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1991 (1)
1Author    Gudrun Wälzlein, ElfriedeK. PistoriusRequires cookie*
 Title    Inactivation of Photosynthetic 0 2 Evolution in the Cyanobacterium Anacystis nidulans PCC 6301: Influence of Nitrogen Metabolites and Divalent Cation Concentration  
 Abstract    A n investigation about the in vivo inactivation o f photosynthetic water oxidation has been carried out in the cyanobacterium Anacystis nidulans (Synechococcus PC C 6301). Photosystem II and photosystem I activity as well as the relative am ount of the D 1 and manganese stabiliz­ ing peptide o f photosystem II were determined after growing the cells in nutrient media with variations in the nitrogen source and the concentration of the major divalent cations (M g 2+ and C a :+). The results show a rapid inactivation of water oxidation in A. nidulans in response to nitrogen deficiency and in response to reduced M g:+ and C a2+ concentrations. The inactiva­ tion o f water oxidation observed under divalent cation deficiency could be greatly accelerated when L-amino acids instead o f am m onia or nitrate were used as nitrogen source. Under these conditions inactivation o f water oxidation correlated with a rapid loss o f D 1 and with a slower loss o f the manganese stabilizing peptide from photosystem II. A possible regulation o f the photosystem II activity in A. nidulans by nitrogen metabolites is suggested. 
  Reference    Z. Naturforsch. 46c, 1024—1032 (1991); received June 26/August 19 1991 
  Published    1991 
  Keywords    Cyanobacteria, Anacystis nidulans PCC6301, Synechococcus PCC6301, Photosystem II, Photosystem I, Nitrogen Metabolism 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-1024.pdf 
 Identifier    ZNC-1991-46c-1024 
 Volume    46