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Odahara T, Odahara Y. Association of protein–detergent particles in the presence of polymers comprised of different degrees of polymerization of oxyethylene subunits. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2
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Kaminskaya OP, Semenov AY. The Mechanisms of Electrogenic Reactions in Bacterial Photosynthetic Reaction Centers: Studies in Collaboration with Alexander Konstantinov. BIOCHEMISTRY (MOSCOW) 2021; 86:1-7. [PMID: 33705277 DOI: 10.1134/s0006297921010016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this review, we discuss our studies conducted in 1985-1988 in collaboration with A. A. Konstantinov, one of the top scientists in the field of membrane bioenergetics. Studying fast kinetics of membrane potential generation in photosynthetic reaction centers (RCs) of purple bacteria in response to a laser flash has made it possible to examine in detail the mechanisms of electrogenic reactions at the donor and acceptor sides of RCs. Electrogenesis associated with the intraprotein electron transfer from the exogenous secondary donors, redox dyes, and soluble cytochrome (cyt) c to the photooxidized dimer of bacteriochlorophyll P870 was studied using proteoliposomes containing RCs from the non-sulfur purple bacterium Rhodospirillum rubrum. It was found that reduction of the secondary quinone electron acceptor QB accompanied by its protonation in the chromatophores from R. rubrum in response to every second light flash was electrogenic. Spectral characteristics and redox potentials of the four hemes in the tightly bound cyt c in the RC of Blastochloris viridis and electrogenic reactions associated with the electron transfer within the RC complex were identified. For the first time, relative amplitudes of the membrane potential generated in the course of individual electrogenic reactions were compared with the distances between the redox cofactors determined based on the three-dimensional structure of the Bl. viridis RC.
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Affiliation(s)
- Olga P Kaminskaya
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Alexey Yu Semenov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia. .,Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia
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Odahara T, Odahara K. Various salts employed as precipitant in combination with polyethylene glycol in protein/detergent particle association. Heliyon 2019; 4:e01073. [PMID: 30603706 PMCID: PMC6307348 DOI: 10.1016/j.heliyon.2018.e01073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 11/27/2018] [Accepted: 12/17/2018] [Indexed: 11/29/2022] Open
Abstract
Salt/polyethylene glycol (PEG) mixtures are employed as precipitants for biological macromolecules. The dependence of precipitation curves (PCs) on salt species was investigated for integral membrane protein/detergent particles. By relating this dependence to properties of ions dissociated from added salts, the following roles and effects of various ions were clarified. In the presence of ions whose interaction with water is stronger than water-water interaction, the coordination of solvent molecules is rearranged so as to strengthen short-range steric repulsion and hydrophobic attraction. Ions whose interaction with water is weaker than water-water interaction can be a hindrance to hydrophobic-hydrophobic contact. Moreover, strong electric fields of divalent cations can cause an attractive effect between electronegative or polar groups of neighboring particles. The variations of particle-particle and particle-PEG interactions depending on the state of particles and surrounding solvents were correlative. Due to this, the relationship between the horizontal positions of PC and the species of salts added could be formulated as a binary linear function of cationic and anionic species composing the salts.
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Affiliation(s)
- Takayuki Odahara
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central-6, 1-1 Higashi, Tsukuba, Ibaraki, 305-8566 Japan
| | - Koji Odahara
- Fukuoka Prefectural Association of Agricultural Production and Materials, Fukuoka Prefectural Office, Hakata, Fukuoka, 812-8577 Japan
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4
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Odahara T, Odahara K. Intermolecular interactions at early stage of protein/detergent particle association induced by salt/polyethylene glycol mixtures. Protein Expr Purif 2015; 120:72-86. [PMID: 26705098 DOI: 10.1016/j.pep.2015.12.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 12/07/2015] [Accepted: 12/11/2015] [Indexed: 11/26/2022]
Abstract
Mixtures of neutral salts and polyethylene glycol are used for various purposes in biological studies. Although the effects of each component of the mixtures are theoretically well investigated, comprehension of their integrated effects remains insufficient. In this work, their roles and effects as a precipitant were clarified by studying dependence of precipitation curves on salt concentration for integral membrane protein/detergent particles of different physicochemical properties. The dependence of precipitation curves was reasonably related to intermolecular interactions among relevant molecules such as protein, detergent and polyethylene glycol by considering their physicochemical properties. The obtained relationships are useful as basic information to learn the early stage of biological macromolecular associations.
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Affiliation(s)
- Takayuki Odahara
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central-6, 1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan.
| | - Koji Odahara
- Fukuoka Agriculture and Forestry Research Center, Chikusino, Fukuoka, 818-8549, Japan
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Arnlund D, Johansson LC, Wickstrand C, Barty A, Williams GJ, Malmerberg E, Davidsson J, Milathianaki D, DePonte DP, Shoeman RL, Wang D, James D, Katona G, Westenhoff S, White TA, Aquila A, Bari S, Berntsen P, Bogan M, van Driel TB, Doak RB, Kjær KS, Frank M, Fromme R, Grotjohann I, Henning R, Hunter MS, Kirian RA, Kosheleva I, Kupitz C, Liang M, Martin AV, Nielsen MM, Messerschmidt M, Seibert MM, Sjöhamn J, Stellato F, Weierstall U, Zatsepin NA, Spence JCH, Fromme P, Schlichting I, Boutet S, Groenhof G, Chapman HN, Neutze R. Visualizing a protein quake with time-resolved X-ray scattering at a free-electron laser. Nat Methods 2014; 11:923-6. [PMID: 25108686 DOI: 10.1038/nmeth.3067] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 07/09/2014] [Indexed: 01/07/2023]
Abstract
We describe a method to measure ultrafast protein structural changes using time-resolved wide-angle X-ray scattering at an X-ray free-electron laser. We demonstrated this approach using multiphoton excitation of the Blastochloris viridis photosynthetic reaction center, observing an ultrafast global conformational change that arises within picoseconds and precedes the propagation of heat through the protein. This provides direct structural evidence for a 'protein quake': the hypothesis that proteins rapidly dissipate energy through quake-like structural motions.
