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Bommer M, Bondar AN, Zouni A, Dobbek H, Dau H. Crystallographic and Computational Analysis of the Barrel Part of the PsbO Protein of Photosystem II: Carboxylate–Water Clusters as Putative Proton Transfer Relays and Structural Switches. Biochemistry 2016; 55:4626-35. [DOI: 10.1021/acs.biochem.6b00441] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Martin Bommer
- Institut
für Biologie, Strukturbiologie/Biochemie, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany
| | - Ana-Nicoleta Bondar
- Fachbereich
Physik, Theoretical Molecular Biophysics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Athina Zouni
- Institut
für Biologie, Biophysik der Photosynthese, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany
| | - Holger Dobbek
- Institut
für Biologie, Strukturbiologie/Biochemie, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany
| | - Holger Dau
- Fachbereich
Physik, Biophysics and Photosynthesis, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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Duchoslav M, Fischer L. Parallel subfunctionalisation of PsbO protein isoforms in angiosperms revealed by phylogenetic analysis and mapping of sequence variability onto protein structure. BMC PLANT BIOLOGY 2015; 15:133. [PMID: 26051374 PMCID: PMC4459440 DOI: 10.1186/s12870-015-0523-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 05/11/2015] [Indexed: 05/09/2023]
Abstract
BACKGROUND PsbO, the manganese-stabilising protein, is an indispensable extrinsic subunit of photosystem II. It plays a crucial role in the stabilisation of the water-splitting Mn4CaO5 cluster, which catalyses the oxidation of water to molecular oxygen by using light energy. PsbO was also demonstrated to have a weak GTPase activity that could be involved in regulation of D1 protein turnover. Our analysis of psbO sequences showed that many angiosperm species express two psbO paralogs, but the pairs of isoforms in one species were not orthologous to pairs of isoforms in distant species. RESULTS Phylogenetic analysis of 91 psbO sequences from 49 land plant species revealed that psbO duplication occurred many times independently, generally at the roots of modern angiosperm families. In spite of this, the level of isoform divergence was similar in different species. Moreover, mapping of the differences on the protein tertiary structure showed that the isoforms in individual species differ from each other on similar positions, mostly on the luminally exposed end of the β-barrel structure. Comparison of these differences with the location of differences between PsbOs from diverse angiosperm families indicated various selection pressures in PsbO evolution and potential interaction surfaces on the PsbO structure. CONCLUSIONS The analyses suggest that similar subfunctionalisation of PsbO isoforms occurred parallelly in various lineages. We speculate that the presence of two PsbO isoforms helps the plants to finely adjust the photosynthetic apparatus in response to variable conditions. This might be mediated by diverse GTPase activity, since the isoform differences predominate near the predicted GTP-binding site.
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Affiliation(s)
- Miloš Duchoslav
- Department of Experimental Plant Biology, Faculty of Science, Charles University in Prague, Viničná 5,, 128 44 Praha 2, Czech Republic.
| | - Lukáš Fischer
- Department of Experimental Plant Biology, Faculty of Science, Charles University in Prague, Viničná 5,, 128 44 Praha 2, Czech Republic.
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The extrinsic proteins of Photosystem II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2011; 1817:121-42. [PMID: 21801710 DOI: 10.1016/j.bbabio.2011.07.006] [Citation(s) in RCA: 190] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 07/11/2011] [Accepted: 07/12/2011] [Indexed: 02/08/2023]
Abstract
In this review we examine the structure and function of the extrinsic proteins of Photosystem II. These proteins include PsbO, present in all oxygenic organisms, the PsbP and PsbQ proteins, which are found in higher plants and eukaryotic algae, and the PsbU, PsbV, CyanoQ, and CyanoP proteins, which are found in the cyanobacteria. These proteins serve to optimize oxygen evolution at physiological calcium and chloride concentrations. They also shield the Mn(4)CaO(5) cluster from exogenous reductants. Numerous biochemical, genetic and structural studies have been used to probe the structure and function of these proteins within the photosystem. We will discuss the most recent proposed functional roles for these components, their structures (as deduced from biochemical and X-ray crystallographic studies) and the locations of their proposed binding domains within the Photosystem II complex. This article is part of a Special Issue entitled: Photosystem II.
