Departamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica-CSIC, Campus UAM, Cantoblanco, 28049 Madrid, Spain.
Bioresour Technol. 2012 Jan;103(1):343-50. doi: 10.1016/j.biortech.2011.10.018. Epub 2011 Oct 17.
The use of dehydrogenases in asymmetric chemistry has exponentially grown in the last decades facilitated by the genome mining. Here, a new short-chain alcohol dehydrogenase from Thermus thermophilus HB27 has been expressed, purified, characterized and stabilized by immobilization on solid supports. The enzyme catalyzes both oxidative and reductive reactions at neutral pH with a broad range of substrates. Its highest activity was found towards the reduction of 2,2',2″-trifluoroacetophenone (85 U/mg at 65 °C and pH 7). Moreover, the enzyme was stabilized more than 200-fold by multipoint covalent immobilization on agarose matrixes via glyoxyl chemistry. Such heterogeneous catalyst coupled to an immobilized cofactor recycling partner performed the quantitative asymmetric reduction of 2,2',2″-trifluoroacetophenone and rac-2-phenylpropanal to (S)-(+)-α-(trifluoromethyl)benzyl alcohol and (R)-2-phenyl-1-propanol with enantiomeric excesses of 96% and 71%, respectively. To our knowledge this is the first alcohol dehydrogenase from a thermophilic source with anti-Prelog selectivity for aryl ketones and that preferentially produces R-profens.
在过去的几十年中,通过基因组挖掘,脱氢酶在不对称化学中的应用呈指数级增长。在这里,我们表达、纯化、表征并通过固定在固体载体上来稳定来自嗜热栖热菌 HB27 的新型短链醇脱氢酶。该酶在中性 pH 下以宽底物范围催化氧化和还原反应。其对 2,2',2″-三氟乙酰苯(在 65°C 和 pH 7 时 85 U/mg)的还原具有最高活性。此外,该酶通过糖基化化学通过多点共价固定在琼脂糖基质上稳定超过 200 倍。这种非均相催化剂与固定化辅因子回收伴侣结合,可定量不对称还原 2,2',2″-三氟乙酰苯和 rac-2-苯基丙醛,分别得到对映体过量为 96%和 71%的(S)-(+)-α-(三氟甲基)苄醇和(R)-2-苯基-1-丙醇。据我们所知,这是第一个具有芳基酮反普雷洛格选择性和优先生成 R-丙醇的嗜热源醇脱氢酶。