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Affiliation(s)
- David Arnlund
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Linda C Johansson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Cecilia Wickstrand
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Anton Barty
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Garth J Williams
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | - Erik Malmerberg
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Jan Davidsson
- Department of Chemistry - Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Despina Milathianaki
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | - Daniel P DePonte
- 1] Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany. [2] Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | - Robert L Shoeman
- 1] Max-Planck-Institut für medizinische Forschung, Heidelberg, Germany. [2] Max Planck Advanced Study Group, Center for Free-Electron Laser Science, Hamburg, Germany
| | - Dingjie Wang
- Department of Physics, Arizona State University, Tempe, Arizona, USA
| | - Daniel James
- Department of Physics, Arizona State University, Tempe, Arizona, USA
| | - Gergely Katona
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Thomas A White
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Andrew Aquila
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Sadia Bari
- 1] Max Planck Advanced Study Group, Center for Free-Electron Laser Science, Hamburg, Germany. [2] Max-Planck-Institut für Kernphysik, Heidelberg, Germany
| | - Peter Berntsen
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Mike Bogan
- PULSE Institute for Ultrafast Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | | | - R Bruce Doak
- 1] Max-Planck-Institut für medizinische Forschung, Heidelberg, Germany. [2] Department of Physics, Arizona State University, Tempe, Arizona, USA
| | - Kasper Skov Kjær
- 1] Department of Physics, Technical University of Denmark, Lyngby, Denmark. [2] Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
| | - Matthias Frank
- Lawrence Livermore National Laboratory, Livermore, California, USA
| | - Raimund Fromme
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, USA
| | - Ingo Grotjohann
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, USA
| | | | - Mark S Hunter
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, USA
| | - Richard A Kirian
- Department of Physics, Arizona State University, Tempe, Arizona, USA
| | | | - Christopher Kupitz
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, USA
| | - Mengning Liang
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Andrew V Martin
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | | | - Marc Messerschmidt
- 1] Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany. [2] Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | - M Marvin Seibert
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | - Jennie Sjöhamn
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Francesco Stellato
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Uwe Weierstall
- Department of Physics, Arizona State University, Tempe, Arizona, USA
| | - Nadia A Zatsepin
- Department of Physics, Arizona State University, Tempe, Arizona, USA
| | - John C H Spence
- Department of Physics, Arizona State University, Tempe, Arizona, USA
| | - Petra Fromme
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, USA
| | - Ilme Schlichting
- 1] Max-Planck-Institut für medizinische Forschung, Heidelberg, Germany. [2] Max Planck Advanced Study Group, Center for Free-Electron Laser Science, Hamburg, Germany
| | - Sébastien Boutet
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | - Gerrit Groenhof
- 1] Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland. [2] Department of Chemistry, University of Jyväskylä, Jyväskylä, Finland
| | - Henry N Chapman
- 1] Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany. [2] Department of Physics, University of Hamburg, Hamburg, Germany. [3] Centre for Ultrafast Imaging, Hamburg, Germany
| | - Richard Neutze
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
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Reimers JR, Hush NS, Crossley MJ. Inter-porphyrin coupling: how strong should it be for molecular electronics applications? J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424602000919] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Porphyrins and phthalocyanines have now been assembled in a multitude of different architectures, each of which may be identified with a different scenario of the coupling acting between the porphyrins. The synthetic flexibility of these compounds makes possible the design of particular molecules for specific applications in molecular electronics, both in naturally occurring and synthetic devices. Here, we form an overview of these features and focus on the coupling strength, considering what values are appropriate for different molecular electronics applications. In particular, we focus on model compounds that have been prepared as mimics of naturally occurring photosynthetic functional units, oligoporphyrins molecular wires, and stacked systems in which small changes in geometry can affect significant changes in the inter-porphyrin coupling and hence produce dramatic changes in device properties.
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Affiliation(s)
| | - Noel S. Hush
- School of Chemistry, The University of Sydney, NSW 2006, Australia
- School of Molecular and Microbial Biosciences, The University of Sydney, NSW 2006, Australia
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Odahara T, Ishii N, Ooishi A, Honda S, Uedaira H, Hara M, Miyake J. Thermostability of Rhodopseudomonas viridis and Rhodospirillum rubrum chromatophores reflecting physiological conditions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:1645-53. [DOI: 10.1016/j.bbamem.2011.02.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Revised: 01/24/2011] [Accepted: 02/15/2011] [Indexed: 11/29/2022]
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8
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Collins AM, Kirmaier C, Holten D, Blankenship RE. Kinetics and energetics of electron transfer in reaction centers of the photosynthetic bacterium Roseiflexus castenholzii. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2010; 1807:262-9. [PMID: 21126505 DOI: 10.1016/j.bbabio.2010.11.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 11/18/2010] [Accepted: 11/19/2010] [Indexed: 10/18/2022]
Abstract
The kinetics and thermodynamics of the photochemical reactions of the purified reaction center (RC)-cytochrome (Cyt) complex from the chlorosome-lacking, filamentous anoxygenic phototroph, Roseiflexus castenholzii are presented. The RC consists of L- and M-polypeptides containing three bacteriochlorophyll (BChl), three bacteriopheophytin (BPh) and two quinones (Q(A) and Q(B)), and the Cyt is a tetraheme subunit. Two of the BChls form a dimer P that is the primary electron donor. At 285K, the lifetimes of the excited singlet state, P*, and the charge-separated state P(+)H(A)(-) (where H(A) is the photoactive BPh) were found to be 3.2±0.3 ps and 200±20 ps, respectively. Overall charge separation P*→→ P(+)Q(A)(-) occurred with ≥90% yield at 285K. At 77K, the P* lifetime was somewhat shorter and the P(+)H(A)(-) lifetime was essentially unchanged. Poteniometric titrations gave a P(865)/P(865)(+) midpoint potential of +390mV vs. SHE. For the tetraheme Cyt two distinct midpoint potentials of +85 and +265mV were measured, likely reflecting a pair of low-potential hemes and a pair of high-potential hemes, respectively. The time course of electron transfer from reduced Cyt to P(+) suggests an arrangement where the highest potential heme is not located immediately adjacent to P. Comparisons of these and other properties of isolated Roseiflexus castenholzii RCs to those from its close relative Chloroflexus aurantiacus and to RCs from the purple bacteria are made.