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Popelkova H, Yocum CF. PsbO, the manganese-stabilizing protein: Analysis of the structure–function relations that provide insights into its role in photosystem II. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2011; 104:179-90. [DOI: 10.1016/j.jphotobiol.2011.01.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Revised: 01/13/2011] [Accepted: 01/14/2011] [Indexed: 01/07/2023]
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Roose JL, Yocum CF, Popelkova H. Binding Stoichiometry and Affinity of the Manganese-Stabilizing Protein Affects Redox Reactions on the Oxidizing Side of Photosystem II. Biochemistry 2011; 50:5988-98. [DOI: 10.1021/bi2008068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Johnna L. Roose
- Department of Biological Sciences, Division of Biochemistry and Molecular Biology, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Roose JL, Yocum CF, Popelkova H. Function of PsbO, the Photosystem II Manganese-Stabilizing Protein: Probing the Role of Aspartic Acid 157. Biochemistry 2010; 49:6042-51. [DOI: 10.1021/bi100303f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Johnna L. Roose
- Department of Biological Sciences, Division of Biochemistry and Molecular Biology, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Charles F. Yocum
- Department of Molecular, Cellular, and Developmental Biology
- Department of Chemistry
| | - Hana Popelkova
- Department of Molecular, Cellular, and Developmental Biology
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Williamson AK, Liggins JR, Hillier W, Wydrzynski T. The importance of protein-protein interactions for optimising oxygen activity in photosystem II: reconstitution with a recombinant thioredoxin--manganese stabilising protein. PHOTOSYNTHESIS RESEARCH 2007; 92:305-14. [PMID: 17484036 DOI: 10.1007/s11120-007-9165-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2006] [Accepted: 03/29/2007] [Indexed: 05/15/2023]
Abstract
In this paper we describe how photosystem II (PSII) from higher plants, which have been depleted, of the extrinsic proteins can be reconstituted with a chimeric fusion protein comprising thioredoxin from Escherichia coli and the manganese stabilising protein from Thermosynechococcus elongatus. Surprisingly, even though E. coli thioredoxin is completely unrelated to PSII, the fusion protein restores higher rates of activity upon rebinding to PSII than either the native spinach MSP, or T. elongatus MSP. PSII reconstituted with the fusion protein also has a lower requirement for calcium than PSII with the small extrinsic proteins removed, or PSII reconstituted with spinach or T. elongatus MSP. The MSP portion of the fusion protein is less thermally stable compared to isolated MSP from T. elongatus, which could be the key to its superior activation capability through greater flexibility. This work reveals the importance of protein-protein interactions in the water splitting activity of PSII and suggests that conformational configurations, which increase flexibility in MSP, are essential to its function, even when these are induced by an unrelated protein.
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Affiliation(s)
- A K Williamson
- Research School of Biological Sciences, The Australian National University, Canberra 0200, Australia.
