NDLI: New structure model of oxygen-evolving center and mechanism for oxygen evolution in photosynthesis

Content Provider	Springer Nature Link
Author	Zhang, Chunxi Pan, Jie Li, Liangbi Kuang, Tingyun
Copyright Year	1999
Abstract	So far, many important questions and problems concerning the structure and mechanism of photosynthetic oxygen evolution are still unsolved. On the basis of recent achievements in this field, a new structure model is proposed whereby two H$_{2}$O molecules bind asymmetrically to two manganese ions (Mn 1 II and Mn 4 III ) at the open end of “C” shaped cluster and keep rather large distance. Two histidine residues coordinate to the other two manganese ions in higher oxidation state (Mn 2 IV and Mn 3 IV ) through their nitrogen atoms of the imidazole. CI bound as terminal ligand to Mn 4 III is connected to Ca, and the latter is needed to maintain the special configuration of two Mn2O2 units by bridged-oxo and bridged-carboxylate ligands. The whole structure of oxygen evolution center is asymmetry. A new mechanism for oxygen evolution invokes predictions of asymmetric oxidation of two H$_{2}$O molecules, dynamic structural changes of oxygen evolving center and indirect proton transport, etc. Only in S$_{2}$ state, could Mn 1 IV = O, intermediate with high oxidation potential be formed. The S$_{2}$→ S$_{3}$ process occurs with significant structural changes, as well as intramolecular and intermolecular hydrogen transfer. The S$_{3}$ state corresponds to intermediate of Mn 1 IV -O … H … O-Mn 4 IV . During S$_{3}$ → [S$_{4}$] → S$_{0}$, the 0-0 bond is formed only in S$_{4}$ state. The change of nucleophilic interaction between Cl and manganese ions different oxidation states has consequence for the significant structural changes in H$_{2}$O oxidation process.
Starting Page	2209
Ending Page	2215
Page Count	7
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	44
Issue Number	24
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	1999-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	photosynthesis photosystem II oxygen-evolving center mechanism of oxygen evolution Life Sciences Physics Chemistry/Food Science Science Geosciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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