51
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Ban F, Lundqvist MJ, Boyd RJ, Eriksson LA. Theoretical studies of the cross-linking mechanisms between cytosine and tyrosine. J Am Chem Soc 2002; 124:2753-61. [PMID: 11890827 DOI: 10.1021/ja011528m] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
DNA-protein cross-linking is one of the many DNA lesions mediated by hydroxyl radicals, the most damaging among the reactive oxygen species in biological systems. Density functional theory methods are employed to investigate the complex reaction mechanisms of the formation of cytosine-tyrosine cross-links as observed in gamma-irradiated aqueous solutions of cytosine and tyrosine, as well as in gamma-irradiated nucleohistone. The majority of the radical addition mechanisms considered are found to have significant barriers and therefore to be thermodynamically unfavorable for the formation of the initial cross-linked product. Our calculated reaction potential energy surfaces suggest that a feasible complete mechanism consists of radical combination forming the initial cross-linked product, a hydrogen shuffle within the initial cross-linked product, and an acid-catalyzed dehydration reaction. Water and hydrogen-bonding interactions are suggested to play a key role in catalyzing the hydrogen-transfer step of the reaction.
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Affiliation(s)
- Fuqiang Ban
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4J3, Canada
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52
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Affiliation(s)
- R P Pesavento
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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53
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Bleifuss G, Kolberg M, Pötsch S, Hofbauer W, Bittl R, Lubitz W, Gräslund A, Lassmann G, Lendzian F. Tryptophan and tyrosine radicals in ribonucleotide reductase: a comparative high-field EPR study at 94 GHz. Biochemistry 2001; 40:15362-8. [PMID: 11735419 DOI: 10.1021/bi010707d] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tryptophan radicals, which are generated in the reconstitution reaction of mutants Y122F and Y177W of subunit R2 apoprotein of E. coli and mouse ribonucleotide reductase (RNR), respectively, with Fe(2+) and oxygen, are investigated by high-field EPR at 94 GHz and compared with the tyrosine radicals occurring in the respective wild-type proteins. For the first time, accurate g-values are obtained for protein-associated neutral tryptophan free radicals, which show only a small anisotropy. The apparent hyperfine patterns observed in frozen solutions are very similar for tryptophan and tyrosine radicals in mouse subunit R2 at conventional X-band EPR. The radicals can, however, be discriminated by their different g-tensors using high-field EPR. Tryptophan radicals were postulated as reaction intermediates in the proposed radical transfer pathway of RNR. Furthermore, the data obtained here for the electronic structure of protein-associated tryptophan neutral free radicals are important for identification and understanding of the functional important tryptophan radicals which occur in other enzymes, e.g., DNA photolyase and cytochrome c peroxidase, where they are magnetically coupled to other radicals or to a metal center.
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Affiliation(s)
- G Bleifuss
- Max-Volmer-Laboratorium für Biophysikalische Chemie, Institut für Chemie, Technische Universität Berlin, PC 14, Strasse des 17. Juni 135, D-10623 Berlin, Germany
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54
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Sahlin M, Sjöberg BM. Ribonucleotide reductase. A virtual playground for electron transfer reactions. Subcell Biochem 2001; 35:405-43. [PMID: 11192729 DOI: 10.1007/0-306-46828-x_12] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- M Sahlin
- Department of Molecular Biology, Stockholm University, SE-10691 Stockholm, Sweden
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55
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Debus RJ. Amino acid residues that modulate the properties of tyrosine Y(Z) and the manganese cluster in the water oxidizing complex of photosystem II. BIOCHIMICA ET BIOPHYSICA ACTA 2001; 1503:164-86. [PMID: 11115632 DOI: 10.1016/s0005-2728(00)00221-8] [Citation(s) in RCA: 150] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The catalytic site for photosynthetic water oxidation is embedded in a protein matrix consisting of nearly 30 different polypeptides. Residues from several of these polypeptides modulate the properties of the tetrameric Mn cluster and the redox-active tyrosine residue, Y(Z), that are located at the catalytic site. However, most or all of the residues that interact directly with Y(Z) and the Mn cluster appear to be contributed by the D1 polypeptide. This review summarizes our knowledge of the environments of Y(Z) and the Mn cluster as obtained from the introduction of site-directed, deletion, and other mutations into the photosystem II polypeptides of the cyanobacterium Synechocystis sp. PCC 6803 and the green alga Chlamydomonas reinhardtii.
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Affiliation(s)
- R J Debus
- Department of Biochemistry, University of California, Riverside, CA 92521-0129, USA.
