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Kurtikyan TS, Hovhannisyan AA, Ford PC. Six-Coordinate Ferrous Nitrosyl Complex Fe II(TTP)(PMe 3)(NO) (TTP = meso-Tetra-p-tolylporphyrinato Dianion). Inorg Chem 2016; 55:9517-9520. [PMID: 27643944 DOI: 10.1021/acs.inorgchem.6b01744] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Low-temperature in situ Fourier transform infrared and UV-vis measurements show that trimethylphosphine (PMe3) reacts with microporous layers of FeII(TTP)(NO) (TTP = meso-tetra-p-tolylporphyrinato dianion; NO = nitric oxide) to form the previously unknown six-coordinate complex FeII(TTP)(PMe3)(NO). Upon warming this compound to room temperature in the presence of excess phosphine, the NO ligand is completely replaced by phosphine, resulting in formation of the bis(trimethylphosphine) complex FeII(TTP)(PMe3)2. Simultaneously, the NO released oxidizes free PMe3 to the corresponding phosphine oxide (OPMe3) with concomitant formation of nitrous oxide (N2O).
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Affiliation(s)
- Tigran S Kurtikyan
- Molecule Structure Research Centre of the Scientific and Technological Centre of Organic and Pharmaceutical Chemistry NAS , 0014 Yerevan, Armenia
| | - Astghik A Hovhannisyan
- Molecule Structure Research Centre of the Scientific and Technological Centre of Organic and Pharmaceutical Chemistry NAS , 0014 Yerevan, Armenia
| | - Peter C Ford
- Department of Chemistry and Biochemistry, University of California, Santa Barbara , Santa Barbara, California 93106-9510, United States
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Mono- and bis-phosphine-ligated H93G myoglobin: spectral models for ferrous-phosphine and ferrous-CO cytochrome P450. J Inorg Biochem 2013; 127:238-45. [PMID: 23639797 DOI: 10.1016/j.jinorgbio.2013.03.006] [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] [Received: 12/11/2012] [Revised: 03/13/2013] [Accepted: 03/13/2013] [Indexed: 11/21/2022]
Abstract
To further investigate the properties of phosphines as structural and functional probes of heme proteins, mono- and bis-phosphine [tris(hydroxymethyl)phosphine, THMP] adducts of H93G myoglobin (Mb) have been prepared by stepwise THMP titrations of exogenous ligand-free ferric and ferrous H93G Mb, respectively. Bubbling with CO or stepwise titration with imidazole (Im) of the bis-THMP-ligated ferrous protein generated a mixed ligand (THMP/CO or THMP/Im, respectively) ferrous complexes. Stable oxyferrous H93G(THMP) Mb was formed at -40°C by bubbling the mono-THMP-Fe(II) protein with O2. A THMP-ligated ferryl H93G Mb moiety has been partially formed upon addition of H2O2 to the ferric mono-THMP adduct. All the species prepared above have been characterized with UV-visible (UV-vis) absorption and magnetic circular dichroism (MCD) spectroscopy in this study. The six-coordinate ferrous bis-phosphine and mono-phosphine/CO complexes of H93G Mb exhibit characteristic spectral features (red-shifted Soret/unique-shaped MCD visible bands and hyperporphyrin spectra, respectively) that only have been seen for the analogous phosphine or CO-complexes of thiolate-ligated heme proteins such as cytochrome P450 (P450) and Caldariomyces fumago chloroperoxidase (CPO). However, such resemblance is not seen in phosphine-ligated ferric H93G Mb even though phosphine-bound ferric P450 and CPO display hyperporphyrin spectra. In fact, bis-THMP-bound ferric H93G Mb exhibits MCD and UV-vis absorption spectra that are similar to those of bis-amine- and bis-thioether-ligated H93G Mb complexes. This study also further demonstrates the utility of the H93G cavity mutant for preparing novel heme iron coordination structures.
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Waldeck DH, Khoshtariya DE. Fundamental Studies of Long- and Short-Range Electron Exchange Mechanisms between Electrodes and Proteins. MODERN ASPECTS OF ELECTROCHEMISTRY 2011. [DOI: 10.1007/978-1-4614-0347-0_2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Kang SA, Hoke KR, Crane BR. Solvent Isotope Effects on Interfacial Protein Electron Transfer in Crystals and Electrode Films. J Am Chem Soc 2006; 128:2346-55. [PMID: 16478190 DOI: 10.1021/ja0557482] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
D(2)O-grown crystals of yeast zinc porphyrin substituted cytochrome c peroxidase (ZnCcP) in complex with yeast iso-1-cytochrome c (yCc) diffract to higher resolution (1.7 A) and pack differently than H(2)O-grown crystals (2.4-3.0 A). Two ZnCcP's bind the same yCc (porphyrin-to-porphyrin separations of 19 and 29 A), with one ZnCcP interacting through the same interface found in the H(2)O crystals. The triplet excited-state of at least one of the two unique ZnCcP's is quenched by electron transfer (ET) to Fe(III)yCc (k(e) = 220 s(-1)). Measurement of thermal recombination ET between Fe(II)yCc and ZnCcP+ in the D(2)O-treated crystals has both slow and fast components that differ by 2 orders of magnitude (k(eb)(1) = 2200 s(-1), k(eb)(2) = 30 s(-1)). Back ET in H(2)O-grown crystals is too fast for observation, but soaking H(2)O-grown crystals in D(2)O for hours generates slower back ET, with kinetics similar to those of the D(2)O-grown crystals (k(eb)(1) = 7000 s(-1), k(eb)(2) = 100 s(-1)). Protein-film voltammetry of yCc adsorbed to mixed alkanethiol monolayers on gold electrodes shows slower ET for D(2)O-grown yCc films than for H(2)O-grown films (k(H) = 800 s(-1); k(D) = 540 s(-1) at 20 degrees C). Soaking H(2)O- or D(2)O-grown films in the counter solvent produces an immediate inverse isotope effect that diminishes over hours until the ET rate reaches that found in the counter solvent. Thus, D(2)O substitution perturbs interactions and ET between yCc and either CcP or electrode films. The effects derive from slow exchanging protons or solvent molecules that in the crystal produce only small structural changes.
