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SCHWEITZER-STENNER REINHARD. Polarized resonance Raman dispersion spectroscopy on metalporphyrins. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1002/jpp.307] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Resonance Raman spectroscopy is an ideal tool to investigate the structural properties of chromophores embedded in complex (biological) environments. This holds particularly for metalporphyrins which serve as prosthetic group in various proteins. Resonance Raman dispersion spectroscopy involves the measurement of resonance excitation and depolarization ratios of a large number of Raman lines at various excitation energies covering the spectral region of the chromophore's optical absorption bands. Thus, one obtains resonance excitation profiles and the depolarization ratio dispersion of these bands. While the former contains information about the structure of excited electronic states involved in the Raman scattering process, the latter reflects asymmetric perturbations which lower the porphyrin macrocycle symmetry from ideal D4h. The article introduces and compares different quantum mechanical approaches designed to quantitatively analyze both resonance excitation and the relationship between symmetry lowering and depolarization ratio dispersion.
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Affiliation(s)
- REINHARD SCHWEITZER-STENNER
- Department of Chemistry, University of Puerto Rico, Río Pedras Campus, P.O. Box 23346, San Juan, PR 00931, USA
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Karunakaran V, Denisov I, Sligar SG, Champion PM. Investigation of the low frequency dynamics of heme proteins: native and mutant cytochrome P450(cam) and redox partner complexes. J Phys Chem B 2011; 115:5665-77. [PMID: 21391540 DOI: 10.1021/jp112298y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Vibrational coherence spectroscopy (VCS) is used to investigate the low-frequency dynamics of camphor-free and camphor-bound cytochrome P450(cam) (CYP 101) and its L358P mutant. The low-frequency heme vibrations are found to be perturbed upon binding to the electron transfer partner putidaredoxin (Pdx). A strong correlation between the "detuned" vibrational coherence spectrum, which monitors frequencies between 100 and 400 cm(-1), and the lower frequency part of the Raman spectrum is also demonstrated. The very low frequency region ≤200 cm(-1), uniquely accessed by open-band VCS measurements, reveals a mode near 103 cm(-1) in P450(cam) when camphor is not present in the distal pocket. This reflects the presence of a specific heme distortion, such as saddling or ruffling, in the substrate-free state where water is coordinated to the low-spin iron atom. Such distortions are likely to retard the rate of electron transfer to the substrate-free protein. The presence of strong mode near ∼33 cm(-1) in the camphor-bound form suggests a significant heme-doming distortion, which is supported by analysis using normal coordinate structural decomposition. Pdx also displays a strong coherent vibration near 30 cm(-1) that in principle could be involved in vibrational resonance with its electron transfer target. A splitting of the 33 cm(-1) feature and intensification of a mode near 78 cm(-1) appear when the P450(cam)/Pdx complex is formed. These observations are consistent with vibrational mixing and heme geometric distortions upon Pdx binding that are coincident with the increased thiolate electron donation to the heme. The appearance of a mode near 65 cm(-1) in the coherence spectra of the L358P mutant is comparable to the mode at 78 cm(-1) seen in the P450(cam)/Pdx complex and is consistent with the view that the heme and its environment in the L358P mutant are similar to the Pdx-bound native protein. Resonance Raman spectra are presented for both P450(cam) and the L358P mutant and the changes are correlated with an increased amount of thiolate electron donation to the heme in the mutant sample.
