Document Detail


Chloride-depletion of photosynthetic water oxidase. No proton release during the second oxidation step, S2*==>S3*, and a transmembrane radical pair recombination from the third on.
MedLine Citation:
PMID:  8262251     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Chloride depletion blocks the normal four-step progress of photosynthetic water oxidation. We studied proton release in chloride-depleted thylakoids which were dark-adapted and excited by flashing light. Proton release was blocked from the second flash on, possibly leaving an uncompensated positive charge in the catalytic centre. The reduction of P+680 by Tyrz was still very rapid (<< 10 microseconds). From the third flash on, P+680 was reduced more slowly (70 microseconds/200 microseconds), and by an electrogenic back-reaction. The uncompensated positive charge may be the reason why the rapid reduction of P+680 by Tyrz is prevented and the transmembrane charge-pair recombination is facilitated.
Authors:
K Lübbers; W Drevenstedt; W Junge
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  FEBS letters     Volume:  336     ISSN:  0014-5793     ISO Abbreviation:  FEBS Lett.     Publication Date:  1993 Dec 
Date Detail:
Created Date:  1994-01-27     Completed Date:  1994-01-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0155157     Medline TA:  FEBS Lett     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  304-8     Citation Subset:  IM    
Affiliation:
Biophysik, Universitt Osnabrück, Germany.
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MeSH Terms
Descriptor/Qualifier:
Chlorides / chemistry*
Dark Adaptation
Electrochemistry
Free Radicals
Hydrogen-Ion Concentration
Intracellular Membranes / chemistry,  physiology
Oxidation-Reduction
Oxidoreductases / chemistry*
Photosynthesis*
Water / chemistry*
Chemical
Reg. No./Substance:
0/Chlorides; 0/Free Radicals; 7732-18-5/Water; EC 1.-/Oxidoreductases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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