Reduces aromatic alpha-keto amides, aliphatic and aromatic alpha-keto esters, but not beta-keto esters. Stable from pH 6 to 9.5. Thermostable up to 40 degrees Celsius. Monomer. Transiently induced shortly after the switch from aerobic to anaerobic growth (at protein level). The N-terminus is blocked. Present with 4030 molecules/cell in log phase SD medium. Belongs to the aldo/keto reductase family.