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1978 (1)
1974 (1)
1Author    Rüdiger Hampp, Hubert ZieglerRequires cookie*
 Title    Der Einfluß von Bleiionen auf Enzyme der Chlorophyllbiosynthese Influence of Lead-ions on Enzymes of the Chlorophyll Biosynthesis  
 Abstract    The influence of different concentrations of PbCl2 on the activity of several enzymes of the chlorophyll biosynthesis in isolated spinach chloroplasts was analyzed. The succinyl-CoA-synthetase was weakly inhibited; a concentration of 2 m M PbCl2 reduced the enzyme activity for 30% only. The concentration of <5-aminoevulinic acid (ALA) after incubation of the chloroplast homogenate with the substrates for the succinyl-CoA-synthetase + ALA-synthetase (c/. Fig. 9) was increased by lower concentrations of PbCl2 (0 — 50 /< m) and decreased by higher (Ü>50,um). This can be explained by a correspondent influence of PbCl2 on the activity of ALA-synthetase or (more probably) by a relative stronger inhibitory effect of PbCl2 on the ALA-metabolizing than on ALA-producing enzymes. <5-Aminoevulinic acid dehydratase is strongly inhibited at low concentrations of PbCL , as it is in animals. The same is true for porphobilinogenase. 
  Reference    (Z. Naturforsch. 29c, 552 [1974]; eingegangen am 2. Mai 1974) 
  Published    1974 
  Keywords    Lead Effects, Chlorophyll Biosynthesis, ALA-Dehydratase, Porphobilinogenase 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0552.pdf 
 Identifier    ZNC-1974-29c-0552 
 Volume    29 
2Author    Siegrid Schoch, Wolfram SchäferRequires cookie*
 Title    Tetrahydrogeranylgeraniol, a Precursor of Phytol in the Biosynthesis of Chlorophyll a — Localization of the Double Bonds  
 Abstract    Pheophytins esterified with phytol and tetrahydrogeranylgeraniol are isolated from etiolated oat seedlings after short (1 min) exposure to light and a subsequent dark period of 15 to 20 min. After saponification of the pheophytins, a mixture of the alcohols was isolated. The structure of tetra­ hydrogeranylgeraniol was established as 3,7,11,15-tetramethyl-zl2'14 hexadecadiene-l-ol (3a). The implications for chlorophyll biosynthesis are discussed. 
  Reference    Z. Naturforsch. 33c, 408—412 (1978); received March 23 1978 
  Published    1978 
  Keywords    Birthday Avena sativa, Gramineae, Oats, Chlorophyll Biosynthesis, Phytol 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0408.pdf 
 Identifier    ZNC-1978-33c-0408 
 Volume    33