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Affiliation(s)
- Aaron M Collins
- Department of Chemistry, Washington University in St. Louis, St. Louis, MO 63130, USA
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9
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Electronic structure of the primary electron donor of Blastochloris viridis heterodimer mutants: High-field EPR study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2010; 1797:1617-26. [DOI: 10.1016/j.bbabio.2010.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2009] [Revised: 05/18/2010] [Accepted: 06/04/2010] [Indexed: 11/22/2022]
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10
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Deisenhofer J, Michel H. The Photosynthetic Reaction Center from the Purple Bacterium Rhodopseudomonas viridis. Science 2010; 245:1463-73. [PMID: 17776797 DOI: 10.1126/science.245.4925.1463] [Citation(s) in RCA: 552] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The history and methods of membrane protein crystallization are described. The solution of the structure of the photosynthetic reaction center from the bacterium Rhodopseudomonas viridis is described, and the structure of this membrane protein complex is correlated with its function as a light-driven electron pump across the photosynthetic membrane. Conclusions about the structure of the photosystem II reaction center from plants are drawn, and aspects of membrane protein structure are discussed.
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11
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Tiede DM, Choquet Y, Breton J. Geometry for the Primary Electron Donor and the Bacteriopheophytin Acceptor in Rhodopseudomonas viridis Photosynthetic Reaction Centers. Biophys J 2010; 47:443-7. [PMID: 19431588 DOI: 10.1016/s0006-3495(85)83936-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The tetrapyrrole electron donors and acceptors (bacteriochlorophyll, BCh; bacteriopheophytin, BPh) within the bacterial photosynthetic reaction center (RC) are arranged with a specific geometry that permits rapid (picosecond time scale) electron tunneling to occur between them. Here we have measured the angle between the molecular planes of the bacteriochlorophyll dimer (primary donor), B(2), and the acceptor bacteriopheophytin, H, by analyzing the dichroism of the absorption change associated with H reduction, formed by photoselection with RCs of Rhodopseudomonas viridis. This angle between molecular planes is found to be 60 degrees +/- 2. This means that the ultrafast electron tunneling must occur between donors and acceptors that are fixed by the protein to have a noncoplanar alignment. Nearly perpendicular alignments have been determined for other electron tunneling complexes involving RCs. These geometries can be contrasted with models proposed for heme-heme electron transfer complexes, which have emphasized that mutually parallel orientations should permit the most kinetically facile transfers.
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12
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Kangur L, Timpmann K, Freiberg A. Stability of Integral Membrane Proteins under High Hydrostatic Pressure: The LH2 and LH3 Antenna Pigment−Protein Complexes from Photosynthetic Bacteria. J Phys Chem B 2008; 112:7948-55. [DOI: 10.1021/jp801943w] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liina Kangur
- Institute of Physics, University of Tartu, Riia 142, Tartu 51014, Estonia, and Institute of Molecular and Cell Biology, University of Tartu, Riia 23, Tartu 51010, Estonia
| | - Kõu Timpmann
- Institute of Physics, University of Tartu, Riia 142, Tartu 51014, Estonia, and Institute of Molecular and Cell Biology, University of Tartu, Riia 23, Tartu 51010, Estonia
| | - Arvi Freiberg
- Institute of Physics, University of Tartu, Riia 142, Tartu 51014, Estonia, and Institute of Molecular and Cell Biology, University of Tartu, Riia 23, Tartu 51010, Estonia
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13
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Medvedev ES, Kotelnikov AI, Barinov AV, Psikha BL, Ortega JM, Popović DM, Stuchebrukhov AA. Protein dynamics control of electron transfer in photosynthetic reaction centers from Rps. sulfoviridis. J Phys Chem B 2008; 112:3208-16. [PMID: 18284231 PMCID: PMC2855845 DOI: 10.1021/jp709924w] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the cycle of photosynthetic reaction centers, the initially oxidized special pair of bacteriochlorophyll molecules is subsequently reduced by an electron transferred over a chain of four hemes of the complex. Here, we examine the kinetics of electron transfer between the proximal heme c-559 of the chain and the oxidized special pair in the reaction center from Rps. sulfoviridis in the range of temperatures from 294 to 40 K. The experimental data were obtained for three redox states of the reaction center, in which one, two, or three nearest hemes of the chain are reduced prior to special pair oxidation. The experimental kinetic data are analyzed in terms of a Sumi-Marcus-type model developed in our previous paper,1 in which similar measurements were reported on the reaction centers from Rps. viridis. The model allows us to establish a connection between the observed nonexponential electron-transfer kinetics and the local structural relaxation dynamics of the reaction center protein on the microsecond time scale. The activation energy for relaxation dynamics of the protein medium has been found to be around 0.1 eV for all three redox states, which is in contrast to a value around 0.4-0.6 eV in Rps. viridis.1 The possible nature of the difference between the reaction centers from Rps. viridis and Rps. sulfoviridis, which are believed to be very similar, is discussed. The role of the protein glass transition at low temperatures and that of internal water molecules in the process are analyzed.
