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21Author    Hans-Ulrich Meisch, Heinz Hoffmann, Wolfgang ReinleRequires cookie*
 Title    Vanadium Catalysis in the Nonenzymatic Transamination of 8-Aminolevulinic Acid  
 Abstract    By nonenzymatic model reactions, the influence o f vanadium (V 0 2+, V 0 3~) and other metal ions (A l3+, F e2+, F e3+, Zn2+, N i2+, Cr3+) on the transamination of 4,5-dioxovaleric acid (D O V A) with L-alanine (A la) to 6 -aminolevulinic acid (<5-ALA) and pyruvic acid (P A) with pyridoxal phosphate (P L P) is investigated. The examinations o f the partial reactions show that V 0 2+, V 0 3~ and F e2+ effectively enhance both conversions, while N i2+ only promotes the conversion of D O V A to 6 -A L A with pyridoxamine phosphate (P M P) . Besides Cr3+ , which inhibits the transaminations, all other metals tried slightly enhance both reactions. The coupled transamination D O VA/A la to (5-ALA/PA with P L P as a catalyst is performed at 40 °C , the extent of the reaction being judged by the amount o f 6 -A L A formed. Am ong all metal ions tested, V 0 2+ and V 0 3~ were found to be the most effective ones. Fe2+, A l 3+ and Fe3+ also slightly enhance the reaction, but all other metals do not influence or inhibit the transamination. In presence of V 0 2+ or V O 3-ions, the optimum pH of the reaction shifts from pH 4 to pH 7.4. The positive influence of vanadium on <5-ALA trans­ amination is discussed in connection with known structures of analogous Schiff base complexes with metal ions. 
  Reference    Z. Naturforsch. 33c, 623 (1978); received March 21 1978 
  Published    1978 
  Keywords    Vanadium, (5-Aminolevulinic Acid, 45-Dioxovaleric Acid, Transamination, Pyridoxal Phosphate, Schiff Base Complexes 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0623.pdf 
 Identifier    ZNC-1978-33c-0623 
 Volume    33