1
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Wilson LA, Melville JN, Pedroso MM, Krco S, Hoelzle R, Zaugg J, Southam G, Virdis B, Evans P, Supper J, Harmer JR, Tyson G, Clark A, Schenk G, Bernhardt PV. Kinetic, electrochemical and spectral characterization of bacterial and archaeal rusticyanins; unexpected stability issues and consequences for applications in biotechnology. J Inorg Biochem 2024; 256:112539. [PMID: 38593609 DOI: 10.1016/j.jinorgbio.2024.112539] [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: 01/24/2024] [Revised: 03/21/2024] [Accepted: 03/21/2024] [Indexed: 04/11/2024]
Abstract
Motivated by the ambition to establish an enzyme-driven bioleaching pathway for copper extraction, properties of the Type-1 copper protein rusticyanin from Acidithiobacillus ferrooxidans (AfR) were compared with those from an ancestral form of this enzyme (N0) and an archaeal enzyme identified in Ferroplasma acidiphilum (FaR). While both N0 and FaR show redox potentials similar to that of AfR their electron transport rates were significantly slower. The lack of a correlation between the redox potentials and electron transfer rates indicates that AfR and its associated electron transfer chain evolved to specifically facilitate the efficient conversion of the energy of iron oxidation to ATP formation. In F. acidiphilum this pathway is not as efficient unless it is up-regulated by an as of yet unknown mechanism. In addition, while the electrochemical properties of AfR were consistent with previous data, previously unreported behavior was found leading to a form that is associated with a partially unfolded form of the protein. The cyclic voltammetry (CV) response of AfR immobilized onto an electrode showed limited stability, which may be connected to the presence of the partially unfolded state of this protein. Insights gained in this study may thus inform the engineering of optimized rusticyanin variants for bioleaching processes as well as enzyme-catalyzed solubilization of copper-containing ores such as chalcopyrite.
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Affiliation(s)
- Liam A Wilson
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Jamie N Melville
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Marcelo M Pedroso
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Stefan Krco
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Robert Hoelzle
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; Australian Centre for Ecogenomics, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Julian Zaugg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; Australian Centre for Ecogenomics, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Gordon Southam
- School of the Environment, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Bernardino Virdis
- Australian Centre for Water and Environmental Biotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Paul Evans
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; Australian Centre for Ecogenomics, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Jenna Supper
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; Australian Centre for Ecogenomics, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Jeffrey R Harmer
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Gene Tyson
- Centre for Microbiome Research, Queensland University of Technology, Woolloongabba, QLD 4102, Australia
| | - Alice Clark
- Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Gerhard Schenk
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; Australian Centre for Ecogenomics, The University of Queensland, Brisbane, QLD 4072, Australia; Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia; Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.
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2
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Kapuścińska K, Dukała Z, Doha M, Ansari E, Wang J, Brudvig GW, Brooks B, Amin M. Bridging the Coordination Chemistry of Small Compounds and Metalloproteins Using Machine Learning. J Chem Inf Model 2024; 64:2586-2593. [PMID: 38054243 DOI: 10.1021/acs.jcim.3c01564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Metalloproteins require metal ions as cofactors to catalyze specific reactions with remarkable efficiency and specificity. In various electron transfer reactions, metals in the active sites change their oxidation states to facilitate the biochemical reactions. Cryogenic electron microscopy, X-ray, and X-ray free electron laser (XFEL) crystallography are used to image metalloproteins to understand the reaction mechanisms. However, radiation damage in cryoEM and X-ray crystallography, and the challenge of generating homogeneous crystals and keeping the appropriate experimental conditions for all the crystals in XFEL crystallography, may alter the oxidation states. Here, we build machine learning models trained on a large data set from the Cambridge Crystallographic Data Center to evaluate the metal oxidation states. The models yield high accuracy scores (from 82% to 94%) for all metals in the small molecules. Then, they were used to predict the oxidation states of more than 30 000 metal clusters in metalloproteins with Fe, Mn, Co, and Cu in their active sites. We found that most of the metals exist in the lower oxidation states (Fe2+ 77%, Mn2+ 85%, Co2+ 65%, and Cu+ 64%), and these populations correlate with the standard reduction potentials of the metal ions. Furthermore, we found no clear correlation between these populations and the resolution of the structures, which suggests no significant dependence of these predictions on the resolution. Our models represent a valuable tool for evaluating the oxidation states of the metals in metalloproteins imaged with different techniques. The data files and the machine learning code are available in a public GitHub repository: https://github.com/mamin03/OxitationStatesMetalloprotein.git.
