Studies on electron donation to photosystem I sites by exogenous donors in Spirulina thylakoids.
Indian J Biochem Biophys
;
1996 Dec; 33(6): 465-70
Article
Dans Anglais
| IMSEAR
| ID: sea-26676
ABSTRACT
The kinetic parameters of different sites of electron donation to photosystem I (PS I) were evaluated in Spirulina platensis thylakoids. Reduced 2,6-dichlorophenolindophenol (DCIPH2) exhibited two sites of electron donation, with apparent K(m) values of 8 and 40 microM each. The corresponding value for reduced N-tetramethyl-p-phenylenediamine (TMPDH2) and diaminodurene (DADH2) which donate electrons at a single site to PS I were 103 and 48 microM, respectively. The electron donation by these three exogenous donors were differentially inhibited by KCN (70 mM) affecting the apparent K(m) and Rmax values to varying extent. This cyanide inhibition of PS I catalyzed electron transport suggests the presence of plastocyanin in the photosynthetic electron transport chain of Spirulina platensis.
Texte intégral:
Disponible
Indice:
IMSEAR (Asie du Sud-Est)
Sujet Principal:
Consommation d'oxygène
/
Phénylènediamines
/
Plastocyanine
/
Cyanure de potassium
/
Spectrophotométrie
/
N,N,N',N'-Tétraméthyl-para-phénylènediamine
/
Cinétique
/
Chlorophylle
/
Cyanobactéries
/
Complexe protéique du centre réactionnel de la photosynthèse
langue:
Anglais
Texte intégral:
Indian J Biochem Biophys
Année:
1996
Type:
Article
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