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'Photosystem II Particles' in keywords Facet   Publication Year 1998  [X]
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1998[X]
1Author    Chandra Surendra, Subash Sabat3, Prasanna Padhyeb, MohantycRequires cookie*
 Title    Inhibitory Effects of Synthetic Lanthanum-Crown Ether at the Reducing Side of Photosystem II  
 Abstract    Inhibitory effects of lanthanum-crown [La-(Pic)3 (15-crown-6) 3H2OJ.was investigated on the 0 2 evolution activity of photsystem II particles. Lanthanum (La)-crown inhibited the electron flow at the reducing side of PS II complex. Short duration (1 -2 min) treatment of PS II membranes with trypsin partly developed resistance to La-crown inhibition. However, longer proteolytic treatment (>2 min) appeared to expose newer site(s) for La-crown inhibi­ tion. The inhibitory constant (K,) for La-crown was nearly 0.17 | j ,m . This inhibitory capacity is about 4 to 5 times less than the potent PS II inhibitor diuron which also binds at the acceptor side of PS II. The number of binding sites for La-crown was found to be 1 per 20 chlorophyll molecules. The Hill plot analysis showed the presence of three distinct straight lines suggesting that the compound acts at least at three sites. Furthermore, from the slope value (Hill coefficient) it is suggested that two of these sites provide minimum of two binding domains for the inhibitor. 
  Reference    Z. Naturforsch. 53c, 49 (1998); received June 16/September 29 1997 
  Published    1998 
  Keywords    Beta vulgaris, Electron Transport Inhibition, Lanthanum Crown, Photosystem II Particles 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0049.pdf 
 Identifier    ZNC-1998-53c-0049 
 Volume    53