{"title":"光系统高效析氧ⅱ析氧配合物，每个反应中心含3Mn","authors":"Boris К. Semin, Lira N. Davletshina","doi":"10.1007/s00775-023-01987-2","DOIUrl":null,"url":null,"abstract":"<div><p>Ca-depleted photosystem II membranes obtained by treatment with acidic buffer do not contain Ca<sup>2+</sup> in the Mn<sub>4</sub>CaO<sub>5</sub> cluster but contain all extrinsic proteins protecting this cluster (PSII(-Ca/low pH)). However, unlike native photosystem II, Mn cluster in PSII(-Ca/low pH) samples is available for small-sized reductants. Using this property, we investigated the substitution possibility of Mn cation(s) with Fe cation(s) to obtain a chimeric cluster in PSII(-Ca/low pH) samples containing extrinsic proteins. We found that Fe(II) cation replaces Mn cation at pH 6.5, however, PSII(-Ca/low pH) membranes with the 3Mn1Fe chimeric cluster in the oxygen-evolving complex evolve O<sub>2</sub> with high intensity in the presence of exogenous Ca<sup>2+</sup>. The O<sub>2</sub> evolution rate is about 80% of the same rate in PSII(-Ca/low pH) membranes.</p><h3>Graphical abstract</h3>\n <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\n </div>","PeriodicalId":603,"journal":{"name":"JBIC Journal of Biological Inorganic Chemistry","volume":"28 4","pages":"393 - 401"},"PeriodicalIF":2.7000,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"High-efficiency oxygen evolution by photosystem II oxygen-evolving complex containing 3Mn per reaction center\",\"authors\":\"Boris К. Semin, Lira N. Davletshina\",\"doi\":\"10.1007/s00775-023-01987-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Ca-depleted photosystem II membranes obtained by treatment with acidic buffer do not contain Ca<sup>2+</sup> in the Mn<sub>4</sub>CaO<sub>5</sub> cluster but contain all extrinsic proteins protecting this cluster (PSII(-Ca/low pH)). However, unlike native photosystem II, Mn cluster in PSII(-Ca/low pH) samples is available for small-sized reductants. Using this property, we investigated the substitution possibility of Mn cation(s) with Fe cation(s) to obtain a chimeric cluster in PSII(-Ca/low pH) samples containing extrinsic proteins. We found that Fe(II) cation replaces Mn cation at pH 6.5, however, PSII(-Ca/low pH) membranes with the 3Mn1Fe chimeric cluster in the oxygen-evolving complex evolve O<sub>2</sub> with high intensity in the presence of exogenous Ca<sup>2+</sup>. The O<sub>2</sub> evolution rate is about 80% of the same rate in PSII(-Ca/low pH) membranes.</p><h3>Graphical abstract</h3>\\n <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\\n </div>\",\"PeriodicalId\":603,\"journal\":{\"name\":\"JBIC Journal of Biological Inorganic Chemistry\",\"volume\":\"28 4\",\"pages\":\"393 - 401\"},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2023-04-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"JBIC Journal of Biological Inorganic Chemistry\",\"FirstCategoryId\":\"1\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s00775-023-01987-2\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"BIOCHEMISTRY & MOLECULAR BIOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"JBIC Journal of Biological Inorganic Chemistry","FirstCategoryId":"1","ListUrlMain":"https://link.springer.com/article/10.1007/s00775-023-01987-2","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"BIOCHEMISTRY & MOLECULAR BIOLOGY","Score":null,"Total":0}
High-efficiency oxygen evolution by photosystem II oxygen-evolving complex containing 3Mn per reaction center
Ca-depleted photosystem II membranes obtained by treatment with acidic buffer do not contain Ca2+ in the Mn4CaO5 cluster but contain all extrinsic proteins protecting this cluster (PSII(-Ca/low pH)). However, unlike native photosystem II, Mn cluster in PSII(-Ca/low pH) samples is available for small-sized reductants. Using this property, we investigated the substitution possibility of Mn cation(s) with Fe cation(s) to obtain a chimeric cluster in PSII(-Ca/low pH) samples containing extrinsic proteins. We found that Fe(II) cation replaces Mn cation at pH 6.5, however, PSII(-Ca/low pH) membranes with the 3Mn1Fe chimeric cluster in the oxygen-evolving complex evolve O2 with high intensity in the presence of exogenous Ca2+. The O2 evolution rate is about 80% of the same rate in PSII(-Ca/low pH) membranes.
期刊介绍：
Biological inorganic chemistry is a growing field of science that embraces the principles of biology and inorganic chemistry and impacts other fields ranging from medicine to the environment. JBIC (Journal of Biological Inorganic Chemistry) seeks to promote this field internationally. The Journal is primarily concerned with advances in understanding the role of metal ions within a biological matrix—be it a protein, DNA/RNA, or a cell, as well as appropriate model studies. Manuscripts describing high-quality original research on the above topics in English are invited for submission to this Journal. The Journal publishes original articles, minireviews, and commentaries on debated issues.
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