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Kim J, Park S, Go YK, Jin K, Kim Y, Nam KT, Kim SH. Probing the Structure and Binding Mode of EDTA on the Surface of Mn 3O 4 Nanoparticles for Water Oxidation by Advanced Electron Paramagnetic Resonance Spectroscopy. Inorg Chem 2020; 59:8846-8854. [PMID: 32501692 DOI: 10.1021/acs.inorgchem.0c00611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Identification of the surface structure of nanoparticles is important for understanding the catalytic mechanism and improving the properties of the particles. Here, we provide a detailed description of the coordination modes of ethylenediaminetetraacetate (EDTA) on Mn3O4 nanoparticles at the atomic level, as obtained by advanced electron paramagnetic resonance (EPR) spectroscopy. Binding of EDTA to Mn3O4 leads to dramatic changes in the EPR spectrum, with a 5-fold increase in the axial zero-field splitting parameter of Mn(II). This indicates significant changes in the coordination environment of the Mn(II) site; hence, the binding of EDTA causes a profound change in the electronic structure of the manganese site. Furthermore, the electron spin echo envelope modulation results reveal that two 14N atoms of EDTA are directly coordinated to the Mn site and a water molecule is coordinated to the surface of the nanoparticles. An Fourier transform infrared spectroscopy study shows that the Ca(II) ion is coordinated to the carboxylic ligands via the pseudobridging mode. The EPR spectroscopic results provide an atomic picture of surface-modified Mn3O4 nanoparticles for the first time. These results can enhance our understanding of the rational design of catalysts, for example, for the water oxidation reaction.
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Affiliation(s)
- Jin Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI), Seoul 03759, Republic of Korea
| | - Sunghak Park
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Yoo Kyung Go
- Western Seoul Center, Korea Basic Science Institute (KBSI), Seoul 03759, Republic of Korea
| | - Kyoungsuk Jin
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Yujeong Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI), Seoul 03759, Republic of Korea.,Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI), Seoul 03759, Republic of Korea.,Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea
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Sardar S, Weitz A, Hendrich MP, Pierce BS. Outer-Sphere Tyrosine 159 within the 3-Mercaptopropionic Acid Dioxygenase S-H-Y Motif Gates Substrate-Coordination Denticity at the Non-Heme Iron Active Site. Biochemistry 2019; 58:5135-5150. [PMID: 31750652 PMCID: PMC10071547 DOI: 10.1021/acs.biochem.9b00674] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Thiol dioxygenases are non-heme mononuclear iron enzymes that catalyze the O2-dependent oxidation of free thiols (-SH) to produce the corresponding sulfinic acid (-SO2-). Regardless of the phylogenic domain, the active site for this enzyme class is typically comprised of two major features: (1) a mononuclear ferrous iron coordinated by three protein-derived histidines and (2) a conserved sequence of outer Fe-coordination-sphere amino acids (Ser-His-Tyr) spatially adjacent to the iron site (∼3 Å). Here, we utilize a promiscuous 3-mercaptopropionic acid dioxygenase cloned from Azotobacter vinelandii (Av MDO) to explore the function of the conserved S-H-Y motif. This enzyme exhibits activity with 3-mercaptopropionic acid (3mpa), l-cysteine (cys), as well as several other thiol-bearing substrates, thus making it an ideal system to study the influence of residues within the highly conserved S-H-Y motif (H157 and Y159) on substrate specificity and reactivity. The pKa values for these residues were determined by pH-dependent steady-state kinetics, and their assignments verified by comparison to H157N and Y159F variants. Complementary electron paramagnetic resonance and Mössbauer studies demonstrate a network of hydrogen bonds connecting H157-Y159 and Fe-bound ligands within the enzymatic Fe site. Crucially, these experiments suggest that the hydroxyl group of Y159 hydrogen bonds to Fe-bound NO and, by extension, Fe-bound oxygen during native catalysis. This interaction alters both the NO binding affinity and rhombicity of the 3mpa-bound iron-nitrosyl site. In addition, Fe coordination of cys is switched from thiolate only to bidentate (thiolate/amine) for the Y159F variant, indicating that perturbations within the S-H-Y proton relay network also influence cys Fe binding denticity.
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Affiliation(s)
- Sinjinee Sardar
- Department of Chemistry and Biochemistry , The University of Texas at Arlington , 700 Planetarium Place , Arlington , Texas 76019 , United States
| | - Andrew Weitz
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Avenue , Pittsburgh , Pennsylvania 15213 , United States
| | - Michael P Hendrich
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Avenue , Pittsburgh , Pennsylvania 15213 , United States
| | - Brad S Pierce
- Department of Chemistry and Biochemistry , University of Alabama , 250 Hackberry Lane , Tuscaloosa , Alabama 35487 , United States
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Lingappa UF, Monteverde DR, Magyar JS, Valentine JS, Fischer WW. How manganese empowered life with dioxygen (and vice versa). Free Radic Biol Med 2019; 140:113-125. [PMID: 30738765 DOI: 10.1016/j.freeradbiomed.2019.01.036] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 01/25/2019] [Indexed: 01/02/2023]
Abstract
Throughout the history of life on Earth, abiotic components of the environment have shaped the evolution of life, and in turn life has shaped the environment. The element manganese embodies a special aspect of this collaboration; its history is closely entwined with those of photosynthesis and O2-two reigning features that characterize the biosphere today. Manganese chemistry was central to the environmental context and evolutionary innovations that enabled the origin of oxygenic photosynthesis and the ensuing rise of O2. It was also manganese chemistry that provided an early, fortuitous antioxidant system that was instrumental in how life came to cope with oxidative stress and ultimately thrive in an aerobic world. Subsequently, the presence of O2 transformed the biogeochemical dynamics of the manganese cycle, enabling a rich suite of environmental and biological processes involving high-valent manganese and manganese redox cycling. Here, we describe insights from chemistry, biology, and geology, to examine manganese dynamics in the environment, and its unique role in the history of life.
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Affiliation(s)
- Usha F Lingappa
- Div. of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, USA.
| | - Danielle R Monteverde
- Div. of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, USA
| | - John S Magyar
- Div. of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Joan Selverstone Valentine
- Div. of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, USA; Dept. of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, CA, 90095, USA
| | - Woodward W Fischer
- Div. of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, USA
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Twahir UT, Ozarowski A, Angerhofer A. Redox Cycling, pH Dependence, and Ligand Effects of Mn(III) in Oxalate Decarboxylase from Bacillus subtilis. Biochemistry 2016; 55:6505-6516. [DOI: 10.1021/acs.biochem.6b00891] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Umar T. Twahir
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Alexander Angerhofer
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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Thermodynamics of substrate binding to the metal site in homoprotocatechuate 2,3-dioxygenase: Using ITC under anaerobic conditions to study enzyme–substrate interactions. Biochim Biophys Acta Gen Subj 2016; 1860:910-916. [DOI: 10.1016/j.bbagen.2015.07.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/17/2015] [Accepted: 07/24/2015] [Indexed: 11/24/2022]
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Tao L, Stich TA, Butterfield CN, Romano CA, Spiro TG, Tebo BM, Casey WH, Britt RD. Mn(II) Binding and Subsequent Oxidation by the Multicopper Oxidase MnxG Investigated by Electron Paramagnetic Resonance Spectroscopy. J Am Chem Soc 2015; 137:10563-75. [DOI: 10.1021/jacs.5b04331] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | | | - Cristina N. Butterfield
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
| | - Christine A. Romano
- 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
| | - Bradley M. Tebo
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
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