2019
Biomolecules 9(8), 371 (2019). doi:10.3390/biom9080371
The Mn4CaO5 cluster site in the oxygen-evolving complex (OEC) of photosystem II (PSII) undergoes structural perturbations, such as those induced by Ca$^{2+}$/Sr$^{2+}$ 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, Mn$_4$Ca(Sr)O$_5$ cluster, and acceptor sites.
Published by MDPI, Basel
10.3204/PUBDB-2019-03171
en
2019
Deutsches Elektronen-Synchrotron, DESY, Hamburg
10.3390/biom9080371
Journal article
pages 371
570
Structural changes in the acceptor site of photosystem II upon Ca$^{2+}$/Sr$^{2+}$ exchange in the Mn$_4$CaO$_5$ Cluster Site and the Possible Long-Range Interactions
Hammad Mekky Koua, Faisal
Deutsches Elektronen-Synchrotron
Centre for Free-Electron Laser Science