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Affiliation(s)
- Venugopal Karunakaran
- Department of Physics and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, Massachusetts 02115, United States
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Kabir M, Sudhamsu J, Crane BR, Yeh SR, Rousseau DL. Substrate-ligand interactions in Geobacillus stearothermophilus nitric oxide synthase. Biochemistry 2008; 47:12389-97. [PMID: 18956884 PMCID: PMC3403685 DOI: 10.1021/bi801491e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Nitric oxide synthase (NOS) generates NO via a sequential two-step reaction [l-arginine (l-Arg) --> N-hydroxy-l-arginine (NOHA) --> l-citrulline + NO]. Each step of the reaction follows a distinct mechanism defined by the chemical environment introduced by each substrate bound to the heme active site. The dioxygen complex of the NOS enzyme from a thermophilic bacterium, Geobacillus stearothermophilus (gsNOS), is unusually stable; hence, it provides a unique model for the studies of the mechanistic differences between the two steps of the NOS reaction. By using CO as a structural probe, we found that gsNOS exhibits two conformations in the absence of substrate, as indicated by the presence of two sets of nu(Fe-CO)/nu(C-O) modes in the resonance Raman spectra. In the nu(Fe-CO) versus nu(C-O) inverse correlation plot, one set of data falls on the correlation line characterized by mammalian NOSs (mNOS), whereas the other set of data lies on a new correlation line defined by a bacterial NOS from Bacillus subtilis (bsNOS), reflecting a difference in the proximal Fe-Cys bond strength in the two conformers of gsNOS. The addition of l-Arg stabilizes the conformer associated with the mNOS correlation line, whereas NOHA stabilizes the conformer associated with the bsNOS correlation line, although both substrates introduce a positive electrostatic potential into the distal heme pocket. To assess how substrate binding affects Fe-Cys bond strength, the frequency of the Fe-Cys stretching mode of gsNOS was monitored by resonance Raman spectroscopy with 363.8 nm excitation. In the substrate-free form, the Fe-Cys stretching mode was detected at 342.5 cm(-1), similar to that of bsNOS. The binding of l-Arg and NOHA brings about a small decrease and increase in the Fe-Cys stretching frequency, respectively. The implication of these unique structural features with respect to the oxygen chemistry of NOS is discussed.
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Affiliation(s)
- Mariam Kabir
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, NY 10461
| | - Jawahar Sudhamsu
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca NY 14853
| | - Brian R. Crane
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca NY 14853
| | - Syun-Ru Yeh
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, NY 10461
| | - Denis L. Rousseau
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, NY 10461
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Tosha T, Kagawa N, Ohta T, Yoshioka S, Waterman MR, Kitagawa T. Raman evidence for specific substrate-induced structural changes in the heme pocket of human cytochrome P450 aromatase during the three consecutive oxygen activation steps. Biochemistry 2006; 45:5631-40. [PMID: 16634644 DOI: 10.1021/bi060094a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Specific substrate-induced structural changes in the heme pocket are proposed for human cytochrome P450 aromatase (P450arom) which undergoes three consecutive oxygen activation steps. We have experimentally investigated this heme environment by resonance Raman spectra of both substrate-free and substrate-bound forms of the purified enzyme. The Fe-CO stretching mode (nu(Fe)(-)(CO)) of the CO complex and Fe(3+)-S stretching mode (nu(Fe)(-)(S)) of the oxidized form were monitored as a structural marker of the distal and proximal sides of the heme, respectively. The nu(Fe)(-)(CO) mode was upshifted from 477 to 485 and to 490 cm(-)(1) by the binding of androstenedione and 19-aldehyde-androstenedione, substrates for the first and third steps, respectively, whereas nu(Fe)(-)(CO) was not observed for P450arom with 19-hydroxyandrostenedione, a substrate for the second step, indicating that the heme distal site is very flexible and changes its structure depending on the substrate. The 19-aldehyde-androstenedione binding could reduce the electron donation from the axial thiolate, which was evident from the low-frequency shift of nu(Fe)(-)(S) by 5 cm(-)(1) compared to that of androstenedione-bound P450arom. Changes in the environment in the heme distal site and the reduced electron donation from the axial thiolate upon 19-aldehyde-androstenedione binding might stabilize the ferric peroxo species, an active intermediate for the third step, with the suppression of the formation of compound I (Fe(4+)=O porphyrin(+)(*)) that is the active species for the first and second steps. We, therefore, propose that the substrates can regulate the formation of alternative reaction intermediates by modulating the structure on both the heme distal and proximal sites in P450arom.
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Affiliation(s)
- Takehiko Tosha
- Okazaki Institute for Integrative Bioscience, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
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Uchida T, Stevens JM, Daltrop O, Harvat EM, Hong L, Ferguson SJ, Kitagawa T. The Interaction of Covalently Bound Heme with the Cytochrome c Maturation Protein CcmE. J Biol Chem 2004; 279:51981-8. [PMID: 15465823 DOI: 10.1074/jbc.m408963200] [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: 11/06/2022] Open
Abstract
The heme chaperone CcmE is a novel protein that binds heme covalently via a histidine residue as part of its essential function in the process of cytochrome c biogenesis in many bacteria as well as plant mitochondria. In the continued absence of a structure of the holoform of CcmE, identification of the heme ligands is an important step in understanding the molecular function of this protein and the role of covalent heme binding to CcmE during the maturation of c-type cytochromes. In this work, we present spectroscopic data that provide insight into the ligation of the heme iron in the soluble domain of CcmE from Escherichia coli. Resonance Raman spectra demonstrated that one of the heme axial ligands is a histidine residue and that the other is likely to be Tyr134. In addition, the properties of the heme resonances of the holo-protein as compared with those of a form of CcmE with non-covalently bound heme provide evidence for the modification of one of the heme vinyl side chains by the protein, most likely the 2-vinyl group.
