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Duborská E, Vojtková H, Matulová M, Šeda M, Matúš P. Microbial involvement in iodine cycle: mechanisms and potential applications. Front Bioeng Biotechnol 2023; 11:1279270. [PMID: 38026895 PMCID: PMC10643221 DOI: 10.3389/fbioe.2023.1279270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 10/17/2023] [Indexed: 12/01/2023] Open
Abstract
Stable iodine isotopes are essential for humans as they are necessary for producing thyroid gland hormones. However, there are hazardous radioactive iodine isotopes that are emitted into the environment through radioactive waste generated by nuclear power plants, nuclear weapon tests, and medical practice. Due to the biophilic character of iodine radionuclides and their enormous biomagnification potential, their elimination from contaminated environments is essential to prevent the spread of radioactive pollution in ecosystems. Since microorganisms play a vital role in controlling iodine cycling and fate in the environment, they also can be efficiently utilized in solving the issue of contamination spread. Thus, this paper summarizes all known on microbial processes that are involved in iodine transformation to highlight their prospects in remediation of the sites contaminated with radioactive iodine isotopes.
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Affiliation(s)
- Eva Duborská
- Faculty of Natural Sciences, Institute of Laboratory Research on Geomaterials, Comenius University in Bratislava, Bratislava, Slovakia
| | - Hana Vojtková
- Department of Environmental Engineering, Faculty of Mining and Geology, VŠB–Technical University of Ostrava, Ostrava, Czechia
| | - Michaela Matulová
- Faculty of Natural Sciences, Institute of Laboratory Research on Geomaterials, Comenius University in Bratislava, Bratislava, Slovakia
- Radioactive Waste Repository Authority (SÚRAO), Praha, Czechia
| | - Martin Šeda
- Department of Applied Chemistry, Faculty of Agriculture and Technology, University of South Bohemia, České Budějovice, Czechia
| | - Peter Matúš
- Faculty of Natural Sciences, Institute of Laboratory Research on Geomaterials, Comenius University in Bratislava, Bratislava, Slovakia
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Iino T, Oshima K, Hattori M, Ohkuma M, Amachi S. Iron corrosion concomitant with nitrate reduction by Iodidimonas nitroreducens sp. nov. isolated from iodide-rich brine associated with natural gas. Front Microbiol 2023; 14:1232866. [PMID: 37808292 PMCID: PMC10556733 DOI: 10.3389/fmicb.2023.1232866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 09/08/2023] [Indexed: 10/10/2023] Open
Abstract
Microbially influenced corrosion (MIC) may contribute significantly to corrosion-related failures in injection wells and iron pipes of iodine production facilities. In this study, the iron (Fe0) corroding activity of strain Q-1 isolated from iodide-rich brine in Japan and two Iodidimonas strains phylogenetically related to strain Q-1 were investigated under various culture conditions. Under aerobic conditions, the Fe0 foil in the culture of strain Q-1 was oxidized in the presence of nitrate and yeast extract, while those of two Iodidimonas strains were not. The amount of oxidized iron in this culture was six times higher than in the aseptic control. Oxidation of Fe0 in aerobic cultures of nitrate-reducing bacterium Q-1 was dependent on the formation of nitrite from nitrate. This Fe0 corrosion by nitrate-reducing bacterium Q-1 started after initial nitrite accumulation by day 4. Nitrate reduction in strain Q-1 is a unique feature that distinguishes it from two known species of Iodidimonas. Nitrite accumulation was supported by the encoding of genes for nitrate reductase and the missing of genes for nitrite reduction to ammonia or nitrogen gas in its genome sequence. Phylogenetic position of strain Q-1 based on the 16S rRNA gene sequence was with less than 96.1% sequence similarity to two known Iodidimonas species, and digital DNA-DNA hybridization (dDDH) values of 17.2-19.3%, and average nucleotide identity (ANI) values of 73.4-73.7% distinguished strain Q-1 from two known species. In addition of nitrate reduction, the ability to hydrolyze aesculin and gelatin hydrolysis and cellular fatty acid profiles also distinguished strain Q-1 from two known species. Consequently, a new species, named Iodidimonas nitroreducens sp. nov., is proposed for the nitrate-reducing bacterium strain Q-1T.
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Affiliation(s)
- Takao Iino
- Japan Collection of Microorganisms (JCM), RIKEN BioResource Research Center (RIKEN-BRC), Tsukuba, Japan
| | - Kenshiro Oshima
- Center for Omics and Bioinformatics, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
| | - Masahira Hattori
- Center for Omics and Bioinformatics, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
| | - Moriya Ohkuma
- Japan Collection of Microorganisms (JCM), RIKEN BioResource Research Center (RIKEN-BRC), Tsukuba, Japan
| | - Seigo Amachi
- Graduate School of Horticulture, Chiba University, Matsudo, Japan
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Grandbois RM, Santschi PH, Xu C, Mitchell JM, Kaplan DI, Yeager CM. Iodide uptake by forest soils is principally related to the activity of extracellular oxidases. Front Chem 2023; 11:1105641. [PMID: 36936531 PMCID: PMC10019592 DOI: 10.3389/fchem.2023.1105641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 02/14/2023] [Indexed: 03/06/2023] Open
Abstract
129I is a nuclear fission decay product of concern because of its long half-life (16 Ma) and propensity to bioaccumulate. Microorganisms impact iodine mobility in soil systems by promoting iodination (covalent binding) of soil organic matter through processes that are not fully understood. Here, we examined iodide uptake by soils collected at two depths (0-10 and 10-20 cm) from 5 deciduous and coniferous forests in Japan and the United States. Autoclaved soils, and soils amended with an enzyme inhibitor (sodium azide) or an antibacterial agent (bronopol), bound significantly less 125I tracer (93%, 81%, 61% decrease, respectively) than the untreated control soils, confirming a microbial role in soil iodide uptake. Correlation analyses identified the strongest significant correlation between 125I uptake and three explanatory variables, actinobacteria soil biomass (p = 6.04E-04, 1.35E-02 for Kendall-Tau and regression analysis, respectively), soil nitrogen content (p = 4.86E-04, 4.24E-03), and soil oxidase enzyme activity at pH 7.0 using the substrate L-DOPA (p = 2.83E-03, 4.33E-04) and at pH 5.5 using the ABTS (p = 5.09E-03, 3.14E-03). Together, the results suggest that extracellular oxidases, primarily of bacterial origin, are the primary catalyst for soil iodination in aerobic, surface soils of deciduous and coniferous forests, and that soil N content may be indicative of the availability of binding sites for reactive iodine species.
