D-4-ol synthase as the first reported enzyme that produces the (+)-enantiomer. The enzymatic mechanisms were thoroughly investigated by incubation with isotopically labeled precursors to follow the stereochemical courses of single reaction steps in catalysis. The role of putative active site residues was tested by site directed mutagenesis of a highly conserved tryptophan in all three enzymes and additional
来自白蚁相关真菌Termmitomyces的三个萜烯合酶在功能上被表征为(+)-
间苯二酚合酶,(-)-γ-卡丹烯合酶和(+)-germacrene D-4-ol合酶以及胚芽烯D-4-ol合酶作为第一个报道的产生(+)-对映体的酶。通过与同位素标记的前体孵育来彻底研究酶促机制,以遵循催化中单个反应步骤的立体
化学过程。通过在所有三种酶中的高度保守的色
氨酸进行定点诱变以及通过同源性模型分析确定的(-)-γ-in二烯合酶中的其他残基,对假定的活性位点残基的作用进行了测试。