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1980 (1)
1Author    Heinz-W Alter, Scheid, Adelheid Ehmke, Thomas HartmRequires cookie*
 Title    Plant NAD-Dependent Glutamate Dehydrogenase. Purification, Molecular Properties and Metal Ion Activation of the Enzymes from Lemna minor and Pisum sativum  
 Abstract    Glutamate dehydrogenase (L-glutamate: N A D + oxidoreductase (deaminating) EC has been purified to homogeneity from Lemna minor and seeds o f Pisum sativum. As established by polyacrylamide gel electrophoresis the Pisum-enzyme constitutes a multiple pattern o f seven char­ ge isoenzymes whereas the Lemna enzyme shows one single protein band. Molecular weights of 230 000 were calculated for both enzymes by sedimentation equilibrium measurements (Pisum-enzyme]I and comparative gel filtration (Lemna-enzyme). Sodium dodecyl sulfate gel electropho­ resis and electron microscopic observations revealed that both enzymes are composed of four identical subunits (molecular weight 58 500) arranged in a tetraedric structure. The amino acid compositions of both enzymes are similar to those of various hexameric glutamate dehydrogen­ ases. The N-terminal amino acid of the Pisum-enzyme is alanine. Both enzymes require Ca2+ for maximal catalytic activity. For the Lemna-enzyme the K0.s values for Ca2+ are 22 /j.m (NADH-de-pendent reaction) and 4 piM (N A D +-dependent reaction), respectively. Ca2+ which to some extent can be replaced by Zn2+ does not affect the enzyme aggregation but seems to govern a reversible equilibrium between catalytically active and inactive enzyme forms. 
  Reference    Z. Naturforsch. 35c, 213—221 (1980); received November 21 1979 
  Published    1980 
  Keywords    Lemna minor, Pisum sativum, Glutamate Dehydrogenase, Purification, Molecular Properties, Me­ tal Ion Activation 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0213.pdf 
 Identifier    ZNC-1980-35c-0213 
 Volume    35