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Affiliation(s)
- Takeshi Uchida
- Okazaki Institute for Integrative Bioscience, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8787, Japan
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Chen Z, Ost TWB, Schelvis JPM. Phe393 Mutants of Cytochrome P450 BM3 with Modified Heme Redox Potentials Have Altered Heme Vinyl and Propionate Conformations. Biochemistry 2004; 43:1798-808. [PMID: 14967021 DOI: 10.1021/bi034920g] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It has been well established that the heme redox potential is affected by many different factors. Among others, it is sensitive to the proximal heme ligand and the conformation of the propionate and vinyl groups. In the cytochrome P450 BM3 heme domain, substitution of the highly conserved phenylalanine 393 results in a dramatic change in the heme redox potential [Ost, T. W. B., Miles, C. S., Munro, A. W., Murdoch, J., Reid, G. A., and Chapman, S. K. (2001) Biochemistry 40, 13421-13429]. We have used resonance Raman spectroscopy to characterize heme structural changes and modification of heme interactions with the protein matrix that are induced by the F393 substitutions and to determine their correlation with the heme redox potential. Our results show that the Fe-S stretching frequency of the 5-coordinated, high-spin ferric heme is not affected by the mutations, suggesting that the electron density in the Fe-S bond in this state is not affected by the F393 mutation and is not a good indicator of the heme redox potential. Substrate binding perturbs the hydrogen bonding between one propionate group and the protein matrix and correlates to both the size of residue 393 and the heme redox potential. However, heme reduction does not affect the conformation of the propionate groups. Although the conformation of the vinyl groups is not affected much by substrate binding, their conformation changes from mainly out-of-plane to predominantly in-plane upon heme reduction. The extent of these conformational changes correlates strongly with the size of the 393 residue and the heme redox potential, suggesting that steric interaction between this residue and the vinyl groups may be of importance in regulating the heme redox potential in the P450 BM3 heme domain. Further implications of our findings for the change in redox potential upon mutation of F393 will be discussed.
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Affiliation(s)
- Zhucheng Chen
- Department of Chemistry, New York University, 31 Washington Place, Room 1001, New York, New York 10003, USA
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Chen Z, Wang LH, Schelvis JPM. Resonance Raman investigation of the interaction of thromboxane synthase with substrate analogues. Biochemistry 2003; 42:2542-51. [PMID: 12614148 DOI: 10.1021/bi027206s] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Thromboxane synthase is a hemethiolate enzyme that catalyzes the isomerization of prostaglandin H2 to thromboxane A2. We report the first resonance Raman (RR) spectra of recombinant human thromboxane synthase (TXAS) in both the presence and the absence of substrate analogues U44069 and U46619. The resting enzyme and its U44069 complex are found to have a 6-coordinate, low spin (6c/ls) heme, in agreement with earlier experiments. The U46619-bound enzyme is detected as a 6c/ls heme too, which is in contradiction with a previous conclusion based on absorption difference spectroscopy. Two new vibrations at 368 and 424 cm(-1) are observed upon binding of the substrate analogues in the heme pocket and are assigned to the second propionate and vinyl bending modes, respectively. We interpret the changes in these vibrational modes as the disruption of the protein environment and the hydrogen-bonding network of one of the propionate groups when the substrate analogues enter the heme pocket. We use carbocyclic thromboxane A2 (CTA2) to convert the TXAS heme cofactor to its 5-coordinate, high spin (5c/hs) form, as is confirmed by optical and RR spectroscopy. In this 5c/hs state of the enzyme, the Fe-S stretching frequency is determined at 350 cm(-1) with excitation at 356.4 nm. This assignment is supported by comparison to the spectrum of resting enzyme excited at 356.4 nm and by exciting at different wavelengths. Implications of our findings for substrate binding and the catalytic mechanism of TXAS will be discussed.
