observed by transmission electron microscope, environmental scanning electron microscope, and selected area electric diffraction detector. Spherical SeNPs with amorphous structure were found in the cytoplasm, membrane, and exterior of cells. Morphological variations of the cell membrane were further confirmed by the release of cellular materials absorbed at 260 nm. Flagella were inhibited and cell sizes were 1.8-, 1.6-, and 1.2-fold increases with the Se-Met, Se (VI), and Se (IV) treatments, respectively. The real-time quantitative PCR analysis indicated that some of the genes controlling Se metabolism or cell morphology, including cysA, cysP, rodA, ZntA, and ada, were significantly upregulated, while grxA, fliO, flgE, and fliC genes were significantly downregulated in those Se treatments. This study provided novel valuable information concerning the cell morphology along with biological synthesis process of SeNPs in R. aquatilis and demonstrated that the strain HX2 could be applied in both biosynthesis of SeNPs and in management of environmental Se pollution.
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Hosnedlova B, Kepinska M, Skalickova S, Fernandez C, Ruttkay-Nedecky B, Peng Q, Baron M, Melcova M, Opatrilova R, Zidkova J, Bjørklund G, Sochor J, Kizek R. Nano-selenium and its nanomedicine applications: a critical review. Int J Nanomedicine 2018; 13:2107-2128. [PMID: 29692609 PMCID: PMC5901133 DOI: 10.2147/ijn.s157541] [Citation(s) in RCA: 299] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Traditional supplements of selenium generally have a low degree of absorption and increased toxicity. Therefore, it is imperative to develop innovative systems as transporters of selenium compounds, which would raise the bioavailability of this element and allow its controlled release in the organism. Nanoscale selenium has attracted a great interest as a food additive especially in individuals with selenium deficiency, but also as a therapeutic agent without significant side effects in medicine. This review is focused on the incorporation of nanotechnological applications, in particular exploring the possibilities of a more effective way of administration, especially in selenium-deficient organisms. In addition, this review summarizes the survey of knowledge on selenium nanoparticles, their biological effects in the organism, advantages, absorption mechanisms, and nanotechnological applications for peroral administration.
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Affiliation(s)
- Bozena Hosnedlova
- Department of Viticulture and Enology, Faculty of Horticulture, Mendel University in Brno, Lednice, Czech Republic
| | - Marta Kepinska
- Department of Biomedical and Environmental Analyses, Faculty of Pharmacy, Wroclaw Medical University, Wroclaw, Poland
| | - Sylvie Skalickova
- Central Laboratory, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Carlos Fernandez
- School of Pharmacy and Life Sciences, Robert Gordon University, Aberdeen, UK
| | - Branislav Ruttkay-Nedecky
- Central Laboratory, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Qiuming Peng
- State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, People's Republic of China
| | - Mojmir Baron
- Department of Viticulture and Enology, Faculty of Horticulture, Mendel University in Brno, Lednice, Czech Republic
| | - Magdalena Melcova
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - Radka Opatrilova
- Central Laboratory, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Jarmila Zidkova
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - Geir Bjørklund
- Council for Nutritional and Environmental Medicine, Rana, Norway
| | - Jiri Sochor
- Department of Viticulture and Enology, Faculty of Horticulture, Mendel University in Brno, Lednice, Czech Republic
| | - Rene Kizek
- Department of Biomedical and Environmental Analyses, Faculty of Pharmacy, Wroclaw Medical University, Wroclaw, Poland.,Central Laboratory, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
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35
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Komova AV, Aliev RO, Mel’nikova AA, Kamyshinskii RA, Presnyakov MY, Kal’sin AM, Namsaraev ZB. Fabrication and Characterization of Biogenic Selenium Nanoparticles. CRYSTALLOGR REP+ 2018. [DOI: 10.1134/s1063774518020098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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36
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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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37
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Abstract
Elemental selenium nanoparticles (SeNPs) have multiple biological activities. In this study, we investigated the protective effects of biogenic SeNPs (BioSeNPs) on CCl4-induced liver damage in mice. The results showed that: (i) when compared to sodium selenite (SS), BioSeNPs has a similar tissue distribution after intragastrical administration to mice; (ii) BioSeNPs and SS showed comparable efficacy in increasing the activities of glutathione peroxidase and thioredoxin reductase in liver cell lines, mice blood and liver; (iii) pretreatment with BioSeNPs inhibiting the elevation of activities of various enzymes significantly which included aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, lactate dehydrogenase and liver lipid peroxide (p < 0.05 or p < 0.01) in CCl4-treated mice; (iv) activities of antioxidant enzymes (superoxide dismutase, catalase, and glutathione peroxidase) were significantly increased (p < 0.05 or p < 0.01) after a pretreatment with BioSeNPs in CCl4-treated mice; (v) histopathological damages in the liver from CCl4-treated mice were ameliorated by a pretreatment with BioSeNPs. In conclusion, these results have shown that BioSeNPs is able to protect the liver from CCl4-induced hepatic damage via increasing the antioxidant capacity and inhibiting oxidative damage. BioSeNPs may have the potential to be used as a trace element food supplement inducing antioxidant bioactivities.
