3
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McLaughlin MP, Retegan M, Bill E, Payne TM, Shafaat HS, Peña S, Sudhamsu J, Ensign AA, Crane BR, Neese F, Holland PL. Azurin as a protein scaffold for a low-coordinate nonheme iron site with a small-molecule binding pocket. J Am Chem Soc 2012; 134:19746-57. [PMID: 23167247 PMCID: PMC3515693 DOI: 10.1021/ja308346b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The apoprotein of Pseudomonas aeruginosa azurin binds iron(II) to give a 1:1 complex, which has been characterized by electronic absorption, Mössbauer, and NMR spectroscopies, as well as X-ray crystallography and quantum-chemical computations. Despite potential competition by water and other coordinating residues, iron(II) binds tightly to the low-coordinate site. The iron(II) complex does not react with chemical redox agents to undergo oxidation or reduction. Spectroscopically calibrated quantum-chemical computations show that the complex has high-spin iron(II) in a pseudotetrahedral coordination environment, which features interactions with side chains of two histidines and a cysteine as well as the C═O of Gly45. In the (5)A(1) ground state, the d(z(2)) orbital is doubly occupied. Mutation of Met121 to Ala leaves the metal site in a similar environment but creates a pocket for reversible binding of small anions to the iron(II) center. Specifically, azide forms a high-spin iron(II) complex and cyanide forms a low-spin iron(II) complex.
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Affiliation(s)
| | - Marius Retegan
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Thomas M. Payne
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853
| | - Hannah S. Shafaat
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Salvador Peña
- Department of Chemistry, University of Rochester, Rochester, New York 14618
| | - Jawahar Sudhamsu
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853
| | - Amy A. Ensign
- Department of Chemistry, University of Rochester, Rochester, New York 14618
| | - Brian R. Crane
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Patrick L. Holland
- Department of Chemistry, University of Rochester, Rochester, New York 14618
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9
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Matsunaga Y, Fujisawa K, Ibi N, Miyashita Y, Okamoto KI. Structural and Spectroscopic Characterization of First-Row Transition Metal(II) Substituted Blue Copper Model Complexes with Hydrotris(pyrazolyl)borate. Inorg Chem 2004; 44:325-35. [PMID: 15651879 DOI: 10.1021/ic049814x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[CuL(SC(6)F(5))] (1) (L = hydrotris(3,5-diisopropyl-1-pyrazolyl)borate anion) has been reported as a good model for blue copper proteins [Kitajima, N.; Fujisawa, K.; Tanaka, M.; Moro-oka, Y. J. Am. Chem. Soc. 1992, 114, 9232-9233]. To obtain more structural and spectroscopic insight, the first-row transition metal(II) substituted complexes of Cu(II) (1) to Mn(II) (2), Fe(II) (3), Co(II) (4), Ni(II) (5), and Zn(II) (6) were synthesized and their crystal structures were determined. These model complexes have a distorted tetrahedral geometry arising from the tripodal ligand L. The d value, which is defined by the distance from the N(2)S basal plane to the metal(II) ion, and the bond angles such as N-M-N and S-M-N are good indicators of these structural distortions. The obtained complexes were characterized by UV-vis absorption, EPR, NMR, far-IR, and FT-Raman spectroscopies and electrochemical and magnetic properties. In UV-vis absorption spectra, the sulfur-to-metal(II) CT bands and the d-d transition bands are observed for 1 and 3-5. For 1, the strong sulfur to Cu(II) CT band at 663 nm, which is one of the unique properties of blue copper proteins, is observed. The CT energies of the Fe(II) (3), Co(II) (4), and Ni(II) (5) complexes are shifted to higher energy (308 and 355 nm for 3, 311 and 340 nm for 4, 357 and 434 nm for 5) and are almost the same as the corresponding Co(II)- and Ni(II)-substituted blue copper proteins. In the far-IR spectra, three far-IR absorption bands for 2-6 at ca. 400, ca. 350, and ca. 310 cm(-1) are also observed similar to those for 1. Other properties are consistent with their distorted tetrahedral geometries.
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Affiliation(s)
- Yuki Matsunaga
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
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11
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Bertini I, Fernández CO, Karlsson BG, Leckner J, Luchinat C, Malmström BG, Nersissian AM, Pierattelli R, Shipp E, Valentine JS, Vila AJ. Structural Information through NMR Hyperfine Shifts in Blue Copper Proteins. J Am Chem Soc 2000. [DOI: 10.1021/ja992674j] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ivano Bertini
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Claudio O. Fernández
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - B. Göran Karlsson
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Johan Leckner
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Claudio Luchinat
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Bo G. Malmström
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Aram M. Nersissian
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Roberta Pierattelli
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Eric Shipp
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Joan S. Valentine
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
| | - Alejandro J. Vila
- Contribution from the Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy, LANAIS RMN-300, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina, Department of Molecular Biotechnology, Chalmers University of Technology, P.O. Box 462 SE-405 30 Göteborg, Sweden, Department of Chemistry, Biochemistry and Biophysics, Göteborg University, SE-40530 Göteborg, Sweden, Department of Chemistry and
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14
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Jiménez HR, Salgado J, Moratal JM, Morgenstern-Badarau I. EPR and Magnetic Susceptibility Studies of Cobalt(II)- and Nickel(II)-Substituted Azurins from Pseudomonas aeruginosa. Electronic Structure of the Active Sites. Inorg Chem 1996. [DOI: 10.1021/ic9513548] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hermas R. Jiménez
- Department of Inorganic Chemistry, University of Valencia, C/. Dr. Moliner, 50, 46100-Burjassot, Valencia, Spain, and Laboratoire de Chimie Biorganique et Bioinorganique, CNRS-URA 1384, Institut de Chimie Moléculaire d'Orsay, Bât. 420, Université Paris-Sud-XI, 91405-Orsay, France
| | - Jesús Salgado
- Department of Inorganic Chemistry, University of Valencia, C/. Dr. Moliner, 50, 46100-Burjassot, Valencia, Spain, and Laboratoire de Chimie Biorganique et Bioinorganique, CNRS-URA 1384, Institut de Chimie Moléculaire d'Orsay, Bât. 420, Université Paris-Sud-XI, 91405-Orsay, France
| | - José M. Moratal
- Department of Inorganic Chemistry, University of Valencia, C/. Dr. Moliner, 50, 46100-Burjassot, Valencia, Spain, and Laboratoire de Chimie Biorganique et Bioinorganique, CNRS-URA 1384, Institut de Chimie Moléculaire d'Orsay, Bât. 420, Université Paris-Sud-XI, 91405-Orsay, France
| | - Irene Morgenstern-Badarau
- Department of Inorganic Chemistry, University of Valencia, C/. Dr. Moliner, 50, 46100-Burjassot, Valencia, Spain, and Laboratoire de Chimie Biorganique et Bioinorganique, CNRS-URA 1384, Institut de Chimie Moléculaire d'Orsay, Bât. 420, Université Paris-Sud-XI, 91405-Orsay, France
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