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Inhibition of oxygen evolution by zaluzanin C
B Lotina-Hennsen1, E Bernal-Morales, A Roo De Vivar
1Departmento de Bioquímica, Facultad de Quùmica, Universidad National Autönoma de Mêxico Ciudad Universitaria, 04510, Mêxico, D. F..
Abstract:
The inhibition of ATP synthesis, proton uptake, and electron transport (basal, phosphorylating, and uncoupled) from water to methylviologen by zaluzanin C indicates that it acts as an electron transport inhibitor. Uncoupled photosystem I electron transport rate was not affected by zaluzanin C; however, uncoupled photosystem II electron flow from water to 2,3,5,6-tetramethyl phenylenediamine and from water to silicomolybdate was inhibited, but electron transport from diphenylcarbazide to silicomolybdate was not affected. We conclude that the site of inhibition by zaluzanin C is located at the oxygen evolution level.
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