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The synthesis and nature of the toxin of Clostridium botulinum type B were studied in growing cells. It was demonstrated that the toxin was synthesized in the latter stage of logarithmic growth and was released into the culture supernatant fluid during lysis of the cells. Studies were done on the sedimentation properties of intracellular toxin. Two components were demonstrated, one of low molecular weight and low specific activity and one of high molecular weight with specific activity similar to that isolated from culture lysates. The high molecular weight toxin was shown to be composed of an aggregate of small subunits, separable with either high ionic strength or sodium dodecyl sulfate.

Intracellular Synthesis of Clostridium botulinum Type B Toxin I. Demonstration of Toxin Synthesis and Sedimentation Studies on Toxic Products