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56
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57
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Huque Y, Fieschi F, Torrents E, Gibert I, Eliasson R, Reichard P, Sahlin M, Sjoberg BM. The active form of the R2F protein of class Ib ribonucleotide reductase from Corynebacterium ammoniagenes is a diferric protein. J Biol Chem 2000; 275:25365-71. [PMID: 10801858 DOI: 10.1074/jbc.m002751200] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Corynebacterium ammoniagenes contains a ribonucleotide reductase (RNR) of the class Ib type. The small subunit (R2F) of the enzyme has been proposed to contain a manganese center instead of the dinuclear iron center, which in other class I RNRs is adjacent to the essential tyrosyl radical. The nrdF gene of C. ammoniagenes, coding for the R2F component, was cloned in an inducible Escherichia coli expression vector and overproduced under three different conditions: in manganese-supplemented medium, in iron-supplemented medium, and in medium without addition of metal ions. A prominent typical tyrosyl radical EPR signal was observed in cells grown in rich medium. Iron-supplemented medium enhanced the amount of tyrosyl radical, whereas cells grown in manganese-supplemented medium had no such radical. In highly purified R2F protein, enzyme activity was found to correlate with tyrosyl radical content, which in turn correlated with iron content. Similar results were obtained for the R2F protein of Salmonella typhimurium class Ib RNR. The UV-visible spectrum of the C. ammoniagenes R2F radical has a sharp 408-nm band. Its EPR signal at g = 2.005 is identical to the signal of S. typhimurium R2F and has a doublet with a splitting of 0.9 millitesla (mT), with additional hyperfine splittings of 0.7 mT. According to X-band EPR at 77-95 K, the inactive manganese form of the C. ammoniagenes R2F has a coupled dinuclear Mn(II) center. Different attempts to chemically oxidize Mn-R2F showed no relation between oxidized manganese and tyrosyl radical formation. Collectively, these results demonstrate that enzymatically active C. ammoniagenes RNR is a generic class Ib enzyme, with a tyrosyl radical and a diferric metal cofactor.
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Affiliation(s)
- Y Huque
- Department of Molecular Biology, Arrhenius Laboratories, Stockholm University, Sweden
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58
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Shi W, Hoganson CW, Espe M, Bender CJ, Babcock GT, Palmer G, Kulmacz RJ, Tsai AL. Electron paramagnetic resonance and electron nuclear double resonance spectroscopic identification and characterization of the tyrosyl radicals in prostaglandin H synthase 1. Biochemistry 2000; 39:4112-21. [PMID: 10747802 DOI: 10.1021/bi992561c] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The tyrosyl radicals generated in reactions of ethyl hydrogen peroxide with both native and indomethacin-pretreated prostaglandin H synthase 1 (PGHS-1) were examined by low-temperature electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) spectroscopies. In the reaction of peroxide with the native enzyme at 0 degrees C, the tyrosyl radical EPR signal underwent a continuous reduction in line width and lost intensity as the incubation time increased, changing from an initial, 35-G wide doublet to a wide singlet of slightly smaller line width and finally to a 25-G narrow singlet. The 25-G narrow singlet produced by self-inactivation was distinctly broader than the 22-G narrow singlet obtained by indomethacin treatment. Analysis of the narrow singlet EPR spectra of self-inactivated and indomethacin-pretreated enzymes suggests that they reflect conformationally distinct tyrosyl radicals. ENDOR spectroscopy allowed more detailed characterization by providing hyperfine couplings for ring and methylene protons. These results establish that the wide doublet and the 22-G narrow singlet EPR signals arise from tyrosyl radicals with different side-chain conformations. The wide-singlet ENDOR spectrum, however, is best accounted for as a mixture of native wide-doublet and self-inactivated 25-G narrow-singlet species, consistent with an earlier EPR study [DeGray et al. (1992) J. Biol. Chem. 267, 23583-23588]. We conclude that a tyrosyl residue other than the catalytically essential Y385 species is most likely responsible for the indomethacin-inhibited, narrow-singlet spectrum. Thus, this inhibitor may function by redirecting radical formation to a catalytically inactive side chain. Either radical migration or conformational relaxation at Y385 produces the 25-G narrow singlet during self-inactivation. Our ENDOR data also indicate that the catalytically active, wide-doublet species is not hydrogen bonded, which may enhance its reactivity toward the fatty-acid substrate bound nearby.
