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Shafiei G, Levenberg A, Lujan MA, Picorel R, Zazubovich V. Evidence of Simultaneous Spectral Hole Burning Involving Two Tiers of the Protein Energy Landscape in Cytochrome b6f. J Phys Chem B 2019; 123:10930-10938. [PMID: 31763829 DOI: 10.1021/acs.jpcb.9b09515] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cytochrome b6f, with one chlorophyll molecule per protein monomer, is a simple model system whose studies can help achieve a better understanding of nonphotochemical spectral hole burning (NPHB) and single-complex spectroscopy results obtained in more complicated photosynthetic chlorophyll-protein complexes. We are reporting new data and proposing an alternative explanation for spectral dynamics that was recently observed in cytochrome b6f using NPHB. The relevant distribution of the tunneling parameter λ is a superposition of two components that are nearly degenerate in terms of the resultant NPHB yield and represent two tiers of the energy landscape responsible for NPHB. These two components likely burn competitively; we present the first demonstration of modeling a competitive NPHB process. Similar values of the NPHB yield result from distinctly different combinations of barrier heights, shifts along the generalized coordinate d, and/or masses of the entities involved in conformational changes m, with md2 parameter different by a factor of 2.7. Consequently, in cytochrome b6f, the first (at least) 10 h of fixed-temperature recovery preferentially probe different components of the barrier- and λ-distributions encoded into the spectral holes than thermocycling experiments. Both components most likely represent dynamics of the protein and not of the surrounding buffer/glycerol glass.
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Affiliation(s)
- Golia Shafiei
- Department of Physics , Concordia University , 7141 Sherbrooke Str. West , Montreal , Quebec H4B 1R6 , Canada
| | - Alexander Levenberg
- Department of Physics , Concordia University , 7141 Sherbrooke Str. West , Montreal , Quebec H4B 1R6 , Canada
| | - Maria A Lujan
- Estacion Experimental de Aula Dei (CSIC) , Avda. Montañana 1005 , 50059 Zaragoza , Spain
| | - Rafael Picorel
- Estacion Experimental de Aula Dei (CSIC) , Avda. Montañana 1005 , 50059 Zaragoza , Spain
| | - Valter Zazubovich
- Department of Physics , Concordia University , 7141 Sherbrooke Str. West , Montreal , Quebec H4B 1R6 , Canada
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Knox PP, Lukashev EP, Gorokhov VV, Seifullina NK, Paschenko VZ. Relaxation processes accompanying electron stabilization in the quinone acceptor part of Rb. sphaeroides reaction centers. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2018; 189:145-151. [PMID: 30347352 DOI: 10.1016/j.jphotobiol.2018.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 10/03/2018] [Accepted: 10/04/2018] [Indexed: 06/08/2023]
Abstract
The temperature dependence of the dark recombination rate in photooxidized bacteriochlorophyll (P) and photoreduced quinone acceptors (ubiquinones) QA and QB of photosynthetic reaction centers of purple bacteria Rhodobacter sphaeroides (Rb. sphaeroides) was studied. Photoinduced changes in the absorption were detected in the Qx absorption band of photooxidized bacteriochlorophyll at 600 nm and in the bands corresponding to the redox changes of ubiquinones at 335 and 420-450 nm. Kinetic analysis was used to evaluate the activation energy and the characteristic time of the transient process of relaxation accompanying electron stabilization at the final quinone acceptor. A comparative study of the kinetics of oxidation-reduction reactions of photoactive bacteriochlorophyll RC purple bacteria and quinone acceptors in their individual absorption bands is an informative approach to studying the mechanisms of this stabilization. The analysis of the revealed kinetic differences makes it possible to estimate the activation energy and the characteristic times of the transition relaxation processes associated with the stabilization of the electron in the quinone acceptor part of RC. Purple bacterial reaction centers have fundamental similarities with PSII reaction centers. Such a similarity represents evolutional closeness between the two types of RC. So it is possible that the photoinduced charge separation in PSII RC, as well as in purple bacteria RC, is also accompanied by definite conformational changes. The possible role of hydrogen bonds of surrounding protein in the relaxation processes accompanying the electron transfer to quinone acceptors is discussed.
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Affiliation(s)
- P P Knox
- Department of Biophysics, Biological Faculty of the M.V., Lomonosov Moscow State University, 119991 Moscow, Russia
| | - E P Lukashev
- Department of Biophysics, Biological Faculty of the M.V., Lomonosov Moscow State University, 119991 Moscow, Russia
| | - V V Gorokhov
- Department of Biophysics, Biological Faculty of the M.V., Lomonosov Moscow State University, 119991 Moscow, Russia
| | - N Kh Seifullina
- Department of Biophysics, Biological Faculty of the M.V., Lomonosov Moscow State University, 119991 Moscow, Russia
| | - V Z Paschenko
- Department of Biophysics, Biological Faculty of the M.V., Lomonosov Moscow State University, 119991 Moscow, Russia.
