Purification and Characterization of a (R)-1-Phenyl-1,3-propanediol-producing Enzyme from Trichosporon fermentans AJ-5152 and Enzymatic (R)-1-Phenyl-1,3-propanediol Production

An (R)-1-phenyl-1,3-propanediol-producing enzyme was purified from Trichosporon fermentans AJ-5152. It was NADPH-dependent and converted 3-hydroxy-1-phenylpropane-1-one (HPPO) to (R)-1-phenyl-1,3-propanediol [(R)-PPD] with anti-Prelog's specificity. It showed maximum activity at pH 7.0 and 40 degrees C. Its K-m and V-max values toward HPPO were 20.1 mM and 3.4 mu mol min(-1) mg protein(-1) respectively. The relative molecular weight of the enzyme was estimated to be 68,000 on gel filtration and 32,000 on SDS-polyacrylamide gel electrophoresis. An (R)-PPD-producing reaction using the (R)-PPD-producing enzyme and an NADPH recycling system was carried out by successive feeding of HPPO. A total (R)-PPD yield of 8.9 g/l was produced in 16 h. The molar yield was 76%, and the optical purity of the (R)-PPD produced was over 99% e.e.