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Affiliation(s)
- Russell M. Grandbois
- Laboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas A&M University—Galveston, Galveston, TX, United States
| | - Peter H. Santschi
- Laboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas A&M University—Galveston, Galveston, TX, United States
| | - Chen Xu
- Laboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas A&M University—Galveston, Galveston, TX, United States
| | - Joshua M. Mitchell
- Chemical Diagnostics and Engineering, Los Alamos National Laboratory, Los Alamos, NM, United States
| | - Daniel I. Kaplan
- Savannah River Ecology Laboratory, University of Georgia, Aiken, SC, United States
| | - Chris M. Yeager
- Chemical Diagnostics and Engineering, Los Alamos National Laboratory, Los Alamos, NM, United States
- *Correspondence: Chris M. Yeager,
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Guo J, Jiang J, Peng Z, Zhong Y, Jiang Y, Jiang Z, Hu Y, Dong Y, Shi L. Global occurrence of the bacteria with capability for extracellular reduction of iodate. Front Microbiol 2022; 13:1070601. [PMID: 36504819 PMCID: PMC9732548 DOI: 10.3389/fmicb.2022.1070601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Accepted: 11/11/2022] [Indexed: 11/27/2022] Open
Abstract
The γ-proteobacterium Shewanella oneidensis MR-1 reduces iodate to iodide extracellularly. Both dmsEFAB and mtrCAB gene clusters are involved in extracellular reduction of iodate by S. oneidensis MR-1. DmsEFAB reduces iodate to hypoiodous acid and hydrogen peroxide (H2O2). Subsequently, H2O2 is reduced by MtrCAB to facilitate DmsEFAB-mediated extracellular reduction of iodate. To investigate the distribution of bacteria with the capability for extracellular reduction of iodate, bacterial genomes were systematically searched for both dmsEFAB and mtrCAB gene clusters. The dmsEFAB and mtrCAB gene clusters were found in three Ferrimonas and 26 Shewanella species. Coexistence of both dmsEFAB and mtrCAB gene clusters in these bacteria suggests their potentials for extracellular reduction of iodate. Further analyses demonstrated that these bacteria were isolated from a variety of ecosystems, including the lakes, rivers, and subsurface rocks in East and Southeast Asia, North Africa, and North America. Importantly, most of the bacteria with both dmsEFAB and mtrCAB gene clusters were found in different marine environments, which ranged from the Arctic Ocean to Antarctic coastal marine environments as well as from the Atlantic Ocean to the Indian and Pacific Oceans. Widespread distribution of the bacteria with capability for extracellular reduction of iodate around the world suggests their significant importance in global biogeochemical cycling of iodine. The genetic organization of dmsEFAB and mtrCAB gene clusters also varied substantially. The identified mtrCAB gene clusters often contained additional genes for multiheme c-type cytochromes. The numbers of dmsEFAB gene cluster detected in a given bacterial genome ranged from one to six. In latter, duplications of dmsEFAB gene clusters occurred. These results suggest different paths for these bacteria to acquire their capability for extracellular reduction of iodate.
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Affiliation(s)
- Jinzhi Guo
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China
| | - Jie Jiang
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China
| | - Zhaofeng Peng
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China,*Correspondence: Zhaofeng Peng,
| | - Yuhong Zhong
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China
| | - Yongguang Jiang
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China
| | - Zhou Jiang
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China,State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China
| | - Yidan Hu
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China
| | - Yiran Dong
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China,State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China,Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan, China,State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, China University of Geosciences, Wuhan, China
| | - Liang Shi
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geosciences, Wuhan, China,State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China,Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan, China,State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, China University of Geosciences, Wuhan, China,*Correspondence: Zhaofeng Peng,
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The Genus Iodidimonas: From Its Discovery to Potential Applications. Microorganisms 2022; 10:microorganisms10081661. [PMID: 36014078 PMCID: PMC9415286 DOI: 10.3390/microorganisms10081661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Revised: 08/12/2022] [Accepted: 08/16/2022] [Indexed: 11/16/2022] Open
Abstract
The genus Iodidimonas was recently proposed in the class Alphaproteobacteria. Iodidimonas strains are aerobic, mesophilic, neutrophilic, moderately halophilic, and chemo-organotrophic. They were first discovered in natural gas brine water containing a very high level of iodide (I−). They exhibited a unique phenotypic feature of iodide oxidation to form molecular iodine (I2). Iodidimonas was also enriched and isolated from surface seawater supplemented with iodide, and it is clearer now that their common habitats are those enriched with iodide. In such environments, Iodidimonas species seem to attack microbial competitors with the toxic form I2 to occupy their ecological niche. The iodide-oxidizing enzyme (IOX) purified from the Iodidimonas sp. strain Q-1 exhibited high catalytic efficiency for iodide and consisted of at least two proteins IoxA and IoxC. IoxA is a putative multicopper oxidase with four conserved copper-binding regions but is phylogenetically distinct from other bacterial multicopper oxidases. The IOX/iodide system could be used as a novel enzyme-based antimicrobial system which can efficiently kill Bacillus spores. Furthermore, the IOX/iodide system can be applied to the decolorization of recalcitrant dyes, where iodide may function as a novel inorganic natural redox mediator.
