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Engrola F, Correia MAS, Watson C, Romão CC, Veiros LF, Romão MJ, Santos-Silva T, Santini JM. Arsenite oxidase in complex with antimonite and arsenite oxyanions: Insights into the catalytic mechanism. J Biol Chem 2023; 299:105036. [PMID: 37442232 PMCID: PMC10448176 DOI: 10.1016/j.jbc.2023.105036] [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: 04/11/2023] [Revised: 06/27/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023] Open
Abstract
Arsenic contamination of groundwater is among one of the biggest health threats affecting millions of people in the world. There is an urgent need for efficient arsenic biosensors where the use of arsenic metabolizing enzymes can be explored. In this work, we have solved four crystal structures of arsenite oxidase (Aio) in complex with arsenic and antimony oxyanions and the structures determined correspond to intermediate states of the enzymatic mechanism. These structural data were complemented with density-functional theory calculations providing a unique view of the molybdenum active site at different time points that, together with mutagenesis data, enabled to clarify the enzymatic mechanism and the molecular determinants for the oxidation of As(III) to the less toxic As(V) species.
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Affiliation(s)
- Filipa Engrola
- UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal; Associate Laboratory i4HB - Institute for Health and Bioeconomy, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
| | - Márcia A S Correia
- UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal; Associate Laboratory i4HB - Institute for Health and Bioeconomy, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
| | - Cameron Watson
- Division of Biosciences, Institute of Structural and Molecular Biology, University College London, London, United Kingdom
| | | | - Luis F Veiros
- Centro de Química Estrutural, Institute of Molecular Sciences, Lisboa, Portugal; Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Maria João Romão
- UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal; Associate Laboratory i4HB - Institute for Health and Bioeconomy, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal.
| | - Teresa Santos-Silva
- UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal; Associate Laboratory i4HB - Institute for Health and Bioeconomy, School of Science and Technology, NOVA University Lisbon, Caparica, Portugal.
| | - Joanne M Santini
- Division of Biosciences, Institute of Structural and Molecular Biology, University College London, London, United Kingdom.
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Pei R, Ye L, Jing C. Enzyme-based electrochemical biosensor for antimonite detection in water. Biosens Bioelectron 2023; 229:115244. [PMID: 36966618 DOI: 10.1016/j.bios.2023.115244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 03/17/2023] [Accepted: 03/19/2023] [Indexed: 03/31/2023]
Abstract
Antimonite (SbIII) is a naturally occurring contaminant demanding on-site ultrasensitive detection. The enzyme-based electrochemical (EC) biosensors are promising, but the lack of specific SbIII oxidizing enzymes hindered the past efforts. Herein, we modulated the specificity of arsenite oxidase AioAB toward SbIII by regulating its spatial conformation from tight to loose using the metal-organic framework ZIF-8. The constructed EC biosensor, AioAB@ZIF-8, exhibited the substrate specificity toward SbIII at 12.8 s-1 μM-1, an order of magnitude higher than that of AsIII (1.1 s-1 μM-1). Relaxing AioAB structure in ZIF-8 was evidenced by the break of the S-S bond and the conversion of α helix to the random coil as suggested by Raman spectroscopy. Our AioAB@ZIF-8 EC sensor exhibited a dynamic linear range in 0.041-4.1 μM at a response time of 5 s, and the detection limit at 0.041 μM at a high sensitivity of 1894 nA μM-1. The insights into tuning the specificity of an enzyme shed new light on biosensing metal(loid)s without specific proteins.
