The metabolism of γ-hydroxyglutamate in rat liver II. A transaminase concerned in γ-hydroxyglutamate metabolism
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説明
1. 1. An enzyme which catalyses the transamination between γ-hydroxyglutamate and α-ketoglutarate was extracted from rat-liver acetone powder and purified in excess of 15-fold. Fractionation of the enzyme from a separate aspartate transaminase (L-aspartate: 2-oxoglutarate aminotransferase, EC 2.6.1.1) remained incomplete. 2. 2. [2-14C]Pyruvate was incorporated into γ-hydroxy-α-ketoglutarate and γ-hydroxyglutamate in the presence of glyoxylate in rat-liver homogenate. Specific activity values of these three compounds indicated the occurence of the following pathway: Pyruvate + glyoxylate ⇌ γ-hydroxy-α-ketoglutarate ⇌ γ-hydroxyglutamate. 3. 3. A further possible pathway of γ-hydroxy-α-ketoglutarate metabolism leading to malate and of γ-hydroxyglutamate to its decarboxylation product or to L-hydroxyproline were inferred and discussed.
収録刊行物
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- Biochimica et Biophysica Acta
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Biochimica et Biophysica Acta 78 629-636, 1963-12-01
Elsevier BV