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Affiliation(s)
- Katarzyna Kapuścińska
- Department of Sciences, University College Groningen, University of Groningen, 9718 BG Groningen, The Netherlands
| | - Zofia Dukała
- Department of Sciences, University College Groningen, University of Groningen, 9718 BG Groningen, The Netherlands
| | - Mekhola Doha
- Department of Sciences, University College Groningen, University of Groningen, 9718 BG Groningen, The Netherlands
| | - Eman Ansari
- Department of Sciences, University College Groningen, University of Groningen, 9718 BG Groningen, The Netherlands
| | - Jimin Wang
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Gary W Brudvig
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Bernand Brooks
- Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, United States
| | - Muhamed Amin
- Department of Sciences, University College Groningen, University of Groningen, 9718 BG Groningen, The Netherlands
- Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, United States
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3
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Joshua Ashaolu T, Lee CC, Opeolu Ashaolu J, Pourjafar H, Jafari SM. Metal-binding peptides and their potential to enhance the absorption and bioavailability of minerals. Food Chem 2023; 428:136678. [PMID: 37418874 DOI: 10.1016/j.foodchem.2023.136678] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 06/07/2023] [Accepted: 06/18/2023] [Indexed: 07/09/2023]
Abstract
Minerals including calcium, iron, zinc, magnesium, and copper have several human nutritional functions due to their metabolic activities. Body tissues require sufficient levels of a variety of micronutrients to maintain their health. To achieve these micronutrient needs, dietary consumption must be adequate. Dietary proteins may regulate the biological functions of the body in addition to acting as nutrients. Some peptides encoded in the native protein sequences are primarily responsible for the absorption and bioavailability of minerals in physiological functions. Metal-binding peptides (MBPs) were discovered as potential agents for mineral supplements. Nevertheless, sufficient studies on how MBPs affect the biological functions of minerals are lacking. The hypothesis is that the absorption and bioavailability of minerals are significantly influenced by peptides, and these properties are further enhanced by the configuration and attribute of the metal-peptide complex. In this review, the production of MBPs is discussed using various key parameters such as the protein sources and amino acid residues, enzymatic hydrolysis, purification, sequencing and synthesis and in silico analysis of MBPs. The mechanisms of metal-peptide complexes as functional food ingredients are elucidated, including metal-peptide ratio, precursors and ligands, complexation reaction, absorbability and bioavailability. Finally, the characteristics and application of different metal-peptide complexes are also described.
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Affiliation(s)
- Tolulope Joshua Ashaolu
- Institute for Global Health Innovations, Duy Tan University, Da Nang 550000, Viet Nam; Faculty of Medicine, Duy Tan University, Da Nang 550000, Viet Nam
| | - Chi Ching Lee
- Istanbul Sabahattin Zaim University, Faculty of Engineering and Natural Sciences, Department of Food Engineering, Istanbul, Turkey
| | - Joseph Opeolu Ashaolu
- Department of Public Health, Faculty of Basic Medical Sciences, Redeemers University, PMB 230, Ede, Osun State, Nigeria
| | - Hadi Pourjafar
- Dietary Supplements and Probiotic Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Seid Mahdi Jafari
- Department of Food Materials and Process Design Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
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4
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Llorca MG, Martínez-Espinosa RM. Assessment of Haloferax mediterranei Genome in Search of Copper-Molecular Machinery With Potential Applications for Bioremediation. Front Microbiol 2022; 13:895296. [PMID: 35783429 PMCID: PMC9240420 DOI: 10.3389/fmicb.2022.895296] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 05/27/2022] [Indexed: 11/13/2022] Open
Abstract
Heavy metals are essential micronutrients at low concentrations, serving as cofactors for relevant microbial enzymes (i.e., respiratory nitrate and nitrite reductases NADH dehydrogenase-2, amine oxidase, etc.), but they become harmful cellular intoxicants at significant low concentrations compared to other chemical compounds. The increasing need to incorporate bioremediation in the removal of heavy metals and other contaminants from wastewaters has led extremophiles to the spotlight of research. The haloarchaeon Haloferax mediterranei has promising physiological characteristics regarding bioremediation. However, little is known about how haloarchaea manage to resist high concentrations of heavy metals in the environment. The aim of this work is to develop bioinformatics research as the first step for further omics-based studies to shed light on copper metabolism in haloarchaea by analyzing H. mediterranei genome (strain ATCC 33500). To reach this aim, genome and protein databases have been consulted, and copper-related genes have been identified. BLAST analysis has been carried out to find similarities between copper resistance genes described from other microorganisms and H. mediterranei genes. Plausible copper importer genes, genes coding for siderophores, and copper exporters belonging to P1B-type ATPase group have been found apart from genes encoding copper chaperones, metal-responsive transcriptional regulators, and several proteins belonging to the cupredoxin superfamily: nitrite reductase, nitrous oxide reductases, cytochrome c oxidases, multicopper oxidases, and small blue copper proteins from the amicyanin/pseudoazurin families as halocyanins. As the presence of heavy metals causes oxidative stress, genes coding for proteins involved in antioxidant mechanisms have been also explored: thioredoxin, glutaredoxin, peroxiredoxin, catalase, and γ-glutamylcysteine as an analog of glutathione. Bioinformatic-based analysis of H. mediterranei genome has revealed a set of genes involved in copper metabolism that could be of interest for bioremediation purposes. The analysis of genes involved in antioxidative mechanisms against heavy metals makes it possible to infer the capability of H. mediterranei to synthesize inorganic polyphosphate granules against oxidative stress.