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Affiliation(s)
- W Shi
- Department of Internal Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77225, USA
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59
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Gunther MR, Sturgeon BE, Mason RP. A long-lived tyrosyl radical from the reaction between horse metmyoglobin and hydrogen peroxide. Free Radic Biol Med 2000; 28:709-19. [PMID: 10754266 DOI: 10.1016/s0891-5849(00)00164-7] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The reaction between metmyoglobin (metMb) and hydrogen peroxide has been known since the 1950s to produce globin-centered free radicals. The direct electron spin resonance spectrum of a solution of horse metMb and hydrogen peroxide at room temperature consists of a multilined signal that decays in minutes at room temperature. Comparison of the direct ESR spectra obtained from the system under N(2)- and O(2)-saturated conditions demonstrates the presence of a peroxyl radical, identified by its g-value of 2.014. Computer simulations of the spectra recorded 3 s after the mixture of metMb and H(2)O(2) were calculated using hyperfine coupling constants of a(H2,6) = 1.3 G and a(H3,5) = 7.0 G for the ring and a(beta)(H1) = 16.7 G and a(beta)(H2) = 14.2 G for the methylene protons, and are consistent with a highly constrained, conformationally unstable tyrosyl radical. Spectra obtained at later time points contained a mixture of the 3 s signal and another signal that was insufficiently resolved for simulation. Efficient spin trapping with 3, 5-dibromo-4-nitrosobenzenesulfonic acid was observed only when the spin trap was present at the time of H(2)O(2) addition. Spin trapping experiments with either 5,5-dimethyl-1-pyrroline N-oxide (DMPO) or perdeuterated 2-methyl-2-nitrosopropane (MNP-d(9)), which have been shown to trap tyrosyl radicals, were nearly equally effective when the spin trap was added before or 10 min after the addition of H(2)O(2). The superhyperfine structure of the ESR spectra obtained from Pronase-treated MNP-d(9)/*metMb confirmed the assignment to a tyrosyl radical. Delayed spin trapping experiments with site-directed mutant myoglobins in which either Tyr-103 or Tyr-146 was replaced by phenylalanine indicated that radical adduct formation with either DMPO or MNP-d(9) requires the presence of Tyr-103 at all time points, implicating that residue as the radical site.
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Affiliation(s)
- M R Gunther
- Laboratory of Pharmacology and Chemistry, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA.
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60
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Liu A, Barra AL, Rubin H, Lu G, Gräslund A. Heterogeneity of the Local Electrostatic Environment of the Tyrosyl Radical in Mycobacterium tuberculosis Ribonucleotide Reductase Observed by High-Field Electron Paramagnetic Resonance. J Am Chem Soc 2000. [DOI: 10.1021/ja990123n] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aimin Liu
- Contribution from the Department of Biophysics, Arrhenius Laboratories, Stockholm University, S-106 91 Stockholm, Sweden, High Magnetic Field Laboratory, CNRS/MPI, F-38042 Grenoble Cedex, France, and Division of Infectious Diseases, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Anne-Laure Barra
- Contribution from the Department of Biophysics, Arrhenius Laboratories, Stockholm University, S-106 91 Stockholm, Sweden, High Magnetic Field Laboratory, CNRS/MPI, F-38042 Grenoble Cedex, France, and Division of Infectious Diseases, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Harvey Rubin
- Contribution from the Department of Biophysics, Arrhenius Laboratories, Stockholm University, S-106 91 Stockholm, Sweden, High Magnetic Field Laboratory, CNRS/MPI, F-38042 Grenoble Cedex, France, and Division of Infectious Diseases, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Guizhen Lu
- Contribution from the Department of Biophysics, Arrhenius Laboratories, Stockholm University, S-106 91 Stockholm, Sweden, High Magnetic Field Laboratory, CNRS/MPI, F-38042 Grenoble Cedex, France, and Division of Infectious Diseases, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Astrid Gräslund
- Contribution from the Department of Biophysics, Arrhenius Laboratories, Stockholm University, S-106 91 Stockholm, Sweden, High Magnetic Field Laboratory, CNRS/MPI, F-38042 Grenoble Cedex, France, and Division of Infectious Diseases, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
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61
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Lundqvist MJ, Eriksson LA. Hydroxyl Radical Reactions with Phenol as a Model for Generation of Biologically Reactive Tyrosyl Radicals. J Phys Chem B 2000. [DOI: 10.1021/jp993011r] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maria J. Lundqvist
- Department of Quantum Chemistry, Box 518, Uppsala University, 751 20 Uppsala, Sweden, and Department of Chemical Engineering, Box 325, Mälardalen University, 631 05 Eskilstuna, Sweden
| | - Leif A. Eriksson
