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Applied Microbiology and Biotechnology

, Volume 104, Issue 3, pp 1109–1123 | Cite as

Genome mining integrating semi-rational protein engineering and nanoreactor design: roadmap for a robust biocatalyst for industrial resolution of Vince lactam

  • Hongxia Li
  • Shuaihua Gao
  • Yan Qiu
  • Chaoqun Liang
  • Shaozhou ZhuEmail author
  • Guojun ZhengEmail author
Biotechnologically relevant enzymes and proteins
  • 140 Downloads

Abstract

Biomanufacturing of chemicals using biocatalysts is an attractive strategy for the production of valuable pharmaceuticals since it is usually more economical and has a much-reduced environmental impact. However, there are often challenges such as their thermal instability that should be overcome before a newly discovered enzyme is eventually translated into industrial processes. In this work, we describe a roadmap for the development of a robust catalyst for industrial resolution of Vince lactam, a key intermediate for the synthesis of carbocyclic-nucleoside-related pharmaceuticals. By a genome mining strategy, a new (+)-γ-lactamase (MiteL) from Microbacterium testaceum was successfully discovered and biochemically characterized. In vitro studies showed that the enzyme exhibited high activity but poor enantioselectivity (E = 6.3 ± 0.2) toward racemic Vince lactam, and thus, it is not suitable for industrial applications. Based on structural modeling and docking studies, a semi-rational engineering strategy combined with an efficient screening method was then applied to improve the enantioselectivity of MiteL. Several mutants with significant shifting stereoselectivity toward (−)-γ-lactam were obtained by site-saturation mutagenesis. Synergy effects led to the final mutant F14D/Q114R/M117L, which enabled efficient acquisition of (−)-γ-lactam with a high E value (> 200). The mutant was biochemically characterized, and the docking studies suggested a plausible mechanism for its improved selectivity. Finally, a sunflower-like nanoreactor was successfully constructed to improve the mutant’s robustness via protein supramolecular self-assembly. Thus, the synergism between semi-rational protein engineering and self-assembling immobilization enabled construction of a nanoreactor with superior properties, which can be used for resolution of Vince lactam in large scale.

Keywords

Biocatalysis Carbocyclic nucleoside Vince lactam Semi-rational engineering Direct evolution Protein nanoreactor Self-assembling 

Notes

Acknowledgments

This work was supported by the National Mega-project for Innovative DrugsGreat Science and Technology Projects (20198ZX09721001-007-002), Fundamental Research Funds for the Central Universities (No. XK1802-8 and XK1803-06), and National Natural Science Foundation of China (NSFC, Grant No. 21706005).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical statement

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

253_2019_10275_MOESM1_ESM.pdf (1.1 mb)
ESM 1 (PDF 1104 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Chemical Resources EngineeringBeijing University of Chemical TechnologyBeijingPeople’s Republic of China
  2. 2.College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijingPeople’s Republic of China

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