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After cortisone injection, virtually identical increases in rat liver cytosol alanine-2-oxoglutarate aminotransferase and glutamate-glyoxylate aminotransferase activities were observed. The two activities were co-purified to homogeneity from rat liver cytosol. The purified enzyme was specific for L-alanine with 2-oxoglutarate as amino acceptor. With glyoxylate, however, the enzyme utilized various L-amino acids as amino donors in the following order of activity: glutamate greater than alanine greater than glutamine greater than methionine. The ratio of alanine-2-oxoglutarate aminotransferase activity to glutamate-glyoxylate aminotransferase activity remained constant during purification and was unchanged by a variety of treatments of the purified enzyme. These results suggest that glutamate-glyoxylate aminotransferase is identical with alanine-2-oxoglutarate aminotransferase. Evidence was obtained that the two enzyme activities in the cytosol of dog, cat and human liver are also properties of the same protein.

Glutamate-Glyoxylate Aminotransferase in Rat Liver Cytosol. Purification, Properties and Identity with Alanine-2-Oxoglutarate Aminotransferase