- Department of Quantum Chemistry, Box 518, Uppsala University, 751 20 Uppsala, Sweden, and Department of Chemical Engineering, Box 325, Mälardalen University, 631 05 Eskilstuna, Sweden
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62
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Kálmán L, LoBrutto R, Allen JP, Williams JC. Modified reaction centres oxidize tyrosine in reactions that mirror photosystem II. Nature 1999. [DOI: 10.1038/45300] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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63
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Mezzetti A, Maniero AL, Brustolon M, Giacometti G, Brunel LC. A Tyrosyl Radical in an Irradiated Single Crystal of N-Acetyl-l-tyrosine Studied by X-band cw-EPR, High-Frequency EPR, and ENDOR Spectroscopies. J Phys Chem A 1999. [DOI: 10.1021/jp9903763] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alberto Mezzetti
- Dipartimento di Chimica Fisica “A. Miolati”, Università di Padova, Italy
| | - Anna Lisa Maniero
- Dipartimento di Chimica Fisica “A. Miolati”, Università di Padova, Italy
| | - Marina Brustolon
- Dipartimento di Chimica Fisica “A. Miolati”, Università di Padova, Italy
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64
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Burdinski D, Wieghardt K, Steenken S. Intramolecular Electron Transfer from Mn or Ligand Phenolate to Photochemically Generated RuIII in Multinuclear Ru/Mn Complexes. Laser Flash Photolysis and EPR Studies on Photosystem II Models. J Am Chem Soc 1999. [DOI: 10.1021/ja991402d] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dirk Burdinski
- Contribution from the Max-Planck-Institut für Strahlenchemie, D-45413 Mülheim, Germany
| | - Karl Wieghardt
- Contribution from the Max-Planck-Institut für Strahlenchemie, D-45413 Mülheim, Germany
| | - Steen Steenken
- Contribution from the Max-Planck-Institut für Strahlenchemie, D-45413 Mülheim, Germany
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65
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Colchicine red-ox chemistry revisited: Cathodic behavior and EPR observation of an intermediate radical anion. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00659-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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66
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MacMillan F, Kannt A, Behr J, Prisner T, Michel H. Direct evidence for a tyrosine radical in the reaction of cytochrome c oxidase with hydrogen peroxide. Biochemistry 1999; 38:9179-84. [PMID: 10413492 DOI: 10.1021/bi9911987] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cytochrome c oxidase (COX) catalyzes the reduction of oxygen to water, a process which is accompanied by the pumping of four protons across the membrane. Elucidation of the structures of intermediates in these processes is crucial for understanding the mechanism of oxygen reduction. In the work presented here, the reaction of H(2)O(2) with the fully oxidized protein at pH 6.0 has been investigated with electron paramagnetic resonance (EPR) spectroscopy. The results reveal an EPR signal with partially resolved hyperfine structure typical of an organic radical. The yield of this radical based on comparison with other paramagnetic centers in COX was approximately 20%. Recent crystallographic data have shown that one of the Cu(B) ligands, His 276 (in the bacterial case), is cross-linked to Tyr 280 and that this cross-linked tyrosine is ideally positioned to participate in dioxygen activation. Here selectively deuterated tyrosine has been incorporated into the protein, and a drastic change in the line shape of the EPR signal observed above has been detected. This would suggest that the observed EPR signal does indeed arise from a tyrosine radical species. It would seem also quite possible that this radical is an intermediate in the mechanism of oxygen reduction.
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Affiliation(s)
- F MacMillan
- Institut für Physikalische und Theoretische Chemie, J. W. Goethe Universität Frankfurt, Germany.
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67
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Bennati M, Farrar CT, Bryant JA, Inati SJ, Weis V, Gerfen GJ, Riggs-Gelasco P, Stubbe J, Griffin RG. Pulsed electron-nuclear double resonance (ENDOR) at 140 GHz. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1999; 138:232-243. [PMID: 10341127 DOI: 10.1006/jmre.1999.1727] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We describe a spectrometer for pulsed ENDOR at 140 GHz, which is based on microwave IMPATT diode amplifiers and a probe consisting of a TE011 cavity with a high-quality resonance circuit for variable radiofrequency irradiation. For pulsed EPR we obtain an absolute sensitivity of 3x10(9) spins/Gauss at 20 K. The performance of the spectrometer is demonstrated with pulsed ENDOR spectra of a standard bis-diphenylene-phenyl-allyl (BDPA) doped into polystyrene and of the tyrosyl radical from E. coli ribonucleotide reductase (RNR). The EPR spectrum of the RNR tyrosyl radical displays substantial g-anisotropy at 5 T and is used to demonstrate orientation-selective Davies-ENDOR.