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Tokaji Z, Tandori J, Maróti P. Light- and Redox-dependent Thermal Stability of the Reaction Center of the Photosynthetic Bacterium Rhodobacter sphaeroides¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2002)0750605lardts2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kashino Y, Inoue-Kashino N, Roose JL, Pakrasi HB. Absence of the PsbQ protein results in destabilization of the PsbV protein and decreased oxygen evolution activity in cyanobacterial photosystem II. J Biol Chem 2006; 281:20834-20841. [PMID: 16723351 DOI: 10.1074/jbc.m603188200] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have previously reported that cyanobacterial photosystem II (PS II) contains a protein homologous to PsbQ, the extrinsic 17-kDa protein found in higher plant and green algal PS II (Kashino, Y., Lauber, W. M., Carroll, J. A., Wang, Q., Whitmarsh, J., Satoh, K., and Pakrasi, H. B. (2002) Biochemistry 41, 8004-8012) and that it has regulatory role(s) on the water oxidation machinery (Thornton, L. E., Ohkawa, H., Roose, J. L., Kashino, Y., Keren, N., and Pakrasi, H. B. (2004) Plant Cell 16, 2164-2175). In this work, the localization and the function of PsbQ were assessed using the cyanobacterium Synechocystis sp. PCC 6803. From the predicted sequence, cyanobacterial PsbQ is expected to be a lipoprotein on the luminal side of the thylakoid membrane. Indeed, experiments in this work show that upon Triton X-114 fractionation of thylakoid membranes, PsbQ partitioned in the hydrophobic phase, and trypsin digestion revealed that PsbQ was highly exposed to the luminal space of thylakoid membranes. Detailed functional assays were conducted on the psbQ deletion mutant (DeltapsbQ) to analyze its water oxidation machinery. PS II complexes purified from DeltapsbQ mutant cells had impaired oxygen evolution activity and were remarkably sensitive to NH(2)OH, which indicates destabilization of the water oxidation machinery. Additionally, the cytochrome c(550) (PsbV) protein partially dissociated from purified DeltapsbQ PS II complexes, suggesting that PsbQ contributes to the stability of PsbV in cyanobacterial PS II. Therefore, we conclude that the major function of PsbQ is to stabilize the PsbV protein, thereby contributing to the protection of the catalytic Mn(4)-Ca(1)-Cl(x) cluster of the water oxidation machinery.
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Affiliation(s)
- Yasuhiro Kashino
- Department of Biology, Washington University, St. Louis, Missouri 63130; Department of Life Science, University of Hyogo, Ako-gun, Hyogo 678-1297, Japan
| | - Natsuko Inoue-Kashino
- Department of Biology, Washington University, St. Louis, Missouri 63130; Department of Life Science, University of Hyogo, Ako-gun, Hyogo 678-1297, Japan; Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Johnna L Roose
- Department of Biology, Washington University, St. Louis, Missouri 63130
| | - Himadri B Pakrasi
- Department of Biology, Washington University, St. Louis, Missouri 63130.
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Razeghifard MR, Kuzek D, Pace RJ. EPR kinetic studies of the S−1 state in spinach thylakoids. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2005; 1708:35-41. [PMID: 15882837 DOI: 10.1016/j.bbabio.2005.03.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2004] [Revised: 03/06/2005] [Accepted: 03/24/2005] [Indexed: 10/25/2022]
Abstract
The Y(Z)* decay kinetics in a formal S(-1) state, regarded as a reduced state of the oxygen evolving complex, was determined using time-resolved EPR spectroscopy. This S(-1) state was generated by biochemical treatment of thylakoid membranes with hydrazine. The steady-state oxygen evolution of the sample was used to optimize the biochemical procedure for performing EPR experiments. A high yield of the S(-1) state was generated as judged by the two-flash delay in the first maximum of oxygen evolution in Joliot flash-type experiments. We have shown that the Y(Z)* re-reduction rate by the S(-1) state is much slower than that of any other S-state transition in hydrazine-treated samples. This slow reduction rate in the S(-1) to S(0) transition, which is in the order of the S(3) to S(0) transition rate, suggests that this transition is accompanied by some structural rearrangements. Possible explanations of this unique, slow reduction rate in the S(-1) to S(0) transition are considered, in light of earlier observations by others on hydrazine/hydroxylamine reduced PS II samples.
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Affiliation(s)
- M Reza Razeghifard
- Photobioenergetics Group, Research School of Biological Sciences, The Australian National University, Canberra, 0200, Australia.