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38
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Kora AJ, Rastogi L. Bacteriogenic synthesis of selenium nanoparticles by Escherichia coli ATCC 35218 and its structural characterisation. IET Nanobiotechnol 2017; 11:179-184. [PMID: 28477001 PMCID: PMC8676288 DOI: 10.1049/iet-nbt.2016.0011] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 04/13/2016] [Accepted: 04/29/2016] [Indexed: 07/29/2023] Open
Abstract
A biosynthetic method for the production of selenium nanoparticles under ambient temperature and pressure from sodium selenite was developed using Gram-negative bacterial strain Escherichia coli ATCC 35218. Bacteriogenic nanoparticles were methodologically characterized employing UV-vis, XRD, Raman spectroscopy, SEM, TEM, DLS and FTIR techniques. Generation of nanoparticles was visualized from the appearance of red colour in the selenite supplemented culture medium and broad absorption bands in the UV-vis. Biofabricated nanoparticles were spherical, polydisperse, ranged from 100-183 nm and the average particle size was about 155 nm. Based on selected-area electron diffraction, XRD patterns; and Raman spectroscopy the nanospheres were found to be amorphous. IR spectrum revealed the involvement of bacterial proteins in the reduction of selenite and stabilization of nanoparticles. Used bacterial strain demonstrated efficient selenite reduction capability which was evident from 89.2% of selenium removal within 72 h at a concentration of 1 mM. Observation noted in the current study highlight the importance of bacterial reduction in selenium nanoparticle generation which can be scaled up for commercial production. Also, the bacteriogenic, amorphous nanoparticles can also be used as nutritional supplements for humans since selenium nanoparticles of 5-200 nm are bioavailable and known to induce seleno enzymes involved in antioxidant defence.
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Affiliation(s)
- Aruna Jyothi Kora
- National Centre for Compositional Characterisation of Materials (NCCCM), Bhabha Atomic Research Centre (BARC), ECIL PO, Hyderabad 500 062, India.
