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Fedoretz-Maxwell BP, Shin CH, MacNeil GA, Worrall LJ, Park R, Strynadka NCJ, Walsby CJ, Warren JJ. The Impact of Second Coordination Sphere Methionine-Aromatic Interactions in Copper Proteins. Inorg Chem 2022; 61:5563-5571. [DOI: 10.1021/acs.inorgchem.2c00030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Brooklyn P. Fedoretz-Maxwell
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Catherine H. Shin
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Gregory A. MacNeil
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Liam J. Worrall
- Department of Biochemistry and Molecular Biology and Centre for Blood Research, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Rachel Park
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Natalie C. J. Strynadka
- Department of Biochemistry and Molecular Biology and Centre for Blood Research, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Charles J. Walsby
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Jeffrey J. Warren
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
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Gibbs CA, Fedoretz-Maxwell BP, Warren JJ. On the roles of methionine and the importance of its microenvironments in redox metalloproteins. Dalton Trans 2022; 51:4976-4985. [PMID: 35253809 DOI: 10.1039/d1dt04387k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The amino acid residue methionine (Met) is commonly thought of as a ligand in redox metalloproteins, for example in cytochromes c and in blue copper proteins. However, the roles of Met can go beyond a simple ligand. The thioether functional group of Met allows it to be considered as a hydrophobic residue as well as one that is capable of weak dipolar interactions. In addition, the lone pairs on sulphur allow Met to interact with other groups, inluding the aforementioned metal ions. Because of its properties, Met can play diverse roles in metal coordination, fine tuning of redox reactions, or supporting protein structures. These roles are strongly influenced by the nature of the surrounding medium. Herein, we describe several common interactions between Met and surrounding aromatic amino acids and how they affect the physical properties of both copper and iron metalloproteins. While the importance of interactions between Met and other groups is established in biological systems, less is known about their roles in redox metalloproteins and our view is that this is an area that is ready for greater attention.
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Affiliation(s)
- Curtis A Gibbs
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby BC V5A 1S6, Canada.
| | | | - Jeffrey J Warren
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby BC V5A 1S6, Canada.
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Vilbert AC, Liu Y, Dai H, Lu Y. Recent advances in tuning redox properties of electron transfer centers in metalloenzymes catalyzing oxygen reduction reaction and H 2 oxidation important for fuel cells design. CURRENT OPINION IN ELECTROCHEMISTRY 2021; 30:100780. [PMID: 34435160 PMCID: PMC8382256 DOI: 10.1016/j.coelec.2021.100780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Current fuel-cell catalysts for oxygen reduction reaction (ORR) and H2 oxidation use precious metals and, for ORR, require high overpotentials. In contrast, metalloenzymes perform their respective reaction at low overpotentials using earth-abundant metals, making metalloenzymes ideal candidates for inspiring electrocatalytic design. Critical to the success of these enzymes are redox-active metal centers surrounding the enzyme active sites that ensure fast electron transfer (ET) to or away from the active site, by tuning the catalytic potential of the reaction as observed in multicopper oxidases but also in dictating the catalytic bias of the reaction as realized in hydrogenases. This review summarizes recent advances in studying these ET centers in multicopper oxidases and heme-copper oxidases that perform ORR and hydrogenases in carrying out H2 oxidation. Insights gained from understanding how the reduction potential of the ET centers effects reactivity at the active site in both the enzymes and their models are provided.