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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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Shutova T, Villarejo A, Zietz B, Klimov V, Gillbro T, Samuelsson G, Renger G. Comparative studies on the properties of the extrinsic manganese-stabilizing protein from higher plants and of a synthetic peptide of its C-terminus. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1604:95-104. [PMID: 12765766 DOI: 10.1016/s0005-2728(03)00025-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The present study describes a comparative analysis on the fluorescence properties of the manganese-stabilizing protein (MSP), a synthetic peptide corresponding to its C terminus and a 7:1 (molar ratio) mixture of N-acetyl-tyrosine and N-acetyl-tryptophan, respectively, together with reconstitution experiments of oxygen evolution in MSP-depleted photosystem II (PS II) membrane fragments. It is found: (i) at neutral pH, the fluorescence from Trp(241) is strongly diminished in MSP solutions, whereas it highly dominates the overall emission from the C-terminus peptide; (ii) at alkaline pH, the emission of Tyr and Trp is quenched in both, MSP and C-terminus peptide, with increasing pH but the decline curve is shifted by about two pH units towards the alkaline region in MSP; (iii) a drastically different pattern emerges in the 7:1 mixture where the Trp emission even slightly increases at high pH; (iv) the anisotropy of the fluorescence emission is wavelength-independent (310-395 nm) and indicative of one emitter type (Trp) in the C-terminus peptide and of two emitter types (Tyr, Trp) in MSP; and (v) in MSP-depleted PS II membrane fragments the oxygen evolution is restored (up to 85% of untreated control) by rebinding of MSP but not by the C-terminus peptide, however, the presence of the latter diminishes the restoration effect of MSP. A quenching mechanism of Trp fluorescence by a next neighbored tyrosinate in the peptide chain is proposed and the relevance of the C terminus of MSP briefly discussed.
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Affiliation(s)
- T Shutova
- Department of Plant Physiology, Umeå Plant Science Centre, Umeå University, Sweden
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Tokaji Z, Tandori J, Maróti P. Light- and redox-dependent thermal stability of the reaction center of the photosynthetic Bacterium rhodobacter sphaeroides. Photochem Photobiol 2002; 75:605-12. [PMID: 12081322 DOI: 10.1562/0031-8655(2002)075<0605:lardts>2.0.co;2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Irreversible loss of the photochemical activity and damage of the pigments (bacteriochlorophyll [Bchl] monomer, Bchl dimer [P] and bacteriopheophytin) by combined treatment with intense and continuous visible light and elevated temperature have been studied in a deoxygenated solution of reaction center (RC) protein from the nonsulfur purple photosynthetic bacterium Rhodobacter sphaeroides. Both the fraction of RC in the charge-separated redox state (P+Q-, where Q is a quinone electron acceptor) and the degradation of the pigments showed saturation as a function of increasing light intensity up to 400 mW cm(-2) (488/515 nm) or 1100 microE m(-2) s(-1) (white light). The thermal denaturation curves of the RC in the P+Q- redox state demonstrated broadening and 10-20 degrees C shift to lower temperature (after 30-90 min heat treatment) compared with those in the PQ redox state. Similar but less striking behavior was seen for RC of other redox states (P+Q and PQ-) generated either by light or by electrochemical treatment in the dark. These experiments suggest that it is not the intense light per se but the changes in the redox state of the protein that are responsible for the increased sensitivity to photo- and heat damage. The RC with a charge pair (P+Q-) is more vulnerable to elevated temperature than the RC with (P+Q or PQ-) or without (PQ) a single charge. To reveal both the thermodynamic and kinetic aspects of the denaturation, a simple three-state model of coupled reversible thermal and irreversible kinetic transitions is presented. These effects may have relevance to the heat stability of other redox proteins in bioenergetics.
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Affiliation(s)
- Zsolt Tokaji
- Institute of Biophysics, Biological Research Center of the Hungarian Academy of Sciences, Szeged
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