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Affiliation(s)
- Marina García Llorca
- Biochemistry and Molecular Biology Division, Department of Agrochemistry and Biochemistry, Faculty of Sciences, University of Alicante, Alicante, Spain
| | - Rosa María Martínez-Espinosa
- Biochemistry and Molecular Biology Division, Department of Agrochemistry and Biochemistry, Faculty of Sciences, University of Alicante, Alicante, Spain
- Multidisciplinary Institute for Environmental Studies “Ramón Margalef”, University of Alicante, Alicante, Spain
- *Correspondence: Rosa María Martínez-Espinosa,
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5
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Chmielowska-Bąk J, Shcheglova E, Rosik K, Yushin N, Zinicovscaia I, Deckert J. Oxidative RNA Modifications as an Early Response of Soybean ( Glycine max L.) Exposed to Copper and Lead. FRONTIERS IN PLANT SCIENCE 2022; 12:828620. [PMID: 35173755 PMCID: PMC8841741 DOI: 10.3389/fpls.2021.828620] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 12/30/2021] [Indexed: 06/14/2023]
Abstract
Plant exposure to metals is associated with the accumulation of reactive oxygen species, which mediate the oxidation of various molecules including lipids, proteins, and nucleic acids. The aim of the present study is the evaluation of the impact of short-term Cu and Pb treatment on oxidative events in the roots of soybean seedlings, with special emphasis on RNA oxidation. The results show that an increase in total RNA oxidative modification, 8-hydroxyguanosine (8-OHG), constitutes a very early response to both applied metals, observed already within the first hour of treatment. Exposure to Cu and Pb resulted also in the increase in superoxide anion and hydrogen peroxide levels and intensified lipid peroxidation. However, these responses were most prominent after longer treatment times. On the other hand, no changes were observed in the level of protein carbonylation. It can be concluded that 8-OHG enrichment in total RNA constitutes one of the earliest reactions to metals, which precedes the symptoms of oxidative stress.
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Affiliation(s)
- Jagna Chmielowska-Bąk
- Department of Plant Ecophysiology, Faculty of Biology, Institute of Experimental Biology, Adam Mickiewicz University, Poznań, Poland
| | - Ekaterina Shcheglova
- Department of Plant Ecophysiology, Faculty of Biology, Institute of Experimental Biology, Adam Mickiewicz University, Poznań, Poland
| | - Konrad Rosik
- Department of Plant Ecophysiology, Faculty of Biology, Institute of Experimental Biology, Adam Mickiewicz University, Poznań, Poland
| | - Nikita Yushin
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia
| | - Inga Zinicovscaia
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Magurele, Romania
| | - Joanna Deckert
- Department of Plant Ecophysiology, Faculty of Biology, Institute of Experimental Biology, Adam Mickiewicz University, Poznań, Poland
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6
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Lan Y, Zhang K, Wang Y, Wu J, Lin M, Yan H, Xiang Y. Comparative analysis of the stellacyanins (SCs) family and focus on drought resistance of PtSC18 in Populus trichocarpa. Gene 2021; 813:146106. [PMID: 34953936 DOI: 10.1016/j.gene.2021.146106] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/28/2021] [Accepted: 11/16/2021] [Indexed: 11/18/2022]
Abstract
Stellacyanin (SC) is a type I (blue) copper protein, which plays a crucial role in plant growth and stress response. However, the comprehensive analysis and functional research of SCs in the woody plant is still lacking. Here, a total of 74 SCs were collected and identified from Arabidopsis, papaya, grape, rice and poplar. Bioinformatics was used to analyze the gene structure, protein structure and evolutionary relationship of 74 genes, especially 19 SCs in Populus trichocarpa. Based on the RNA-seq data, expression pattern of SCs in poplar under cold, high temperature, drought and salt stress were further analyzed. Subsequently, a key candidate gene PtSC18 that strongly responded to drought stress was screened. Subcellular localization experiment exhibited that PtSC18 was localized in the nucleus and plasma membrane. Overexpression of PtSC18 enhanced drought tolerance of transgenic Arabidopsis by improving water retention and reducing oxidative damage. Measurements of physiological indicators, including chlorophyll, H2O2, malondialdehyde content, peroxidase and catalase enzyme activities and electrical conductivity, all supported this conclusion. More importantly, PtSC18 enhanced the expression of some stress-related genes in transgenic Arabidopsis. Overall, our results lay a foundation for understanding the structure and function of PtSCs and provide useful gene resources for breeding through genetic engineering.
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Affiliation(s)
- Yangang Lan
- Laboratory of Modern Biotechnology, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
| | - Kaimei Zhang
- Laboratory of Modern Biotechnology, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
| | - Yamei Wang
- Laboratory of Modern Biotechnology, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
| | - Jing Wu
- Laboratory of Modern Biotechnology, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
| | - Miao Lin
- Laboratory of Modern Biotechnology, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
| | - Hanwei Yan
- Laboratory of Modern Biotechnology, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China.
| | - Yan Xiang
- Laboratory of Modern Biotechnology, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China.
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7
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Gong B, Bai E, Feng X, Yi L, Wang Y, Chen X, Zhu X, Duan Y, Huang Y. Characterization of Chalkophomycin, a Copper(II) Metallophore with an Unprecedented Molecular Architecture. J Am Chem Soc 2021; 143:20579-20584. [PMID: 34851100 DOI: 10.1021/jacs.1c09311] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Metals play essential roles in life by coordination with small molecules, proteins, and nucleic acids. Although the coordination of copper ions in many proteins and methanobactins is known, the coordination chemistry of Cu(II) in natural products and their biological functions remain underexplored. Herein, we report the discovery of a Cu(II)-binding natural product, chalkophomycin (CHM, 1), from Streptomyces sp. CB00271, featuring an asymmetric square-coordination system of a bidentate diazeniumdiolate and a conjugated 1H-pyrrole 1-oxide-oxazoline. The structure of 1 may inspire the synthesis of Cu(II) chelators against neurodegenerative diseases or Cu(II)-based antitumor therapeutics.
