2301
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Hughes JL, Prince BJ, Krausz E, Smith PJ, Pace RJ, Riesen H. Highly Efficient Spectral Hole-Burning in Oxygen-Evolving Photosystem II Preparations. J Phys Chem B 2004. [DOI: 10.1021/jp0492523] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joseph L. Hughes
- Research School of Chemistry, The Australian National University, Canberra ACT 0200, Australia, Faculties Chemistry, The Australian National University, Canberra ACT 0200, Australia, and School of Physical, Environmental and Mathematical Sciences, University College, The University of New South Wales, ADFA, Canberra ACT 2600, Australia
| | - Barry J. Prince
- Research School of Chemistry, The Australian National University, Canberra ACT 0200, Australia, Faculties Chemistry, The Australian National University, Canberra ACT 0200, Australia, and School of Physical, Environmental and Mathematical Sciences, University College, The University of New South Wales, ADFA, Canberra ACT 2600, Australia
| | - Elmars Krausz
- Research School of Chemistry, The Australian National University, Canberra ACT 0200, Australia, Faculties Chemistry, The Australian National University, Canberra ACT 0200, Australia, and School of Physical, Environmental and Mathematical Sciences, University College, The University of New South Wales, ADFA, Canberra ACT 2600, Australia
| | - Paul J. Smith
- Research School of Chemistry, The Australian National University, Canberra ACT 0200, Australia, Faculties Chemistry, The Australian National University, Canberra ACT 0200, Australia, and School of Physical, Environmental and Mathematical Sciences, University College, The University of New South Wales, ADFA, Canberra ACT 2600, Australia
| | - Ron J. Pace
- Research School of Chemistry, The Australian National University, Canberra ACT 0200, Australia, Faculties Chemistry, The Australian National University, Canberra ACT 0200, Australia, and School of Physical, Environmental and Mathematical Sciences, University College, The University of New South Wales, ADFA, Canberra ACT 2600, Australia
| | - Hans Riesen
- Research School of Chemistry, The Australian National University, Canberra ACT 0200, Australia, Faculties Chemistry, The Australian National University, Canberra ACT 0200, Australia, and School of Physical, Environmental and Mathematical Sciences, University College, The University of New South Wales, ADFA, Canberra ACT 2600, Australia
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2302
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Hureau C, Blanchard S, Nierlich M, Blain G, Rivière E, Girerd JJ, Anxolabéhère-Mallart E, Blondin G. Controlled Redox Conversion of New X-ray-Characterized Mono- and Dinuclear Heptacoordinated Mn(II) Complexes into Di-μ-oxo-dimanganese Core Complexes. Inorg Chem 2004; 43:4415-26. [PMID: 15236555 DOI: 10.1021/ic035332u] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two heptacoordinated Mn(II) complexes are isolated and X-ray characterized using the well-known tpen ligand (tpen = N,N,N',N'-tetrakis(2-pyridylmethyl)-1,2-ethanediamine): [(tpen)Mn(OH(2))](ClO(4))(2) (1(ClO(4))(2)) and [(tpen)Mn(micro-OAc)Mn(tpen)](ClO(4))(3).2H(2)O (2(ClO(4))(3).2H(2)O). Crystallographic data for 1(ClO(4))(2) at 110(2) K (respectively at 293(2) K): monoclinic, space group C2/c, a = 15.049(3) A (15.096(3) A), b = 9.932(2) A (10.105(2) A), c = 19.246(4) A (19.443(4) A), beta = 94.21(3) degrees (94.50(3) degrees ), Z = 4. Crystallographic data for 2(ClO(4))(3).0.5(C(2)H(5))(2)O at 123(2) K: triclinic, space group P, a = 12.707(3) A, b = 12.824(3) A, c = 19.052(4) A, alpha = 102.71(3) degrees, beta = 97.83(3) degrees, gamma = 98.15(3) degrees, Z = 2. Investigation of the variation upon temperature of the molar magnetic susceptibility of compound 2(ClO(4))(3).2H(2)O reveals a weak antiferromagnetic exchange interaction between the two high-spin Mn(II) ions (J = -0.65 +/- 0.05 cm(-)(1), H = -JS(1).S(2)). EPR spectra are recorded on powder samples and on frozen acetonitrile solutions, demonstrating the maintenance upon dissolution of the heptacoordination of Mn in complex 1 while complex 2 partially dissociates. Electrochemical responses of complexes 1 and 2 are investigated in acetonitrile, and bulk electrolyses are performed at oxidative potential in the presence of various amounts of 2,6-lutidine (0-2.65 equiv per Mn ion). The formation from either 1 or 2 of the mixed-valent complex [(tpen)Mn(III)(micro-O)(2)Mn(IV)(tpen)](3+) (3) is established from mass spectrometry and EPR and IR spectroscopy measurements. When reaction is started from 2, formation of [(tpen)Mn(IV)(micro-O)(2)(micro-OAc)Mn(IV)](3+) (4) is evidenced from cyclic voltammetry, EPR, and UV-vis data. The Mn vs tpen ratio in the electrogenerated complexes is accurately controlled by the quantity of additional 2,6-lutidine. The role of tpen as a base is discussed.
