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The inhibitory effects of copper ion (Cu 2+ ) on the photosynthetic electron transport func­tion was investigated both in NaCl washed (depleted in 17 and 23 kDa polypeptides) and native (unwashed) photosystem II membrane preparations from spinach (Beta vulgaris) chlo-roplasts. Copper in the range of 2.0 to 15 μᴍ strongly inhibited the electron flow from water to 2,6-dichlorobenzoquinone in NaCl washed particles in a concentration dependent manner. Com plete inhibition was noticed at 15 μᴍ Cu 2+ . Oppositely in native membranes, 15 μᴍ C u 2+  inhibited only 10-12% of control activity. It was found that calcium ion (Ca 2+ ) significantly reduced the Cu 2+  inhibition of electron transport activity. The Ca 2+  supported prevention of Cu 2+  toxicity was specific to Ca 2+ . Further analysis indicated that both Cu 2+  and Ca 2+  act competitively. Since Ca 2+  is known to have stimulating/stabilizing effect at the donor side of photosystem II, it is therefore suggested that Cu 2+  in NaCl washed particles exerts its inhibi­tory effect(s) at the oxidizing side of photosystem stimulates/stabilizes the oxygen evolution.

Copper Ion Inhibition of Electron Transport Activity in Sodium Chloride Washed Photosystem II Particle Is Partially Prevented by Calcium Ion