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Affiliation(s)
- E. S. Medvedev
- The Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
| | - A. I. Kotelnikov
- The Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
| | - A. V. Barinov
- The Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
| | - B. L. Psikha
- The Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
| | - J. M. Ortega
- Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla-CSIC, 41092 Seville, Spain
| | - D. M. Popović
- Department of Chemistry, University of California, Davis, California 95616
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Baxter RHG, Krausz E, Norris JR. Photoactivation of the photosynthetic reaction center of Blastochloris viridis in the crystalline state. J Phys Chem B 2006; 110:1026-32. [PMID: 16471638 DOI: 10.1021/jp053697p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photoactivation in crystals of the bacterial reaction center of Blastochloris viridis was investigated by near-infrared spectroscopy. The bleaching of the special pair absorption at 970 nm and the simultaneous rise of the special pair cation absorption at 1300 nm were measured in response to transient irradiation by a HeNe laser over 5 orders of magnitude in laser power. The resulting power-saturation curve can be used to estimate the true extent of photoactivation achieved in a prior time-resolved crystallographic experiment (Baxter et al. Proc. Natl. Acad. Sci. U.S.A. 2004, 101, 5982-5987). The overall extent of photoactivation was 50%, which demonstrates that the time-resolved crystallographic method can be applied to the optically dense reaction center crystals. Measurement of the charge-recombination rate, however, suggests the presence of a long-lived P+ state within the crystal.
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Affiliation(s)
- Richard H G Baxter
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, USA.
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15
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Deisenhofer J, Michel H. The Photosynthetic Reaction Centre from the Purple Bacterium Rhodopseudomonasviridis. Biosci Rep 2005; 24:323-61. [PMID: 16134018 DOI: 10.1007/s10540-005-2737-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
We first describe the history and methods of membrane protein crystallization, and show how the structure of the photosynthetic reaction centre from the purple bacterium Rhodopseudomonas viridis was solved. The structure of this membrane protein complex is correlated with its function as a light-driven electron pump across the photosynthetic membrane. Finally we draw conclusions on the structure of the photosystem II reaction centre from plants and discuss the aspects of membrane protein structure.
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Affiliation(s)
- Johann Deisenhofer
- Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA
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16
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Müh F, Zouni A. Extinction coefficients and critical solubilisation concentrations of photosystems I and II from Thermosynechococcus elongatus. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2005; 1708:219-28. [PMID: 15953478 DOI: 10.1016/j.bbabio.2005.03.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2004] [Revised: 03/10/2005] [Accepted: 03/13/2005] [Indexed: 10/25/2022]
Abstract
The absorption properties of chlorophyll a (Chla) in active core complexes of photosystems I (PSI) and II (PSII) isolated in high purity from the thermophilic cyanobacterium Thermosynechococcus elongatus were correlated with those of extracts in 80% acetone to determine effective extinction coefficients of protein-bound Chla and molar extinction coefficients of core complexes and reaction centers (RC). These coefficients allow a quick determination of Chla and protein concentrations from steady-state absorption spectra of intact samples without the need for pigment extraction and protein destruction. In the visible range, epsilon(680)(p) = 57 mM(-1) cm(-1) for trimeric PSI (PSIt) and epsilon(674)(p) = 70 mM(-1) cm(-1) for dimeric (PSIId) and monomeric (PSIIm) PSII (error +/-6%; superscript "p" refers to Chla bound to intact protein, subscripts are the peak maxima in nm). The integral extinction coefficient phi(p) = 2.8 nm microM(-1) cm(-1) for the wavelength interval between 550 and 800 nm and the extinction coefficient epsilon(B)(p) = 14 mM(-1) cm(-1) for the smaller absorption maximum (B = 632 nm for PSI and 627 nm for PSII) were found to be essentially the same for both types of PS. The coefficients of PSIt are shown to remain unaltered when 65% (v/v) of the buffer is replaced with glycerol. Molar extinction coefficients of core complexes were determined using Chla/RC ratios of 96+/-1 for PSI and 35+/-2 for PSII based on X-ray data. In addition, the critical solubilisation concentration of n-dodecyl-beta-d-maltoside (betaDM), necessary to keep the core complexes in solution, was determined by turbidimetric titrations. It was found that at least approximately 500 betaDM molecules per PSIt ( approximately 2 betaDM per Chla) and 190 betaDM molecules per PSIIm ( approximately 5 betaDM per Chla, also for PSIId) in excess of the critical micelle concentration of 0.16 +/- 0.03 mM are necessary for a complete solubilisation of the core complexes.
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Affiliation(s)
- Frank Müh
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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17
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Odahara T. Stability and solubility of integral membrane proteins from photosynthetic bacteria solubilized in different detergents. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2004; 1660:80-92. [PMID: 14757223 DOI: 10.1016/j.bbamem.2003.11.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
As a first step toward the establishment of practical guidelines for the search for crystallization conditions, stability and solubility were examined for integral membrane proteins from photosynthetic bacteria in the presence of different detergents. The results obtained from their stability provided practical information on the proper choice of detergent type in the preparation process and the subsequent crystallization experiment. In addition, the determination of a solubility diagram provided a practical method for quantifying the correct choice of detergent concentration and for setting up the suitable precipitant concentration in the crystallization experiment.
