Document Detail

Shortening of life-time of the pair [P680+Pheo-] contributes to general inhibitory effect of dinoseb on electron transfer in PS-II.
MedLine Citation:
PMID:  11355638     Owner:  NLM     Status:  MEDLINE    
It is shown that dinoseb, added to subchloroplast photosystem-II (PS-II) preparations from pea at a concentration higher than 5 microM, along with blocking the electron transfer on the acceptor side of PS-II, induces the following effects revealing its capability to have redox interaction with the components of PS-II reaction center (RC)-pheophytin (Pheo) and chlorophyll P680: (1) acceleration of the dark relaxation of absorbance (delta A) and chlorophyll fluorescence (delta F) changes related to photoreduction of Pheo as a result of the photoreaction [P680Pheo] [symbol: see text] [P680Pheo-] that leads to elimination of the delta A and delta F at a concentration of the inhibitor higher than 50 microM; (2) lowering of the maximum level of fluorescence (F) due to a decrease of delta F under the condition when the electron acceptor, QA, is reduced; (3) loss of the described effects of dinoseb and appearance of its capability to donate electron to RC of PS-II in the presence of dithionite which reduces dinoseb in the dark; (4) inhibition of delta A related to photooxidation of P680; (5) activation of delta A related to photooxidation P700 in photosystem-I (PS-I) preparations (a similar effect is observed upon the addition of 0.2 mM methylviologen). It is suggested that redox interaction with the pair [P680+Pheo-] leading to the shortening of its life-time contributes to the general effect of inhibition of electron transfer in PS-II by dinoseb.
K Vyacheslav; A Suleyman; Z Serguei
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Indian journal of biochemistry & biophysics     Volume:  37     ISSN:  0301-1208     ISO Abbreviation:  Indian J. Biochem. Biophys.     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2001-05-17     Completed Date:  2001-06-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0310774     Medline TA:  Indian J Biochem Biophys     Country:  India    
Other Details:
Languages:  eng     Pagination:  491-7     Citation Subset:  IM    
Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region, 142292, Russian Federation.
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MeSH Terms
2,4-Dinitrophenol / analogs & derivatives*,  pharmacology*
Electron Transport / drug effects
Herbicides / pharmacology*
Light-Harvesting Protein Complexes
Peas / metabolism
Photosynthetic Reaction Center Complex Proteins / metabolism*
Photosystem I Protein Complex
Photosystem II Protein Complex
Reg. No./Substance:
0/Herbicides; 0/Light-Harvesting Protein Complexes; 0/Photosynthetic Reaction Center Complex Proteins; 0/Photosystem I Protein Complex; 0/Photosystem II Protein Complex; 51-28-5/2,4-Dinitrophenol; 88-85-7/dinoseb

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