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'Calcium Ion Copper Inhibition' in keywords
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1996 (1)
1Author    SurendraC. Handra SabatRequires 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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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0179.pdf 
 Identifier    ZNC-1996-51c-0179 
 Volume    51