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Xu C, Lin P, Garimella R, Li D, Xing W, Patterson NE, Kaplan DI, Yeager CM, Hatcher PG, Santschi PH. 1H- 13C heteronuclear single quantum coherence NMR evidence for iodination of natural organic matter influencing organo-iodine mobility in the environment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 814:152546. [PMID: 34973322 DOI: 10.1016/j.scitotenv.2021.152546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 12/14/2021] [Accepted: 12/15/2021] [Indexed: 06/14/2023]
Abstract
The complex biogeochemical behavior of iodine (I) isotopes and their interaction with natural organic matter (NOM) pose a challenge for transport models. Here, we present results from iodination experiments with humic acid (HA) and fulvic acid (FA) using 1H-13C heteronuclear single quantum coherence (HSQC) nuclear magnetic resonance (NMR) spectroscopy. Even though not a quantitative approach, 1H-13C HSQC NMR corroborated that iodination of NOM occurs primarily through aromatic electrophilic substitution of proton by I, and also revealed how iodination chemically alters HA and FA in a manner that potentially affects the mobility of iodinated NOM in the environment. Three types of iodination experiments were conducted with HA and FA: a) non-enzymatic iodination by IO3- (pH 3) and I- (pH 4 and 7), b) addition of lactoperoxidase to promote I--iodination in the presence of the co-substrate, H2O2 (pH 7), and c) addition of laccase for facilitating I--iodination in the presence of O2, with or without a mediator (pH 4). When mediators or H2O2 were present, extracellular oxidases and peroxidases enhanced I- incorporation into NOM by between 54% and 3400%. Iodination of HA, which was less than that of FA, enhanced HA's stability (inferred from increases in aliphatic compounds, decreases in carbohydrate moieties, and thus increased molecular hydrophobicity) yet reduced HA's tendency to incorporate more iodine. As such, HA is expected to act more as a sink for iodine in the environment. In contrast, iodination of FA appeared to generate additional iodine binding sites, which resulted in greater iodine uptake capability and enhanced mobility (inferred from decreases in aliphatic compounds, increases in carbohydrates, and thus decreases in molecular hydrophobicity). These results indicate that certain NOM moieties may enhance while others may inhibit radioiodine mobility in the aqueous environment.
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Affiliation(s)
- Chen Xu
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77551, United States.
| | - Peng Lin
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77551, United States
| | | | - Dien Li
- Savannah River National Laboratory, Aiken, SC 29808, United States
| | - Wei Xing
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77551, United States
| | - Nicole E Patterson
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77551, United States
| | - Daniel I Kaplan
- Savannah River National Laboratory, Aiken, SC 29808, United States
| | - Chris M Yeager
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States
| | - Patrick G Hatcher
- Department of Chemistry, Old Dominion University, Norfolk, VA 23529, United States
| | - Peter H Santschi
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77551, United States
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Ebihara K, Yoshikawa J, Horiguchi H, Amachi S. Decolorization of cationic dyes under alkaline conditions by Iodidimonas sp. Q-1 multicopper oxidase. J Biosci Bioeng 2022; 133:323-328. [PMID: 35120812 DOI: 10.1016/j.jbiosc.2022.01.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 01/12/2022] [Accepted: 01/12/2022] [Indexed: 01/15/2023]
Abstract
Previously, we found that a multicopper oxidase (IOX) produced by Iodidimonas sp. Q-1, an iodide (I-)-oxidizing marine bacterium, exhibited significant decolorization activity toward various anionic dyes. In this study, the potential capacity of IOX for decolorization of cationic dyes such as malachite green (MG), crystal violet (CV), and methylene blue (MB) was determined. Decolorization of the dyes by IOX exhibited significant pH dependence, and effective decolorization was observed under alkaline conditions. At an optimum pH of 9.5, IOX decolorized more than 90% of MG, CV, and MB within 30 min, 2 h, and 6 h, respectively. The addition of iodide was indispensable for decolorization, suggesting that this halide ion serves as a redox mediator. Decolorization products of MG showed less toxicity than MG against Escherichia coli cells. These results suggest that this IOX-iodide system can be used for the decolorization and detoxification of cationic dyes under alkaline conditions.
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Affiliation(s)
- Kyota Ebihara
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo-City, Chiba 271-8510, Japan
| | - Jun Yoshikawa
- Godo Shusei Co. Ltd., 250 Nakahara, Kamihongo, Matsudo-City, Chiba 271-0064, Japan
| | - Hirofumi Horiguchi
- Godo Shusei Co. Ltd., 250 Nakahara, Kamihongo, Matsudo-City, Chiba 271-0064, Japan
| | - Seigo Amachi
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo-City, Chiba 271-8510, Japan.
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Ghosh S, Gandhi M, van Hullebusch ED, Das AP. Proteomic insights into Lysinibacillus sp.-mediated biosolubilization of manganese. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:40249-40263. [PMID: 33011949 DOI: 10.1007/s11356-020-10863-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 09/14/2020] [Indexed: 06/11/2023]
Abstract
There has been alarming depletion of manganese (Mn) reserves owing to the ongoing extensive mining operations for catering the massive industrial demand of this element. Moreover, the mining operations have been leading to the generation of Mn-rich waste, thereby contaminating both terrestrial and aquatic bodies. The current scenario necessitates the development of alternative processes for bioremediation as well as economic recovery of Mn from mining wastes. The present investigation aims to report the bioleaching of Mn by Lysinibacillus sp. from mining waste residues in the context of mine waste remediation. Results confirmed that the native isolate had a high Mn biosolubilization potential with a solubilizing efficiency of 84% at the end of a 21-day study under optimized conditions of pulp density 2% (< 150-μm particle size), pH 6.5, and temperature 30 °C. Fourier transform infrared spectroscopy (FTIR) studies followed by liquid chromatography mass spectrometry (LC-MS) analysis were used to ascertain the change in microbial protein conformation, configuration, and protein identification. The results revealed the expression of heat shock proteins (HSP) from the family HSP which is predominantly expressed in bacteria during stress conditions. This study represents the application of native bacterial strain in Mn biosolubilization. We foresee the utility of proteomics-based studies to provide a methodological framework to the underlying mechanism of metal solubilization, thereby facilitating the two-tier benefit of recovery of Mn from alternative sources as well as bioremediation of waste having high manganese content.
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Affiliation(s)
- Shreya Ghosh
- Amity Institute of Biotechnology, Amity University, New Town, Kolkata, 700135, India
| | - Mayuri Gandhi
- Centre for Research in Nano Technology & Science (CRNTS), Sophisticated Analytical Instrument Facility (SAIF), Indian Institute of Technology Bombay, Mumbai, India
| | - Eric D van Hullebusch
- Institut de physique du globe de Paris, CNRS, Université de Paris, F-75005, Paris, France
| | - Alok Prasad Das
- Department of Life Science, Rama Devi Women's University, Bhoinagar P.O, Bhubaneswar, Odisha, 751002, India.