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Knox PP, Gorokhov VV, Korvatovskiy BN, Lukashev EP, Goryachev SN, Paschenko VZ, Rubin AB. The effect of light and temperature on the dynamic state of Rhodobacter sphaeroides reaction centers proteins determined from changes in tryptophan fluorescence lifetime and P +Q A- recombination kinetics. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 180:140-148. [PMID: 29413697 DOI: 10.1016/j.jphotobiol.2018.01.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 01/22/2018] [Accepted: 01/29/2018] [Indexed: 11/26/2022]
Abstract
The temperature dependencies of the rate of dark recombination of separated charges between the photoactive bacteriochlorophyll and the primary quinone acceptor (QA) in photosynthetic reaction centers (RCs) of the purple bacteria Rhodobacter sphaeroides (Rb. sphaeroides) were investigated. Measurements were performed in water-glycerol and trehalose environments after freezing to -180 °C in the dark and under actinic light with subsequent heating. Simultaneously, the RC tryptophanyl fluorescence lifetime in the spectral range between 323 and 348 nm was measured under these conditions. A correlation was found between the temperature dependencies of the functional and dynamic parameters of RCs in different solvent mixtures. For the first time, differences in the average fluorescence lifetime of tryptophanyl residues were measured between RCs frozen in the dark and in the actinic light. The obtained results can be explained by the RC transitions between different conformational states and the dynamic processes in the structure of the hydrogen bonds of RCs. We assumed that RCs exist in two main microconformations - "fast" and "slow", which are characterized by different rates of P+ and QA- recombination reactions. The "fast" conformation is induced in frozen RCs in the dark, while the "slow" conformation of RC occurs when the RC preparation is frozen under actinic light. An explanation of the temperature dependencies of tryptophan fluorescence lifetimes in RC proteins was made under the assumption that temperature changes affect mainly the electron transfer from the indole ring of the tryptophan molecule to the nearest amide or carboxyl groups.
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Affiliation(s)
- Peter P Knox
- Department of Biophysics, Biological Faculty of the M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Vladimir V Gorokhov
- Department of Biophysics, Biological Faculty of the M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Boris N Korvatovskiy
- Department of Biophysics, Biological Faculty of the M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Eugene P Lukashev
- Department of Biophysics, Biological Faculty of the M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Sergey N Goryachev
- Department of Biophysics, Biological Faculty of the M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Vladimir Z Paschenko
- Department of Biophysics, Biological Faculty of the M.V. Lomonosov Moscow State University, 119991 Moscow, Russia.
| | - Andrew B Rubin
- Department of Biophysics, Biological Faculty of the M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
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Knox PP, Lukashev EP, Korvatovskii BN, Gorokhov VV, Grishanova NP, Seyfullina NK, Paschenko VZ, Rubin AB. A comparison of the temperature dependence of charge recombination in the ion-radical pair P870+QA - and tryptophan fluorescence in the photosynthetic reaction centers of Rhodobacter sphaeroides. Biophysics (Nagoya-shi) 2017. [DOI: 10.1134/s0006350916060191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Purple-bacterial photosynthetic reaction centers and quantum‐dot hybrid‐assemblies in lecithin liposomes and thin films. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 164:73-82. [DOI: 10.1016/j.jphotobiol.2016.09.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 09/06/2016] [Indexed: 11/18/2022]
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Lukashev EP, Knox PP, Krasilnikov PM, Seifullina NK, Rubin AB. Mechanisms of anomalous temperature dependence of the recombination of the photoseparated charges between bacteriochlorophyll and primary quinone in Rb. sphaeroides: The role of RC hydrogen bonds. DOKL BIOCHEM BIOPHYS 2015; 459:199-203. [PMID: 25559979 DOI: 10.1134/s1607672914060052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Indexed: 11/23/2022]
Affiliation(s)
- E P Lukashev
- Department of Biophysics, Biological Faculty, Moscow State University, Moscow, 119992, Russia
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Zagidullin VE, Lukashev EP, Knox PP, Seifullina NK, Sokolova OS, Pechnikova EV, Lokstein H, Paschenko VZ. Properties of hybrid hybrid complexes composed of photosynthetic reaction centers from the purple bacterium Rhodobacter sphaeroides and quantum dots in lecithin liposomes. BIOCHEMISTRY (MOSCOW) 2014; 79:1183-91. [DOI: 10.1134/s0006297914110054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Krasilnikov PM. Two-dimensional model of a double-well potential: Proton transfer upon hydrogen bond deformation. Biophysics (Nagoya-shi) 2014. [DOI: 10.1134/s0006350914020158] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Knox PP, Krasilnikov PM, Lukashev EP, Seifullina NK, Rubin AB. The spectral-kinetic indicators of relaxation processes following the electron stabilization into the acceptor compartment of photosynthetic RCs of bacteria. DOKL BIOCHEM BIOPHYS 2014; 455:49-52. [PMID: 24795098 DOI: 10.1134/s1607672914020021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Indexed: 11/23/2022]
Affiliation(s)
- P P Knox
- Biological Faculty, Moscow State University, Moscow, 119992, Russia,
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Krasilnikov PM. Problems of the theory of electron transfer in biological systems. Biophysics (Nagoya-shi) 2014. [DOI: 10.1134/s0006350914010059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Krasilnikov PM, Knox PP, Rubin AB. A mechanism stabilizing a long-lived charge-separated state of photosynthetic reaction centers frozen under intense illumination. Biophysics (Nagoya-shi) 2013. [DOI: 10.1134/s000635091304009x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Krasilnikov PM. Theory of intermolecular electron transfer in nanoscale biological structures. Biophysics (Nagoya-shi) 2011. [DOI: 10.1134/s0006350911050095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Knox PP, Lukashev EP, Simanova AV, Krupyanskii YF, Loiko NG, El’-Registan GI, Rubin AB. The influence of alkylhydroxybenzenes on electron stabilization processes in the quinone acceptor portion of the reaction centers of the bacterium Rhodobacter sphaeroides. Microbiology (Reading) 2010. [DOI: 10.1134/s0026261710020190] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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