Structural Changes in the Acceptor Site of Photosystem II Upon Ca/Sr Exchange in the MnCaO Cluster Site and the Possible Long-Range Interactions

Overview

Journal Biomolecules

Publisher MDPI

Specialties Biochemistry
Molecular Biology

Date 2019 Aug 17

PMID 31416291

Citations 3

Authors

Faisal Hammad Mekky Koua

Affiliations

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Abstract

The MnCaO cluster site in the oxygen-evolving complex (OEC) of photosystem II (PSII) undergoes structural perturbations, such as those induced by Ca/Sr 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 (Q), 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, MnCa(Sr)O cluster, and acceptor sites.

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