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Mammoser CC, LeMasters BE, Edwards SG, McRae EM, Mullins MH, Wang Y, Garcia NM, Edmonds KA, Giedroc DP, Thielges MC. The structure of plastocyanin tunes the midpoint potential by restricting axial ligation of the reduced copper ion. Commun Chem 2023; 6:175. [PMID: 37612467 PMCID: PMC10447441 DOI: 10.1038/s42004-023-00977-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 08/07/2023] [Indexed: 08/25/2023] Open
Abstract
Blue copper proteins are models for illustrating how proteins tune metal properties. Nevertheless, the mechanisms by which the protein controls the metal site remain to be fully elucidated. A hindrance is that the closed shell Cu(I) site is inaccessible to most spectroscopic analyses. Carbon deuterium (C-D) bonds used as vibrational probes afford nonperturbative, selective characterization of the key cysteine and methionine copper ligands in both redox states. The structural integrity of Nostoc plastocyanin was perturbed by disrupting potential hydrogen bonds between loops of the cupredoxin fold via mutagenesis (S9A, N33A, N34A), variably raising the midpoint potential. The C-D vibrations show little change to suggest substantial alteration to the Cu(II) coordination in the oxidized state or in the Cu(I) interaction with the cysteine ligand. They rather indicate, along with visible and NMR spectroscopy, that the methionine ligand distinctly interacts more strongly with the Cu(I) ion, in line with the increases in midpoint potential. Here we show that the protein structure determines the redox properties by restricting the interaction between the methionine ligand and Cu(I) in the reduced state.
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Affiliation(s)
- Claire C Mammoser
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Brynn E LeMasters
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
- Department of Chemistry, University of Wisconsin, Madison, WI, 53706, USA
| | - Sydney G Edwards
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Emma M McRae
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - M Hunter Mullins
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
- Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Yiqi Wang
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Nicholas M Garcia
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
- University of Wisconsin School of Medicine and Public Health, Madison, WI, 53726, USA
| | - Katherine A Edmonds
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - David P Giedroc
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Megan C Thielges
- Indiana University Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA.
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2
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Olloqui-Sariego JL, Díaz-Quintana A, De la Rosa MÁ, Calvente JJ, Márquez I, Díaz-Moreno I, Andreu R. Protein crosslinking improves the thermal resistance of plastocyanin immobilized on a modified gold electrode. Bioelectrochemistry 2018; 124:127-132. [DOI: 10.1016/j.bioelechem.2018.07.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 07/13/2018] [Accepted: 07/13/2018] [Indexed: 10/28/2022]
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3
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Olloqui-Sariego JL, Márquez I, Frutos-Beltrán E, Díaz-Moreno I, De la Rosa MA, Calvente JJ, Andreu R, Díaz-Quintana A. Key Role of the Local Hydrophobicity in the East Patch of Plastocyanins on Their Thermal Stability and Redox Properties. ACS OMEGA 2018; 3:11447-11454. [PMID: 31459248 PMCID: PMC6645426 DOI: 10.1021/acsomega.8b01612] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 09/06/2018] [Indexed: 06/10/2023]
Abstract
Understanding the molecular basis of the thermal stability and functionality of redox proteins has important practical applications. Here, we show a distinct thermal dependence of the spectroscopic and electrochemical properties of two plastocyanins from the thermophilic cyanobacterium Phormidium laminosum and their mesophilic counterpart from Synechocystis sp. PCC 6803, despite the similarity of their molecular structures. To explore the origin of these differences, we have mimicked the local hydrophobicity in the east patch of the thermophilic protein by replacing a valine of the mesophilic plastocyanin by isoleucine. Interestingly, the resulting mutant approaches the thermal stability, redox thermodynamics, and dynamic coupling of the flexible site motions of the thermophilic protein, indicating the existence of a close connection between the hydrophobic packing of the east patch region of plastocyanin and the functional control and stability of the oxidized and reduced forms of the protein.
