Role for manganese in oxygen evolution in photosynthesis

Journal Article · Fri Aug 01 04:00:00 EDT 1980 · Acc. Chem. Res.; (United States)

DOI:https://doi.org/10.1021/ar50152a001· OSTI ID:5032713

Sauer, K

Results of studies of the role of Mn in oxygen evolution from the action of light (> 300 nm) on water during photosynthesis are reviewed. Experimental observations on the oxidation states of Mn during the photochemical process are correlated with other reported data to establish the role of the water-splitting Mn complex. The proposed reaction scheme involves two Mn atoms in close proximity to each other in a single complex with ligands derived from protein amino acid side chains or from water. In the most reduced state, both Mn atoms are postulated to be in the +2 oxidation state. The detailed structure of the complex has not yet been determined. Oxidation state changes involving Mn(II), Mn(III), and probably Mn(IV) are indicated during the reaction. An intermediate species in the reaction scheme appears to involve a bound form of partially oxidized water. A chlorophyll monomer has been proposed as the strong oxidant that removes electrons one at a time from the complex. (BLM)

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 5032713
• Journal Information: Acc. Chem. Res.; (United States), Journal Name: Acc. Chem. Res.; (United States) Vol. 13:8; ISSN ACHRE
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080106* -- Hydrogen-- Production-- Biosynthesis & Photochemical Processes
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
INFORMATION
MANGANESE COMPLEXES
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOSYNTHESIS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
WATER