Network of hydrogen bonds near the oxygen-evolving Mn 4 CaO 5 cluster of Photosystem II probed with FTIR difference spectroscopy
We previously provided experimental evidence that an extensive network of hydrogen bonds exists near the oxygen-evolving Mn4CaO5 cluster in photosystem II and that elements of this network form part of a dominant proton-egress pathway leading from the Mn4CaO5 cluster to the thylakoid lumen. The evidence was based on (i) the elimination of the same ν(C=O) mode of a protonated carboxylate group in the S 2-minus-S1 FTIR difference spectrum of wild-type PSII core complexes from the cyanobacterium...[Show more]
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