Where plants make oxygen: a structural model for the photosynthetic oxygen-evolving manganese cluster.
Science
; 260(5108): 675-9, 1993 Apr 30.
Article
em En
| MEDLINE
| ID: mdl-8480177
ABSTRACT
In the photosynthetic evolution of oxygen, water oxidation occurs at a catalytic site that includes four manganese atoms together with the essential cofactors, the calcium and chlorine ions. A structural model and a determination of the manganese oxidation states based on x-ray absorption spectroscopy are presented. The salient features, in both higher plants and cyanobacteria, are a pair of di-mu-oxo bridged manganese binuclear clusters linked by a mono-mu-oxo bridge, one proximal calcium atom, and one halide. In dark-adapted samples, manganese occurs in oxidation states (III) and (IV). Data from oriented membranes display distinct dichroism, precluding highly symmetrical structures for the manganese complex.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oxigênio
/
Fotossíntese
/
Modelos Moleculares
/
Complexo de Proteínas do Centro de Reação Fotossintética
/
Manganês
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Science
Ano de publicação:
1993
Tipo de documento:
Article