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Affiliation(s)
- Bang Gong
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China
| | - Enhe Bai
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China
| | - Xueqiong Feng
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China
| | - Liwei Yi
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China
| | - Yeji Wang
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China
| | - Xin Chen
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China
| | - Xiangcheng Zhu
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China.,Hunan Engineering Research Center of Combinatorial Biosynthesis and Natural Product Drug Discovery, Changsha, 410011, Hunan, China.,National Engineering Research Center of Combinatorial Biosynthesis for Drug Discovery, 410011, Changsha, Hunan, China
| | - Yanwen Duan
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China.,Hunan Engineering Research Center of Combinatorial Biosynthesis and Natural Product Drug Discovery, Changsha, 410011, Hunan, China.,National Engineering Research Center of Combinatorial Biosynthesis for Drug Discovery, 410011, Changsha, Hunan, China
| | - Yong Huang
- Xiangya International Academy of Translational Medicine at Central South University, Changsha, 410013, Hunan, China.,National Engineering Research Center of Combinatorial Biosynthesis for Drug Discovery, 410011, Changsha, Hunan, China
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8
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Durand A, Fouesnard M, Bourbon ML, Steunou AS, Lojou E, Dorlet P, Ouchane S. A periplasmic cupredoxin with a green CuT1.5 center is involved in bacterial copper tolerance. Metallomics 2021; 13:6428408. [PMID: 34791351 DOI: 10.1093/mtomcs/mfab067] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 11/05/2021] [Indexed: 12/26/2022]
Abstract
The importance of copper resistance pathways in pathogenic bacteria is now well recognized, since macrophages use copper to fight bacterial infections. Additionally, considering the increase of antibiotic resistance, growing attention is given to the antimicrobial properties of copper. It is of primary importance to understand how bacteria deal with copper. The Cu-resistant cuproprotein CopI is present in many human bacterial pathogens and environmental bacteria and crucial under microaerobiosis (conditions for most pathogens to thrive within their host). Hence, understanding its mechanism of function is essential. CopI proteins share conserved histidine, cysteine, and methionine residues that could be ligands for different copper binding sites, among which the cupredoxin center could be involved in the protein function. Here, we demonstrated that Vibrio cholerae and Pseudomonas aeruginosa CopI restore the Cu-resistant phenotype in the Rubrivivax gelatinosus ΔcopI mutant. We identified that Cys125 (ligand in the cupredoxin center) and conserved histidines and methionines are essential for R. gelatinosus CopI (RgCopI) function. We also performed spectroscopic analyses of the purified RgCopI protein and showed that it is a green cupredoxin able to bind a maximum of three Cu(II) ions: (i) a green Cu site (CuT1.5), (ii) a type 2 Cu binding site (T2) located in the N-terminal region, and (iii) a third site with a yet unidentified location. CopI is therefore one member of the poorly described CuT1.5 center cupredoxin family. It is unique, since it is a single-domain cupredoxin with more than one Cu site involved in Cu resistance.
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Affiliation(s)
- Anne Durand
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Mélanie Fouesnard
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Marie-Line Bourbon
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Anne-Soisig Steunou
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | | | - Pierre Dorlet
- CNRS, Aix-Marseille Université, BIP, IMM, Marseille, France
| | - Soufian Ouchane
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
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9
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Frank P, Benfatto M. Symmetry Breaking in Solution-Phase [Cu(tsc) 2(H 2O) 2] 2+: Emergent Asymmetry in Cu-S Distances and in Covalence. J Phys Chem B 2021; 125:10779-10795. [PMID: 34546762 DOI: 10.1021/acs.jpcb.1c05022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The structure of aqueous Cu(II)-bis-thiosemicarbazide, [Cu(tsc)2]2+, is reported following EXAFS and MXAN analyses of the copper K-edge X-ray absorption (XAS) spectrum. The rising K-edge feature at 8987.1 eV is higher energy than those of crystalline models, implying unique electronic and structural solution states. EXAFS analysis (k = 2-13 Å-1; 2 × Cu-N = 2.02 ± 0.01 Å; 2 × Cu-S = 2.27 ± 0.01 Å; Cu-Oax = 2.41 ± 0.04 Å) could not resolve 5- versus 6-coordinate models. However, MXAN fits converged to an asymmetric broken symmetry 6-coordinate model with cis-disposed TSC ligands (Cu-Oax = 2.07 and 2.54 Å; Cu-N = 1.94 Å, 1.98 Å; Cu-S = 2.20 Å, 2.41 Å). Transition dipole integral evaluation of the sulfur K-edge XAS 1s → 3p valence transition feature at 2470.7 eV yielded a Cu-S covalence of 0.66 e-, indicating Cu1.34+. The high Cu-S covalence and short Cu-S bond in aqueous [Cu(tsc)2(H2O)2]2+ again contradict the need for a protein rack to explain the unique structure of the blue copper active site. MXAN models of dissolved Cu(II) complex ions have invariably featured broken centrosymmetry. The potential energy ground state for dissolved Cu(II) evidently includes the extended solvation field, providing a target for improved physical theory. A revised solvation model for aqueous Cu(II), |[Cu(H2O)5]·14H2O|2+, is presented.
