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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ishida, Naoko Boussac, Alain Shibamoto, Tadao Watanabe, Tadashi Yamamoto, Shoichi Sugiura, Miwa Kato, Yuki Rappaport, Fabrice |
| Description | Author Affiliation: Kato Y ( Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan. yuki.kato@bio.phys.nagoya-u.ac.jp) |
| Abstract | Ca $^{2+}$ and Cl $^{−}$ ions are essential elements for the oxygen evolution activity of photosystem II (PSII). It has been demonstrated that these ions can be exchanged with Sr $^{2+}$ and Br $^{−}$ , respectively, and that these ion exchanges modify the kinetics of some electron transfer reactions at the Mn $_{4}$ Ca cluster level (Ishida et al. , J. Biol. Chem. 283 (2008) 13330–13340). It has been proposed from thermoluminescence experiments that the kinetic effects arise, at least in part, from a decrease in the free energy level of the Mn $_{4}$ Ca cluster in the S $_{3}$ state though some changes on the acceptor side were also observed. Therefore, in the present work, by using thin-layer cell spectroelectrochemistry, the effects of the Ca $^{2+}$ /Sr $^{2+}$ and Cl $^{−}$ /Br $^{−}$ exchanges on the redox potential of the primary quinone electron acceptor Q $_{A}$ , $E_{m}$ (Q $_{A}$ /Q $_{A}^{−}$ ), were investigated. Since the previous studies on the Ca $^{2+}$ /Sr $^{2+}$ and Cl $^{−}$ /Br $^{−}$ exchanges were performed in PsbA3-containing PSII purified from the thermophilic cyanobacterium Thermosynechococcus elongatus , we first investigated the influences of the PsbA1/PsbA3 exchange on $E_{m}$ (Q $_{A}$ /Q $_{A}^{−}$ ). Here we show that i) the $E_{m}$ (Q $_{A}$ /Q $_{A}^{−}$ ) was up-shifted by ca. + 38 mV in PsbA3-PSII when compared to PsbA1-PSII and ii) the Ca $^{2+}$ /Sr $^{2+}$ exchange up-shifted the $E_{m}$ (Q $_{A}$ /Q $_{A}^{−}$ ) by ca. + 27 mV, whereas the Cl $^{−}$ /Br $^{−}$ exchange hardly influenced $E_{m}$ (Q $_{A}$ /Q $_{A}^{−}$ ). On the basis of the results of $E_{m}$ (Q $_{A}$ /Q $_{A}^{−}$ ) together with previous thermoluminescence measurements, the ion-exchange effects on the energetics in PSII are discussed. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 11 |
| Volume Number | 1817 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-11-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Bromides Metabolism Calcium Chlorides Photosystem II Protein Complex Physiology Quinones Chemistry Strontium Synechococcus Electrochemical Techniques Electron Transport Oxidation-Reduction Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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