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Affiliation(s)
- Takayuki Odahara
- National Institute of Advanced Industrial Science and Technology, Tsukuba Central-6, 1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
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18
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Nitschke W, Rutherford AW. Tetraheme cytochrome c subunit of Rhodopseudomonas viridis characterized by EPR. Biochemistry 2002. [DOI: 10.1021/bi00434a008] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Gast P, Michalski T, Hunt J, Norris J. Determination of the amount and the type of quinones present in single crystals from reaction center protein from the photosynthetic bacterium Rhodopseudomonas viridis. FEBS Lett 2001. [DOI: 10.1016/0014-5793(85)80544-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Wasielewski MR, Tiede DM. Sub-picosecond measurements of primary electron transfer in Rhodopseudomonas viridis
reaction centers using near-infrared excitation. FEBS Lett 2001. [DOI: 10.1016/0014-5793(86)80845-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Vermeglio A, Richaud P, Breton J. Orientation and assignment of the four cytochrome hemes in Rhodopseudomonas viridis
reaction centers. FEBS Lett 2001. [DOI: 10.1016/0014-5793(89)80140-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Dracheva SM, Drachev LA, Zaberezhnaya SM, Konstantincv AA, Semenov AY, Skulachev VP. Spectral, redox and kinetic characteristics of high-potential cytochrome c
hemes in Rhodopseudomonas viridis
reaction center. FEBS Lett 2001. [DOI: 10.1016/0014-5793(86)80862-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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23
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Thornber J, Seftor RE, Cogdell RJ. Intermediary electron carriers in the primary photosynthetic event of Rhodopseudomonas viridis. FEBS Lett 2001. [DOI: 10.1016/0014-5793(81)80609-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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24
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Gibasiewicz K, Brettel K, Dobek A, Leibl W. Re-examination of primary radical pair recombination in Rp. viridis with QA reduced. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)01158-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Novel multipulse saturation spectroscopy for quantum yield determination of charge separation in modified photosynthetic reaction centers. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00461-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Hara M, Kaneko T, Nakamura C, Asada Y, Miyake J. Redox properties of an H-subunit-depleted photosynthetic reaction center from Rhodopseudomonas viridis. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1363:199-208. [PMID: 9518612 DOI: 10.1016/s0005-2728(98)00004-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Recently, we reported that a H-subunit-depleted photosynthetic reaction center (RC-H) was purified from purple nonsulfer photosynthetic bacterium Rhodopseudomonas viridis (Rps. viridis) using a strong detergent sodium alkyl ether sulfate. We compared the redox properties of a native photosynthetic reaction center (RC) and RC-H of Rps. viridis. In RC-H prepared by our method, secondary quinone (QB) was removed while primary quinone (QA) was retained. Absorption spectrum of RC-H was similar to that of RC. After reconstitution of ubiquinone 10 into QB sites, RC-H showed electron transfer activity that was the same as that for native RC. This is the first report about the redox properties of RC-H of Rps. viridis.
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Affiliation(s)
- M Hara
- National Institute of Bioscience and Human Technology, Agency of Industrial Science and Technology (AIST), Ministry of International Trade and Industry (MITI), 1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
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27
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Ortega JM, Dohse B, Oesterhelt D, Mathis P. Low-temperature electron transfer from cytochrome to the special pair in Rhodopseudomonas viridis: role of the L162 residue. Biophys J 1998; 74:1135-48. [PMID: 9512015 PMCID: PMC1299465 DOI: 10.1016/s0006-3495(98)77831-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Electron transfer from the tetraheme cytochrome c to the special pair of bacteriochlorophylls (P) has been studied by flash absorption spectroscopy in reaction centers isolated from seven strains of the photosynthetic purple bacterium Rhodopseudomonas viridis, where the residue L162, located between the proximal heme c-559 and P, is Y (wild type), F, W, G, M, T, or L. Measurements were performed between 294 K and 8 K, under redox conditions in which the two high-potential hemes of the cytochrome were chemically reduced. At room temperature, the kinetics of P+ reduction include two phases in all of the strains: a dominant very fast phase (VF), and a minor fast phase (F). The VF phase has the following t(1/2): 90 ns (M), 130 ns (W), 135 ns (F), 189 ns (Y; wild type), 200 ns (G), 390 ns (L), and 430 ns (T). These data show that electron transfer is fast whatever the nature of the amino acid at position L162. The amplitudes of both phases decrease suddenly around 200 K in Y, F, and W. The effect of temperature on the extent of fast phases is different in mutants G, M, L, and T, in which electron transfer from c-559 to P+ takes place at cryogenic temperatures in a substantial fraction of the reaction centers (T, 48%; G, 38%; L, 23%, at 40 K; and M, 28%, at 60 K), producing a stable charge separated state. In these nonaromatic mutants the rate of VF electron transfer from cytochrome to P+ is nearly temperature-independent between 294 K and 8 K, remaining very fast at very low temperatures (123 ns at 60 K for M; 251 ns at 40 K for L; 190 ns at 8 K for G, and 458 ns at 8 K for T). In all cases, a decrease in amplitudes of the fast phases is paralleled by an increase in very slow reduction of P+, presumably by back-reaction with Q(A)-. The significance of these results is discussed in relation to electron transfer theories and to freezing at low temperatures of cytochrome structural reorganization.
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Affiliation(s)
- J M Ortega
- Section de Bioénergétique, DBCM (CNRS, URA 2096), CEA-Saclay, Gif-sur-Yvette, France
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28
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Breton J. Efficient exchange of the primary quinone acceptor Q(A) in isolated reaction centers of Rhodopseudomonas viridis. Proc Natl Acad Sci U S A 1997; 94:11318-23. [PMID: 11038584 PMCID: PMC23455 DOI: 10.1073/pnas.94.21.11318] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A key step in the conversion of solar energy into chemical energy by photosynthetic reaction centers (RCs) occurs at the level of the two quinones, Q(A) and Q(B), where electron transfer couples to proton transfer. A great deal of our understanding of the mechanisms of these coupled reactions relies on the seminal work of Okamura et al. [Okamura, M. Y., Isaacson, R. A., & Feher, G. (1975) Proc. Natl. Acad. Sci. USA 88, 3491-3495], who were able to extract with detergents the firmly bound ubiquinone Q(A) from the RC of Rhodobacter sphaeroides and reconstitute the site with extraneous quinones. Up to now a comparable protocol was lacking for the RC of Rhodopseudomonas viridis despite the fact that its Q(A) site, which contains 2-methyl-3-nonaprenyl-1,4-naphthoquinone (menaquinone-9), has provided the best x-ray structure available. Fourier transform infrared difference spectroscopy, together with the use of isotopically labeled quinones, can probe the interaction of Q(A) with the RC protein. We establish that a simple incubation procedure of isolated RCs of Rp. viridis with an excess of extraneous quinone allows the menaquinone-9 in the Q(A) site to be almost quantitatively replaced either by vitamin K(1), a close analogue of menaquinone-9, or by ubiquinone. To our knowledge, this is the first report of quinone exchange in bacterial photosynthesis. The Fourier transform infrared data on the quinone and semiquinone vibrations show a close similarity in the bonding interactions of vitamin K(1) with the protein at the Q(A) site of Rp. viridis and Rb. sphaeroides, whereas for ubiquinone these interactions are significantly different. The results are interpreted in terms of slightly inequivalent quinone-protein interactions by comparison with the crystallographic data available for the Q(A) site of the two RCs.