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Affiliation(s)
- Seong A Kang
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
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Simonneaux G, Bondon A. Mechanism of Electron Transfer in Heme Proteins and Models: The NMR Approach. Chem Rev 2005; 105:2627-46. [PMID: 15941224 DOI: 10.1021/cr030731s] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gérard Simonneaux
- Laboratoire de Chimie Organométallique et Biologique, UMR CNRS 6509, Institut de Chimie, Université de Rennes 1, France.
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Wei JJ, Liu H, Niki K, Margoliash E, Waldeck DH. Probing Electron Tunneling Pathways: Electrochemical Study of Rat Heart Cytochrome c and Its Mutant on Pyridine-Terminated SAMs. J Phys Chem B 2004. [DOI: 10.1021/jp048148i] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. J. Wei
- Chemistry Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, Beckman Institute, California Institute of Technology, Pasadena California 91125, and Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, Illinois 60208
| | - Haiying Liu
- Chemistry Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, Beckman Institute, California Institute of Technology, Pasadena California 91125, and Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, Illinois 60208
| | - K. Niki
- Chemistry Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, Beckman Institute, California Institute of Technology, Pasadena California 91125, and Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, Illinois 60208
| | - E. Margoliash
- Chemistry Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, Beckman Institute, California Institute of Technology, Pasadena California 91125, and Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, Illinois 60208
| | - D. H. Waldeck
- Chemistry Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, Beckman Institute, California Institute of Technology, Pasadena California 91125, and Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, Illinois 60208
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Khoshtariya DE, Wei J, Liu H, Yue H, Waldeck DH. Charge-transfer mechanism for cytochrome c adsorbed on nanometer thick films. Distinguishing frictional control from conformational gating. J Am Chem Soc 2003; 125:7704-14. [PMID: 12812512 DOI: 10.1021/ja034719t] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using nanometer thick tunneling barriers with specifically attached cytochrome c, the electron-transfer rate constant was studied as a function of the SAM composition (alkane versus terthiophene), the omega-terminating group type (pyridine, imidazole, nitrile), and the solution viscosity. At large electrode-reactant separations, the pyridine terminated alkanethiols exhibit an exponential decline of the rate constant with increasing electron-transfer distance. At short separations, a plateau behavior, analogous to systems involving -COOH terminal groups to which cytochrome c can be attached electrostatically, is observed. The dependence of the rate constant in the plateau region on system properties is investigated. The rate constant is insensitive to the mode of attachment to the surface but displays a significant viscosity dependence, change with spacer composition (alkane versus terthiophene), and nature of the solvent (H(2)O versus D(2)O). Based on these findings and others, the conclusion is drawn that the charge-transfer rate constant at short distance is determined by polarization relaxation processes in the structure, rather than the electron tunneling probability or large-amplitude conformational rearrangement (gating). The transition in reaction mechanism with distance reflects a gradual transition between the tunneling and frictional mechanisms. This conclusion is consistent with data from a number of other sources as well.
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Pilard MA, Guillemot M, Toupet L, Jordanov J, Simonneaux G. Effect of Phosphorus Axial π-Acceptors in Iron(III) Porphyrinates: Characterization of Low-Spin Complexes [(PPh(OMe)2)2Fe(T(p-Me)PP)]CF3SO3 and [(PPh(OEt)2)2Fe(T(p-Me)PP)]CF3SO3. Inorg Chem 1997. [DOI: 10.1021/ic9704849] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marie-Agnès Pilard
- Laboratoire de Chimie Organométallique et Biologique, URA CNRS 415, Université de Rennes 1, 35042 Rennes Cedex, France, Groupe de Physique Cristalline, UA CNRS 040804, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, and Service de Chimie Inorganique et Biologique, CENG, 38054 Grenoble Cedex, France
| | - Maud Guillemot
- Laboratoire de Chimie Organométallique et Biologique, URA CNRS 415, Université de Rennes 1, 35042 Rennes Cedex, France, Groupe de Physique Cristalline, UA CNRS 040804, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, and Service de Chimie Inorganique et Biologique, CENG, 38054 Grenoble Cedex, France
| | - Loïc Toupet
- Laboratoire de Chimie Organométallique et Biologique, URA CNRS 415, Université de Rennes 1, 35042 Rennes Cedex, France, Groupe de Physique Cristalline, UA CNRS 040804, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, and Service de Chimie Inorganique et Biologique, CENG, 38054 Grenoble Cedex, France
| | - J. Jordanov
- Laboratoire de Chimie Organométallique et Biologique, URA CNRS 415, Université de Rennes 1, 35042 Rennes Cedex, France, Groupe de Physique Cristalline, UA CNRS 040804, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, and Service de Chimie Inorganique et Biologique, CENG, 38054 Grenoble Cedex, France
| | - Gérard Simonneaux
- Laboratoire de Chimie Organométallique et Biologique, URA CNRS 415, Université de Rennes 1, 35042 Rennes Cedex, France, Groupe de Physique Cristalline, UA CNRS 040804, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, and Service de Chimie Inorganique et Biologique, CENG, 38054 Grenoble Cedex, France
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