Substrate Diversity of Macrophomate Synthase Catalyzing an Unusual Multistep Transformation from 2-Pyrones to Benzoates
作者:Kenji WATANABE、Takashi MIE、Akitami ICHIHARA、Hideaki OIKAWA、Mamoru HONMA
DOI:10.1271/bbb.64.530
日期:2000.1
Macrophomate synthase, which we have recently purified, catalyzes an unusual multistep transformation from 5-acetyl-4-methoxy-6-methyl-2-pyrone to 4-acetyl-3-methoxy-5-methyl-benzoic acid (macrophomic acid). To investigate the substrate diversity of the enzyme, 40 analogs of 2-pyrone were prepared and their relative efficiency was examined in the enzymatic conversions. The experimental results reveal the structural requirements of the substrates and the rough size of the enzyme active site, and eliminate the ambiguity caused by contamination by other enzymes in the whole-cell experiments.
我们最近纯化了一种名为黑腐醇合酶的酶,它催化一种不寻常的多步转化过程,从5-乙酰基-4-甲氧基-6-甲基-2-吡営转变为4-乙酰基-3-甲氧基-5-甲基苯甲酸(黑腐酸)。为了研究该酶的底物多样性,我们制备了40种2-吡喃酮的类似物,并考察了它们在酶促转化中的相对效率。实验结果揭示了底物的结构要求和酶活性位点的大致尺寸,并消除了全细胞实验中因其他酶污染导致的模糊性。