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EPR spectroscopic evidence for a tetranuclear manganese cluster as the site for photosynthetic oxygen evolution

Journal Article:

Abstract

It has been shown that EPR observations of a polynuclear Mn cluster in spinach chloroplasts can be interpreted in terms of a cluster containing three Mn(III) ions and one Mn(IV) ion within a tetranuclear complex. Both ferromagnetic and antiferromagnetic interactions appear to exist between the Mn ions, which exhibit deeply trapped discrete oxidation states, at least in this EPR active state. These results are discussed in terms of what is currently known about the polypeptide composition of the enzyme. A model of the oxidation state changes in the enzyme is proposed which is consistent with the EPR and protein isolation studies. Finally, a comparison between the electron-transporting metalloenzymes and the electron-storing metalloenzymes shows that the facile electron transfer kinetics observed in the former class and the slow kinetics observed in the latter class are consistent with the distinctly different electronic structures of these enzymes and their functional roles.
Publication Date:
Jan 01, 1982
Product Type:
Journal Article
Reference Number:
ERA-10-000393; EDB-84-183359
Resource Relation:
Journal Name: Photobiochem. Photobiophys.; (Netherlands); Journal Volume: 3
Subject:
14 SOLAR ENERGY; CHLOROPHYLL; PHOTOCHEMICAL REACTIONS; CHLOROPLASTS; PHOTOSYNTHESIS; SPINACH; MANGANESE; BIOCHEMICAL REACTION KINETICS; OXYGEN; BIOLOGICAL EVOLUTION; WATER; OXIDATION; ELECTRON SPIN RESONANCE; ENZYME ACTIVITY; CARBOXYLIC ACIDS; CELL CONSTITUENTS; CHEMICAL REACTIONS; ELEMENTS; FOOD; HETEROCYCLIC ACIDS; HETEROCYCLIC COMPOUNDS; HYDROGEN COMPOUNDS; KINETICS; MAGNETIC RESONANCE; METALS; NONMETALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXYGEN COMPOUNDS; PHYTOCHROMES; PIGMENTS; PLANTS; PORPHYRINS; REACTION KINETICS; RESONANCE; SYNTHESIS; TRANSITION ELEMENTS; VEGETABLES; 140505* - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-)
OSTI ID:
6526409
Research Organizations:
Princeton Univ., NJ
Country of Origin:
Netherlands
Language:
English
Contract Number:
FG02-80CS84003
Other Identifying Numbers:
Journal ID: CODEN: PHOPD
Submitting Site:
CHO
Size:
Pages: 243-256
Announcement Date:

Journal Article:

Citation Formats

Dismukes, G C, Ferris, K, and Watnick, P. EPR spectroscopic evidence for a tetranuclear manganese cluster as the site for photosynthetic oxygen evolution. Netherlands: N. p., 1982. Web.
Dismukes, G C, Ferris, K, & Watnick, P. EPR spectroscopic evidence for a tetranuclear manganese cluster as the site for photosynthetic oxygen evolution. Netherlands.
Dismukes, G C, Ferris, K, and Watnick, P. 1982. "EPR spectroscopic evidence for a tetranuclear manganese cluster as the site for photosynthetic oxygen evolution." Netherlands.
@misc{etde_6526409,
title = {EPR spectroscopic evidence for a tetranuclear manganese cluster as the site for photosynthetic oxygen evolution}
author = {Dismukes, G C, Ferris, K, and Watnick, P}
abstractNote = {It has been shown that EPR observations of a polynuclear Mn cluster in spinach chloroplasts can be interpreted in terms of a cluster containing three Mn(III) ions and one Mn(IV) ion within a tetranuclear complex. Both ferromagnetic and antiferromagnetic interactions appear to exist between the Mn ions, which exhibit deeply trapped discrete oxidation states, at least in this EPR active state. These results are discussed in terms of what is currently known about the polypeptide composition of the enzyme. A model of the oxidation state changes in the enzyme is proposed which is consistent with the EPR and protein isolation studies. Finally, a comparison between the electron-transporting metalloenzymes and the electron-storing metalloenzymes shows that the facile electron transfer kinetics observed in the former class and the slow kinetics observed in the latter class are consistent with the distinctly different electronic structures of these enzymes and their functional roles.}
journal = {Photobiochem. Photobiophys.; (Netherlands)}
volume = {3}
journal type = {AC}
place = {Netherlands}
year = {1982}
month = {Jan}
}