Plastocyanin/cytochrome c6 interchange in Scenedesmus vacuolatus.
Plastocyanin and cytochrome c6 from the green alga Scenedesmus vacuolatus were immunoquantified in cells grown under different concentrations of copper and iron. Plastocyanin expression was constitutive, its synthesis was not significantly affected by iron availability, and increases with copper availability. On the contrary, cytochrome c6 synthesis is repressed by copper, and only residual amounts of the protein were detected at 0.1 micromol/L copper. Under copper deficiency, cytochrome c6 is slightly dependent on iron. In natural environments, plastocyanin seems to be the predominant electron donor to P700.
Miramar
M Dolores
MD
Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, 50009-Zaragoza, Spain.
Inda
Luis A
LA
Saraiva
Lígia M
LM
Peleato
M Luisa
ML
D003300:Copper / Q000494:pharmacology; D045365:Cytochromes c6 / Q000096:biosynthesis*; D007120:Immunochemistry; D007501:Iron / Q000494:pharmacology; D010970:Plastocyanin / Q000096:biosynthesis*; D044444:Scenedesmus / Q000187:drug effects / Q000378:metabolism*
D045365:Cytochromes c6; D003300:Copper; D010970:Plastocyanin; D007501:Iron