Journal
ISCIENCE
Volume 23, Issue 8, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.isci.2020.101366
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Funding
- Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-FG02-07ER15903, DE-FG02-03ER15393]
- Fondo Institucional para el Desarrollo de la Investigacion (FIDI)'' of the University of Puerto Rico at Cayey
- Institutional Development Award (IDeA) INBRE Grant from the National Institute of General Medical Sciences (NIGMS), a component of the National Institutes of Health (NIH) [P20GM103475]
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The photosynthetic water-oxidation reaction is catalyzed by the oxygen-evolving complex in photosystem II (PSII) that comprises the Mn4CaO5 cluster, with partic-ipation of the redox-active tyrosine residue (Y-Z) and a hydrogen-bonded network of amino acids and water molecules. It has been proposed that the strong hydrogen bond between Y-Z and D1-His190 likely renders Y-Z kinetically and ther-modynamically competent leading to highly efficient water oxidation. However, a detailed understanding of the proton-coupled electron transfer (PCET) at Y-Z re-mains elusive owing to the transient nature of its intermediate states involving Y-Z,. Herein, we employ a combination of high-resolution two-dimensional 14N hy-perfine sublevel correlation spectroscopy and density functional theory methods to investigate a bioinspired artificial photosynthetic reaction center that mimics the PCET process involving the Y-Z residue of PSII. Our results underscore the importance of proximal water molecules and charge delocalization on the elec-tronic structure of the artificial reaction center.
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