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Yuliani D, Morishita F, Imamura T, Ueki T. Vanadium Accumulation and Reduction by Vanadium-Accumulating Bacteria Isolated from the Intestinal Contents of Ciona robusta. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2024; 26:338-350. [PMID: 38451444 PMCID: PMC11043195 DOI: 10.1007/s10126-024-10300-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 02/28/2024] [Indexed: 03/08/2024]
Abstract
The sea squirt Ciona robusta (formerly Ciona intestinalis type A) has been the subject of many interdisciplinary studies. Known as a vanadium-rich ascidian, C. robusta is an ideal model for exploring microbes associated with the ascidian and the roles of these microbes in vanadium accumulation and reduction. In this study, we discovered two bacterial strains that accumulate large amounts of vanadium, CD2-88 and CD2-102, which belong to the genera Pseudoalteromonas and Vibrio, respectively. The growth medium composition impacted vanadium uptake. Furthermore, pH was also an important factor in the accumulation and localization of vanadium. Most of the vanadium(V) accumulated by these bacteria was converted to less toxic vanadium(IV). Our results provide insights into vanadium accumulation and reduction by bacteria isolated from the ascidian C. robusta to further study the relations between ascidians and microbes and their possible applications for bioremediation or biomineralization.
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Affiliation(s)
- Dewi Yuliani
- Laboratory of Molecular and Cellular Physiology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 1-3-1 Kagamiyama, Hiroshima, 739-8526, Japan
- Chemistry Department, Faculty of Mathematics and Natural Sciences, State Islamic University of Malang, Malang, 65145, Indonesia
| | - Fumihiro Morishita
- Laboratory of Molecular and Cellular Physiology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 1-3-1 Kagamiyama, Hiroshima, 739-8526, Japan
| | - Takuya Imamura
- Laboratory of Molecular and Cellular Physiology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 1-3-1 Kagamiyama, Hiroshima, 739-8526, Japan
| | - Tatsuya Ueki
- Laboratory of Molecular and Cellular Physiology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 1-3-1 Kagamiyama, Hiroshima, 739-8526, Japan.
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Lee CH, Lin DJ, Pan HR, Wu J, Liu HK, Hsu HF. Reversible Conversion of Disulfide/Dithiolate Occurring at a Vanadium(IV) Center: A Biomimetic System for Redox Exchange in Vanabin. Inorg Chem 2022; 61:19882-19889. [PMID: 36441974 DOI: 10.1021/acs.inorgchem.2c03115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ascidians use a class of cysteine-rich proteins generally referred to as vanabins to reduce vanadium ions, one of the many biological processes that involve the redox conversion between disulfide and dithiolate mediated by transition-metal ions. To further understand the nature of disulfide/dithiolate exchange facilitated by a vanadium center, we report herein a six-coordinate non-oxido VIV complex containing an unbound disulfide moiety, [VIV(PS3″)(PS1″S-S)] (1) (PS3″ = [P(C6H3-3-Me3Si-2-S)3]3-, where PS1″S-S is a disulfide form of PS3″). Complex 1 is obtained from a reaction of previously reported [VV(PS3″)(PS2″SH)] (2) (PS2″SH = [P(C6H3-3-Me3Si-2-SH)(C6H3-3-Me3Si-2-S)2] with TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidin-1-yl)oxyl) via hydrogen atom transfer. Importantly, complex 1 can be reduced by two electrons to form an eight-coordinate VIV complex, [VIV(PS3″)2]2- (4). The reaction can be reversed through a two-electron oxidation process to regenerate complex 1. The redox pathways both proceed through a common intermediate, [V(PS3″)2]- (3), that has been previously reported as a resonance form of VV-dithiolate and a VIV-(thiolate)(thiyl-radical) species. This work demonstrates an unprecedented example of reversible disulfide/dithiolate interconversion mediated by a VIV center, as well as provides insights into understanding the function of VV reductases in vanabins.
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Affiliation(s)
- Cheng-Hsun Lee
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Ding-Jyun Lin
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Hung-Ruei Pan
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - John Wu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Hsin-Kuan Liu
- Core Facility Center, National Cheng Kung University, Tainan 701, Taiwan
| | - Hua-Fen Hsu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
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Adi TK, Fujie M, Satoh N, Ueki T. The acidic amino acid-rich C-terminal domain of VanabinX enhances reductase activity, attaining 1.3- to 1.7-fold vanadium reduction. Biochem Biophys Rep 2022; 32:101349. [PMID: 36147050 PMCID: PMC9486056 DOI: 10.1016/j.bbrep.2022.101349] [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: 06/07/2022] [Revised: 09/07/2022] [Accepted: 09/13/2022] [Indexed: 11/20/2022] Open
Abstract
Ascidians accumulate extremely high levels of vanadium (V) in their blood cells. Several V-related proteins, including V-binding proteins (vanabins), have been isolated from V-accumulating ascidians. In this study, to obtain a deeper understanding of vanabins, we performed de novo transcriptome analysis of blood cells from a V-rich ascidian, Ascidia sydneiensis samea, and constructed a database containing 8532 predicted proteins. We found a novel vanabin with a unique acidic amino acid–rich C-terminal domain, designated VanabinX, in the database and studied it in detail. Reverse-transcription polymerase chain reaction analysis revealed that VanabinX was detected in all adult tissues examined, and was most prominent in blood cells and muscle tissue. We prepared recombinant proteins and performed immobilized metal ion affinity chromatography and a NADPH-coupled V(V)-reductase assay. VanabinX bound to metal ions, with increasing affinity for Cu(II) > Zn(II) > Co(II), but not to V(IV). VanabinX reduced V(V) to V(IV) at a rate of 0.170 μM per micoromolar protein within 30 min. The C-terminal acidic domain enhanced the reduction of V(V) by Vanabin2 to 1.3-fold and of VanabinX itself to 1.7-fold in trans mode. In summary, we constructed a protein database containing 8532 predicted proteins expressed in blood cells; among them, we discovered a novel vanabin, VanabinX, which enhances V reduction by vanabins. A novel vanadium-binding protein was identified from a vanadium-rich ascidian. This protein named VanabinX does not bind strongly to V(IV). VanabinX can reduce V(V) to V(IV) in a NADPH/GR/GSH cascade. The acidic C-terminal domain of vanabinX enhances V(V)-reduction of vanabins in trans mode.
