| | 1 | Author
| SurendraC. Handra Sabat | Requires cookie* | | | Title
| Copper Ion Inhibition of Electron Transport Activity in Sodium Chloride Washed Photosystem II Particle Is Partially Prevented by Calcium Ion  | | | | Abstract
| The inhibitory effects of copper ion (Cu2+) on the photosynthetic electron transport func tion 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 j im 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 [.im Cu2+. Oppositely in native membranes, 15 (.im C u2+ inhibited only 10-12% o f control activity. It was found that calcium ion (Ca2+) significantly reduced the Cu2+ inhibition o f electron transport activity. The Ca2+ supported prevention of Cu2+ toxicity was specific to Ca2+. Further analysis indicated that both Cu2+ and Ca2+ act competitively. Since Ca2+ is known to have stimulating/stabilizing effect at the donor side of photosystem II, it is therefore suggested that Cu2+ in NaCl washed particles exerts its inhibi tory effect(s) at the oxidizing side of photosystem stim ulates/stabilizes the oxygen evolution. | | | |
Reference
| Z. Naturforsch. 51c, 179—1 (1996); received September 26 1995 | | | |
Published
| 1996 | | | |
Keywords
| Calcium Ion Copper Inhibition, Electron Transport, Photosystem II Particles, Spinach (Beta vulgaris) | | | |
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| default:Reihe_C/51/ZNC-1996-51c-0179.pdf | | | | Identifier
| ZNC-1996-51c-0179 | | | | Volume
| 51 | |
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