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Affiliation(s)
- Patrick Frank
- Stanford Synchrotron Radiation Lightsource, SLAC, Stanford University, Menlo Park, California 94025, United States.,Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Maurizio Benfatto
- Laboratori Nazionali di Frascati-INFN, P.O. Box 13, 00044 Frascati, Italy
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10
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Unravelling the Structure of the Tetrahedral Metal-Binding Site in METP3 through an Experimental and Computational Approach. Molecules 2021; 26:molecules26175221. [PMID: 34500655 PMCID: PMC8434281 DOI: 10.3390/molecules26175221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/25/2021] [Accepted: 08/26/2021] [Indexed: 11/17/2022] Open
Abstract
Understanding the structural determinants for metal ion coordination in metalloproteins is a fundamental issue for designing metal binding sites with predetermined geometry and activity. In order to achieve this, we report in this paper the design, synthesis and metal binding properties of METP3, a homodimer made up of a small peptide, which self assembles in the presence of tetrahedrally coordinating metal ions. METP3 was obtained through a redesign approach, starting from the previously developed METP molecule. The undecapeptide sequence of METP, which dimerizes to house a Cys4 tetrahedral binding site, was redesigned in order to accommodate a Cys2His2 site. The binding properties of METP3 were determined toward different metal ions. Successful assembly of METP3 with Co(II), Zn(II) and Cd(II), in the expected 2:1 stoichiometry and tetrahedral geometry was proven by UV-visible spectroscopy. CD measurements on both the free and metal-bound forms revealed that the metal coordination drives the peptide chain to fold into a turned conformation. Finally, NMR data of the Zn(II)-METP3 complex, together with a retrostructural analysis of the Cys-X-X-His motif in metalloproteins, allowed us to define the model structure. All the results establish the suitability of the short METP sequence for accommodating tetrahedral metal binding sites, regardless of the first coordination ligands.
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11
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Miranda-Blancas R, Avelar M, Rodriguez-Arteaga A, Sinicropi A, Rudiño-Piñera E. The β-hairpin from the Thermus thermophilus HB27 laccase works as a pH-dependent switch to regulate laccase activity. J Struct Biol 2021; 213:107740. [PMID: 33962016 DOI: 10.1016/j.jsb.2021.107740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 04/30/2021] [Accepted: 04/30/2021] [Indexed: 11/29/2022]
Abstract
The multi-copper oxidase from the hyper-thermophilic bacteria Thermus thermophilus (Tth-MCO), has been previously characterized and described as an example of a laccase with low catalytic properties, especially when it is compared with the activity of fungal laccases, but it is active at high temperatures. Structurally, Tth-MCO has a unique feature: a β-hairpin near the T1Cu site, which is not present in any other laccases deposited at the PDB. This β-hairpin has an expected crystallographic behavior in solvent-exposed areas of a crystallized protein: lack of electron density, high B-values and several crystalline contacts with neighboring crystallographic copies; however, its dynamical behavior in solution and its biological implications have not been described. Here, we describe four new Tth-MCO crystallographic structures, and the β-hairpin behavior has been analyzed by molecular dynamics simulations, considering the effect of pH and temperature. The β-hairpin new crystallographic conformations described here, together with their dynamics, were used to understand the pH-restrained laccase activity of Tth-MCO against substrates as syringaldazine. Remarkably, there are insertions in laccases from Thermus and Meiothermus genus, sharing the same position and a methionine-rich composition of the Tth-MCO β-hairpin. This unique high methionine content of the Tth-MCO β-hairpin is responsible to coordinate, Ag+1 and Hg+1 in oxidative conditions, but Cu+1 and Cu+2 are not coordinated in crystallographic experiments, regardless of the redox conditions; however, Ag+1 addition does not affect Tth-MCO laccase activity against syringaldazine. Here, we propose that the pH-dependent β-hairpin dynamical behavior could explain, at least in part, the inefficient laccase activity displayed by Tth-MCO in acidic pH values.
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Affiliation(s)
- R Miranda-Blancas
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, 2001 Universidad Av., Cuernavaca, Morelos 62210, Mexico; Instituto de Investigación en Dinámica Celular, Universidad Autónoma del Estado de Morelos, 1001 Universidad Av., Cuernavaca, Morelos 62209, Mexico
| | - M Avelar
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy
| | - A Rodriguez-Arteaga
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, 2001 Universidad Av., Cuernavaca, Morelos 62210, Mexico
| | - A Sinicropi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy; Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy; CSGI, Consorzio per lo Sviluppo dei Sistemi a Grande Interfase, 50019 Sesto Fiorentino, Italy
| | - E Rudiño-Piñera
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, 2001 Universidad Av., Cuernavaca, Morelos 62210, Mexico.
