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Membrane-inlet mass spectrometry reveals a high driving force for oxygen production by photosystem II. Proc Natl Acad Sci U S A 2011; 108:3602-7. [PMID: 21321223 DOI: 10.1073/pnas.1014249108] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Oxygenic photosynthesis is the basis for aerobic life on earth. The catalytic Mn(4)O(x)CaY(Z) center of photosystem II (PSII), after fourfold oxidation, extracts four electrons from two water molecules to yield dioxygen. This reaction cascade has appeared as a single four-electron transfer that occurs in typically 1 ms. Inevitable redox intermediates have so far escaped detection, probably because of very short lifetime. Previous attempts to stabilize intermediates by high O(2)-back pressure have revealed controversial results. Here we monitored by membrane-inlet mass spectrometry (MIMS) the production of from (18)O-labeled water against a high background of in a suspension of PSII-core complexes. We found neither an inhibition nor an altered pattern of O(2) production by up to 50-fold increased concentration of dissolved O(2). Lack of inhibition is in line with results from previous X-ray absorption and visible-fluorescence experiments, but contradictory to the interpretation of previous UV-absorption data. Because we used essentially identical experimental conditions in MIMS as had been used in the UV work, the contradiction was serious, and we found it was not to be resolved by assuming a significant slowdown of the O(2) release kinetics or a subsequent slow conformational relaxation. This calls for reevaluation of the less direct UV experiments. The direct detection of O(2) release by MIMS shows unequivocally that O(2) release in PSII is highly exothermic. Under the likely assumption that one H(+) is released in the S(4) → S(0) transition, the driving force at pH 6.5 and atmospheric O(2) pressure is at least 220 meV, otherwise 160 meV.
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Probing the quinone binding site of Photosystem II from Thermosynechococcus elongatus containing either PsbA1 or PsbA3 as the D1 protein through the binding characteristics of herbicides. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2011; 1807:119-29. [DOI: 10.1016/j.bbabio.2010.10.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 09/23/2010] [Accepted: 10/04/2010] [Indexed: 11/18/2022]
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Nilsson Lill SO. On the dimerization of chlorophyll in photosystem II. Phys Chem Chem Phys 2011; 13:16022-7. [DOI: 10.1039/c1cp21390c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sugiura M, Iwai E, Hayashi H, Boussac A. Differences in the interactions between the subunits of photosystem II dependent on D1 protein variants in the thermophilic cyanobacterium Thermosynechococcus elongatus. J Biol Chem 2010; 285:30008-18. [PMID: 20630865 DOI: 10.1074/jbc.m110.136945] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The main cofactors involved in the oxygen evolution activity of Photosystem II (PSII) are located in two proteins, D1 (PsbA) and D2 (PsbD). In Thermosynechococcus elongatus, a thermophilic cyanobacterium, the D1 protein is encoded by either the psbA(1) or the psbA(3) gene, the expression of which is dependent on environmental conditions. It has been shown that the energetic properties of the PsbA1-PSII and those of the PsbA3-PSII differ significantly (Sugiura, M., Kato, Y., Takahashi, R., Suzuki, H., Watanabe, T., Noguchi, T., Rappaport, F., and Boussac, A. (2010) Biochim. Biophys. Acta 1797, 1491-1499). In this work the structural stability of PSII upon a PsbA1/PsbA3 exchange was investigated. Two deletion mutants lacking another PSII subunit, PsbJ, were constructed in strains expressing either PsbA1 or PsbA3. The PsbJ subunit is a 4-kDa transmembrane polypeptide that is surrounded by D1 (i.e. PsbA1), PsbK, and cytochrome b(559) (Cyt b(559)) in existing three-dimensional models. It is shown that the structural properties of the PsbA3/ΔPsbJ-PSII are not significantly affected. The polypeptide contents, the Cyt b(559) properties, and the proportion of PSII dimer were similar to those found for PsbA3-PSII. In contrast, in PsbA1/ΔPsbJ-PSII the stability of the dimer is greatly diminished, the EPR properties of the Cyt b(559) likely indicates a decrease in its redox potential, and many other PSII subunits are lacking. These results shows that the 21-amino acid substitutions between PsbA1 and PsbA3, which appear to be mainly conservative, must include side chains that are involved in a network of interactions between PsbA and the other PSII subunits.
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Affiliation(s)
- Miwa Sugiura
- Department of Chemistry, Venture Business Laboratory, Cell-Free Science and Technology Research Center, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
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Sugiura M, Kato Y, Takahashi R, Suzuki H, Watanabe T, Noguchi T, Rappaport F, Boussac A. Energetics in photosystem II from Thermosynechococcus elongatus with a D1 protein encoded by either the psbA1 or psbA3 gene. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2010; 1797:1491-9. [PMID: 20362546 DOI: 10.1016/j.bbabio.2010.03.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 03/08/2010] [Accepted: 03/25/2010] [Indexed: 01/24/2023]
Abstract
The main cofactors involved in the function of Photosystem II (PSII) are borne by the D1 and D2 proteins. In some cyanobacteria, the D1 protein is encoded by different psbA genes. In Thermosynechococcus elongatus the amino acid sequence deduced from the psbA3 gene compared to that deduced from the psbA1 gene points a difference of 21 residues. In this work, PSII isolated from a wild type T. elongatus strain expressing PsbA1 or from a strain in which both the psbA1 and psbA2 genes have been deleted were studied by a range of spectroscopies in the absence or the presence of either a urea type herbicide, DCMU, or a phenolic type herbicide, bromoxynil. Spectro-electrochemical measurements show that the redox potential of PheoD1 is increased by 17 mV from -522 mV in PsbA1-PSII to -505 mV in PsbA3-PSII. This increase is about half that found upon the D1-Q130E single site directed mutagenesis in Synechocystis PCC 6803. This suggests that the effects of the D1-Q130E substitution are, at least partly, compensated for by some of the additional amino-acid changes associated with the PsbA3 for PsbA1 substitution. The thermoluminescence from the S2QA-* charge recombination and the C identical with N vibrational modes of bromoxynil detected in the non-heme iron FTIR difference spectra support two binding sites (or one site with two conformations) for bromoxynil in PsbA3-PSII instead of one in PsbA1-PSII which suggests differences in the QB pocket. The temperature dependences of the S2QA-* charge recombination show that the strength of the H-bond to PheoD1 is not the only functionally relevant difference between the PsbA3-PSII and PsbA1-PSII and that the environment of QA (and, as a consequence, its redox potential) is modified as well. The electron transfer rate between P680+* and YZ is found faster in PsbA3 than in PsbA1 which suggests that the redox potential of the P680/P680+* couple (and hence that of 1P680*/P680+*) is tuned as well when shifting from PsbA1 to PsbA3. In addition to D1-Q130E, the non-conservative amongst the 21 amino acid substitutions, D1-S270A and D1-S153A, are proposed to be involved in some of the observed changes.