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Affiliation(s)
- M Bennati
- Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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68
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Liu A, Pötsch S, Davydov A, Barra AL, Rubin H, Gräslund A. The tyrosyl free radical of recombinant ribonucleotide reductase from Mycobacterium tuberculosis is located in a rigid hydrophobic pocket. Biochemistry 1998; 37:16369-77. [PMID: 9819229 DOI: 10.1021/bi981471p] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The tyrosyl free radical in protein R2-2 of class Ib ribonucleotide reductase (RNR) fromMycobacterium tuberculosis is essential for the enzymatic activity and has an EPR spectrum remarkably similar to that of the tyrosyl radical YD* in PSII. The EPR relaxation properties of the radical suggest a very weak exchange coupling between the two redox centers, the radical and the diferric cluster. The tyrosyl radical gives almost identical EPR spectra in the temperature interval 10-293 K. We conclude that the tyrosyl radical sits in a rigid pocket. Two ring protons and one beta-methylene proton account for the major anisotropic hyperfine interactions. A high-frequency EPR spectrum of the radical showed a resolved gx = 2. 0092, indicating that a hydrogen bond to the phenolic oxygen of the radical is absent. Theoretical modeling studies based on the structural data known for Salmonella typhimurium class Ib RNR protein R2F revealed a hydrophobic wall aligned with the radical harboring residue Y110. The distance between the phenolic oxygen of the radical and the diferric cluster is longer in the two class Ib nrdF R2 proteins than in other characterized class Ia R2 proteins. The tyrosyl radical in protein R2-2 from M. tuberculosis was accessible to direct reduction by dithionite in the absence of a mediator. The radical could be partly regenerated when the system was exposed to O2 after the completion of anaerobic reduction. This indicates that the Fe3+ ions also had become reduced by dithionite.
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Affiliation(s)
- A Liu
- Department of Biophysics, Arrhenius Laboratories, Stockholm University, Sweden
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69
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Tommos C, McCracken J, Styring S, Babcock GT. Stepwise Disintegration of the Photosynthetic Oxygen-Evolving Complex. J Am Chem Soc 1998. [DOI: 10.1021/ja980281z] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cecilia Tommos
- Contribution from the Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, Department of Biochemistry, Arrhenius Laboratories for Natural Sciences, Stockholm University, S-10691 Stockholm, Sweden, and Department of Biochemistry, Center for Chemistry and Chemical Engineering, Lund University, S-22100 Lund, Sweden
| | - John McCracken
- Contribution from the Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, Department of Biochemistry, Arrhenius Laboratories for Natural Sciences, Stockholm University, S-10691 Stockholm, Sweden, and Department of Biochemistry, Center for Chemistry and Chemical Engineering, Lund University, S-22100 Lund, Sweden
| | - Stenbjörn Styring
- Contribution from the Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, Department of Biochemistry, Arrhenius Laboratories for Natural Sciences, Stockholm University, S-10691 Stockholm, Sweden, and Department of Biochemistry, Center for Chemistry and Chemical Engineering, Lund University, S-22100 Lund, Sweden
| | - Gerald T. Babcock
- Contribution from the Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, Department of Biochemistry, Arrhenius Laboratories for Natural Sciences, Stockholm University, S-10691 Stockholm, Sweden, and Department of Biochemistry, Center for Chemistry and Chemical Engineering, Lund University, S-22100 Lund, Sweden
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70
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Hays AM, Vassiliev IR, Golbeck JH, Debus RJ. Role of D1-His190 in proton-coupled electron transfer reactions in photosystem II: a chemical complementation study. Biochemistry 1998; 37:11352-65. [PMID: 9698383 DOI: 10.1021/bi980510u] [Citation(s) in RCA: 145] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Recent models for water oxidation in photosystem II propose that His190 of the D1 polypeptide facilitates electron transfer from tyrosine YZ to P680+ by accepting the hydroxyl proton from YZ. To test these models, and to further define the role of D1-His190 in the proton-coupled electron transfer reactions of PSII, the rates of P680+ reduction, YZ oxidation, QA- oxidation, and YZ* reduction were measured in PSII particles isolated from several D1-His190 mutants constructed in the cyanobacterium Synechocystis sp. PCC 6803. These measurements were conducted in the absence and presence of imidazole and other small organic bases. In all mutants examined, the rates of P680+ reduction, YZ oxidation, and YZ* reduction after a single flash were slowed dramatically and the rate of QA- oxidation was accelerated to values consistent with the reduction of P680+ by QA- rather than by YZ. There appeared to be little correlation between these rates and the nature of the residue substituted for D1-His190. However, in nearly all mutants examined, the rates of P680+ reduction, YZ oxidation, and YZ* reduction were accelerated dramatically in the presence of imidazole and other small organic bases (e.g., methyl-substituted imidazoles, histidine, methylamine, ethanolamine, and TRIS). In addition, the rate of QA- oxidation was decelerated substantially. For example, in the presence of 100 mM imidazole, the rate of electron transfer from YZ to P680+ in most D1-His190 mutants increased 26-87-fold. Furthermore, in the presence of 5 mM imidazole, the rate of YZ* reduction in the D1-His190 mutants increased to values comparable to that of Mn-depleted wild-type PSII particles in the absence of imidazole. On the basis of these results, we conclude that D1-His190 is the immediate proton acceptor for YZ and that the hydroxyl proton of YZ remains bound to D1-His190 during the lifetime of YZ*, thereby facilitating the reduction of YZ*.