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12
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Reissmann S, Filatova MP. New generation of cell‐penetrating peptides: Functionality and potential clinical application. J Pept Sci 2021; 27:e3300. [DOI: 10.1002/psc.3300] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 01/06/2021] [Accepted: 01/11/2021] [Indexed: 12/19/2022]
Affiliation(s)
- Siegmund Reissmann
- Faculty of Biological Sciences, Institute of Biochemistry and Biophysics Friedrich Schiller University Dornburger Str. 25 Jena Thueringia 07743 Germany
| | - Margarita P. Filatova
- Shemyakin‐Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Sciences Moscow Russia
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13
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Torregrosa-Crespo J, Pire C, Richardson DJ, Martínez-Espinosa RM. Exploring the Molecular Machinery of Denitrification in Haloferax mediterranei Through Proteomics. Front Microbiol 2020; 11:605859. [PMID: 33363526 PMCID: PMC7754194 DOI: 10.3389/fmicb.2020.605859] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Accepted: 11/16/2020] [Indexed: 12/02/2022] Open
Abstract
Many proteins and enzymes involved in denitrification in haloarchaea can be inferred to be located between the cytoplasmic membrane and the S-layer, based on the presence of a Tat signal sequence and the orientation of the active site that some of these enzymes have. The membrane fraction of the haloarchaeon Haloferax mediterranei (R-4), grown under anaerobic conditions in the presence of nitrate, was solubilized to identify the respiratory proteins associated or anchored to it. Using Triton X-100, CHAPS, and n-Octyl-β-d-glucopyranoside at different concentrations we found the best conditions for isolating membrane proteins in micelles, in which enzymatic activity and stability were maintained. Then, they were subjected to purification using two chromatographic steps followed by the analysis of the eluents by NANO-ESI Chip-HPLC-MS/MS. The results showed that the four main enzymes of denitrification (nitrate, nitrite, nitric oxide, and nitrous oxide reductases) in H. mediterranei were identified and they were co-purified thanks to the micelles made with Triton X-100 (20% w/v for membrane solubilisation and 0.2% w/v in the buffers used during purification). In addition, several accessory proteins involved in electron transfer processes during anaerobic respiration as well as proteins supporting ATP synthesis, redox balancing and oxygen sensing were detected. This is the first characterization of anaerobic membrane proteome of haloarchaea under denitrifying conditions using liquid chromatography-mass spectrometry. It provides new information for a better understanding of the anaerobic respiration in haloarchaea.
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Affiliation(s)
- Javier Torregrosa-Crespo
- División de Bioquímica y Biología Molecular, Departamento de Agroquímica y Bioquímica, Facultad de Ciencias, Universidad de Alicante, Alicante, Spain
| | - Carmen Pire
- División de Bioquímica y Biología Molecular, Departamento de Agroquímica y Bioquímica, Facultad de Ciencias, Universidad de Alicante, Alicante, Spain.,Multidisciplinary Institute for Environmental Studies "Ramón Margalef", University of Alicante, Alicante, Spain
| | - David J Richardson
- School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
| | - Rosa María Martínez-Espinosa
- División de Bioquímica y Biología Molecular, Departamento de Agroquímica y Bioquímica, Facultad de Ciencias, Universidad de Alicante, Alicante, Spain.,Multidisciplinary Institute for Environmental Studies "Ramón Margalef", University of Alicante, Alicante, Spain
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14
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Jafarpour R, Fatemi F, Eidi A, Mehrnejad F. Effect of the Met148Leu mutation on the structure and dynamics of the rusticyanin protein from Acidithiobacillus sp. FJ2. J Biomol Struct Dyn 2020; 39:4122-4132. [PMID: 32462978 DOI: 10.1080/07391102.2020.1775119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The rusticyanin protein, a blue monomeric copper protein type-1, is one of the main components in the iron-electron transfer chain of the Acidithiobacillus ferrooxidans, and is the product of the rus gene expression. Herein, first the bacterial DNA of Acidithiobacillus sp. FJ2 was extracted. Then, the rus gene sequence and the sequence amino acid rusticyanin protein were determined. The Met148Leu mutation increased the oxidase activity of the rusticyanin protein, thereby enhancing the efficiency of the bioleaching process by bacteria Acidithiobacillus ferroxidans. Met148Leu mutation was created in the rusticyanin protein, then molecular dynamics (MD) simulations and structural analysis were performed. The MD analysis of the wild-type and mutant protein demonstrated a slight instability in the mutant protein and significant instability in the active site of the mutant protein. The usefulness of this study is the genetic manipulation of the native Acidithiobacillus sp. FJ2 bacterium, which can boost the bioleaching efficiency of the bacterium to some extent, and investigating its effects on the structure of a mutant protein using computational methods.
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Affiliation(s)
- Roghayeh Jafarpour
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Faezeh Fatemi
- Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
| | - Akram Eidi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Faramarz Mehrnejad
- Department of Life Sciences Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
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15
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Zitare UA, Szuster J, Santalla MC, Morgada MN, Vila AJ, Murgida DH. Dynamical effects in metalloprotein heterogeneous electron transfer. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136095] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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16
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Santos G, Borges JMP, Avila-Rodriguez M, Gaíno SB, Barreto GE, Rúbio ÉP, Aguiar RM, Galembeck E, Bromochenkel CB, de Oliveira DM. Copper and Neurotoxicity in Autism Spectrum Disorder. Curr Pharm Des 2019; 25:4747-4754. [PMID: 31845627 DOI: 10.2174/1381612825666191217091939] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 12/08/2019] [Indexed: 12/23/2022]
Abstract
Free radicals (FR) act on living organisms and present unpaired electrons in the molecular orbitals of oxygen or nitrogen species. They are classified as redox reactions and account for a wide range of processes in biological systems. Genetic and environmental factors may alter the levels of FR in the cell, leading to deleterious consequences such as membrane lipid peroxidation, protein nitration, enzyme, carbohydrate and DNA damage, ultimately resulting in premature aging and a pro-inflammatory microenvironment as observed in Alzheimer's disease (AD) and autism spectrum disorder (ASD). O2 radical ability to act as a Lewis base and to form a complex with metal transition such as iron and copper (Lewis acids) leads to biomolecules oxidation at physiological pH, thus increasing the possibility of injury and oxidative damage in biological tissues. In this review, we discuss the role of metals, like copper, and the amyloid precursor protein (APP) derivative (s-APP-alpha) as an antioxidant and a possible adjuvant in the treatment of some autistic spectrum disorder symptoms (ASD).
