Yeasts were screened for strains that converted ethyl 2-acetamido-3-oxobutyrate (AAOB) to optically active ethyl 2-acetamido-3-hydroxybutyrate (AAHB). Sporobolomyces sp. AKU4430 was found to accumulate the D-threo isomer of AAHB by a whole-cell reaction. Candida albicans AKU4596 accumulated...