Ferulic acid decarboxylase (FDC) can biocatalyze ferulic acid to produce 4-vinylguaiacol, which was widely used in food, medicine, cosmetics and other industries.To study the enzymatic properties and catalytic function of ferulic acid decarboxylase from non-Saccharomyces yeasts, ferulic acid decarboxylase XM from Wickerhamomyces anomalus was screened from the National Center for Biotechnology Information (NCBI) database to achieve heterologous expression in Pichia pastoris.Molecular docking of ferulic acid decarboxylase XM with four acids (caffeic, ferulic, p-coumaric, and sinapic acids) predicted five amino acid residues (tyrosine, phenylalanine, histidine, glutamine, and glutamate) that might change the function of ferulic acid decarboxylase XM.The results showed that the enzyme activity of the recombinant protein were (19.72±0.32) IU/mg and (136.39±2.94) IU/mg in shake flasks and in fermenters after 84 h of induction, respectively.The recombinant enzyme showed maximum activity at 40 ℃ and pH 6.0.The enzyme had broad substrate specificity and was able to efficiently decarboxylate four acids at a substrate concentration of 4 mmol/L.The Km values of caffeic acid, ferulic acid, p-coumaric acid, and sinapic acid were (151.94±9.30), (133.70±5.62), (152.09±5.33), and (170.89±8.76) μmol/L, respectively, and the Vmax values were (156.23±2.19), (158.16±1.52), (156.86±1.14) and (128.64±0.96) IU/mg, respectively.This study laid a foundation for further exploring the catalytic mechanism of ferulic acid decarboxylase XM.
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