|Tamaki, N.; Fujimoto, S.; Mizota, C.; Kikugawa, M.
|Identity of beta-alanine-oxo-glutarate aminotransferase and L-beta- aminoisobutyrate aminotransferase in rat liver
|Biochim Biophys Acta
|L-beta-Aminoisobutyrate served as an amino donor for purified beta- alanine-oxo-glutarate aminotransferase from rat liver when 2- oxoglutarate was employed as an amino acceptor, but the D-isomer did not. L-beta-Aminoisobutyrate acted as a competitive inhibitor with respect to beta-alanine and had a Ki of approximately 2.6 mM, which is the same value as the Km of 2.7 mM. When the crude extract was applied to a DEAE-Sepharose CL-6B column, L-beta-aminoisobutyrate aminotransferase and beta-alanine-oxo-glutarate aminotransferase activities were found in the same fractions with a single peak. Antiserum to rat liver beta-alanine-oxo-glutarate aminotransferase inhibited L-beta-aminoisobutyrate aminotransferase activity in rat liver in the same way as beta-alanine-oxo-glutarate aminotransferase activity.