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Affiliation(s)
- J Breton
- Section de Bioénergétique, Département de Biologie Cellulaire et Moléculaire, Commissariat à l'Energie Atomique, Saclay, 91191 Gif-sur-Yvette Cedex, France
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29
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Brancato-Buentello KE, Kang SJ, Scheidt WR. Metalloporphyrin Mixed-Valence π-Cation Radicals: Solution Stability and Properties. J Am Chem Soc 1997. [DOI: 10.1021/ja9616950] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Seong-Joo Kang
- Contribution from the Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556
| | - W. Robert Scheidt
- Contribution from the Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556
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30
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Nature of the ground and first excited states of the radical cations of photosynthetic bacterial reaction centres. Chem Phys 1995. [DOI: 10.1016/0301-0104(95)00148-h] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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31
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Kaminskaya O, Bratt PJ, Evans MC. EPR properties of the four hemes in the cytochrome subunit of reaction centres from Rhodopseudomonas viridis: characterization of the individual hemes. Chem Phys 1995. [DOI: 10.1016/0301-0104(95)00020-o] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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Gast P, Hemelrijk P, Hoff AJ. Determination of the number of detergent molecules associated with the reaction center protein isolated from the photosynthetic bacterium Rhodopseudomonas viridis. Effects of the amphiphilic molecule 1,2,3-heptanetriol. FEBS Lett 1994; 337:39-42. [PMID: 8276109 DOI: 10.1016/0014-5793(94)80625-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Detergent-free reaction center (RC) proteins from the photosynthetic bacterium Rhodopseudomonas viridis were obtained using Bio-Beads SM-2. With these RCs, the amount of detergent molecules associated with the protein was measured by determining the detergent concentration at which re-solubilization occurred as a function of the RC concentration. For N,N-dimethyl dodecylamine-N-oxide (LDAO), Triton X-100 and beta-octylglucoside 260 +/- 30,105 +/- 10 and 360 +/- 100 detergent molecules were necessary to dissolve the protein, respectively. With this technique we have studied the effect of the amphiphilic molecule 1,2,3-heptanetriol, which is essential in the crystallization process of these RCs. Addition of 5% 1,2,3-heptanetriol reduces the value for LDAO to 120 +/- 20 LDAO/RC, supporting the notion that crystallization of the RCs is promoted by increasing the number of protein-protein contacts.
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Affiliation(s)
- P Gast
- Department of Biophysics, Huygens Laboratory, Leiden, The Netherlands
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33
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Breton J, Nabedryk E, Parson WW. A new infrared electronic transition of the oxidized primary electron donor in bacterial reaction centers: a way to assess resonance interactions between the bacteriochlorophylls. Biochemistry 1992; 31:7503-10. [PMID: 1510937 DOI: 10.1021/bi00148a010] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The primary electron donor in the reaction center of purple photosynthetic bacteria consists of a pair of bacteriochlorophylls (PL and PM). The oxidized dimer (P+) is expected to have an absorption band in the mid-IR, whose energy and dipole strength depend in part on the resonance interactions between the two bacteriochlorophylls. A broad absorption band with the predicted properties was found in a previously unexplored region of the spectrum, centered near 2600 cm-1 in reaction centers of Rhodobacter sphaeroides and several other species of bacteria that contain bacteriochlorophyll a, and near 2750 cm-1 in Rhodopseudomonas viridis. The band is not seen in the absorption spectrum of the monomeric bacteriochlorophyll cation in solution, and it is missing or much diminished in the reaction centers of bacterial mutants that have a bacteriopheophytin in place of either PL or PM. With the aid of a relatively simple quantum mechanical model, the measured transition energy and dipole strength of the band can be used to solve for the resonance interaction matrix element that causes an electron to move back and forth between PL and PM, and also for the energy difference between states in which a positive charge is localized on either PL or PM. (The absorption band can be viewed as representing a transition between supermolecular eigenstates that are obtained by mixing these basis states.) The values of the matrix element obtained in this way agree reasonably well with values calculated by using semiempirical atomic resonance integrals and the reaction center crystal structures.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J Breton
- SBE/DBCM, CEN-Saclay, Gif-sur-Yvette, France
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34
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Ortega JM, Mathis P. Effect of temperature on the kinetics of electron transfer from the tetraheme cytochrome to the primary donor in Rhodopseudomonas viridis. FEBS Lett 1992; 301:45-8. [PMID: 1333411 DOI: 10.1016/0014-5793(92)80207-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The kinetics of electron transfer from the third highest potential heme (c-552, Em = +20 mV) to the primary donor (P-960) have been measured by flash absorption spectroscopy in isolated reaction centers of Rhodopseudomonas viridis between 300 K and 7 K. The data are analyzed on the basis of three exponential components with a very fast phase (t1/2 = 120 ns) dominating at high temperature and a very slow one (t1/2 = 1.2 ms) at low temperature. This multiphasic behavior is interpreted in terms of the existence of three states with a temperature-dependent population and a very limited effect of the temperature on the kinetics for each state.
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Affiliation(s)
- J M Ortega
- Département de Biologie Cellulaire et Moléculaire, C.E. Saclay, Gif-sur-Yvette, France
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35
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Struck A, Müller A, Scheer H. Modified bacterial reaction centers. 4. The borohydride treatment reinvestigated: comparison with selective exchange experiments at binding sites BA,B and HA,B. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1991. [DOI: 10.1016/s0005-2728(05)80316-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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36
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Alegria G, Dutton PL. Langmuir-Blodgett monolayer films of bacterial photosynthetic membranes and isolated reaction centers: preparation, spectrophotometric and electrochemical characterization. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1057:239-57. [PMID: 1849739 DOI: 10.1016/s0005-2728(05)80107-0] [Citation(s) in RCA: 92] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The Langmuir-Blodgett (LB) film technique has been successfully applied to the construction of stable and photo-active films of chromatophore membranes and isolated reaction centers from two species of photosynthetic bacteria, Rhodobacter sphaeroides and Rhodopseudomonas viridis. LB films of these preparations were characterized at the air/water interface through compression isotherms and film stabilities. Films deposited on glass slides were analyzed by spectrophotometric and redox potentiometric techniques. The results obtained indicate that the in vivo properties of the photosynthetic apparatus in the deposited films are essentially unchanged. Furthermore, the pigments and redox cofactors in the films are highly oriented and offer a unique opportunity for structural and functional studies of the kind described in the accompanying paper (Biochim. Biophys. Acta 1057 (1991) 258-272).