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Affiliation(s)
- Gesivaldo Santos
- Department of Biological Science, State University of Southwestern of Bahia, Bahia, Brazil
| | - Julita M P Borges
- Department of Science and Technology, State University of Southwestern of Bahia, Bahia, Brazil
| | | | | | - George E Barreto
- Department of Biological Sciences, University of Limerick, Limerick, Ireland
| | - Érika P Rúbio
- Department of Science and Technology, State University of Southwestern of Bahia, Bahia, Brazil
| | - Rosane M Aguiar
- Department of Science and Technology, State University of Southwestern of Bahia, Bahia, Brazil
| | - Eduardo Galembeck
- Institute of Biology, State University of Campinas-São Paulo, São Paulo, Brazil
| | | | - Djalma M de Oliveira
- Department of Science and Technology, State University of Southwestern of Bahia, Bahia, Brazil
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17
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An M, Zhou T, Guo Y, Zhao X, Wu Y. Molecular Regulation of Host Defense Responses Mediated by Biological Anti-TMV Agent Ningnanmycin. Viruses 2019; 11:E815. [PMID: 31484426 PMCID: PMC6784071 DOI: 10.3390/v11090815] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 08/30/2019] [Accepted: 08/31/2019] [Indexed: 12/28/2022] Open
Abstract
Ningnanmycin (NNM) belongs to microbial pesticides that display comprehensive antiviral activity against plant viruses. NNM treatment has been shown to efficiently delay or suppress the disease symptoms caused by tobacco mosaic virus (TMV) infection in local-inoculated or systemic-uninoculated tobacco leaves, respectively. However, the underlying molecular mechanism of NNM-mediated antiviral activity remains to be further elucidated. In this study, 414 differentially expressed genes (DEGs), including 383 which were up-regulated and 31 down-regulated, caused by NNM treatment in TMV-infected BY-2 protoplasts, were discovered by RNA-seq. In addition, KEGG analysis indicated significant enrichment of DEGs in the plant-pathogen interaction and MAPK signaling pathway. The up-regulated expression of crucial DEGs, including defense-responsive genes, such as the receptor-like kinase FLS2, RLK1, and the mitogen-activated protein kinase kinase kinase MAPKKK, calcium signaling genes, such as the calcium-binding protein CML19, as well as phytohormone responsive genes, such as the WRKY transcription factors WRKY40 and WRKY70, were confirmed by RT-qPCR. These findings provided valuable insights into the antiviral mechanisms of NNM, which indicated that the agent induces tobacco systemic resistance against TMV via activating multiple plant defense signaling pathways.
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Affiliation(s)
- Mengnan An
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Tao Zhou
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Yi Guo
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Xiuxiang Zhao
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, China.
| | - Yuanhua Wu
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, China.
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18
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Opperman DJ, Murgida DH, Dalosto SD, Brondino CD, Ferroni FM. A three-domain copper-nitrite reductase with a unique sensing loop. IUCRJ 2019; 6:248-258. [PMID: 30867922 PMCID: PMC6400189 DOI: 10.1107/s2052252519000241] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 01/06/2019] [Indexed: 06/09/2023]
Abstract
Dissimilatory nitrite reductases are key enzymes in the denitrification pathway, reducing nitrite and leading to the production of gaseous products (NO, N2O and N2). The reaction is catalysed either by a Cu-containing nitrite reductase (NirK) or by a cytochrome cd 1 nitrite reductase (NirS), as the simultaneous presence of the two enzymes has never been detected in the same microorganism. The thermophilic bacterium Thermus scotoductus SA-01 is an exception to this rule, harbouring both genes within a denitrification cluster, which encodes for an atypical NirK. The crystal structure of TsNirK has been determined at 1.63 Å resolution. TsNirK is a homotrimer with subunits of 451 residues that contain three copper atoms each. The N-terminal region possesses a type 2 Cu (T2Cu) and a type 1 Cu (T1CuN) while the C-terminus contains an extra type 1 Cu (T1CuC) bound within a cupredoxin motif. T1CuN shows an unusual Cu atom coordination (His2-Cys-Gln) compared with T1Cu observed in NirKs reported so far (His2-Cys-Met). T1CuC is buried at ∼5 Å from the molecular surface and located ∼14.1 Å away from T1CuN; T1CuN and T2Cu are ∼12.6 Å apart. All these distances are compatible with an electron-transfer process T1CuC → T1CuN → T2Cu. T1CuN and T2Cu are connected by a typical Cys-His bridge and an unexpected sensing loop which harbours a SerCAT residue close to T2Cu, suggesting an alternative nitrite-reduction mechanism in these enzymes. Biophysicochemical and functional features of TsNirK are discussed on the basis of X-ray crystallography, electron paramagnetic resonance, resonance Raman and kinetic experiments.
