Abstract
Phosphopantetheine has been demonstrated to be an enzyme-bound cofactor in one of the three enzyme fractions (light, intermediate, and heavy) required for tyrocidine biosynthesis. The enzyme-bound pantothenate had to be liberated by heating with alkali and treating the product with alkaline phosphatase. One mole of cofactor was estimated to be present per mole of heavy enzyme. It was absent from the light and intermediate enzyme fractions.
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