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Affiliation(s)
- Christelle Hureau
- Laboratoire de Chimie Inorganique, UMR 8613, LCR-CEA n degrees 33V, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, 91405 Orsay Cedex, France
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2303
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Boussac A, Rappaport F, Carrier P, Verbavatz JM, Gobin R, Kirilovsky D, Rutherford AW, Sugiura M. Biosynthetic Ca2+/Sr2+ Exchange in the Photosystem II Oxygen-evolving Enzyme of Thermosynechococcus elongatus. J Biol Chem 2004; 279:22809-19. [PMID: 14990562 DOI: 10.1074/jbc.m401677200] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The thermophilic cyanobacterium, Thermosynechococcus elongatus, has been grown in the presence of Sr2+ instead of Ca2+ with the aim of biosynthetically replacing the Ca2+ of the oxygen-evolving enzyme with Sr2+. Not only were the cells able to grow normally with Sr2+, they actively accumulated the ion to levels higher than those of Ca2+ in the normal cultures. A protocol was developed to purify a fully active Sr(2+)-containing photosystem II (PSII). The modified enzyme contained a normal polypeptide profile and 1 strontium/4 manganese, indicating that the normal enzyme contains 1 calcium/4 manganese. The Sr(2+)- and Ca(2+)-containing enzymes were compared using EPR spectroscopy, UV-visible absorption spectroscopy, and O2 polarography. The Ca2+/Sr2+ exchange resulted in the modification of the EPR spectrum of the manganese cluster and a slower turnover of the redox cycle (the so-called S-state cycle), resulting in diminished O2 evolution activity under continuous saturating light: all features reported previously by biochemical Ca2+/Sr2+ exchange in plant PSII. This allays doubts that these changes could be because of secondary effects induced by the biochemical treatments themselves. In addition, the Sr(2+)-containing PSII has other kinetics modifications: 1) it has an increased stability of the S3 redox state; 2) it shows an increase in the rate of electron donation from TyrD, the redox-active tyrosine of the D2 protein, to the oxygen-evolving complex in the S3-state forming S2; 3) the rate of oxidation of the S0-state to the S1-state by TyrD* is increased; and 4) the release of O2 is slowed down to an extent similar to that seen for the slowdown of the S3TyrZ* to S0TyrZ transition, consistent with the latter constituting the limiting step of the water oxidation mechanism in Sr(2+)-substituted enzyme as well as in the normal enzyme. The replacement of Ca2+ by Sr2+ appears to have multiple effects on kinetics properties of the enzyme that may be explained by S-state-dependent shifts in the redox properties of both the manganese complex and TyrZ as well as structural effects.
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Affiliation(s)
- Alain Boussac
- Service de Bioénergétique, DBJC, URA CNRS 2096, CEA Saclay, 91191 Gif sur Yvette, France.
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2304
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Pujols-Ayala I, Barry BA. Tyrosyl radicals in Photosystem II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2004; 1655:205-16. [PMID: 15100033 DOI: 10.1016/j.bbabio.2003.07.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2003] [Revised: 07/31/2003] [Accepted: 07/31/2003] [Indexed: 11/23/2022]
Abstract
In PSII, there are two redox-active tyrosines, D and Z, with different midpoint potentials and different reduction kinetics. The factors responsible for these functional differences have not yet been elucidated. Recent model compound studies of tyrosinate and of tyrosine-containing dipeptides have demonstrated that perturbations of the amino and amide/imide group occur when the tyrosyl aromatic ring is oxidized [J. Am. Chem. Soc. 124 (2002) 5496]. Accompanying density functional calculations suggested that this perturbation is due to spin density delocalization from the aromatic ring onto the amino nitrogen. The implication of this finding is that spin density delocalization may occur in redox-active, tyrosine-containing enzymes, like Photosystem II. In this paper, we review the supporting evidence for the hypothesis that tyrosyl radical spin density delocalizes into the peptide bond in a conformationally sensitive, sequence-dependent manner. Our experimental measurements on tyrosyl radicals in dipeptides have suggested that the magnitude of the putative spin migration may be sequence-dependent. Vibrational spectroscopic studies on the tyrosyl radicals in Photosystem II, which are consistent with spin migration, are reviewed. Migration of the unpaired spin may provide a mechanism for control of the direction and possibly the rate of electron transfer.
