Protein Production in Chemically Defined Medium by Bacillus brevis No. 47

Abstract

A simple chemically defined medium was devised for exoprotein production by Bacillus brevis No. 47. About 2mg/ml of proteins was produced in the synthetic medium containing 4% glucose and 1% ammonium sulfate. An essential component of fermentation medium was Ca salt which is required by this organism for assimilating glucose.
Studies on the effects of various medium components on protein production revealed that the conditions appropriate for growth are also suitable for protein accumulation. Some compounds, especially inhibitors of cell wall synthesis and certain detergents, were found to enhance protein production.