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The aspartokinase activity found in extracts of the bacteriumMyxococcus xanthus was subject to feedback inhibition and feedback repression byl -threonine andl -lysine. Both types of inhibition were essentially additive. The required amino acids,l -isoleucine andl -methionine, caused considerable increase in the activity of the enzyme. This phenomenon is referred to as “feedback stimulation.” The polyamine, spermidine, exerted strong enhancement of the activity even at 0.1 mM. Meso-diaminopimelate, although not inhibitory by itself, abolished the activation exerted by eitherl -isoleucine orl -methionine. The possible physiological significance of interactions between the various effectors is discussed.

Aspartokinase of Myxococcus xanthus : “Feedback Stimulation” by Required Amino Acids