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Affiliation(s)
- Zhucheng Chen
- Department of Chemistry, New York University, 31 Washington Place, Room 1001, New York, New York 10003, USA
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Dmochowski IJ, Dunn AR, Wilker JJ, Crane BR, Green MT, Dawson JH, Sligar SG, Winkler JR, Gray HB. Sensitizer-linked substrates and ligands: ruthenium probes of cytochrome P450 structure and mechanism. Methods Enzymol 2003; 357:120-33. [PMID: 12424904 DOI: 10.1016/s0076-6879(02)57672-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Affiliation(s)
- Ivan J Dmochowski
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, USA
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de Visser SP, Ogliaro F, Sharma PK, Shaik S. What Factors Affect the Regioselectivity of Oxidation by Cytochrome P450? A DFT Study of Allylic Hydroxylation and Double Bond Epoxidation in a Model Reaction. J Am Chem Soc 2002; 124:11809-26. [PMID: 12296749 DOI: 10.1021/ja026872d] [Citation(s) in RCA: 249] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Epoxidation (C=C) vis-à-vis allylic hydroxylation (C-H) reactions of propene with a model compound I (Cpd I) of the enzyme cytochrome P450 were studied using B3LYP density functional theory. Potential energy profiles and kinetic isotope effects (KIE) were calculated. The interactions in the protein pocket were mimicked by adding two external NH- - -S hydrogen bonds to the thiolate ligand and by introducing a nonpolar medium (with a dielectric constant, epsilon = 5.7) that can exert a polarization effect on the reacting species. A two-state reactivity (TSR) with high-spin (HS) and low-spin (LS) states were located for both processes (Ogliaro, F.; Harris, N.; Cohen, S.; Filatov, M.; de Visser, S. P.; Shaik, S. J. Am. Chem. Soc. 2000, 122, 8977-8989. de Visser, S. P.; Ogilaro, F.; Harris, N.; Shaik, S. J. Am. Chem. Soc. 2001, 123, 3037-3047). The HS processes were found to be stepwise, whereas the LS processes were characterized as nonsynchronous but effectively concerted pathways. The computed KIE for C-H hydroxylation with and without tunneling corrections are large (>7), and they support the assignment of the corresponding transition states as hydrogen-abstraction species (Groves, J. T.; Han, Y.-Z. In Cytochrome P450: Structures, Mechanism and Biochemistry, 2nd ed.; Ortiz de Montellano, P. R., Ed.; Plenum Press: New York, 1995; Chapter 1; pp 3-48). In the gas phase, epoxidation is energetically favorable by 3.4 kcal mol(-1). Inclusion of zero-point energy reduces this difference but still predicts C=C/C-H > 1. Environmental effects were found to have major impact on the C=C/C-H ratio as well as on the stereoselectivity of the processes. Thus, two NH- - -S hydrogen bonds away from the reaction center reverse the regioselectivity and prefer hydroxylation, namely, C=C/C-H <1. The polarity of the medium further accentuates the trend and leads to a change by 2 orders of magnitude in the regioselectivity, C=C/C-H << 1. Furthermore, since the environmental interactions prefer the LS over the HS reactions, both hydroxylation and epoxidation processes are rendered more stereoselective, again by 2 orders of magnitude. It follows, therefore, that Cpd I is a chameleon oxidant (Ogliaro, F.; Cohen, S.; de Visser, S. P.; Shaik, S. J. Am. Chem. Soc. 2000, 122, 12892-12893; Ogliaro, F.; de Visser, S. P.; Cohen, S.; Kaneti, J.; Shaik, S. Chembiochem. 2001, 2, 848-851; Ogliaro, F.; de Visser, S. P.; Groves, J. T.; Shaik, S. Angew. Chem., Int. Ed. 2001, 40, 2874-2878) that tunes its reactivity and selectivity patterns in response to the protein environment in which it is accommodated. A valence bond (VB) model, akin to "redox mesomerism" (Bernadou, J.; Fabiano, A.-S.; Robert, A.; Meunier, B. J. Am. Chem. Soc. 1994, 116, 9375-9376), is constructed and enables the description of a chameleon transition state. It shows that the good donor ability of the thiolate ligand and the acceptor ability of the iron porphyrin create mixed-valent situations that endow the transition state with a great sensitivity to external perturbations as in the protein pocket. The model is used to discuss the computed results and to relate them to experimental findings.