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Affiliation(s)
- G Alegria
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia 19104
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37
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Knaff DB, Willie A, Long JE, Kriauciunas A, Durham B, Millett F. Reaction of cytochrome c2 with photosynthetic reaction centers from Rhodopseudomonas viridis. Biochemistry 1991; 30:1303-10. [PMID: 1846750 DOI: 10.1021/bi00219a021] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The reactions of Rhodopseudomonas viridis cytochrome c2 and horse cytochrome c with Rps. viridis photosynthetic reaction centers were studied by using both single- and double-flash excitation. Single-flash excitation of the reaction centers resulted in rapid photooxidation of cytochrome c-556 in the cytochrome subunit of the reaction center. The photooxidized cytochrome c-556 was subsequently reduced by electron transfer from ferrocytochrome c2 present in the solution. The rate constant for this reaction had a hyperbolic dependence on the concentration of cytochrome c2, consistent with the formation of a complex between cytochrome c2 and the reaction center. The dissociation constant of the complex was estimated to be 30 microM, and the rate of electron transfer within the 1:1 complex was 270 s-1. Double-flash experiments revealed that ferricytochrome c2 dissociated from the reaction center with a rate constant of greater than 100 s-1 and allowed another molecule of ferrocytochrome c2 to react. When both cytochrome c-556 and cytochrome c-559 were photooxidized with a double flash, the rate constant for reduction of both components was the same as that observed for cytochrome c-556 alone. The observed rate constant decreased by a factor of 14 as the ionic strength was increased from 5 mM to 1 M, indicating that electrostatic interactions contributed to binding. Molecular modeling studies revealed a possible cytochrome c2 binding site on the cytochrome subunit of the reaction center involving the negatively charged residues Glu-93, Glu-85, Glu-79, and Glu-67 which surround the heme crevice of cytochrome c-554.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- D B Knaff
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock 79409-1061
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38
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Kaminskaya O, Konstantinov AA, Shuvalov V. Low-temperature photooxidation of cytochrome c in reaction centre complexes from Rhodopseudomonas viridis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1990. [DOI: 10.1016/0005-2728(90)90054-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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39
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Gao JL, Shopes RJ, Wraight CA. Charge recombination between the oxidized high-potential c-type cytochromes and Q−A in reaction centers from Rhodopseudomonas viridis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1990. [DOI: 10.1016/0005-2728(90)90220-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Assignment of cytochrome hemes in crystallized reaction centers from Rhodopseudomonas viridis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1989. [DOI: 10.1016/s0005-2728(89)80066-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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41
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Protein-prosthetic group interactions in bacterial reaction centers: resonance raman spectroscopy of the reaction center of Rhodopseudomonas viridis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1989. [DOI: 10.1016/s0005-2728(89)80003-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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42
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Partial equilibration of photosynthetic electron carriers under weak illumination: a theoretical and experimental study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1989. [DOI: 10.1016/s0005-2728(89)80342-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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43
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Deisenhofer J, Michel H. The photosynthetic reaction centre from the purple bacterium Rhodopseudomonas viridis. Biosci Rep 1989; 9:383-419. [PMID: 2686774 DOI: 10.1007/bf01117044] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
We first describe the history and methods of membrane protein crystallization, and show how the structure of the photosynthetic reaction centre from the purple bacterium Rhodopseudomonas viridis was solved. The structure of this membrane protein complex is correlated with its function as a light-driven electron pump across the photosynthetic membrane. Finally we draw conclusions on the structure of the photosystem II reaction centre from plants and discuss the aspects of membrane protein structure.
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Affiliation(s)
- J Deisenhofer
- Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas 75235
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44
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Deisenhofer J, Michel H. Das photosynthetische Reaktionszentrum des PurpurbakteriumsRhodopseudomonas viridis (Nobel-Vortrag). Angew Chem Int Ed Engl 1989. [DOI: 10.1002/ange.19891010705] [Citation(s) in RCA: 92] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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45
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Dracheva SM, Drachev LA, Konstantinov AA, Semenov AYu, Skulachev VP, Arutjunjan AM, Shuvalov VA, Zaberezhnaya SM. Electrogenic steps in the redox reactions catalyzed by photosynthetic reaction-centre complex from Rhodopseudomonas viridis. EUROPEAN JOURNAL OF BIOCHEMISTRY 1988; 171:253-64. [PMID: 2828052 DOI: 10.1111/j.1432-1033.1988.tb13784.x] [Citation(s) in RCA: 123] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Electrogenic and redox events in the reaction-centre complexes from Rhodopseudomonas viridis have been studied. In contrast to the previous points of view it is shown that all the four hemes of the tightly bound cytochrome c have different Em values (-60, +20, +310 and +380 mV). The first three hemes reveal alpha absorption maxima at 554 nm, 552 nm and 556 nm respectively. The 380-mV heme displays a split alpha band with a maximum at 559 nm and a shoulder at 552 nm. Such a splitting is due to non-degenerated Qx and Qy transitions in the iron-porphyrin ring as demonstrated by magnetic circular dichroism spectra. Fast kinetic measurements show that, at redox potentials when only high-potential hemes c-559 and c-556 are reduced, heme c-559 appears to be the electron donor to P-960+ (tau = 0.32 microsecond) whereas