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Iino T, Oshima K, Hattori M, Ohkuma M, Amachi S. Iodidimonas gelatinilytica sp. nov., aerobic iodide-oxidizing bacteria isolated from brine water and surface seawater. Antonie van Leeuwenhoek 2021; 114:625-631. [PMID: 33761033 DOI: 10.1007/s10482-021-01546-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 02/16/2021] [Indexed: 10/21/2022]
Abstract
Chemo-organotrophic iodide (I-)-oxidizing bacterial strains Hi-2T and Mie-1 were isolated from iodide-rich natural gas brine water in Chiba and surface seawater in Mie, Japan, respectively. Cells of strains Hi-2T and Mie-1 were aerobic, Gram-negative and rod-shaped (0.3-0.5 µm width and 1.2-4.4 µm in length). Two isolates grew optimally at 30 °C, pH 7.5 and with 3% NaCl (w/v). Iodide oxidation to form molecular iodine (I2) was a biochemically unique trait for strains Hi-2T and Mie-1. The major cellular fatty acids are C18:1ω7c, C16:1ω5c and C18:1 2-OH. A phylogenetic analysis based on the 16S rRNA gene sequence revealed that strains Hi-2T and Mie-1 were located near Iodidimonas muriae C-3T with 99.2% sequence similarity. The calculated digital DNA-DNA hybridization (dDDH) value of 65.7-65.9% between the two isolates and I. muriae C-3T was lower than the threshold of 70%, which was used for prokaryotic species delineation. Strains Hi-2T and Mie-1 differed in the hydrolysis of aesculin, the hydrolysis of gelatin and the major cellular fatty acids composition from I. muriae C-3T. Considering these biochemical properties, the major cellular fatty acids composition and dDDH value, a novel species is proposed for strains Hi-2T (= JCM 17844T = LMG 28661T) and Mie-1 (= JCM 17845 = LMG 28662), to be named Iodidimonas gelatinilytica.
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Affiliation(s)
- Takao Iino
- Japan Collection of Microorganisms, RIKEN BioResource Research Center, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan.
| | - Kenshiro Oshima
- Center for Omics and Bioinformatics, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-0882, Japan.,Laboratory of Genomics for Health and Longevity, School of Pharmacy, Kitasato University, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa, 252-0373, Japan
| | - Masahira Hattori
- Center for Omics and Bioinformatics, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-0882, Japan.,Laboratory for Microbiome Sciences, RIKEN Center for Integrative Medical Sciences, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan
| | - Moriya Ohkuma
- Japan Collection of Microorganisms, RIKEN BioResource Research Center, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan
| | - Seigo Amachi
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo, Chiba, Japan
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Góralczyk-Bińkowska A, Jasińska A, Długoński J. CHARACTERISTICS AND USE OF MULTICOPPER OXIDASES ENZYMES. ADVANCEMENTS OF MICROBIOLOGY 2019. [DOI: 10.21307/pm-2019.58.1.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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11
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Nihei R, Usami M, Taguchi T, Amachi S. Role of fungal laccase in iodide oxidation in soils. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2018; 189:127-134. [PMID: 29665575 DOI: 10.1016/j.jenvrad.2018.03.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 03/29/2018] [Accepted: 03/29/2018] [Indexed: 06/08/2023]
Abstract
Previously, we hypothesized that microbial laccase oxidizes iodide (I-) in soils to molecular iodine (I2) or hypoiodous acid (HIO), both of which are easily incorporated into natural soil organic matter, and thus plays a role in iodine sorption on soils. In this study, soil iodide oxidase activity was determined by a colorimetric assay to evaluate if laccase is responsible for iodide oxidation in soils. Three types of Japanese soil showed significant iodide oxidase activities (0.751-2.87 mU g soil-1) at pH 4.0, which decreased with increasing pH, until it was no longer detected at pH 5.5. The activity was inhibited strongly by autoclaving or by the addition of common laccase inhibitors. Similar tendency of inhibition was observed in soil laccase activity, which was determined with 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) as a substrate. Significant positive correlations (R2 values of 0.855-0.896) between iodide oxidase activity and laccase activity were observed in two of three soils. Commercially available fungal laccases showed only very low iodide oxidase activities (4.68-18.0 mU mg-1), but enhanced activities of 102-739 mU mg-1 were observed in the presence of redox mediators. Finally, we successfully isolated fungal strains with iodide-oxidizing phenotype in the presence of redox mediators. Polyacrylamide gel electrophoresis of the culture supernatant of Scytalidium sp. strain UMS and subsequent active stain revealed that the fungal laccase actually oxidized iodide in the presence of redox mediators. These results suggest that at least part of iodide in soils is oxidized by fungal laccase through the laccase-mediator system.
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Affiliation(s)
- Reiko Nihei
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo-city, Chiba 271-8510, Japan
| | - Mizuki Usami
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo-city, Chiba 271-8510, Japan
| | - Taro Taguchi
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo-city, Chiba 271-8510, Japan
| | - Seigo Amachi
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo-city, Chiba 271-8510, Japan.
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Taguchi T, Ebihara K, Yanagisaki C, Yoshikawa J, Horiguchi H, Amachi S. Decolorization of recalcitrant dyes by a multicopper oxidase produced by Iodidimonas sp. Q-1 with iodide as a novel inorganic natural redox mediator. Sci Rep 2018; 8:6717. [PMID: 29712927 PMCID: PMC5928188 DOI: 10.1038/s41598-018-25043-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 04/13/2018] [Indexed: 11/19/2022] Open
Abstract
A multicopper oxidase (IOX) produced by Iodidimonas sp. Q-1 has high catalytic efficiency for iodide (I−) oxidation to form molecular iodine (I2). In this study, the potential capacity of IOX for decolorization of recalcitrant dyes was determined. Although IOX did not decolorize any dyes in the absence of redox mediator, significant decolorization of Orange G, Indigo Carmine, Amido Black, and Remazol Brilliant Blue R (RBBR) was observed in the presence of iodide. Addition of 0.1 mM iodide was sufficient to decolorize a total of 3 mM Indigo Carmine, suggesting that iodide functions as a mediator. Such mediator-like function of iodide was not observed in commercially available fungal laccases. The IOX-iodide decolorization system showed much alkaline pH optima of 5.5–6.5 and stronger salt tolerance than fungal laccases did. In addition, actual wastewater discharged from a dyeing factory could be decolorized more than 50% by the system. Since iodide is naturally occurring, non-toxic, and cheaper than common synthetic mediators, the IOX-iodide system is potentially more advantageous than fungal laccase-mediator systems for decolorization of recalcitrant dyes.
