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Structural Changes in the Acceptor Site of Photosystem II upon Ca2+/Sr2+ Exchange in the Mn4CaO5 Cluster Site and the Possible Long-Range Interactions

1
Center for Free Electron Laser Science, Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, Hamburg 22607, Germany
2
National University Biomedical Research Institute, National University-Sudan, Air St. P.O. Box 3783, Khartoum 11111, Sudan
Biomolecules 2019, 9(8), 371; https://doi.org/10.3390/biom9080371
Received: 19 July 2019 / Accepted: 12 August 2019 / Published: 14 August 2019
(This article belongs to the Section Molecular Structure and Dynamics)
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Abstract

The Mn4CaO5 cluster site in the oxygen-evolving complex (OEC) of photosystem II (PSII) undergoes structural perturbations, such as those induced by Ca2+/Sr2+ exchanges or Ca/Mn removal. These changes have been known to induce long-range positive shifts (between +30 and +150 mV) in the redox potential of the primary quinone electron acceptor plastoquinone A (QA), which is located 40 Å from the OEC. To further investigate these effects, we reanalyzed the crystal structure of Sr-PSII resolved at 2.1 Å and compared it with the native Ca-PSII resolved at 1.9 Å. Here, we focus on the acceptor site and report the possible long-range interactions between the donor, Mn4Ca(Sr)O5 cluster, and acceptor sites. View Full-Text
Keywords: photosystem II; redox potential; electron transfer; charge separation; photoinhibition; water oxidation photosystem II; redox potential; electron transfer; charge separation; photoinhibition; water oxidation
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Koua, F.H.M. Structural Changes in the Acceptor Site of Photosystem II upon Ca2+/Sr2+ Exchange in the Mn4CaO5 Cluster Site and the Possible Long-Range Interactions. Biomolecules 2019, 9, 371.

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