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'Photosynthetic Hydrogen Peroxide Production' in keywords Facet   section ZfN Section C  [X]
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1997 (1)
1Author    Gottfried Martin, Peter BögerRequires cookie*
 Title    Two Ways of Hydrogen Peroxide Formation in the Oxidative Inactivation of Cyanobacterial Glutamine Synthetase  
 Abstract    Using crude extracts from the cyanobacterium Anabaena variabilis glutamine synthetase (GS) activity was rapidly irreversibly reduced to about 60% during dark incubation ("sponta­ neous GS inactivation"). An additional decrease was observed by the addition of ammonia in the light ("ammonia-m ediated inactivation"). Both effects were prevented by EDTA, MnCl2 or catalase indicative of the involvement of H 20 2. This is a key interm ediate in oxida­ tive enzyme inactivation. In both spontaneous and am monia-mediated GS inactivation H 20 2 is produced in different ways. Spontaneous inactivation is prevented by depletion of reduced pyridine nucleotides which apparently donate electrons to produce H 20 2. Fractionation of the crude extract showed that the light-enhanced GS inactivation by ammonia required the presence of thylakoid membranes. The photosynthesis inhibitor DCM U decreased GS inacti­ vation by ammonia. For the inactivation in the light apparently H 20 2 is produced from super­ oxide during photosynthetic electron transport. 
  Reference    Z. Naturforsch. 52c, 812—816 (1997); received August 12 1997 
  Published    1997 
  Keywords    Glutamine Synthetase, Protein Oxidation Ammonia Effect, Photosynthetic Hydrogen Peroxide Production, Cyanobacterium, Anabaena variabilis 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0812.pdf 
 Identifier    ZNC-1997-52c-0812 
 Volume    52