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Affiliation(s)
- Taro Taguchi
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo City, Chiba, 271-8510, Japan
| | - Kyota Ebihara
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo City, Chiba, 271-8510, Japan
| | - Chihiro Yanagisaki
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo City, Chiba, 271-8510, Japan
| | - Jun Yoshikawa
- GODO SHUSEI Co. Ltd., 250 Nakahara, Kamihongo, Matsudo City, Chiba, 271-0064, Japan
| | - Hirofumi Horiguchi
- GODO SHUSEI Co. Ltd., 250 Nakahara, Kamihongo, Matsudo City, Chiba, 271-0064, Japan
| | - Seigo Amachi
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo City, Chiba, 271-8510, Japan.
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Tinikul R, Chenprakhon P, Maenpuen S, Chaiyen P. Biotransformation of Plant-Derived Phenolic Acids. Biotechnol J 2018; 13:e1700632. [DOI: 10.1002/biot.201700632] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/10/2017] [Indexed: 01/18/2023]
Affiliation(s)
- Ruchanok Tinikul
- Department of Biochemistry and Center for Excellence in Protein and Enzyme Technology; Faculty of Science; Mahidol University; Bangkok 10400 Thailand
| | - Pirom Chenprakhon
- Institute for Innovative Learning; Mahidol University; Nakhon Pathom 73170 Thailand
| | - Somchart Maenpuen
- Department of Biochemistry; Faculty of Science; Burapha University; Chonburi 20131 Thailand
| | - Pimchai Chaiyen
- Department of Biomolecular Science and Engineering; School of Biomolecular Science & Engineering; Vidyasirimedhi Institute of Science and Technology (VISTEC); Wangchan Valley Rayong 21210 Thailand
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14
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Yuliana T, Nakajima N, Yamamura S, Tomita M, Suzuki H, Amachi S. Draft Genome Sequence of Roseovarius sp. A-2, an Iodide-Oxidizing Bacterium Isolated from Natural Gas Brine Water, Chiba, Japan. J Genomics 2017; 5:51-53. [PMID: 28529651 PMCID: PMC5436463 DOI: 10.7150/jgen.19846] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Roseovarius sp. A-2 is a heterotrophic iodide (I-)-oxidizing bacterium isolated from iodide-rich natural gas brine water in Chiba, Japan. This strain oxidizes iodide to molecular iodine (I2) by means of an extracellular multicopper oxidase. Here we report the draft genome sequence of strain A-2. The draft genome contained 46 tRNA genes, 1 copy of a 16S-23S-5S rRNA operon, and 4,514 protein coding DNA sequences, of which 1,207 (27%) were hypothetical proteins. The genome contained a gene encoding IoxA, a multicopper oxidase previously found to catalyze the oxidation of iodide in Iodidimonas sp. Q-1. This draft genome provides detailed insights into the metabolism and potential application of Roseovarius sp. A-2.
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Affiliation(s)
- Tri Yuliana
- Graduate School of Horticulture, Chiba University, Matsudo City, Chiba, Japan.,Food Technology Department, Padjadjaran University, Bandung, Indonesia
| | - Nobuyoshi Nakajima
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Shigeki Yamamura
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan.,Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Masaru Tomita
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata, Japan.,Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Kanagawa, Japan
| | - Haruo Suzuki
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata, Japan.,Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Kanagawa, Japan
| | - Seigo Amachi
- Graduate School of Horticulture, Chiba University, Matsudo City, Chiba, Japan
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Yeager CM, Amachi S, Grandbois R, Kaplan DI, Xu C, Schwehr KA, Santschi PH. Microbial Transformation of Iodine: From Radioisotopes to Iodine Deficiency. ADVANCES IN APPLIED MICROBIOLOGY 2017; 101:83-136. [PMID: 29050668 DOI: 10.1016/bs.aambs.2017.07.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Iodine is a biophilic element that is important for human health, both as an essential component of several thyroid hormones and, on the other hand, as a potential carcinogen in the form of radioiodine generated by anthropogenic nuclear activity. Iodine exists in multiple oxidation states (-1, 0, +1, +3, +5, and +7), primarily as molecular iodine (I2), iodide (I-), iodate [Formula: see text] , or organic iodine (org-I). The mobility of iodine in the environment is dependent on its speciation and a series of redox, complexation, sorption, precipitation, and microbial reactions. Over the last 15years, there have been significant advances in iodine biogeochemistry, largely spurred by renewed interest in the fate of radioiodine in the environment. We review the biogeochemistry of iodine, with particular emphasis on the microbial processes responsible for volatilization, accumulation, oxidation, and reduction of iodine, as well as the exciting technological potential of these fascinating microorganisms and enzymes.
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16
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Medrano-Macías J, Leija-Martínez P, González-Morales S, Juárez-Maldonado A, Benavides-Mendoza A. Use of Iodine to Biofortify and Promote Growth and Stress Tolerance in Crops. FRONTIERS IN PLANT SCIENCE 2016; 7:1146. [PMID: 27602033 PMCID: PMC4993787 DOI: 10.3389/fpls.2016.01146] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/18/2016] [Indexed: 05/06/2023]
Abstract
Iodine is not considered essential for land plants; however, in some aquatic plants, iodine plays a critical role in antioxidant metabolism. In humans, iodine is essential for the metabolism of the thyroid and for the development of cognitive abilities, and it is associated with lower risks of developing certain types of cancer. Therefore, great efforts are made to ensure the proper intake of iodine to the population, for example, the iodization of table salt. In the same way, as an alternative, the use of different iodine fertilization techniques to biofortify crops is considered an adequate iodine supply method. Hence, biofortification with iodine is an active area of research, with highly relevant results. The agricultural application of iodine to enhance growth, environmental adaptation, and stress tolerance in plants has not been well explored, although it may lead to the increased use of this element in agricultural practice and thus contribute to the biofortification of crops. This review systematically presents the results published on the application of iodine in agriculture, considering different environmental conditions and farming systems in various species and varying concentrations of the element, its chemical forms, and its application method. Some studies report beneficial effects of iodine, including better growth, and changes in the tolerance to stress and antioxidant capacity, while other studies report that the applications of iodine cause no response or even have adverse effects. We suggested different assumptions that attempt to explain these conflicting results, considering the possible interaction of iodine with other trace elements, as well as the different physicochemical and biogeochemical conditions that give rise to the distinct availability and the volatilization of the element.
