Insight into the Substrate Specificity of <i>Lactobacillus paracasei</i> Aspartate Ammonia-Lyase
2023
Yi-Hao Huang | Weir-Chiang You | Yung-Ju Chen | Jhih-Ying Ciou | Lu-Sheng Hsieh
Aspartate ammonia-lyase (AAL) catalyzes the reversible conversion reactions of aspartate to fumaric acid and ammonia. In this work, <i>Lactobacillus paracasei LpAAL</i> gene was heterologously expressed in <i>Escherichia coli</i>. As well as a recombinant His-tagged LpAAL protein, a maltose-binding protein (MBP) fused LpAAL protein was used to enhance its protein solubility and expression level. Both recombinant proteins showed broad substrate specificity, catalyzing aspartic acid, fumaric acid, phenylalanine, and tyrosine to produce fumaric acid, aspartic acid, <i>trans</i>-cinnamic acid, and <i>p</i>-coumaric acid, respectively. The optimum reaction pH and temperature of LpAAL protein for four substrates were measured at 8.0 and 40 °C, respectively. The <i>K</i><sub>m</sub> values of LpAAL protein for aspartic acid, fumaric acid, phenylalanine, and tyrosine as substrates were 5.7, 8.5, 4.4, and 1.2 mM, respectively. The <i>k</i><sub>cat</sub> values of LpAAL protein for aspartic acid, fumaric acid, phenylalanine, and tyrosine as substrates were 6.7, 0.45, 4.96, and 0.02 s<sup>−1</sup>, respectively. Therefore, aspartic acid, fumaric acid, phenylalanine, and tyrosine are <i>bona fide</i> substrates for LpAAL enzyme.
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