| | 1 | Author
| Chandra Surendra, Subash Sabat3, Prasanna Padhyeb, Mohantyc | Requires 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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| default:Reihe_C/53/ZNC-1998-53c-0049.pdf | | | | Identifier
| ZNC-1998-53c-0049 | | | | Volume
| 53 | |
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