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Affiliation(s)
- Idelisa Pujols-Ayala
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, 1479 Gortner Ave., St. Paul, MN 55108, USA
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2305
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Affiliation(s)
- Michael R Jones
- Department of Biochemistry, School of Medical Sciences, University of Bristol, University Walk, Bristol BS8 1TD, UK
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2306
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Affiliation(s)
- A W Rutherford
- Service of Bioenergetics, CNRS URA 2096, Département de Biologie Joliot Curie, CEA Saclay, 91191 Gif-sur-Yvette, France.
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2307
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Petrie S, Mukhopadhyay S, Armstrong WH, Stranger R. Theoretical analysis of the [Mn2(μ-oxo)2(μ-carboxylato)2]+core. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407512a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2308
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Burnap RL. D1 protein processing and Mn cluster assembly in light of the emerging Photosystem II structure. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407094a] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2309
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Kühn P, Eckert HJ, Eichler HJ, Renger G. Analysis of the P680+˙ reduction pattern and its temperature dependence in oxygen-evolving PS II core complexes from thermophilic cyanobacteria and higher plants. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407656g] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2310
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Kuntzleman T, McCarrick R, Penner-Hahn J, Yocum C. Probing reactive sites within the Photosystem II manganese cluster: Evidence for separate populations of manganese that differ in redox potential. Phys Chem Chem Phys 2004. [DOI: 10.1039/b406601d] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2311
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Lundberg M, Siegbahn PEM. Theoretical investigations of structure and mechanism of the oxygen-evolving complex in PSII. Phys Chem Chem Phys 2004. [DOI: 10.1039/b406552b] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2312
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2313
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Andrizhiyevskaya EG, Frolov D, van Grondelle R, Dekker JP. On the role of the CP47 core antenna in the energy transfer and trapping dynamics of Photosystem II. Phys Chem Chem Phys 2004. [DOI: 10.1039/b411977k] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2314
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Grotjohann I, Jolley C, Fromme P. Evolution of photosynthesis and oxygen evolution: Implications from the structural comparison of Photosystems I and II. Phys Chem Chem Phys 2004. [DOI: 10.1039/b408980d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2315
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DasguptaThese authors contributed e J, van Willigen RT, Dismukes GC. Consequences of structural and biophysical studies for the molecular mechanism of photosynthetic oxygen evolution: functional roles for calcium and bicarbonate. Phys Chem Chem Phys 2004. [DOI: 10.1039/b408270b] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2316
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Pizarro SA, Glatzel P, Visser H, Robblee JH, Christou G, Bergmann U, Yachandra VK. Mn oxidation states in tri- and tetra-nuclear Mn compounds structurally relevant to photosystem II: Mn K-edge X-ray absorption and Kβ X-ray emission spectroscopy studies. Phys Chem Chem Phys 2004; 6:4864-4870. [PMID: 25383041 PMCID: PMC4224298 DOI: 10.1039/b407513g] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
X-Ray spectroscopy is used to examine the effect of the manganese oxidation state for a series of Mn model compounds. Sensitive to Mn oxidation and structural symmetry, X-ray absorption and emission spectroscopy (XAS and XES) provide complementary insights. However, few benchmark examples of complexes with similar structures but in different oxidation states are available to evaluate data from unknown structures like the oxygen evolving complex (OEC) of Photosystem II (PSII). This study examines two types of compounds prepared in a variety of Mn oxidation states and which possess chemical structures with Mn-Mn interactions (~2.7 Å and ~3.3 Å) that have been observed in the OEC. Model complexes with core compositions Mn3O and Mn4O2 contain combinations of Mn in either a reduced (II) or oxidized (III) state. Within each set of compounds, complexes with higher Mn oxidation states have absorption K-edge energy values that are higher (1.6-2.2 eV) than those of their more reduced counterparts. This trend is accordingly reversed in the Kβ emission spectroscopy where the first moment energy values are lower (0.09-0.12 eV) for compounds with higher Mn oxidation states. We will discuss in detail, how these trends can be quantitatively used to characterize the effects of the Mn oxidation state as well as the surrounding ligand environment on the observed X-ray spectra. The results are discussed with respect to previously obtained data on different S-states of the OEC.
