Hyunwoo Jeon, Sharad Sarak, Sang-Hyuk Lee, Han-Seop Bea, Mahesh Patil, Geon-Hee Kim, Byung-Gee Kim, Jong In Won, and Hyungdon Yun
Hyunwoo Jeon†, Sharad Sarak†, Geon-Hee Kim, Han-Seop Bea,Mahesh Patil, Hyungdon Yun*
Department of Systems Biotechnology, Konkuk University, Seoul, Korea
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Sang-Hyuk Lee, Byung-Gee Kim
School of Chemical and Biological Engineering, Seoul National University, Seoul, Korea
Jong In Won
Department of Chemical Engineering, Hongik University, Seoul, Korea
†Hyunwoo Jeon and Sharad Sarak contributed equally.
Received: 29 July 2018 / Revised: 5 September 2018 / Accepted: 16 September 2018
© The Korean Society for Biotechnology and Bioengineering and Springer 2018
Optically pure amines, β-amino acids and γ-amino acids are the valuable precursors to produce biologically active compounds. The ω-TAs are the class of enzymes which are widely used to produce such compounds. In this work (S)-ω-transaminase from the thermophilic eubacterium Sphaerobacter thermophilus (St-TA) was fused with Elastin-like polypeptides (ELPs) through the cloning process and expressed in E. coli cells. The characterization of this fusion complex was performed with respect to thermostability and effect of DMSO. Where in case of St-TA-ELP-V60, major difference in the transition temperature (Tt) was observed, wherein a Tt of 38 and 70οC was observed at the increasing concentration of DMSO from 5 to 25% (v/v). Interestingly, these fusion proteins the activity was preserved even after the aggregation of fusion complex at Tt. The substrate specificity and product inhibition analysis showed that ω-TA-ELPs had comparable results as that of wild type ω-TA. Moreover, the fused ω-TA could be efficiently reused for up to 20 batches of transamination reaction. Furthermore, the applicability of the fusion protein for the production of a sitagliptin precursor (R)-3-amino-4-(2,4,5-triflurophenyl) butanoic acid (3-ATfBA) was evaluated, wherein 3-ATfBA was synthesized with good conversion (65%).
(S)-ω-transaminase, elastin-like polypeptides, chiral amines, bio-catalysis, thermostability.