| | - Lori Rastogi
- National Centre for Compositional Characterisation of Materials (NCCCM), Bhabha Atomic Research Centre (BARC), ECIL PO, Hyderabad 500 062, India
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39
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Lampis S, Zonaro E, Bertolini C, Cecconi D, Monti F, Micaroni M, Turner RJ, Butler CS, Vallini G. Selenite biotransformation and detoxification by Stenotrophomonas maltophilia SeITE02: Novel clues on the route to bacterial biogenesis of selenium nanoparticles. JOURNAL OF HAZARDOUS MATERIALS 2017; 324:3-14. [PMID: 26952084 DOI: 10.1016/j.jhazmat.2016.02.035] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 02/06/2016] [Accepted: 02/14/2016] [Indexed: 05/02/2023]
Abstract
A putative biosynthetic mechanism for selenium nanoparticles (SeNPs) and efficient reduction of selenite (SeO32-) in the bacterial strain Stenotrophomonas maltophilia SeITE02 are addressed here on the basis of information gained by a combined approach relying on a set of physiological, chemical/biochemical, microscopy, and proteomic analyses. S. maltophilia SeITE02 is demonstrated to efficiently transform selenite into elemental selenium (Se°) by reducing 100% of 0.5mM of this toxic oxyanion to Se° nanoparticles within 48h growth, in liquid medium. Since the selenite reducing activity was detected in the cytoplasmic protein fraction, while biogenic SeNPs showed mainly extracellular localization, a releasing mechanism of SeNPs from the intracellular environment is hypothesized. SeNPs appeared spherical in shape and with size ranging from 160nm to 250nm, depending on the age of the cultures. Proteomic analysis carried out on the cytoplasmic fraction identified an alcohol dehydrogenase homolog, conceivably correlated with the biogenesis of SeNPs. Finally, by Fourier Transformed Infrared Spectrometry, protein and lipid residues were detected on the surface of biogenic SeNPs. Eventually, this strain might be efficaciously exploited for the remediation of selenite-contaminated environmental matrices due to its high SeO32- reducing efficiency. Biogenic SeNPs may also be considered for technological applications in different fields.
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Affiliation(s)
- 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
| | - Cristina Bertolini
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy; Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter EX4 4QD, UK
| | - Daniela Cecconi
- 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
| | - Massimo Micaroni
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter EX4 4QD, UK
| | - Raymond J Turner
- Biofilm Research Group, Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Clive S Butler
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter EX4 4QD, UK
| | - Giovanni Vallini
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
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Selenium reducing Citrobacter fruendii strain KP6 from Mandovi estuary and its potential application in selenium nanoparticle synthesis. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s40011-016-0815-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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41
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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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42
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Kora AJ, Rastogi L. Biomimetic synthesis of selenium nanoparticles by Pseudomonas aeruginosa ATCC 27853: An approach for conversion of selenite. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 181:231-236. [PMID: 27353373 DOI: 10.1016/j.jenvman.2016.06.029] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 06/20/2016] [Accepted: 06/20/2016] [Indexed: 06/06/2023]
Abstract
A facile and green method for the reduction of selenite was developed using a Gram-negative bacterial strain Pseudomonas aeruginosa, under aerobic conditions. During the process of bacterial conversion, the elemental selenium nanoparticles were produced. These nanoparticles were systematically characterized using various analytical techniques including UV-visible spectroscopy, XRD, Raman spectroscopy, SEM, DLS, TEM and FTIR spectroscopy techniques. The generation of selenium nanoparticles was confirmed from the appearance of red colour in the culture broth and broad absorption peaks in the UV-vis. The synthesized nanoparticles were spherical, polydisperse, ranged from 47 to 165 nm and the average particle size was about 95.9 nm. The selected-area electron diffraction, XRD patterns; and Raman spectroscopy established the amorphous nature of the fabricated nanoparticles. The IR data demonstrated the bacterial protein mediated selenite reduction and capping of the produced nanoparticles. The selenium removal was assessed at different selenite concentrations using ICP-OES and the results showed that the tested bacterial strain exhibited significant selenite reduction activity. The results demonstrate the possible application of P. aeruginosa for bioremediation of waters polluted with toxic and soluble selenite. Moreover, the potential metal reduction capability of the bacterial strain can function as green method for aerobic generation of selenium nanospheres.
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Affiliation(s)
- Aruna Jyothi Kora
- National Centre for Compositional Characterisation of Materials (NCCCM), Bhabha Atomic Research Centre (BARC), ECIL PO, Hyderabad, 500 062, India.
| | - Lori Rastogi
- National Centre for Compositional Characterisation of Materials (NCCCM), Bhabha Atomic Research Centre (BARC), ECIL PO, Hyderabad, 500 062, India.