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Affiliation(s)
- José Luis Olloqui-Sariego
- Departamento
de Química Física, Universidad
de Sevilla, c/ Profesor García González, 1, 41012 Sevilla, Spain
| | - Inmaculada Márquez
- Departamento
de Química Física, Universidad
de Sevilla, c/ Profesor García González, 1, 41012 Sevilla, Spain
| | - Estrella Frutos-Beltrán
- Instituto
de Investigaciones Químicas, cicCartuja, Universidad de Sevilla y CSIC, Avd. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Irene Díaz-Moreno
- Instituto
de Investigaciones Químicas, cicCartuja, Universidad de Sevilla y CSIC, Avd. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Miguel A. De la Rosa
- Instituto
de Investigaciones Químicas, cicCartuja, Universidad de Sevilla y CSIC, Avd. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Juan José Calvente
- Departamento
de Química Física, Universidad
de Sevilla, c/ Profesor García González, 1, 41012 Sevilla, Spain
| | - Rafael Andreu
- Departamento
de Química Física, Universidad
de Sevilla, c/ Profesor García González, 1, 41012 Sevilla, Spain
| | - Antonio Díaz-Quintana
- Instituto
de Investigaciones Químicas, cicCartuja, Universidad de Sevilla y CSIC, Avd. Américo Vespucio 49, 41092 Sevilla, Spain
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4
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Olloqui-Sariego JL, Moreno-Beltrán B, Díaz-Quintana A, De la Rosa MA, Calvente JJ, Andreu R. Temperature-Driven Changeover in the Electron-Transfer Mechanism of a Thermophilic Plastocyanin. J Phys Chem Lett 2014; 5:910-914. [PMID: 26274087 DOI: 10.1021/jz500150y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Electron-transfer kinetics of the thermophilic protein Plastocyanin from Phormidium laminosum adsorbed on 1,ω-alkanedithiol self-assembled monolayers (SAMs) deposited on gold have been investigated. The standard electron-transfer rate constant has been determined as a function of electrode-protein distance and solution viscosity over a broad temperature range (0-90 °C). For either thin or thick SAMs, the electron-transfer regime remains invariant with temperature, whereas for the 1,11-undecanethiol SAM of intermediate chain length, a kinetic regime changeover from a gated or friction-controlled mechanism at low temperature (0-30 °C) to a nonadiabatic mechanism above 40 °C is observed. To the best of our knowledge, this is the first time a thermal-induced transition between these two kinetic regimes is reported for a metalloprotein.
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Affiliation(s)
- José Luis Olloqui-Sariego
- †Departamento de Quı́mica Fı́sica, Universidad de Sevilla, c/Profesor Garcı́a González, 1, 41012 Sevilla, Spain
| | - Blas Moreno-Beltrán
- ‡Instituto de Bioquı́mica Vegetal y Fotosı́ntesis, cicCartuja, Universidad de Sevilla y C.S.I.C, Avd. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Antonio Díaz-Quintana
- ‡Instituto de Bioquı́mica Vegetal y Fotosı́ntesis, cicCartuja, Universidad de Sevilla y C.S.I.C, Avd. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Miguel A De la Rosa
- ‡Instituto de Bioquı́mica Vegetal y Fotosı́ntesis, cicCartuja, Universidad de Sevilla y C.S.I.C, Avd. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Juan José Calvente
- †Departamento de Quı́mica Fı́sica, Universidad de Sevilla, c/Profesor Garcı́a González, 1, 41012 Sevilla, Spain
| | - Rafael Andreu
- †Departamento de Quı́mica Fı́sica, Universidad de Sevilla, c/Profesor Garcı́a González, 1, 41012 Sevilla, Spain
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6
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Chaboy J, Díaz-Moreno S, Díaz-Moreno I, De la Rosa MA, Díaz-Quintana A. How the local geometry of the Cu-binding site determines the thermal stability of blue copper proteins. ACTA ACUST UNITED AC 2011; 18:25-31. [PMID: 21276936 DOI: 10.1016/j.chembiol.2010.12.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Revised: 12/09/2010] [Accepted: 12/10/2010] [Indexed: 12/16/2022]
Abstract
Identifying the factors that govern the thermal resistance of cupredoxins is essential for understanding their folding and stability, and for improving our ability to design highly stable enzymes with potential biotechnological applications. Here, we show that the thermal unfolding of plastocyanins from two cyanobacteria--the mesophilic Synechocystis and the thermophilic Phormidium--is closely related to the short-range structure around the copper center. Cu K-edge X-ray absorption spectroscopy shows that the bond length between Cu and the S atom from the cysteine ligand is a key structural factor that correlates with the thermal stability of the cupredoxins in both oxidized and reduced states. These findings were confirmed by an additional study of a site-directed mutant of Phormidium plastocyanin showing a reverse effect of the redox state on the thermal stability of the protein.
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Affiliation(s)
- Jesús Chaboy
- Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas-Universidad de Zaragoza, 50009 Zaragoza, Spain.
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