Zhu HQ, Tang XL, Zheng RC, Zheng YG. Purification and Biochemical Characterization of a Tyrosine Phenol-lyase from Morganella morganii.
Appl Biochem Biotechnol 2020;
192:71-84. [PMID:
32236865 DOI:
10.1007/s12010-020-03301-1]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 03/12/2020] [Indexed: 11/26/2022]
Abstract
Tyrosine phenol-lyase (TPL) is a valuable and cost-effective biocatalyst for the biosynthesis of L-tyrosine and its derivatives, which are valuable intermediates in the pharmaceutical industry. A TPL from Morganella morganii (Mm-TPL) was overexpressed in Escherichia coli and characterized. Mm-TPL was determined as a homotetramer with molecular weight of 52 kDa per subunit. Its optimal temperature and pH for β-elimination of L-tyrosine were 45 °C and pH 8.5, respectively. Mm-TPL manifested strict substrate specificity for the reverse reaction of β-elimination and ortho- and meta-substituted phenols with small steric size were preferred substrates. The enzyme showed excellent catalytic performance for synthesis of L-tyrosine, 3-fluoro-L-tyrosine, and L-DOPA with a yield of 98.1%, 95.1%, and 87.2%, respectively. Furthermore, the fed-batch bioprocess displayed space-time yields of 9.6 g L-1 h-1 for L-tyrosine and 4.2 g L-1 h-1 for 3-fluoro-L-tyrosine with a yield of 67.4 g L-1 and 29.5 g L-1, respectively. These results demonstrated the great potential of Mm-TPL for industrial application.
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