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Affiliation(s)
- A M Hays
- Department of Biochemistry, University of California at Riverside 92521-0129, USA
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71
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Siegbahn PE, Blomberg MR, Pavlov M. A comparison of electron transfer in ribonucleotide reductase and the bacterial photosynthetic reaction center. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)00688-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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72
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van Dam PJ, Willems JP, Schmidt PP, Pötsch S, Barra AL, Hagen WR, Hoffman BM, Andersson KK, Gräslund A. High-Frequency EPR and Pulsed Q-Band ENDOR Studies on the Origin of the Hydrogen Bond in Tyrosyl Radicals of Ribonucleotide Reductase R2 Proteins from Mouse and Herpes Simplex Virus Type 1. J Am Chem Soc 1998. [DOI: 10.1021/ja9737127] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pieter J. van Dam
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - Jean-Paul Willems
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - Peter P. Schmidt
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - Stephan Pötsch
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - Anne-Laure Barra
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - Wilfred R. Hagen
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - Brian M. Hoffman
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - K. Kristoffer Andersson
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
| | - Astrid Gräslund
- Contribution from the Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry, University of Oslo, P.O. Box 1041 Blindern, N-0316 Oslo, Norway, Department of Biophysics, Stockholm University, S-106 91 Stockholm, Sweden, and High Magnetic Field Laboratory, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France
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73
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Affiliation(s)
- JoAnne Stubbe
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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74
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Nieuwenhuis SAM, Hulsebosch RJ, Raap J, Gast P, Lugtenburg J, Hoff AJ. Structure of the YD Tyrosine Radical in Photosystem II. Determination of the Orientation of the Phenoxyl Ring by Enantioselective Deuteration of the Methylene Group. J Am Chem Soc 1998. [DOI: 10.1021/ja971874x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. A. M. Nieuwenhuis
- Leiden Institute of Chemistry, Gorlaeus Laboratories Department of Biophysics, Huygens Laboratory Leiden University, P.O. Box 9504 2300 RA Leiden, The Netherlands
| | - R. J. Hulsebosch
- Leiden Institute of Chemistry, Gorlaeus Laboratories Department of Biophysics, Huygens Laboratory Leiden University, P.O. Box 9504 2300 RA Leiden, The Netherlands
| | - J. Raap
- Leiden Institute of Chemistry, Gorlaeus Laboratories Department of Biophysics, Huygens Laboratory Leiden University, P.O. Box 9504 2300 RA Leiden, The Netherlands
| | - P. Gast
- Leiden Institute of Chemistry, Gorlaeus Laboratories Department of Biophysics, Huygens Laboratory Leiden University, P.O. Box 9504 2300 RA Leiden, The Netherlands
| | - J. Lugtenburg
- Leiden Institute of Chemistry, Gorlaeus Laboratories Department of Biophysics, Huygens Laboratory Leiden University, P.O. Box 9504 2300 RA Leiden, The Netherlands
| | - A. J. Hoff
- Leiden Institute of Chemistry, Gorlaeus Laboratories Department of Biophysics, Huygens Laboratory Leiden University, P.O. Box 9504 2300 RA Leiden, The Netherlands
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75
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Dole F, Diner BA, Hoganson CW, Babcock GT, Britt RD. Determination of the Electron Spin Density on the Phenolic Oxygen of the Tyrosyl Radical of Photosystem II. J Am Chem Soc 1997. [DOI: 10.1021/ja9717727] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- François Dole
- Central Research and Development Department Experimental Station, E. I. du Pont de Nemours & Co. Wilmington, Delaware 19880-0173 Department of Chemistry, Michigan State University East Lansing, Michigan 48824-1322 Department of Chemistry, University of California Davis, California 95616
| | - Bruce A. Diner
- Central Research and Development Department Experimental Station, E. I. du Pont de Nemours & Co. Wilmington, Delaware 19880-0173 Department of Chemistry, Michigan State University East Lansing, Michigan 48824-1322 Department of Chemistry, University of California Davis, California 95616
| | - Curtis W. Hoganson
