Duroquinol as an electron donor for chloroplast electron transfer reactions.
Biochim Biophys Acta
; 502(1): 127-37, 1978 Apr 11.
Article
em En
| MEDLINE
| ID: mdl-638137
ABSTRACT
Duroquinol (tetramethylhydroquinone) was found to function as an electron donor in chloroplasts. Non-cyclic electron transfer from duroquinol to electron acceptors such as oxygen proceeded at high rates, was insensitive to 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) but was sensitive to the plastoquinone antagonist 2,5-dibromo-3-methyl-6-isopropyl-1,4-benzoquinone (DBMIB). The electron transport from duroquinol was coupled to the synthesis of ATP. Spectroscopic studies of chloroplast electron carriers in the dark indicated the high-potential "Rieske" iron-sulfur center, cytochrome f, plastocyanin and P-700 were all reduced by duroquinol. The dark reduction of the "Rieske" iron-sulfur center and cytochrome f were inhibited by DBMIB but not by DCMU. These results have been interpreted in terms of a linear sequence of electron carriers in the non-cyclic electron transport chain which includes plastoquinone, the "Rieske" iron-sulfur center, cytochrome f, plastocyanin and P-700.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cloroplastos
/
Hidroquinonas
Idioma:
En
Ano de publicação:
1978
Tipo de documento:
Article