L-ornithine transaminase synthesis in Saccharomyces cerevisiae: Induction by allophanate, intermediate and inducer of the urea degradative pathway adds to arginine induction.

Yeast ornithine transaminase is known to be induced by arginine and ornithine, through the action of regulatory elements common to arginase induction. We show here that it is subject to a second induction circuit, that which is responsible for urea amidolyase and urea permease induction by allophanate and defined by the regulatory mutants durL (-) and durM (-)