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Affiliation(s)
- Sam P de Visser
- Department of Organic Chemistry, The Lise Meitner-Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
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Schelvis JPM, Berka V, Babcock GT, Tsai AL. Resonance Raman detection of the Fe-S bond in endothelial nitric oxide synthase. Biochemistry 2002; 41:5695-701. [PMID: 11980473 DOI: 10.1021/bi0118456] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the first low-frequency resonance Raman spectra of ferric endothelial nitric oxide synthase (eNOS) holoenzyme, including the frequency of the Fe-S vibration in the presence of the substrate L-arginine. This is the first direct measurement of the strength of the Fe-S bond in NOS. The Fe-S vibration is observed at 338 cm(-1) with excitation at 363.8 nm. The assignment of this band to the Fe-S stretching vibration was confirmed by the observation of isotopic shifts in eNOS reconstituted with 54Fe- and 57Fe-labeled hemin. Furthermore, the frequency of this vibration is close to those observed in cytochrome P450(cam) and chloroperoxidase (CPO). The frequency of this vibration is lower in eNOS than in P450(cam) and CPO, which can be explained by differences in hydrogen bonding to the proximal cysteine heme ligand. On addition of substrate to eNOS, we also observe several low-frequency vibrations, which are associated with the heme pyrrole groups. The enhancement of these vibrations suggests that substrate binding results in protein-mediated changes of the heme geometry, which may provide the protein with an additional tuning element for the redox potential of the heme iron. The implications of our findings for the function of eNOS will be discussed by comparison with P450(cam) and model compounds.
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Ogliaro F, Cohen S, Filatov M, Harris N, Shaik S. The High-Valent Compound of Cytochrome P450: The Nature of the Fe−S Bond and the Role of the Thiolate Ligand as an Internal Electron Donor. Angew Chem Int Ed Engl 2000; 39:3851-3855. [DOI: 10.1002/1521-3773(20001103)39:21<3851::aid-anie3851>3.0.co;2-9] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2000] [Revised: 08/02/2000] [Indexed: 11/07/2022]
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Ogliaro F, Cohen S, Filatov M, Harris N, Shaik S. The High-Valent Compound of Cytochrome P450: The Nature of the Fe−S Bond and the Role of the Thiolate Ligand as an Internal Electron Donor. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3773(20001103)39:21%3c3851::aid-anie3851%3e3.0.co%3b2-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Ogliaro F, Cohen S, Filatov M, Harris N, Shaik S. The High-Valent Compound of Cytochrome P450: The Nature of the Fe−S Bond and the Role of the Thiolate Ligand as an Internal Electron Donor. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20001103)112:21<4009::aid-ange4009>3.0.co;2-v] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Ogliaro F, Harris N, Cohen S, Filatov M, de Visser SP, Shaik S. A Model “Rebound” Mechanism of Hydroxylation by Cytochrome P450: Stepwise and Effectively Concerted Pathways, and Their Reactivity Patterns. J Am Chem Soc 2000. [DOI: 10.1021/ja991878x] [Citation(s) in RCA: 308] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- François Ogliaro
- Contribution from the Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, Hebrew University, 91904 Jerusalem, Israel
| | - Nathan Harris
- Contribution from the Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, Hebrew University, 91904 Jerusalem, Israel
| | - Shimrit Cohen
- Contribution from the Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, Hebrew University, 91904 Jerusalem, Israel
| | - Michael Filatov
- Contribution from the Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, Hebrew University, 91904 Jerusalem, Israel
| | - Samuël P. de Visser
- Contribution from the Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, Hebrew University, 91904 Jerusalem, Israel
| | - Sason Shaik
- Contribution from the Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, Hebrew University, 91904 Jerusalem, Israel
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15
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Loew GH, Harris DL. Role of the heme active site and protein environment in structure, spectra, and function of the cytochrome p450s. Chem Rev 2000; 100:407-20. [PMID: 11749241 DOI: 10.1021/cr980389x] [Citation(s) in RCA: 221] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G H Loew
- Molecular Research Institute, 2495 Old Middlefield Way, Mountain View, California 94043
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Unno M, Christian JF, Benson DE, Gerber NC, Sligar SG, Champion PM. Resonance Raman Investigations of Cytochrome P450cam Complexed with Putidaredoxin. J Am Chem Soc 1997. [DOI: 10.1021/ja963785a] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masashi Unno
- Contribution from the Department of Physics, Northeastern University, Boston, Massachusetts 02115, and Departments of Biochemistry and Chemistry, University of Illinois at UrbanaChampaign, Urbana, Illinois 61801