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Affiliation(s)
| | - Yiwei Liu
- Department of Chemistry and Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Huiguang Dai
- Department of Chemistry and Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yi Lu
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
- Department of Chemistry and Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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Affiliation(s)
- Kyle M. Lancaster
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA
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Sinicropi A. DFT modeling of structures and redox potentials of wild-type, Nickel-substituted and mutated (N47S/M121L, HPAz) Azurin. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.08.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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McQuarters AB, Speelman AL, Chen L, Elmore BO, Fan W, Feng C, Lehnert N. Exploring second coordination sphere effects in nitric oxide synthase. J Biol Inorg Chem 2016; 21:997-1008. [PMID: 27686338 DOI: 10.1007/s00775-016-1396-1] [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] [Received: 08/17/2016] [Accepted: 09/15/2016] [Indexed: 11/28/2022]
Abstract
Second coordination sphere (SCS) effects in proteins are modulated by active site residues and include hydrogen bonding, electrostatic/dipole interactions, steric interactions, and π-stacking of aromatic residues. In Cyt P450s, extended H-bonding networks are located around the proximal cysteinate ligand of the heme, referred to as the 'Cys pocket'. These hydrogen bonding networks are generally believed to regulate the Fe-S interaction. Previous work identified the S(Cys) → Fe σ CT transition in the high-spin (hs) ferric form of Cyt P450cam and corresponding Cys pocket mutants by low-temperature (LT) MCD spectroscopy [Biochemistry 50:1053, 2011]. In this work, we have investigated the effect of the hydrogen bond from W409 to the axial Cys ligand of the heme in the hs ferric state (with H4B and L-Arg bound) of rat neuronal nitric oxide synthase oxygenase construct (nNOSoxy) using MCD spectroscopy. For this purpose, wt enzyme and W409 mutants were investigated where the H-bonding network with the axial Cys ligand is perturbed. Overall, the results are similar to Cyt P450cam and show the intense S(Cys) → Fe σ CT band in the LT MCD spectrum at about 27,800 cm-1, indicating that this feature is a hallmark of {heme-thiolate} active sites. The discovery of this MCD feature could constitute a new approach to classify {heme-thiolate} sites in hs ferric proteins. Finally, the W409 mutants show that the hydrogen bond from this group only has a small effect on the Fe-S(Cys) bond strength, at least in the hs ferric form of the protein studied here. Low-temperature MCD spectroscopy is used to investigate the effect of the hydrogen bond from W409 to the axial Cys ligand of the heme in neuronal nitric oxide synthase. The intense S(Cys) → Fe σ-CT band is monitored to identify changes in the Fe-S(Cys) bond in wild-type protein and W409 mutants.
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Affiliation(s)
- Ashley B McQuarters
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Biophysics, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Amy L Speelman
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Biophysics, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Li Chen
- College of Pharmacy, University of New Mexico, Albuquerque, NM, 87131, USA
| | - Bradley O Elmore
- College of Pharmacy, University of New Mexico, Albuquerque, NM, 87131, USA
| | - Weihong Fan
- College of Pharmacy, University of New Mexico, Albuquerque, NM, 87131, USA
| | - Changjian Feng
- College of Pharmacy, University of New Mexico, Albuquerque, NM, 87131, USA
| | - Nicolai Lehnert
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA. .,Department of Biophysics, University of Michigan, Ann Arbor, MI, 48109, USA.
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Moore CM, Bark B, Szymczak NK. Simple Ligand Modifications with Pendent OH Groups Dramatically Impact the Activity and Selectivity of Ruthenium Catalysts for Transfer Hydrogenation: The Importance of Alkali Metals. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00229] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cameron M. Moore
- Department of Chemistry, University of Michigan, 930 North University, Ann
Arbor, Michigan 48109, United States
| | - Byongjoo Bark
- Department of Chemistry, University of Michigan, 930 North University, Ann
Arbor, Michigan 48109, United States
| | - Nathaniel K. Szymczak
- Department of Chemistry, University of Michigan, 930 North University, Ann
Arbor, Michigan 48109, United States
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Stevens CJ, Prescimone A, Tuna F, McInnes EJL, Parsons S, Morrison CA, Arnold PL, Love JB. Inter- versus Intramolecular Structural Manipulation of a Dichromium(II) Pacman Complex through Pressure Variation. Inorg Chem 2016; 55:214-20. [PMID: 26683991 DOI: 10.1021/acs.inorgchem.5b02151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effect of pressure on the intranuclear M···M separation and intermolecular secondary interactions in the dinuclear chromium Pacman complex [Cr2(L)](C6H6) was evaluated because this compound contains both a short Cr···Cr separation and an exogenously bound molecule of benzene in the solid state. The electronic structure of [Cr2(L)] was determined by electron paramagnetic resonance spectroscopy, SQUID magnetometry, and density functional theory calculations and shows a diamagnetic ground state through antiferromagnetic exchange, with no evidence for a Cr-Cr bond. Analysis of the solid-state structures of [Cr2(L)](C6H6) at pressures varying from ambient to 3.0 GPa shows little deformation in the Cr···Cr separation, i.e., no Cr-Cr bond formation, but instead a significantly increased interaction between the exogenous arene and the chromium iminopyrrolide environment. It is therefore apparent from this analysis that [Cr2(L)] would be best exploited as a rigid chemical synthon, with pressure regulation being used to mediate the approach and secondary interactions of possible substrates.
