Enzymatic Synthesis of L-threo-β-Hydroxy-α-Amino Acids via Asymmetric Hydroxylation Using 2-Oxoglutarate-Dependent Hydroxylase from Sulfobacillus thermotolerans Strain Y0017

Ryotaro Hara, Yuta Nakajima, Hiroaki Yanagawa, Ryo Gawasawa, Izumi Hirasawa, Kuniki Kino*

*この研究の対応する著者

研究成果: Article査読

抄録

β-Hydroxy-α-amino acids are useful compounds for pharmaceutical development. Enzymatic synthesis of β-hydroxy-α-amino acids has attracted considerable interest as a selective, sustainable, and environmentally benign process. In this study, we identified a novel amino acid hydroxylase, AEP14369, from Sulfobacillus thermotolerans Y0017, which is included in a previously constructed CAS-like superfamily protein library, to widen the variety of amino acid hydroxylases. The detailed structures determined by nuclear magnetic resonance and X-ray crystallography analysis of the enzymatically produced compounds revealed that AEP14369 catalyzed threo- β-selective hydroxylation of L-His and L-Gln in a 2-oxoglutarate-depend-ent manner. Furthermore, the production of L-threo-β-hydroxy-His and L-threo-β-hydroxy-Gln was achieved using Escherichia coli expressing the gene encoding AEP14369 as a whole-cell biocatalyst. Under optimized reaction conditions, 137 mM (23.4 g liter21) L-threo- β-hydroxy-His and 150 mM L-threo- β-hydroxy-Gln (24.3 g lit-er21) were obtained, indicating that the enzyme is applicable for preparative-scale production. AEP14369, an L-His/L-Gln threo- β-hydroxylase, increases the availability of 2-oxoglutarate-dependent hydroxylase and opens the way for the practical production of β-hydroxy-α-amino acids in the future. The amino acids produced in this study would also contribute to the structural diversification of pharmaceuticals that affect important bioactivities. IMPORTANCE Owing to an increasing concern for sustainability, enzymatic approaches for producing industrially useful compounds have attracted considerable attention as a powerful complement to chemical synthesis for environment-friendly synthesis. In this study, we developed a bioproduction method for β-hydroxy-α-amino acid synthesis using a newly discovered enzyme. AEP14369 from the moderate thermophilic bacterium Sulfobacillus thermotolerans Y0017 catalyzed the hydroxylation of L-His and L-Gln in a regioselective and stereoselective fashion. Furthermore, we biotechnologically synthesized both L-threo-β-hydroxy-His and L-threo-β-hydroxy-Gln with a titer of over 20 g liter21 through whole-cell bioconversion using recombinant Escherichia coli cells. As β-hydroxy-α-amino acids are important compounds for pharmaceutical development, this achievement would facilitate future sustainable and economical industrial applications.

本文言語English
ページ(範囲)1-10
ページ数10
ジャーナルApplied and Environmental Microbiology
87
20
DOI
出版ステータスPublished - 2021 9
外部発表はい

ASJC Scopus subject areas

  • バイオテクノロジー
  • 食品科学
  • 生態学
  • 応用微生物学とバイオテクノロジー

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