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Affiliation(s)
- Julia Medrano-Macías
- Departamento de Botánica, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo LeónSan Nicolás de los Garza, Mexico
| | - Paola Leija-Martínez
- Laboratorio de Fisiología, Departamento de Horticultura, Universidad Autónoma Agraria Antonio NarroSaltillo, Mexico
| | - Susana González-Morales
- Consejo Nacional de Ciencia y Tecnología, Departamento de Horticultura, Universidad Autónoma Agraria Antonio NarroSaltillo, Mexico
| | | | - Adalberto Benavides-Mendoza
- Laboratorio de Fisiología, Departamento de Horticultura, Universidad Autónoma Agraria Antonio NarroSaltillo, Mexico
- *Correspondence: Adalberto Benavides-Mendoza
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17
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A novel enzyme-based antimicrobial system comprising iodide and a multicopper oxidase isolated from Alphaproteobacterium strain Q-1. Appl Microbiol Biotechnol 2015; 99:10011-8. [PMID: 26254787 DOI: 10.1007/s00253-015-6862-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 07/15/2015] [Accepted: 07/16/2015] [Indexed: 10/23/2022]
Abstract
Alphaproteobacterium strain Q-1 produces an extracellular multicopper oxidase (IOX), which catalyzes iodide (I-) oxidation to form molecular iodine (I2). In this study, the antimicrobial activity of the IOX/iodide system was determined. Both Gram-positive and Gram-negative bacteria tested were killed completely within 5 min by 50 mU mL(-1) of IOX and 10 mM iodide. The sporicidal activity of the system was also tested and compared with a common iodophor, povidone-iodine (PVP-I). IOX (300 mU mL(-1)) killed Bacillus cereus, B. subtilis, and Geobacillus stearothermophilus spores with decimal reduction times of 2.58, 7.62, and 40.9 min, respectively. However, 0.1% PVP-I killed these spores with much longer decimal reduction times of 5.46, 38.0, and 260 min, respectively. To evaluate the more superior sporicidal activity of the IOX system over PVP-I, the amount of free iodine (non-complexed I2) was determined by an equilibrium dialysis technique. The IOX system included more than 40 mg L(-1) of free iodine, while PVP-I included at most 25 mg L(-1) free iodine. Our results suggest that the new enzyme-based antimicrobial system is effective against a wide variety of microorganisms and bacterial spores, and that its strong biocidal activity is due to its high free iodine content, which is probably maintained by re-oxidation of iodide released after oxidation of cell components by I2.
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18
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Shiroyama K, Kawasaki Y, Unno Y, Amachi S. A putative multicopper oxidase, IoxA, is involved in iodide oxidation by Roseovarius sp. strain A-2. Biosci Biotechnol Biochem 2015; 79:1898-905. [PMID: 26041311 DOI: 10.1080/09168451.2015.1052767] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Roseovarius sp. strain A-2 is an aerobic heterotrophic bacterium with a capacity for oxidizing iodide ion (I(-)) to form molecular iodine (I2). In this study, iodide-oxidizing enzyme of strain A-2 was characterized. The enzyme was an extracellular protein, and Cu(2+) ion significantly enhanced the enzyme activity in the culture supernatant. When iodide was used as the substrate, the crude enzyme showed Km and Vmax values of 4.78 mM and 25.1 U mg(-1), respectively. The enzyme was inhibited by NaN3, EDTA, KCN, and o-phenanthroline, and also had significant activities toward p-phenylenediamine and hydroquinone. Tandem mass spectrometric analysis of an active band excised from SDS-PAGE gel revealed that at least two proteins are involved in the enzyme. One of these proteins was closely related with IoxA, a multicopper oxidase previously found as a component of iodide-oxidizing enzyme of Alphaproteobacterium strain Q-1. Furthermore, a terrestrial bacterium Rhodanobacter denitrificans 116-2, which possesses an ioxA-like gene in its genome, was found to oxidize iodide. These results suggest that IoxA catalyzes the oxidation of iodide in phylogenetically distinct bacteria.
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Affiliation(s)
- Kanna Shiroyama
- a Graduate School of Horticulture , Chiba University , Matsudo-city , Japan
| | - Yasutaka Kawasaki
- a Graduate School of Horticulture , Chiba University , Matsudo-city , Japan
| | - Yusuke Unno
- b Institute for Environmental Sciences , Kamikita-gun , Japan
| | - Seigo Amachi
- a Graduate School of Horticulture , Chiba University , Matsudo-city , Japan
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19
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Lawson PG, Daum D, Czauderna R, Meuser H, Härtling JW. Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables. FRONTIERS IN PLANT SCIENCE 2015; 6:450. [PMID: 26157445 PMCID: PMC4477264 DOI: 10.3389/fpls.2015.00450] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 06/01/2015] [Indexed: 05/18/2023]
Abstract
Iodine (I) biofortification of vegetables by means of soil and foliar applications was investigated in field experiments on a sandy loam soil. Supply of iodine to the soil in trial plots fertilized with potassium iodide (KI) and potassium iodate directly before planting (0, 1.0, 2.5, 7.5, and 15 kg I ha(-1)) increased the iodine concentration in the edible plant parts. The highest iodine accumulation levels were observed in the first growing season: In butterhead lettuce and kohlrabi the desired iodine content [50-100 μg I (100 g FM)(-1)] was obtained or exceeded at a fertilizer rate of 7.5 kg IO3 (-)-I ha(-1) without a significant yield reduction or impairment of the marketable quality. In contrast, supplying KI at the same rate resulted in a much lower iodine enrichment and clearly visible growth impairment. Soil applied iodine was phytoavailable only for a short period of time as indicated by a rapid decline of CaCl2-extractable iodine in the top soil. Consequently, long-term effects of a one-time iodine soil fertilization could not be observed. A comparison between the soil and the foliar fertilization revealed a better performance of iodine applied aerially to butterhead lettuce, which reached the desired iodine accumulation in edible plant parts at a fertilizer rate of 0.5 kg I(-)-I ha(-1). In contrast, the iodine content in the tuber of sprayed kohlrabi remained far below the targeted range. The results indicate that a sufficient spreading of iodine applied on the edible plant parts is crucial for the efficiency of the foliar approach and leafy vegetables are the more suitable target crops. The low iodine doses needed as well as the easy and inexpensive application may favor the implementation of foliar sprays as the preferred iodine biofortification strategy in practice.