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Liberti A, Bertocci I, Pollet A, Musco L, Locascio A, Ristoratore F, Spagnuolo A, Sordino P. An indoor study of the combined effect of industrial pollution and turbulence events on the gut environment in a marine invertebrate. MARINE ENVIRONMENTAL RESEARCH 2020; 158:104950. [PMID: 32217300 DOI: 10.1016/j.marenvres.2020.104950] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 02/25/2020] [Accepted: 03/07/2020] [Indexed: 06/10/2023]
Abstract
Natural storms are able to determine reworking of seabed up to considerable depths and favour suspension of sediment-associated chemicals. Yet, a direct link between exposure to resuspended contaminants and the biological effects on marine organisms have to be fully established. We exposed adults of a suspension feeder, the ascidian Ciona robusta, to polluted sediment (e.g., containing mixtures of polycyclic aromatic hydrocarbons and heavy metals) from the industrial area of Bagnoli-Coroglio under two temporal patterns ('aggregated' vs. 'spaced') of turbulence events. Then, we assessed the impact of resuspended pollutants on the ascidian gut environment via four broad categories: oxidative stress, innate immunity, host-microbiota interactions, and epithelium. An early oxidative stress response was seen after a week of exposure to static sediment. Instead, water turbulence had no effect on the antioxidant defence. The first episode of turbulent suspension induced a minimal pro-inflammatory response in the 'spaced' pattern. Mucus overproduction and a complete occlusion of the crypt lumen were found following sediment reworking. This study suggests a protective response of the gut environment in marine invertebrates exposed to environmental extremes, leading to increased susceptibility to disease and to concerns on the combined effects of chronic environmental contamination and acute disturbance events possibly associated with climate change.
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Affiliation(s)
- Assunta Liberti
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Naples, Italy.
| | - Iacopo Bertocci
- Department of Integrated Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy; Department of Biology, University of Pisa, CoNISMa, Pisa, Italy
| | | | - Luigi Musco
- Department of Integrated Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Annamaria Locascio
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Filomena Ristoratore
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Antonietta Spagnuolo
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Paolo Sordino
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Naples, Italy.
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Yamaguchi N, Yoshinaga M, Kamino K, Ueki T. Vanadium-Binding Ability of Nucleoside Diphosphate Kinase from the Vanadium-Rich Fan Worm, Pseudopotamilla occelata. Zoolog Sci 2016; 33:266-71. [PMID: 27268980 DOI: 10.2108/zs150188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Polychaete fan worms and ascidians accumulate high levels of vanadium ions. Several vanadiumbinding proteins, known as vanabins, have been found in ascidians. However, no vanadium-binding factors have been isolated from the fan worm. In the present study, we sought to identify vanadiumbinding proteins in the branchial crown of the fan worm using immobilized metal ion affinity chromatography. A nucleoside diphosphate kinase (NDK) homolog was isolated and determined to be a vanadium-binding protein. Kinase activity of the NDK homologue, PoNDK, was suppressed by the addition of V(IV), but was unaffected by V(V). The effect of V(IV) on PoNDK precedes its activation by Mg(II). This is the first report to describe the relationship between NDK and V(IV). PoNDK is located in the epidermis of the branchial crown, and its distribution is very similar to that of vanadium. These results suggest that PoNDK is associated with vanadium accumulation and metabolism in P. occelata.
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Affiliation(s)
- Nobuo Yamaguchi
- 1 Marine Biological Laboratory, Graduate School of Science, Hiroshima University, Mukaishima-cho 2445, Onomichi city, Hiroshima 722-0073, Japan
| | - Masafumi Yoshinaga
- 2 Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Japan
| | - Kei Kamino
- 3 National Institute of Technology and Evaluation, Kazusa-Kamatari 2-5-8, Kisarazu city, Chiba 292-0818, Japan
| | - Tatsuya Ueki
- 1 Marine Biological Laboratory, Graduate School of Science, Hiroshima University, Mukaishima-cho 2445, Onomichi city, Hiroshima 722-0073, Japan.,4 Department of Biological Science, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
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