[Intracellular ATP content and nonactin biosynthesis].

The effect of potassium orthophosphate on growth of the mycelium, its ATP contents and biosynthesis of the macrotetrolide antibiotic nonactin by Str. chrysomallus var. macrotetrolidi was studied. Direct dependence of the ATP contents in the mycelium on the amount of the phosphate added to the medium and consumed by the developing actinomycete was shown. Changes in the intracellular content of ATP depended also on the mycelium age. It was characterized by two peaks. Hemin was detected in the actinomycete mycelium. Its levels were sufficiently high and depended on the mycelium age and cultivation conditions, in particular on the phosphate content in the medium. Higher levels of nonactin biosynthesis were characteristic of the mycelium with lower contents of ATP, proteins and hemin. Intensive production of the antibiotic proceeded at the background of decreasing levels of ATP in the mycelium.