Purification and Characterization of a (<i>R</i>)-1-Phenyl-1,3-propanediol-producing Enzyme from<i>Trichosporon fermentans</i>AJ-5152 and Enzymatic (<i>R</i>)-1-Phenyl-1,3-propanediol Production
作者:Ikuo KIRA、Norimasa ONISHI
DOI:10.1271/bbb.90159
日期:2009.7.23
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 °C. Its K m and V max values toward HPPO were 20.1 mm and 3.4 μmol 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.
从 Trichosporon fermentans AJ-5152 中纯化出一种 (R)-1-phenyl-1,3-propanediol 产酶。它依赖于 NADPH,能将 3-羟基-1-苯基-1-丙酮(HPPO)转化为(R)-1-苯基-1,3-丙二醇[(R)-PPD],具有抗 Prelog 的特异性。它在 pH 值为 7.0 和温度为 40 °C 时显示出最大活性。它对 HPPO 的 K m 和 V max 值分别为 20.1 mm 和 3.4 μmol min-1 mg protein-1。在凝胶过滤和 SDS 聚丙烯酰胺凝胶电泳中,酶的相对分子量分别估计为 68,000 和 32,000。通过连续加入 HPPO,利用(R)-PPD 生成酶和 NADPH 循环系统进行了(R)-PPD 生成反应。摩尔产率为 76%,生产的(R)-PPD 的光学纯度超过 99%。