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Eur J Biochem. 1978 Jun 15;87(2):391-400.

The purification and properties of the aspartate aminotransferase and aromatic-amino-acid aminotransferase from Escherichia coli.

Abstract

A simple and convenient procedure is described for the isolation in good yield of two amino-transferases from various strains of Escherichia coli. On the basis of their substrate specificities one of the enzymes has been classified as an aromatic amino acid aminotransferase and the other as an aspartate aminotransferase, but both act on a wide range of substrates. Pyridoxal phosphate is bound more strongly to the aspartate aminotransferase than to the aromatic amino transferase which cannot be fully re-activated after removal of the prosthetic group. Both enzymes are composed of two subunits which appear to be identical.

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