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The influence of glucose, ammonium and magnesium availability on the production of protease and bacitracin by Bacillus licheniformis.

Bacillus licheniformis was cultivated in a range of defined media varying in both the nature of the growth-limiting component and the concentration of excess nutrients. The compositions of the media were such as to ensure that the final absorbance (A430) of the culture was the same in each case. Samples taken during the stationary phase were assayed for their content of extracellular serine protease and bacitracin. The nature of the growth-limiting nutrient had a profound effect on the amounts of these products formed while those components which were present in excess also exerted an influence in proportion to their concentration. Thus, for example, a four-fold increase in serine protease production occurred when ammonium replaced glucose as the growth-limiting nutrient. Serine protease and bacitracin production responded differently to these varying cultural conditions suggesting they are subject to separate control mechanisms. The results are discussed in relation to the need for rigorously controlled cultural conditions during physiological studies of this nature.