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Affiliation(s)
- Miwa Sugiura
- Cell-Free Science and Technology Research Center, Ehime University, Bunkyo-cho, Matsuyama Ehime, 790-8577, Japan.
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56
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Shibamoto T, Kato Y, Nagao R, Yamazaki T, Tomo T, Watanabe T. Species-dependence of the redox potential of the primary quinone electron acceptor QA
in photosystem II verified by spectroelectrochemistry. FEBS Lett 2010; 584:1526-30. [PMID: 20211622 DOI: 10.1016/j.febslet.2010.03.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2009] [Revised: 03/01/2010] [Accepted: 03/01/2010] [Indexed: 10/19/2022]
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Allakhverdiev SI, Tomo T, Shimada Y, Kindo H, Nagao R, Klimov VV, Mimuro M. Redox potential of pheophytin a in photosystem II of two cyanobacteria having the different special pair chlorophylls. Proc Natl Acad Sci U S A 2010; 107:3924-9. [PMID: 20142495 PMCID: PMC2840487 DOI: 10.1073/pnas.0913460107] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Water oxidation by photosystem (PS) II in oxygenic photosynthetic organisms is a major source of energy on the earth, leading to the production of a stable reductant. Mechanisms generating a high oxidation potential for water oxidation have been a major focus of photosynthesis research. This potential has not been estimated directly but has been measured by the redox potential of the primary electron acceptor, pheophytin (Phe) a. However, the reported values for Phe a are still controversial. Here, we measured the redox potential of Phe a under physiological conditions (pH 7.0; 25 degrees C) in two cyanobacteria with different special pair chlorophylls (Chls): Synechocystis sp. PCC 6803, whose special pair for PS II consists of Chl a, and Acaryochloris marina MBIC 11017, whose special pair for PS II consists of Chl d. We obtained redox potentials of -536 +/- 8 mV for Synechocystis sp. PCC 6803 and -478 +/- 24 mV for A. marina on PS II complexes in the presence of 1.0 M betaine. The difference in the redox potential of Phe a between the two species closely corresponded with the difference in the light energy absorbed by Chl a versus Chl d. We estimated the potentials of the special pair of PS II to be 1.20 V and 1.18 V for Synechocystis sp. PCC 6803 (P680) and A. marina (P713), respectively. This clearly indicates conservation in the properties of water-oxidation systems in oxygenic photosynthetic organisms, irrespective of the special-pair chlorophylls.
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Affiliation(s)
- Suleyman I. Allakhverdiev
- Institute of Basic Biological Problems, Russian Academy of Science, Pushchino, Moscow Region 142290, Russia
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
| | - Tatsuya Tomo
- Faculty of Science, Tokyo University of Sciences, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan; and
| | - Yuichiro Shimada
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
| | - Hayato Kindo
- Faculty of Science, Tokyo University of Sciences, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan; and
| | - Ryo Nagao
- Department of Life Sciences (Biology), Graduate School of Art and Sciences, University of Tokyo, Tokyo 153-8902, Japan
| | - Vyacheslav V. Klimov
- Institute of Basic Biological Problems, Russian Academy of Science, Pushchino, Moscow Region 142290, Russia
| | - Mamoru Mimuro
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
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Shibuya Y, Takahashi R, Okubo T, Suzuki H, Sugiura M, Noguchi T. Hydrogen Bond Interactions of the Pheophytin Electron Acceptor and Its Radical Anion in Photosystem II As Revealed by Fourier Transform Infrared Difference Spectroscopy. Biochemistry 2009; 49:493-501. [DOI: 10.1021/bi9018829] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yuichi Shibuya
- Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Ryouta Takahashi
- Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Tatsunori Okubo
- Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Hiroyuki Suzuki
- Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Miwa Sugiura
- Cell-Free Science and Technology Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Takumi Noguchi
- Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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Shibamoto T, Kato Y, Sugiura M, Watanabe T. Redox Potential of the Primary Plastoquinone Electron Acceptor QA in Photosystem II from Thermosynechococcus elongatus Determined by Spectroelectrochemistry. Biochemistry 2009; 48:10682-4. [PMID: 19835366 DOI: 10.1021/bi901691j] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tadao Shibamoto
- Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Yuki Kato
- Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Miwa Sugiura
- Cell-Free Science and Technology Research Center, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
| | - Tadashi Watanabe
- Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Affiliation(s)
- My Hang V Huynh
- DE-1: High Explosive Science and Technology Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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