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43
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Microbial Transformations of Selenium Species of Relevance to Bioremediation. Appl Environ Microbiol 2016; 82:4848-59. [PMID: 27260359 DOI: 10.1128/aem.00877-16] [Citation(s) in RCA: 125] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Selenium species, particularly the oxyanions selenite (SeO3 (2-)) and selenate (SeO4 (2-)), are significant pollutants in the environment that leach from rocks and are released by anthropogenic activities. Selenium is also an essential micronutrient for organisms across the tree of life, including microorganisms and human beings, particularly because of its presence in the 21st genetically encoded amino acid, selenocysteine. Environmental microorganisms are known to be capable of a range of transformations of selenium species, including reduction, methylation, oxidation, and demethylation. Assimilatory reduction of selenium species is necessary for the synthesis of selenoproteins. Dissimilatory reduction of selenate is known to support the anaerobic respiration of a number of microorganisms, and the dissimilatory reduction of soluble selenate and selenite to nanoparticulate elemental selenium greatly reduces the toxicity and bioavailability of selenium and has a major role in bioremediation and potentially in the production of selenium nanospheres for technological applications. Also, microbial methylation after reduction of Se oxyanions is another potentially effective detoxification process if limitations with low reaction rates and capture of the volatile methylated selenium species can be overcome. This review discusses microbial transformations of different forms of Se in an environmental context, with special emphasis on bioremediation of Se pollution.
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Nguyen VK, Park Y, Yu J, Lee T. Microbial selenite reduction with organic carbon and electrode as sole electron donor by a bacterium isolated from domestic wastewater. BIORESOURCE TECHNOLOGY 2016; 212:182-189. [PMID: 27099943 DOI: 10.1016/j.biortech.2016.04.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 04/02/2016] [Accepted: 04/10/2016] [Indexed: 06/05/2023]
Abstract
Selenium is said to be multifaceted element because it is essential at a low concentration but very toxic at an elevated level. For the purpose of screening a potential microorganism for selenite bioremediation, we isolated a bacterium, named strain THL1, which could perform both heterotrophic selenite reduction, using organic carbons such as acetate, lactate, propionate, and butyrate as electron donors under microaerobic condition, and electrotrophic selenite reduction, using an electrode polarized at -0.3V (vs. standard hydrogen electrode) as the sole electron donor under anaerobic condition. This bacterium determined to be a new strain of the genus Cronobacter, could remove selenite with an efficiency of up to 100%. This study is the first demonstration on a pure culture could take up electrons from an electrode to perform selenite reduction. The selenium nanoparticles produced by microbial selenite reduction might be considered for recovery and use in the nanotechnology industry.
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Affiliation(s)
- Van Khanh Nguyen
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea
| | - Younghyun Park
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea
| | - Jaecheul Yu
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea
| | - Taeho Lee
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea.
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Fernández-Llamosas H, Castro L, Blázquez ML, Díaz E, Carmona M. Biosynthesis of selenium nanoparticles by Azoarcus sp. CIB. Microb Cell Fact 2016; 15:109. [PMID: 27301452 PMCID: PMC4908764 DOI: 10.1186/s12934-016-0510-y] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 06/07/2016] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Different bacteria have been reported so far that link selenite resistance to the production of metallic selenium nanoparticles (SeNPs). Although SeNPs have many biotechnological applications in diverse areas, the molecular mechanisms involved in their microbial genesis are not fully understood. The Azoarcus genus is a physiologically versatile group of beta-proteobacteria of great environmental relevance. Azoarcus sp. CIB is a facultative anaerobe that combines the ability to degrade under aerobic and/or anaerobic conditions a wide range of aromatic compounds, including some toxic hydrocarbons such as toluene and m-xylene, with an endophytic life style in the root of rice. We unravel here an additional physiological feature of the strain CIB that is related to its resistance to selenium oxyanions and the formation of SeNPs. RESULTS This work is the first report of a member of the Azoarcus genus that is able to anaerobically grow in the presence of selenite. Electron microscopy preparations and X-ray spectroscopy analyses demonstrate the reduction of selenite to spherical electron-dense SeNPs whose average size was 123 ± 35 nm of diameter. Our data suggest that the main molecular mechanism of selenite resistance resides on an energy-dependent selenite exporter. Azoarcus cells trigger the synthesis of SeNPs when they reach the stationary-phase of growth, and either the exhaustion of electron donor or acceptor, both of which lead to starvation conditions, produce the reduction of selenite to red elemental selenium. Azoarcus becomes a promising biocatalyst, either as whole cells or cellular extracts, for the anaerobic and/or aerobic green synthesis of SeNPs. CONCLUSIONS Azoarcus turns out to be a new eco-friendly system to reduce selenite and produce spherical SeNPs. Moreover, this is the first report of a rice endophyte able to produce SeNPs. Since Azoarcus is also able to degrade both aerobically and anaerobically toxic aromatic compounds of great environmental concern, it becomes a suitable candidate for a more sustainable agricultural practice and for bioremediation strategies.