- Central Research and Development Department Experimental Station, E. I. du Pont de Nemours & Co. Wilmington, Delaware 19880-0173 Department of Chemistry, Michigan State University East Lansing, Michigan 48824-1322 Department of Chemistry, University of California Davis, California 95616
| | - Gerald T. Babcock
- Central Research and Development Department Experimental Station, E. I. du Pont de Nemours & Co. Wilmington, Delaware 19880-0173 Department of Chemistry, Michigan State University East Lansing, Michigan 48824-1322 Department of Chemistry, University of California Davis, California 95616
| | - R. David Britt
- Central Research and Development Department Experimental Station, E. I. du Pont de Nemours & Co. Wilmington, Delaware 19880-0173 Department of Chemistry, Michigan State University East Lansing, Michigan 48824-1322 Department of Chemistry, University of California Davis, California 95616
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76
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Hulsebosch RJ, van den Brink JS, Nieuwenhuis SAM, Gast P, Raap J, Lugtenburg J, Hoff AJ. Electronic Structure of the Neutral Tyrosine Radical in Frozen Solution. Selective 2H-, 13C-, and 17O-Isotope Labeling and EPR Spectroscopy at 9 and 35 GHz. J Am Chem Soc 1997. [DOI: 10.1021/ja9707872] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. J. Hulsebosch
- Contribution from the Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - J. S. van den Brink
- Contribution from the Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - S. A. M. Nieuwenhuis
- Contribution from the Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - P. Gast
- Contribution from the Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - J. Raap
- Contribution from the Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - J. Lugtenburg
- Contribution from the Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - A. J. Hoff
- Contribution from the Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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77
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Farrar CT, Gerfen GJ, Griffin RG, Force DA, Britt RD. Electronic Structure of the YD Tyrosyl Radical in Photosystem II: A High-Frequency Electron Paramagnetic Resonance Spectroscopic and Density Functional Theoretical Study. J Phys Chem B 1997. [DOI: 10.1021/jp9709518] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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78
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Ivancich A, Jouve HM, Sartor B, Gaillard J. EPR investigation of compound I in Proteus mirabilis and bovine liver catalases: formation of porphyrin and tyrosyl radical intermediates. Biochemistry 1997; 36:9356-64. [PMID: 9235978 DOI: 10.1021/bi970886s] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Compound I of Proteus mirabilis and bovine liver catalases (PMC and BLC, respectively) were studied combining EPR spectroscopy and the rapid-mix freeze-quench techniques. Both enzymes, when treated with peroxyacetic acid, form a catalytic intermediate which consists of an oxoferryl porphyrin pi-cation radical. In PMC this intermediate is semistable, and an unexpected reversible equilibrium under pH influence takes place between two forms of compound I with different coupling between the oxoferryl and the porphyrin pi-cation radical. At acid pH, one form has a ferromagnetic character as in Micrococcus luteus compound I. At neutral pH, another form with a much smaller coupling, reminiscent of the horse radish peroxidase compound I, is detected. The approximate midpoint, estimated for these changes in the range 5.3 < pH < 6.0, approaches the pKa value of an histidyl residue. The residues possibly involved in the transformation are discussed in terms of the known structure of PMC compound I. The EPR spectrum of BLC compound I (pH 5.6), obtained in the millisecond time scale (40 ms), also showed a mixture of two forms which, most probably, correspond to two different magnetic exchange interactions, as in the case of PMC. Taken together, the low-temperature electronic absorption and the EPR spectra of BLC compound I formed in the 0.04-15 s range show that the porphyrin pi-cation radical disappears and, instead, a tyrosyl radical is formed. ENDOR experiments confirm our previously estimated hyperfine couplings to the C2,6 and C3,5 ring protons and the beta-methylene protons of the purported tyrosyl radical. Candidates for such a tyrosyl radical are discussed in connection with the possible electron transfer pathways between the heme active site and the NADPH cofactor.
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Affiliation(s)
- A Ivancich
- Département de Recherche Fondamentale sur la Matière Condensée, SCIB/SCPM, F-38054 Grenoble, France.
