Pteridines and the function of the photosynthetic reaction center.
Proc Natl Acad Sci U S A
; 63(4): 1311-8, 1969 Aug.
Article
em En
| MEDLINE
| ID: mdl-5260934
ABSTRACT
The photoreduction and interaction with the photosynthetic "reaction center" of 2-amino,4-hydroxy-6-substituted pteridine indicates that these low-potential ( approximately -0.7 v), naturally occurring compounds play a primary role in photosynthetic electron transport. These unconjugated pteridines, which occur in association with the photosynthetic apparatus of green plants and photosynthetic bacteria, can be reduced by light in the presence of a bacterial chromatophore fraction from the dihydro form to the tetrahydro form. 6,7-Dimethyl-tetrahydropteridine readily reduces spinach ferredoxin. This compound also specifically interacts with reaction-center chlorophyll and bacteriochlorophyll and produces spectral shifts similar to those produced by light. It is proposed that the electron produced by excited-state chlorophyll is captured and separated by a pteridine at -0.67 v at the photosynthetic reaction center.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fotossíntese
/
Pteridinas
/
Transporte de Elétrons
Idioma:
En
Ano de publicação:
1969
Tipo de documento:
Article