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Affiliation(s)
- Diederik Johannes Opperman
- Department of Biotechnology, University of the Free State, 205 Nelson Mandela Drive, Bloemfontein, Free State 9300, South Africa
| | - Daniel Horacio Murgida
- Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. 2 piso 1, Buenos Aires, Buenos Aires C1428EHA, Argentina
| | - Sergio Daniel Dalosto
- Instituto de Física del Litoral, CONICET-UNL, Güemes 3450, Santa Fe, Santa Fe S3000ZAA, Argentina
| | - Carlos Dante Brondino
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral (UNL), CONICET, Ciudad Universitaria, Paraje El Pozo, Santa Fe, Santa Fe S3000ZAA, Argentina
| | - Felix Martín Ferroni
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral (UNL), CONICET, Ciudad Universitaria, Paraje El Pozo, Santa Fe, Santa Fe S3000ZAA, Argentina
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The role of molecular crowding in long-range metalloprotein electron transfer: Dissection into site- and scaffold-specific contributions. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.10.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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20
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Zhu W, Gao E, Shaban M, Wang Y, Wang H, Nie X, Zhu L. GhUMC1, a blue copper-binding protein, regulates lignin synthesis and cotton immune response. Biochem Biophys Res Commun 2018; 504:75-81. [DOI: 10.1016/j.bbrc.2018.08.128] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 08/21/2018] [Indexed: 02/07/2023]
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21
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Segoviano-Garfias JJ, Nájera-Lara M, Pérez-Arredondo MDLL, López-Ramírez V, Rubio-Jimenez C, Ramírez-Vázquez JA, Moreno-Esparza R. Spectrophotometric determination of formation constants of copper(II) complexes with 2,2′-bipyridyl, 1,10-phenanthroline and their halides in methanol. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.112] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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22
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Soldatova AV, Tao L, Romano CA, Stich TA, Casey WH, Britt RD, Tebo BM, Spiro TG. Mn(II) Oxidation by the Multicopper Oxidase Complex Mnx: A Binuclear Activation Mechanism. J Am Chem Soc 2017; 139:11369-11380. [PMID: 28712284 DOI: 10.1021/jacs.7b02771] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The bacterial protein complex Mnx contains a multicopper oxidase (MCO) MnxG that, unusually, catalyzes the two-electron oxidation of Mn(II) to MnO2 biomineral, via a Mn(III) intermediate. Although Mn(III)/Mn(II) and Mn(IV)/Mn(III) reduction potentials are expected to be high, we find a low reduction potential, 0.38 V (vs Normal Hydrogen Electrode, pH 7.8), for the MnxG type 1 Cu2+, the electron acceptor. Indeed the type 1 Cu2+ is not reduced by Mn(II) in the absence of molecular oxygen, indicating that substrate oxidation requires an activation step. We have investigated the enzyme mechanism via electronic absorption spectroscopy, using chemometric analysis to separate enzyme-catalyzed MnO2 formation from MnO2 nanoparticle aging. The nanoparticle aging time course is characteristic of nucleation and particle growth; rates for these processes followed expected dependencies on Mn(II) concentration and temperature, but exhibited different pH optima. The enzymatic time course is sigmoidal, signaling an activation step, prior to turnover. The Mn(II) concentration and pH dependence of a preceding lag phase indicates weak Mn(II) binding. The activation step is enabled by a pKa > 8.6 deprotonation, which is assigned to Mn(II)-bound H2O; it induces a conformation change (consistent with a high activation energy, 106 kJ/mol) that increases Mn(II) affinity. Mnx activation is proposed to decrease the Mn(III/II) reduction potential below that of type 1 Cu(II/I) by formation of a hydroxide-bridged binuclear complex, Mn(II)(μ-OH)Mn(II), at the substrate site. Turnover is found to depend cooperatively on two Mn(II) and is enabled by a pKa 7.6 double deprotonation. It is proposed that turnover produces a Mn(III)(μ-OH)2Mn(III) intermediate that proceeds to the enzyme product, likely Mn(IV)(μ-O)2Mn(IV) or an oligomer, which subsequently nucleates MnO2 nanoparticles. We conclude that Mnx exploits manganese polynuclear chemistry in order to facilitate an otherwise difficult oxidation reaction, as well as biomineralization. The mechanism of the Mn(III/IV) conversion step is elucidated in an accompanying paper .
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Affiliation(s)
- Alexandra V Soldatova
- Department of Chemistry, University of Washington , Box 351700, Seattle, Washington 98195, United States
| | | | - Christine A Romano
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University , Portland, Oregon 97239, United States
| | | | | | | | - Bradley M Tebo
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University , Portland, Oregon 97239, United States
| | - Thomas G Spiro
- Department of Chemistry, University of Washington , Box 351700, Seattle, Washington 98195, United States
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Roger M, Sciara G, Biaso F, Lojou E, Wang X, Bauzan M, Giudici-Orticoni MT, Vila AJ, Ilbert M. Impact of copper ligand mutations on a cupredoxin with a green copper center. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:351-359. [DOI: 10.1016/j.bbabio.2017.02.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/10/2017] [Accepted: 02/14/2017] [Indexed: 11/26/2022]
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