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79
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Sun L, Berglund H, Davydov R, Norrby T, Hammarström L, Korall P, Börje A, Philouze C, Berg K, Tran A, Andersson M, Stenhagen G, Mårtensson J, Almgren M, Styring S, Åkermark B. Binuclear Ruthenium−Manganese Complexes as Simple Artificial Models for Photosystem II in Green Plants. J Am Chem Soc 1997. [DOI: 10.1021/ja962511k] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Licheng Sun
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Helena Berglund
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Roman Davydov
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Thomas Norrby
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Leif Hammarström
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Peter Korall
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Anna Börje
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Christian Philouze
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Katja Berg
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Anh Tran
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Michael Andersson
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Gunnar Stenhagen
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Jerker Mårtensson
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Mats Almgren
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Stenbjörn Styring
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Björn Åkermark
- Contribution from the Department of Chemistry, Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Department of Physical Chemistry, Uppsala University, P.O. Box 532, S-751 21 Uppsala, Sweden, Department of Biochemistry, Center for Chemistry and Chemical Engineering, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden, and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
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80
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Rotello VM. Modification of Spin Density Distribution via Specific Hydrogen Bond Interactions: An Experimental, UHF, and Density Functional Study. J Am Chem Soc 1997. [DOI: 10.1021/ja970801a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vincent M. Rotello
- Contribution from the Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
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81
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Ribonucleotide reductases — a group of enzymes with different metallosites and a similar reaction mechanism. METAL SITES IN PROTEINS AND MODELS 1997. [DOI: 10.1007/3-540-62870-3_5] [Citation(s) in RCA: 128] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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82
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Ivancich A, Jouve HM, Gaillard J. EPR Evidence for a Tyrosyl Radical Intermediate in Bovine Liver Catalase. J Am Chem Soc 1996. [DOI: 10.1021/ja9628361] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anabella Ivancich
- CEA-Grenoble, DRFMC, SCIB, Spectroscopie de Complexes Polymétalliques et de Métalloprotéines 17 Ave. des Martyrs, F-38054 Grenoble, France Institut de Biologie Structurale Jean-Pierre Ebel CEA-CNRS, 41 Ave. des Martyrs, F-38027 Grenoble, France
| | - Hélène Marie Jouve
- CEA-Grenoble, DRFMC, SCIB, Spectroscopie de Complexes Polymétalliques et de Métalloprotéines 17 Ave. des Martyrs, F-38054 Grenoble, France Institut de Biologie Structurale Jean-Pierre Ebel CEA-CNRS, 41 Ave. des Martyrs, F-38027 Grenoble, France
| | - Jacques Gaillard
- CEA-Grenoble, DRFMC, SCIB, Spectroscopie de Complexes Polymétalliques et de Métalloprotéines 17 Ave. des Martyrs, F-38054 Grenoble, France Institut de Biologie Structurale Jean-Pierre Ebel CEA-CNRS, 41 Ave. des Martyrs, F-38027 Grenoble, France
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83
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Wallar BJ, Lipscomb JD. Dioxygen Activation by Enzymes Containing Binuclear Non-Heme Iron Clusters. Chem Rev 1996; 96:2625-2658. [PMID: 11848839 DOI: 10.1021/cr9500489] [Citation(s) in RCA: 977] [Impact Index Per Article: 34.9] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bradley J. Wallar
- Department of Biochemistry, Medical School, 4-225 Millard Hall, University of Minnesota, Minneapolis, Minnesota 55455
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84
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Schmidt PP, Andersson KK, Barra AL, Thelander L, Gräslund A. High field EPR studies of mouse ribonucleotide reductase indicate hydrogen bonding of the tyrosyl radical. J Biol Chem 1996; 271:23615-8. [PMID: 8798575 DOI: 10.1074/jbc.271.39.23615] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Ribonucleotide reductase catalyzes by free radical chemistry the reduction of ribonucleotides to deoxyribonucleotides. The R2 protein of a class 1 ribonucleotide reductase contains a stable tyrosyl radical of neutral phenoxy character, which is necessary for normal enzymatic activity. Here we present the EPR spectra from the tyrosyl free radical in the R2 protein from mouse at 9.62, 115, and 245 GHz. We show that the g-value anisotropy of the mouse R2 radical, when precisely determined from high field EPR spectra, is similar to that of the hydrogen bonded dark stable YD middle dot tyrosyl radical of photosystem II and different from that of the Escherichia coli R2 radical. Because the g-value anisotropy is an important indicator of the hydrogen bonding status of the tyrosyl radical, this result suggests that the mouse R2 radical has its tyrosylate oxygen hydrogen bonded with a D2O exchangeable proton, whereas this hydrogen bond is absent in the E. coli enzyme. It is suggested that the observed proton may be derived from the tyrosine that will become a tyrosyl radical.
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Affiliation(s)
- P P Schmidt
- Department of Biophysics, Arrhenius Laboratories, Stockholm University, S-106 91 Stockholm, Sweden
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