| | - James F. Christian
- Contribution from the Department of Physics, Northeastern University, Boston, Massachusetts 02115, and Departments of Biochemistry and Chemistry, University of Illinois at UrbanaChampaign, Urbana, Illinois 61801
| | - David E. Benson
- Contribution from the Department of Physics, Northeastern University, Boston, Massachusetts 02115, and Departments of Biochemistry and Chemistry, University of Illinois at UrbanaChampaign, Urbana, Illinois 61801
| | - Nancy C. Gerber
- Contribution from the Department of Physics, Northeastern University, Boston, Massachusetts 02115, and Departments of Biochemistry and Chemistry, University of Illinois at UrbanaChampaign, Urbana, Illinois 61801
| | - Stephen G. Sligar
- Contribution from the Department of Physics, Northeastern University, Boston, Massachusetts 02115, and Departments of Biochemistry and Chemistry, University of Illinois at UrbanaChampaign, Urbana, Illinois 61801
| | - Paul M. Champion
- Contribution from the Department of Physics, Northeastern University, Boston, Massachusetts 02115, and Departments of Biochemistry and Chemistry, University of Illinois at UrbanaChampaign, Urbana, Illinois 61801
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Tian WD, Wells AV, Champion PM, Di Primo C, Gerber N, Sligar SG. Measurements of CO geminate recombination in cytochromes P450 and P420. J Biol Chem 1995; 270:8673-9. [PMID: 7721770 DOI: 10.1074/jbc.270.15.8673] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The kinetics of CO geminate recombination in cytochrome P450cam are studied at room temperature subsequent to laser photolysis. The geminate rebinding kinetics of P450 are strongly affected by the presence of the camphor substrate. We observe a approximately 2% geminate yield for substrate-bound P450 and a 90% geminate yield when the substrate is absent. The drastic difference in the geminate kinetics suggests that the presence of camphor significantly alters the CO rebinding and escape rates by modifying the heme pocket environment. Two geminate phases and two bimolecular rebinding phases in the substrate free protein were observed, which could arise from slowly interconverting protein conformations. When the temperature or the viscosity of the solution is changed, the fast geminate rate remains the same, whereas the slow geminate rate and the two bimolecular rates change significantly. The geminate rebinding yield of substrate-free P420 is smaller than that of substrate free P450, but its geminate rebinding rate is faster. This demonstrates that in the absence of substrate, CO escapes from the pocket of P420 much more rapidly than from P450 and suggests that the distal pocket environment is altered in the P420 form.
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Affiliation(s)
- W D Tian
- Department of Biochemistry Chemistry and Biophysics, University of Illinois at Urbana Champaign 61801, USA
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Sievertsen S, Ostendorp G, Homborg H. Cobalt- und Rhodiumphthalocyanine mit O-, S- und Se-Donorliganden. Z Anorg Allg Chem 1994. [DOI: 10.1002/zaac.19946200213] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Hu S, Kincaid JR. Resonance Raman studies of the carbonmonoxy form of catalase. Evidence for and effects of phenolate ligation. FEBS Lett 1992; 314:293-6. [PMID: 1468561 DOI: 10.1016/0014-5793(92)81492-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Resonance Raman spectra are reported for the carbon monoxide (CO) adduct of catalase formed from the reaction of peracetic acid or hydrogen peroxide with the azide adduct of catalase in the presence of CO. The expected three normal vibrations of the FE-CO fragment are detected at 1,908,593 and 543 cm-1 for the nu(C-O), delta(Fe-C-O) and nu(Fe-CO), respectively. The expected coordination of the phenolate group in this adduct is confirmed by the enhancement of an internal vibration of phenolate, nu 19a at 1,515 cm-1, and an extraordinary intensity enhancement of the nu(Fe-CO) mode.
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Affiliation(s)
- S Hu
- Chemistry Department, Marquette University, Milwaukee, WI 53233
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Palaniappan V, Terner J. Resonance Raman Spectroscopy of Horseradish Peroxidase Derivatives and Intermediates with Excitation in the Near Ultraviolet. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)71585-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Mantini AR, Marzocchi MP, Smulevich G. Raman excitation profiles and second‐derivative absorption spectra of β‐carotene. J Chem Phys 1989. [DOI: 10.1063/1.457453] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Sage JT, Morikis D, Champion PM. Resonance Raman studies of oriented chromophores: Metmyoglobin single crystals. J Chem Phys 1989. [DOI: 10.1063/1.455904] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Li P, Champion PM. Energy dependent relaxation and the theory of resonance Raman scattering. J Chem Phys 1988. [DOI: 10.1063/1.454154] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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