Abstract
By means of a Sephadex-electrophoresis column, L-phenylalanine: pyruvate transaminase (PPT) was separated from L-phenylalanine: α-ketoglutarate transaminase (PKT) from rat liver. These enzymes differed in heat lability in vitro and in their inducibility by glucagon in vivo . PPT was heat-stable and was induced by chronic glucagon injection. On the other hand, PKT was heat-labile and was not induced by glucagon under the experimental conditions used. These studies provide evidence that distinct enzymes catalyze the transamination of phenylalanine with pyruvate or with α-ketoglutarate as the amino acceptor.
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