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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
- />Material Science and Metallurgical Engineering Department, Facultad de Químicas, Universidad Complutense de Madrid, Madrid, Spain
| | - María Luisa Blázquez
- />Material Science and Metallurgical Engineering Department, Facultad de Químicas, Universidad Complutense de Madrid, 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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46
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Gonzalez-Gil G, Lens PNL, Saikaly PE. Selenite Reduction by Anaerobic Microbial Aggregates: Microbial Community Structure, and Proteins Associated to the Produced Selenium Spheres. Front Microbiol 2016; 7:571. [PMID: 27199909 PMCID: PMC4844624 DOI: 10.3389/fmicb.2016.00571] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 04/05/2016] [Indexed: 12/22/2022] Open
Abstract
Certain types of anaerobic granular sludge, which consists of microbial aggregates, can reduce selenium oxyanions. To envisage strategies for removing those oxyanions from wastewater and recovering the produced elemental selenium (Se(0)), insights into the microbial community structure and synthesis of Se(0) within these microbial aggregates are required. High-throughput sequencing showed that Veillonellaceae (c.a. 20%) and Pseudomonadaceae (c.a.10%) were the most abundant microbial phylotypes in selenite reducing microbial aggregates. The majority of the Pseudomonadaceae sequences were affiliated to the genus Pseudomonas. A distinct outer layer (∼200 μm) of selenium deposits indicated that bioreduction occurred in the outer zone of the microbial aggregates. In that outer layer, SEM analysis showed abundant intracellular and extracellular Se(0) (nano)spheres, with some cells having high numbers of intracellular Se(0) spheres. Electron tomography showed that microbial cells can harbor a single large intracellular sphere that stretches the cell body. The Se(0) spheres produced by the microorganisms were capped with organic material. X-ray photoelectron spectroscopy (XPS) analysis of extracted Se(0) spheres, combined with a mathematical approach to analyzing XPS spectra from biological origin, indicated that proteins and lipids were components of the capping material associated to the Se(0) spheres. The most abundant proteins associated to the spheres were identified by proteomic analysis. Most of the proteins or peptide sequences capping the Se(0) spheres were identified as periplasmic outer membrane porins and as the cytoplasmic elongation factor Tu protein, suggesting an intracellular formation of the Se(0) spheres. In view of these and previous findings, a schematic model for the synthesis of Se(0) spheres by the microorganisms inhabiting the granular sludge is proposed.
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Affiliation(s)
- Graciela Gonzalez-Gil
- Division of Biological and Environmental Sciences and Engineering, Water Desalination and Reuse Center, King Abdullah University of Science and TechnologyThuwal, Saudi Arabia; Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water EducationDelft, Netherlands
| | - Piet N L Lens
- Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education Delft, Netherlands
| | - Pascal E Saikaly
- Division of Biological and Environmental Sciences and Engineering, Water Desalination and Reuse Center, King Abdullah University of Science and Technology Thuwal, Saudi Arabia
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