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Affiliation(s)
- Charlotte J Stevens
- EaStCHEM School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Alessandro Prescimone
- EaStCHEM School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Floriana Tuna
- EPSRC National EPR Facility, School of Chemistry and Photon Science Institute, University of Manchester , Oxford Road, Manchester M13 9PL, U.K
| | - Eric J L McInnes
- EPSRC National EPR Facility, School of Chemistry and Photon Science Institute, University of Manchester , Oxford Road, Manchester M13 9PL, U.K
| | - Simon Parsons
- EaStCHEM School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Carole A Morrison
- EaStCHEM School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Jason B Love
- EaStCHEM School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K
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Moore CM, Szymczak NK. Nitrite reduction by copper through ligand-mediated proton and electron transfer. Chem Sci 2015; 6:3373-3377. [PMID: 28706701 PMCID: PMC5490426 DOI: 10.1039/c5sc00720h] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 04/02/2015] [Indexed: 11/25/2022] Open
Abstract
Nitrite reduction by a copper complex featuring a proton-responsive tripodal ligand is demonstrated. Gaseous nitric oxide was confirmed as the sole NO X by-product in quantitative yield. DFT calculations predict that nitrite reduction occurs via a proton and electron transfer process mediated by the ligand. The reported mechanism parallels nitrite reduction by copper nitrite reductase.
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Affiliation(s)
- Cameron M Moore
- Department of Chemistry , University of Michigan , 930 N. University Ave. , Ann Arbor , MI 48109 , USA .
| | - Nathaniel K Szymczak
- Department of Chemistry , University of Michigan , 930 N. University Ave. , Ann Arbor , MI 48109 , USA .
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Morgada MN, Abriata LA, Zitare U, Alvarez-Paggi D, Murgida DH, Vila AJ. Control of the Electronic Ground State on an Electron-Transfer Copper Site by Second-Sphere Perturbations. Angew Chem Int Ed Engl 2014; 53:6188-92. [DOI: 10.1002/anie.201402083] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 02/24/2014] [Indexed: 01/07/2023]
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Morgada MN, Abriata LA, Zitare U, Alvarez-Paggi D, Murgida DH, Vila AJ. Control of the Electronic Ground State on an Electron-Transfer Copper Site by Second-Sphere Perturbations. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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13
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Warren JJ, Lancaster KM, Richards JH, Gray HB. Inner- and outer-sphere metal coordination in blue copper proteins. J Inorg Biochem 2012; 115:119-26. [PMID: 22658756 PMCID: PMC3434318 DOI: 10.1016/j.jinorgbio.2012.05.002] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2012] [Revised: 04/30/2012] [Accepted: 05/01/2012] [Indexed: 10/28/2022]
Abstract
Blue copper proteins (BCPs) comprise classic cases of Nature's profound control over the electronic structures and chemical reactivity of transition metal ions. Early studies of BCPs focused on their inner coordination spheres, that is, residues that directly coordinate Cu. Equally important are the electronic and geometric perturbations to these ligands provided by the outer coordination sphere. In this tribute to Hans Freeman, we review investigations that have advanced the understanding of how inner-sphere and outer-sphere coordination affects biological Cu properties.
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Affiliation(s)
- Jeffrey J Warren
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA
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