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Affiliation(s)
- Patrick G. Lawson
- Department of Plant Nutrition, Faculty of Agricultural Sciences and Landscape Architecture, University of Applied Sciences of OsnabrückOsnabrück, Germany
| | - Diemo Daum
- Department of Plant Nutrition, Faculty of Agricultural Sciences and Landscape Architecture, University of Applied Sciences of OsnabrückOsnabrück, Germany
- *Correspondence: Diemo Daum, Department of Plant Nutrition, Faculty of Agricultural Sciences and Landscape Architecture, University of Applied Sciences of Osnabrück, Oldenburger Landstrasse 24, 49090 Osnabrück, NDS, Germany,
| | - Roman Czauderna
- Department of Plant Nutrition, Faculty of Agricultural Sciences and Landscape Architecture, University of Applied Sciences of OsnabrückOsnabrück, Germany
| | - Helmut Meuser
- Department of Soil Protection and Restoration, Faculty of Agricultural Sciences and Landscape Architecture, University of Applied Sciences of OsnabrückOsnabrück, Germany
| | - Joachim W. Härtling
- Department of Cultural Studies and Geosciences, Institute of Geography, University of OsnabrückOsnabrück, Germany
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Draft genome sequence of strain q-1, an iodide-oxidizing alphaproteobacterium isolated from natural gas brine water. GENOME ANNOUNCEMENTS 2014; 2:2/4/e00659-14. [PMID: 24994802 PMCID: PMC4082002 DOI: 10.1128/genomea.00659-14] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Here we report the draft genome sequence of strain Q-1, an iodide (I−)-oxidizing heterotrophic bacterium in the class Alphaproteobacteria isolated from natural gas brine water. The genome sequence contained a multicopper oxidase gene probably responsible for iodide oxidation. A photosynthetic gene cluster was found but genes for carbon-fixation were absent.
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21
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Ihssen J, Schubert M, Thöny-Meyer L, Richter M. Laccase catalyzed synthesis of iodinated phenolic compounds with antifungal activity. PLoS One 2014; 9:e89924. [PMID: 24594755 PMCID: PMC3940670 DOI: 10.1371/journal.pone.0089924] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 01/23/2014] [Indexed: 11/21/2022] Open
Abstract
Iodine is a well known antimicrobial compound. Laccase, an oxidoreductase which couples the one electron oxidation of diverse phenolic and non-phenolic substrates to the reduction of oxygen to water, is capable of oxidizing unreactive iodide to reactive iodine. We have shown previously that laccase-iodide treatment of spruce wood results in a wash-out resistant antimicrobial surface. In this study, we investigated whether phenolic compounds such as vanillin, which resembles sub-structures of softwood lignin, can be directly iodinated by reacting with laccase and iodide, resulting in compounds with antifungal activity. HPLC-MS analysis showed that vanillin was converted to iodovanillin by laccase catalysis at an excess of potassium iodide. No conversion of vanillin occurred in the absence of enzyme. The addition of redox mediators in catalytic concentrations increased the rate of iodide oxidation ten-fold and the yield of iodovanillin by 50%. Iodinated phenolic products were also detected when o-vanillin, ethyl vanillin, acetovanillone and methyl vanillate were incubated with laccase and iodide. At an increased educt concentration of 0.1 M an almost one to one molar ratio of iodide to vanillin could be used without compromising conversion rate, and the insoluble iodovanillin product could be recovered by simple centrifugation. The novel enzymatic synthesis procedure fulfills key criteria of green chemistry. Biocatalytically produced iodovanillin and iodo-ethyl vanillin had significant growth inhibitory effects on several wood degrading fungal species. For Trametes versicolor, a species causing white rot of wood, almost complete growth inhibition and a partial biocidal effect was observed on agar plates. Enzymatic tests indicated that the iodinated compounds acted as enzyme responsive, antimicrobial materials.
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Affiliation(s)
- Julian Ihssen
- Laboratory for Biomaterials, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland
| | - Mark Schubert
- Laboratory for Applied Wood Materials, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland
| | - Linda Thöny-Meyer
- Laboratory for Biomaterials, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland
| | - Michael Richter
- Laboratory for Biomaterials, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland
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22
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Oba Y, Futagami T, Amachi S. Enrichment of a microbial consortium capable of reductive deiodination of 2,4,6-triiodophenol. J Biosci Bioeng 2014; 117:310-7. [DOI: 10.1016/j.jbiosc.2013.08.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 08/13/2013] [Accepted: 08/20/2013] [Indexed: 12/01/2022]
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Superoxide production by a manganese-oxidizing bacterium facilitates iodide oxidation. Appl Environ Microbiol 2014; 80:2693-9. [PMID: 24561582 DOI: 10.1128/aem.00400-14] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The release of radioactive iodine (i.e., iodine-129 and iodine-131) from nuclear reprocessing facilities is a potential threat to human health. The fate and transport of iodine are determined primarily by its redox status, but processes that affect iodine oxidation states in the environment are poorly characterized. Given the difficulty in removing electrons from iodide (I(-)), naturally occurring iodide oxidation processes require strong oxidants, such as Mn oxides or microbial enzymes. In this study, we examine iodide oxidation by a marine bacterium, Roseobacter sp. AzwK-3b, which promotes Mn(II) oxidation by catalyzing the production of extracellular superoxide (O2(-)). In the absence of Mn(2+), Roseobacter sp. AzwK-3b cultures oxidized ∼90% of the provided iodide (10 μM) within 6 days, whereas in the presence of Mn(II), iodide oxidation occurred only after Mn(IV) formation ceased. Iodide oxidation was not observed during incubations in spent medium or with whole cells under anaerobic conditions or following heat treatment (boiling). Furthermore, iodide oxidation was significantly inhibited in the presence of superoxide dismutase and diphenylene iodonium (a general inhibitor of NADH oxidoreductases). In contrast, the addition of exogenous NADH enhanced iodide oxidation. Taken together, the results indicate that iodide oxidation was mediated primarily by extracellular superoxide generated by Roseobacter sp. AzwK-3b and not by the Mn oxides formed by this organism. Considering that extracellular superoxide formation is a widespread phenomenon among marine and terrestrial bacteria, this could represent an important pathway for iodide oxidation in some environments.