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Bagade A, Nandre V, Paul D, Patil Y, Sharma N, Giri A, Kodam K. Characterisation of hyper tolerant Bacillus firmus L-148 for arsenic oxidation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 261:114124. [PMID: 32078878 DOI: 10.1016/j.envpol.2020.114124] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 02/01/2020] [Accepted: 02/01/2020] [Indexed: 06/10/2023]
Abstract
Groundwater arsenic pollution causes millions of deaths worldwide. Long term natural and anthropogenic activities have increased arsenic levels in groundwater causing higher threats of arsenic exposure. Arsenic hyper-tolerant Firmicute Bacillus firmus L-148 was isolated from arsenic limiting Lonar lake soil, which tolerated more than 3 M arsenic and could oxidize 75 mM arsenite [As(III)] in 14 days. It oxidized As(III) in presence of heavy metals and had unusual pH optima at 9.2. B. firmus L-148 was studied at the biochemical, protein, genomic and transcript level for understanding its arsenic oxidizing machinery. The proteomic and transcript analysis exhibited the presence of ars and aio operon and supported the inducible nature of ars operon. Robust, hyper-tolerant, fast As(III) oxidizing, least nutrient requiring and multi-metal resistance qualities of the strain were used in microcosm studies for bioremediation. Artificial groundwater mimicking microcosm with 75 mM As(III) was developed. Modulation of carbon source, iron and multi metals affected growth and As(III) oxidation rate. The As(III) oxidation was recorded to be 77% in 15 days in presence of sodium acetate and Fe ions. This microcosm study can be explored for bioremediation of arsenic contaminated water and followed by precipitation using other methods.
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Affiliation(s)
- Aditi Bagade
- Biochemistry Division, Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India
| | - Vinod Nandre
- Biochemistry Division, Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India
| | - Dhiraj Paul
- National Centre for Microbial Resource, National Centre for Cell Science, Pune, 411021, India
| | - Yugendra Patil
- Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - Nisha Sharma
- Biochemistry Division, Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India
| | - Ashok Giri
- Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - Kisan Kodam
- Biochemistry Division, Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India.
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Avram S, Udrea AM, Negrea A, Ciopec M, Duteanu N, Postolache C, Duda-Seiman C, Duda-Seiman D, Shaposhnikov S. Prevention of Deficit in Neuropsychiatric Disorders through Monitoring of Arsenic and Its Derivatives as Well as Through Bioinformatics and Cheminformatics. Int J Mol Sci 2019; 20:ijms20081804. [PMID: 31013686 PMCID: PMC6514589 DOI: 10.3390/ijms20081804] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 04/04/2019] [Accepted: 04/09/2019] [Indexed: 12/26/2022] Open
Abstract
Neuropsychiatric disorders are induced by various risk factors, including direct exposure to environmental chemicals. Arsenic exposure induces neurodegeneration and severe psychiatric disorders, but the molecular mechanisms by which brain damage is induced are not yet elucidated. Our aim is to better understand the molecular mechanisms of arsenic toxicity in the brain and to elucidate possible ways to prevent arsenic neurotoxicity, by reviewing significant experimental, bioinformatics, and cheminformatics studies. Brain damage induced by arsenic exposure is discussed taking in account: the correlation between neuropsychiatric disorders and the presence of arsenic and its derivatives in the brain; possible molecular mechanisms by which arsenic induces disturbances of cognitive and behavioral human functions; and arsenic influence during psychiatric treatments. Additionally, we present bioinformatics and cheminformatics tools used for studying brain toxicity of arsenic and its derivatives, new nanoparticles used as arsenic delivery systems into the human body, and experimental ways to prevent arsenic contamination by its removal from water. The main aim of the present paper is to correlate bioinformatics, cheminformatics, and experimental information on the molecular mechanism of cerebral damage induced by exposure to arsenic, and to elucidate more efficient methods used to reduce its toxicity in real groundwater.
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Affiliation(s)
- Speranta Avram
- Faculty of Biology, University of Bucharest, Splaiul Independentei 91-95, 050095 Bucharest, Romania.
| | - Ana Maria Udrea
- National Institute for Laser Plasma and Radiation Physics, Atomistilor Street 409, 077125 Magurele, Romania.
| | - Adina Negrea
- Politehnica University of Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Piata Victoriei, 2, 300006 Timisoara, Romania.
| | - Mihaela Ciopec
- Politehnica University of Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Piata Victoriei, 2, 300006 Timisoara, Romania.
| | - Narcis Duteanu
- Politehnica University of Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Piata Victoriei, 2, 300006 Timisoara, Romania.
| | - Carmen Postolache
- Faculty of Biology, University of Bucharest, Splaiul Independentei 91-95, 050095 Bucharest, Romania.
| | - Corina Duda-Seiman
- Faculty of Chemistry, Biology, Geography, West University of Timișoara, I.H.Pestalozzi 16, 300115 Timisoara, Romania.
| | - Daniel Duda-Seiman
- University of Medicine and Pharmacy "Victor Babes, Timişoara, Eftimie Murgu Square 2, 300041 Timisoara, Romania.
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