heme c-556 serves to rereduce c-559 (tau = 2.5 microsecond). Upon reduction of the third heme (c-552), the P-960+ reduction rate increases twofold (tau = 0.17 microsecond) and all photoinduced redox events within the cytochrome appear to be complete in less than 1 microsecond after the flash. The following sequence of the redox centers is tentatively suggested: c-554, c-556, c-552, c-559, P-960. To study electrogenesis, the reaction-centre complexes from Rps. viridis were incorporated into asolectin liposomes, and fast kinetics of laser flash-induced electric potential difference has been measured in proteoliposomes adsorbed on a phospholipid-impregnated film. The electrical difference induced by a single 15-ns flash was found to be as high as 100 mV. The photoelectric response has been found to involve four electrogenic stages associated with (I) QA reduction by P-960; (II) reduction of P-960+ by heme c-559; (III) reduction of c-559 by c-556 and (IV) protonation of Q2-B. The relative contributions of stages I, II, III and IV are found to be equal to 70%, 15%, 5% and 10%, respectively, of the overall electrogenic process. At the same time, the first three respective distances along the axis normal to the membrane plane covered by electrons, calculated from X-ray data of Deisenhofer et al. [J. Mol. Biol. 180, 385-398 (1984)], are 22%, 18.5% and 26%. This indicates that the efficiency of electrogenic phases depends first of all upon the value of the dielectric constant of the respective membrane regions rather than upon the distance between the redox groups involved.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- S M Dracheva
- A. N. Belozersky Laboratory of Molecular Biology and Bioorganic Chemistry, Moscow State University, USSR
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46
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Wynn R, Redlinger TE, Foster JM, Blankenship RE, Fuller R, Shaw RW, Knaff DB. Electron-transport chains of phototrophically and chemotrophically grown Chloroflexus aurantiacus. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1987. [DOI: 10.1016/0005-2728(87)90217-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Shopes RJ, Levine LM, Holten D, Wraight CA. Kinetics of oxidation of the bound cytochromes in reaction centers from Rhodopseudomonas viridis. PHOTOSYNTHESIS RESEARCH 1987; 12:165-180. [PMID: 24435639 DOI: 10.1007/bf00047946] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/1986] [Revised: 02/11/1987] [Accepted: 02/11/1987] [Indexed: 06/03/2023]
Abstract
The initial oxidized species in the photochemical charge separation in reaction centers from Rps. viridis is the primary donor, P(+), a bacteriochlorophyll dimer. Bound c-type cytochromes, two high potential (Cyt c 558) and two low potential (Cyt c 553), act as secondary electron donors to P(+). Flash induced absorption changes were measured at moderate redox potential, when the high potential cytochromes were chemically reduced. A fast absorption change was due to the initial oxidation of one of the Cyt c 558 by P(+) with a rate of 3.7×10(6)s(-1) (τ=270nsec). A slower absorption change was attributable to a transfer, or sharing, of the remaining electron from one high potential heme to the other, with a rate of 2.8×10(5)s(-1) (τ=3.5 μsec). The slow change was measured at a number of wavelengths throughout the visible and near infrared and revealed that the two high potential cytochromes have slightly different differential absorption spectra, with α-band maxima at 559 nm (Cyt c 559) and 556.5 nm (Cyt c 556), and dissimilar electrochromic effects on nearby pigments. The sequence of electron transfers, following a flash, is: Cyt c 556→Cyt c 559→P(+). At lower redox potentials, a low midpoint potential cytochrome, Cyt c 553, is preferentially oxidized by P(+) with a rate of 7×10(6)s(-1) (τ=140 nsec). The assignment of the low and high potential cytochromes to the four, linearly arranged hemes of the reaction center is discussed. It is concluded that the closest heme to P must be the high potential Cyt c 559, and it is suggested that a likely arrangement for the four hemes is: c 553 c 556 c 553 c 559P.
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Affiliation(s)
- R J Shopes
- Department of Physiology and Biophysics, University of Illinois, 61801, Urbana, IL, USA
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Wanner G, Steiner R, Scheer H. A three dimensional model of the photosynthetic membranes of Ectothiorhodospira halochloris. Arch Microbiol 1986. [DOI: 10.1007/bf00403228] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Shopes RJ, Wraight CA. Primary donor recovery kinetics in reaction centers from Rhodopseudomonas viridis. The influence of ferricyanide as a rapid oxidant of the acceptor quinones. BIOCHIMICA ET BIOPHYSICA ACTA 1986; 848:364-71. [PMID: 3947620 DOI: 10.1016/0005-2728(86)90212-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In reaction centers from Rhodopseudomonas viridis that contain a single quinone, the decay of the photo-oxidized primary donor, P+, was found to be biphasic when the bound, donor cytochromes were chemically oxidized by ferricyanide. The ratio of the two phases was dependent on pH with an apparent pK of 7.6. A fast phase, which dominated at high pH (t1/2 = 1 ms at pH 9.5), corresponded to the expected charge recombination of P+ and the primary acceptor QA-. A much slower phase dominated at low pH and was shown to arise from a slow reduction of P+ by ferrocyanide in reaction centers where QA- has been rapidly oxidized by ferricyanide. The rate of QA- oxidation was linear with respect to ferricyanide activity and was strongly pH-dependent. The second-order rate constant, corrected for the activity coefficient of ferricyanide, approached a maximum of 2 X 10(8) M-1 X s-1 at low pH, but decreased steadily as the pH was raised above a pK of 5.8, indicating that a protonated state of the reaction center was involved. The slow reduction of P+ by ferrocyanide was also second-order, with a maximum rate constant at low pH of 8 X 10(5) M-1 X s-1 corrected for the activity coefficient of ferrocyanide. This rate also decreased at higher pH, with a pK of 7.4, indicating that ferrocyanide also was most reactive with a protonated form of the reaction center. The oxidation of QA- by ferricyanide was unaffected by the presence of o-phenanthroline, implying that access to QA- was not via the QB-binding site. In reaction centers supplemented with ubiquinone, oxidation of reduced secondary quinone, QB-, by ferricyanide was observed but was substantially slower than that for QA-. It is suggested that Q-B may be oxidized via QA so that the rate is modulated by the equilibrium constant for QA-QB in equilibrium with QAQB-.
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