Current analysis of cations substitution in the oxygen-evolving complex of photosystem II.

IF 4.9 Q1 BIOPHYSICS
Biophysical reviews Pub Date : 2024-04-30 eCollection Date: 2024-04-01 DOI:10.1007/s12551-024-01186-6
Boris Semin, Aleksey Loktyushkin, Elena Lovyagina
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引用次数: 0

Abstract

Water oxidation in photosystem II (PSII) is performed by the oxygen-evolving complex Mn4CaO5 which can be extracted from PSII and then reconstructed using exogenous cations Mn(II) and Ca2+. The binding efficiency of other cations to the Mn-binding sites in Mn-depleted PSII was investigated without any positive results. At the same time, a study of the Fe cations interaction with Mn-binding sites showed that it binds at a level comparable with the binding of Mn cations. Binding of Fe(II) cations first requires its light-dependent oxidation. In general, the interaction of Fe(II) with Mn-depleted PSII has a number of features similar to the two-quantum model of photoactivation of the complex with the release of oxygen. Interestingly, incubation of Ca-depleted PSII with Fe(II) cations under certain conditions is accompanied by the formation of a chimeric cluster Mn/Fe in the oxygen-evolving complex. PSII with the cluster 2Mn2Fe was found to be capable of water oxidation, but only to the H2O2 intermediate. However, the cluster 3Mn1Fe can oxidize water to O2 with an efficiency about 25% of the original in the absence of extrinsic proteins PsbQ and PsbP. In the presence of these proteins, the efficiency of O2 evolution can reach 80% of the original when adding exogenous Ca2+. In this review, we summarized information on the formation of chimeric Mn-Fe clusters in the oxygen-evolving complex. The data cited may be useful for detailing the mechanism of water oxidation.

光系统 II 氧发生复合体中阳离子置换的电流分析。
光系统 II(PSII)中的水氧化作用是由氧发生复合物 Mn4CaO5 完成的,该复合物可以从 PSII 中提取,然后利用外源阳离子 Mn(II)和 Ca2+ 进行重建。对其他阳离子与缺锰的 PSII 中的锰结合位点的结合效率进行了研究,但没有得出任何积极的结果。同时,对铁阳离子与锰结合位点相互作用的研究表明,其结合水平与锰阳离子的结合水平相当。铁(II)阳离子的结合首先需要光的氧化作用。总的来说,Fe(II)与去锰的 PSII 的相互作用具有一些与复合物光激活释放氧的双量子模型相似的特征。有趣的是,在某些条件下,用 Fe(II)阳离子培养贫钙 PSII 会在氧发生复合物中形成 Mn/Fe 嵌合簇。研究发现,带有 2Mn2Fe 簇的 PSII 能够进行水氧化,但只能氧化成 H2O2 中间产物。然而,在没有外在蛋白 PsbQ 和 PsbP 的情况下,簇 3Mn1Fe 能将水氧化成 O2,效率约为原来的 25%。在有这些蛋白存在的情况下,加入外源 Ca2+ 时,O2 的进化效率可达到原来的 80%。在本综述中,我们总结了氧进化复合体中嵌合锰-铁簇形成的相关信息。所引用的数据可能有助于详细说明水氧化的机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Biophysical reviews
Biophysical reviews Biochemistry, Genetics and Molecular Biology-Biophysics
CiteScore
8.90
自引率
0.00%
发文量
93
期刊介绍: Biophysical Reviews aims to publish critical and timely reviews from key figures in the field of biophysics. The bulk of the reviews that are currently published are from invited authors, but the journal is also open for non-solicited reviews. Interested authors are encouraged to discuss the possibility of contributing a review with the Editor-in-Chief prior to submission. Through publishing reviews on biophysics, the editors of the journal hope to illustrate the great power and potential of physical techniques in the biological sciences, they aim to stimulate the discussion and promote further research and would like to educate and enthuse basic researcher scientists and students of biophysics. Biophysical Reviews covers the entire field of biophysics, generally defined as the science of describing and defining biological phenomenon using the concepts and the techniques of physics. This includes but is not limited by such areas as: - Bioinformatics - Biophysical methods and instrumentation - Medical biophysics - Biosystems - Cell biophysics and organization - Macromolecules: dynamics, structures and interactions - Single molecule biophysics - Membrane biophysics, channels and transportation
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