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Inhibition of Millisecond Luminescence by Copper(II) in Spinach Chloroplasts
- Vierke, Gerhard, Struckmeier, Peter
- Zeitschrift für Naturforschung 2014 v.33 no.3-4 pp. 266-270
- Spinacia oleracea, chloroplasts, copper, luminescence, membrane proteins, pH, photophosphorylation, photosystem II, poisoning, spinach
- Intoxication of class II chloroplasts of spinach with Cu(II) leads to inhibition of millisecond luminescence. The degree of inhibition depends on Cu (II) -concentration. The investgation of the pH dpendence of the inhibition curve of luminescence revealed that (1) there is an inhibition site of copper on the donor side of photosystem II, (2) copper (II) does not act as an uncoupler of photophosphorylation, (3) a protonation equilibrium is involved in the inhibition mechanism, and (4) copper (II) binds to a dissociated residue of a membrane protein.