A synthetic Mn4Ca-cluster mimicking the oxygen-evolving center of photosynthesis

Photosynthetic splitting of water into oxygen by plants, algae, and cyanobacteria is catalyzed by the oxygen-evolving center (OEC). Synthetic mimics of the OEC, which is composed of an asymmetric manganese-calcium-oxygen cluster bound to protein groups, may promote insight into the structural and ch...

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Published in:Science (American Association for the Advancement of Science) 2015-05, Vol.348 (6235), p.690-693
Main Authors: Zhang, Chunxi, Chen, Changhui, Dong, Hongxing, Shen, Jian-Ren, Dau, Holger, Zhao, Jingquan
Format: Article
Language:English
Subjects:
Binding sites
Catalysis
Catalysts
Clusters
Cyanobacteria
Evolution
Ligands
Oxygen
Photocatalysis
Photosynthesis
Plant sciences
Proteins
Splitting
Water
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container_issue 6235
container_start_page 690
container_title Science (American Association for the Advancement of Science)
container_volume 348
creator Zhang, Chunxi
Chen, Changhui
Dong, Hongxing
Shen, Jian-Ren
Dau, Holger
Zhao, Jingquan
description Photosynthetic splitting of water into oxygen by plants, algae, and cyanobacteria is catalyzed by the oxygen-evolving center (OEC). Synthetic mimics of the OEC, which is composed of an asymmetric manganese-calcium-oxygen cluster bound to protein groups, may promote insight into the structural and chemical determinants of biological water oxidation and lead to development of superior catalysts for artificial photosynthesis. We synthesized a Mn4Ca-cluster similar to the native OEC in both the metal-oxygen core and the binding protein groups. Like the native OEC, the synthetic cluster can undergo four redox transitions and shows two magnetic resonance signals assignable to redox and structural isomerism. Comparison with previously synthesized Mn3CaO4-cubane clusters suggests that the fourth Mn ion determines redox potentials and magnetic properties of the native OEC.
doi_str_mv 10.1126/science.aaa6550
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source Science Magazine; JSTOR Archival Journals and Primary Sources Collection; Alma/SFX Local Collection
subjects Binding sites
Catalysis
Catalysts
Clusters
Cyanobacteria
Evolution
Ligands
Oxygen
Photocatalysis
Photosynthesis
Plant sciences
Proteins
Splitting
Water
title A synthetic Mn4Ca-cluster mimicking the oxygen-evolving center of photosynthesis
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