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Jiménez DJ, Korenblum E, van Elsas JD. Novel multispecies microbial consortia involved in lignocellulose and 5-hydroxymethylfurfural bioconversion. Appl Microbiol Biotechnol 2013; 98:2789-803. [PMID: 24113822 DOI: 10.1007/s00253-013-5253-7] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 09/03/2013] [Accepted: 09/07/2013] [Indexed: 10/26/2022]
Abstract
To develop a targeted metagenomics approach for the analysis of novel multispecies microbial consortia involved in the bioconversion of lignocellulose and furanic compounds, we applied replicated sequential batch aerobic enrichment cultures with either pretreated or untreated wheat straw as the sources of carbon and energy. After each transfer, exponential growth of bacteria was detected using microscopic cell counts, indicating that the substrate was being utilized. In batch, the final bacterial abundances increased from an estimated 5 to 8.7-9.5 log 16S rRNA gene copy numbers/ml. The abundances of fungal propagules showed greater variation, i.e., between 5.4 and 8.0 log ITS1 copies/ml. Denaturing gradient gel electrophoresis analyses showed that the bacterial consortia in both treatments reached approximate structural stability after six transfers. Moreover, the structures of the fungal communities were strongly influenced by substrate treatment. A total of 124 bacterial strains were isolated from the two types of enrichment cultures. The most abundant strains were affiliated with the genera Raoultella/Klebsiella, Kluyvera, Citrobacter, Enterobacter, Pseudomonas, Acinetobacter, Flavobacterium and Arthrobacter. Totals of 43 and 11 strains obtained from the untreated and pretreated substrates, respectively, showed (hemi)cellulolytic activity (CMC-ase and xylanase), whereas 96 strains were capable of growth in 7.5 mM 5-hydroxymethylfurfural. About 50 % of the latter showed extracellular oxidoreductase activity as detected by a novel iodide oxidation method. Also, (hemi)cellulolytic fungal strains related to Coniochaeta, Plectosphaerella and Penicillium were isolated. One Trichosporon strain was isolated from pretreated wheat straw. The two novel bacterial-fungal consortia are starting points for lignocellulose degradation applications.
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Affiliation(s)
- Diego Javier Jiménez
- Department of Microbial Ecology, Center for Ecological and Evolutionary Studies (CEES), University of Groningen (RUG), Nijenborgh 7, 9747AG, Groningen, The Netherlands,
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Seki M, Oikawa JI, Taguchi T, Ohnuki T, Muramatsu Y, Sakamoto K, Amachi S. Laccase-catalyzed oxidation of iodide and formation of organically bound iodine in soils. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:390-397. [PMID: 23194146 DOI: 10.1021/es303228n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Laccase oxidizes iodide to molecular iodine or hypoiodous acid, both of which are easily incorporated into natural soil organic matter. In this study, iodide sorption and laccase activity in 2 types of Japanese soil were determined under various experimental conditions to evaluate possible involvement of this enzyme in the sorption of iodide. Batch sorption experiment using radioactive iodide tracer ((125)I(-)) revealed that the sorption was significantly inhibited by autoclaving (121 °C, 40 min), heat treatment (80 and 100 °C, 10 min), γ-irradiation (30 kGy), N(2) gas flushing, and addition of reducing agents and general laccase inhibitors (KCN and NaN(3)). Interestingly, very similar tendency of inhibition was observed in soil laccase activity, which was determined using 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) as a substrate. The partition coefficient (K(d): mL g(-1)) for iodide and specific activity of laccase in soils (Unit g(-1)) showed significant positive correlation in both soil samples. Addition of a bacterial laccase with an iodide-oxidizing activity to the soils strongly enhanced the sorption of iodide. Furthermore, the enzyme addition partially restored iodide sorption capacity of the autoclaved soil samples. These results suggest that microbial laccase is involved in iodide sorption on soils through the oxidation of iodide.
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Affiliation(s)
- Miharu Seki
- Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo City, Chiba 271-8510, Japan
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26
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Watson K, Farré MJ, Knight N. Strategies for the removal of halides from drinking water sources, and their applicability in disinfection by-product minimisation: a critical review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2012; 110:276-98. [PMID: 22810000 DOI: 10.1016/j.jenvman.2012.05.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 05/15/2012] [Accepted: 05/30/2012] [Indexed: 05/23/2023]
Abstract
The presence of bromide (Br(-)) and iodide (I(-)) in source waters leads to the formation of brominated and iodinated disinfection by-products (DBPs), which are often more toxic than their chlorinated analogues. The increasing scarcity of water resources in Australia is leading to use of impaired and alternative water supplies with high bromide and iodide levels, which may result in the production of more brominated and iodinated DBPs. This review aims to provide a summary of research into bromide and iodide removal from drinking water sources. Bromide and iodide removal techniques have been broadly classified into three categories, namely; membrane, electrochemical and adsorptive techniques. Reverse osmosis, nanofiltration and electrodialysis membrane techniques are reviewed. The electrochemical techniques discussed are electrolysis, capacitive deionization and membrane capacitive deionization. Studies on bromide and iodide removal using adsorptive techniques including; layered double hydroxides, impregnated activated carbons, carbon aerogels, ion exchange resins, aluminium coagulation and soils are also assessed. Halide removal techniques have been compared, and areas for future research have been identified.
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Affiliation(s)
- K Watson
- School of Environment, Griffith University, Southport, Queensland 4222, Australia
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