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Affiliation(s)
- Shelly A. Pizarro
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. Fax: +1 (510) 486-6059; Tel: +1 (510) 486-4330
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Pieter Glatzel
- Department of Inorganic Chemistry and Catalysis, Utrecht University, 3584 CA Utrecht, The Netherlands
| | - Hendrik Visser
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. Fax: +1 (510) 486-6059; Tel: +1 (510) 486-4330
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - John H. Robblee
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. Fax: +1 (510) 486-6059; Tel: +1 (510) 486-4330
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Uwe Bergmann
- The Stanford Synchrotron Radiation Laboratory, 2575 Sand Hill Rd, Menlo Park, CA 94025, USA. Fax: +1 (650) 926-3600; Tel: +1 (650) 926-3048
| | - Vittal K. Yachandra
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. Fax: +1 (510) 486-6059; Tel: +1 (510) 486-4330
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2317
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Messinger J. Evaluation of different mechanistic proposals for water oxidation in photosynthesis on the basis of Mn4OxCa structures for the catalytic site and spectroscopic data. Phys Chem Chem Phys 2004. [DOI: 10.1039/b406437b] [Citation(s) in RCA: 165] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2318
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Fritscher J. Influence of hydrogen bond geometry on quadrupole coupling parameters: A theoretical study of imidazole–water and imidazole–semiquinone complexes. Phys Chem Chem Phys 2004. [DOI: 10.1039/b408764j] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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2319
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Munk VP, Sadler PJ. Palladium(ii) diamine complex induces reduction of glutathione disulfide. Chem Commun (Camb) 2004:1788-9. [PMID: 15306884 DOI: 10.1039/b408151j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of [Pd(1R,2R-diaminocyclohexane)Cl(2)] with the oxidised form of the tripeptide glutathione ([gamma]-l-glutamyl-l-cysteinyl-glycine) in aqueous solution leads to reductive cleavage of the disulfide bond.
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Affiliation(s)
- Vivienne P Munk
- School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh, UK
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2320
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Dau H, Liebisch P, Haumann M. The structure of the manganese complex of Photosystem II in its dark-stable S1-state—EXAFS results in relation to recent crystallographic data. Phys Chem Chem Phys 2004. [DOI: 10.1039/b408146c] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2321
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Cuni A, Xiong L, Sayre R, Rappaport F, Lavergne J. Modification of the pheophytin midpoint potential in photosystem II: Modulation of the quantum yield of charge separation and of charge recombination pathways. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407511k] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2322
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Koulougliotis D, Teutloff C, Sanakis Y, Lubitz W, Petrouleas V. The S1YZ? metalloradical intermediate in photosystem II: an X- and W-band EPR study. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407355j] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2323
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Nowaczyk M, Berghaus C, Stoll R, Rögner M. Preliminary structural characterisation of the 33 kDa protein (PsbO) in solution studied by site-directed mutagenesis and NMR spectroscopy. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407316a] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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2324
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Barber J, Ferreira K, Maghlaoui K, Iwata S. Structural model of the oxygen-evolving centre of photosystem II with mechanistic implications. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407981g] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2325
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Kozlov YN, Zharmukhamedov SK, Tikhonov KG, Dasgupta J, Kazakova AA, Charles Dismukes G, Klimov VV. Oxidation potentials and electron donation to photosystem II of manganese complexes containing bicarbonate and carboxylate ligands. Phys Chem Chem Phys 2004. [DOI: 10.1039/b406569g] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2326
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Minagawa J, Takahashi Y. Structure, function and assembly of Photosystem II and its light-harvesting proteins. PHOTOSYNTHESIS RESEARCH 2004; 82:241-63. [PMID: 16143838 DOI: 10.1007/s11120-004-2079-2] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2003] [Accepted: 07/19/2004] [Indexed: 05/02/2023]
Abstract
Photosystem II (PSII) is a multisubunit chlorophyll-protein complex that drives electron transfer from water to plastoquinone using energy derived from light. In green plants, the native form of PSII is surrounded by the light-harvesting complex (LHCII complex) and thus it is called the PSII-LHCII supercomplex. Over the past several years, understanding of the structure, function, and assembly of PSII and LHCII complexes has increased considerably. The unicellular green alga Chlamydomonas reinhardtii has been an excellent model organism to study PSII and LHCII complexes, because this organism grows heterotrophically and photoautotrophically and it is amenable to biochemical, genetic, molecular biological and recombinant DNA methodology. Here, the genes encoding and regulating components of the C. reinhardtii PSII-LHCII supercomplex have been thoroughly catalogued: they include 15 chloroplast and 20 nuclear structural genes as well as 13 nuclear genes coding for regulatory factors. This review discusses these molecular genetic data and presents an overview of the structure, function and assembly of PSII and LHCII complexes.
