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The microbiological metabolism of warfarin was examined as a model of metabolism in higher organisms, including humans, and to determine the chirality of microbial reductases for application in organic synthesis. Nineteen cultures were examined based on their reported abilities to reduce ketonic substrates, and several were shown to catalyze the desired reaction. Nocardia corallina (ATCC 19070) exhibited complete substrate and product stereoselectivity as it reduced S-warfarin to the corresponding S-alcohol. Arthrobacter species (ATCC 19140) exhibited marked substrate and complete product stereoselectivity since S-warfarin, and to a lesser extent R-warfarin, were reduced to the corresponding S-alcohols. These reductions parallel those reported to occur in mammalian species.

Microbial transformations of warfarin: stereoselective reduction by Nocardia corallina and Arthrobacter species