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Affiliation(s)
- Jun Minagawa
- Institute of Low Temperature Science, Hokkaido University, N19 W8, Sapporo, 060-0819, Japan,
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2327
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McEvoy JP, Brudvig GW. Structure-based mechanism of photosynthetic water oxidation. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407500e] [Citation(s) in RCA: 174] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2328
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van Mourik F, Groot ML, van Grondelle R, Dekker JP, van Stokkum IH. Global and target analysis of fluorescence measurements on photosystem 2 reaction centers upon red excitation. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407633h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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2329
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Hughes JL, Prince BJ, Peterson Årsköld S, Smith PJ, Pace RJ, Riesen H, Krausz E. The Native Reaction Centre of Photosystem II: A New Paradigm for P680. Aust J Chem 2004. [DOI: 10.1071/ch04140] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Low-temperature spectra of fully active (oxygen-evolving) Photosystem II (PSII) cores prepared from spinach exhibit well developed structure. Spectra of isolated sub-fragments of PSII cores establish that the native reaction centre is better structured and red-shifted compared to the isolated reaction centre. Laser illumination of PSII cores leads to efficient and deep spectral hole-burning. Measurements of homogeneous hole-widths establish excited-state lifetimes in the 40–300 ps range. The high hole-burning efficiency is attributed to charge separation of P680 in native PSII that follows reaction-centre excitation via ‘slow transfer’ states in the inner light-harvesting assemblies CP43 and CP47. The ‘slow transfer’ state in CP47 and that in CP43 can be distinguished in the hole-burning action spectrum and high-resolution hole-burning spectra. An important observation is that 685–700 nm illumination gives rise to efficient P680 charge separation, as established by QA− formation. This leads to a new paradigm for P680. The charge-separating state has surprisingly weak absorption and extends to 700 nm.
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2330
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Biesiadka J, Loll B, Kern J, Irrgang KD, Zouni A. Crystal structure of cyanobacterial photosystem II at 3.2 Å resolution: a closer look at the Mn-cluster. Phys Chem Chem Phys 2004. [DOI: 10.1039/b406989g] [Citation(s) in RCA: 232] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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2331
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Sicora C, Wiklund R, Jansson C, Vass I. Charge stabilization and recombination in Photosystem II containing the D1′ protein product of the psbA1 gene in Synechocystis 6803. Phys Chem Chem Phys 2004. [DOI: 10.1039/b406695b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2332
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Hillier W, Wydrzynski T. Substrate water interactions within the Photosystem II oxygen evolving complex. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407269c] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2333
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Diner BA, Bautista JA, Nixon PJ, Berthomieu C, Hienerwadel R, Britt RD, Vermaas WFJ, Chisholm DA. Coordination of proton and electron transfer from the redox-active tyrosine, YZ, of Photosystem II and examination of the electrostatic influence of oxidized tyrosine, YD˙(H+). Phys Chem Chem Phys 2004. [DOI: 10.1039/b407423h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2334
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Sjödin M, Ghanem R, Polivka T, Pan J, Styring S, Sun L, Sundström V, Hammarström L. Tuning proton coupled electron transfer from tyrosine: A competition between concerted and step-wise mechanisms. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407383e] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mamedov F, Smith PJ, Styring S, Pace RJ. Relaxation behaviour of the tyrosine YD radical in photosystem II: evidence for strong dipolar interaction with paramagnetic centers in the S1 and S2 states. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407329k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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