Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Novel Bacterial Surface Display System Based on the Escherichia coli Protein MipA

  • Han, Mee-Jung (Department of Biomolecular and Chemical Engineering, and Department of Nursing, Dongyang University)
  • Received : 2020.01.31
  • Accepted : 2020.04.19
  • Published : 2020.07.28
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Abstract

Bacterial surface display systems have been developed for various applications in biotechnology and industry. Particularly, the discovery and design of anchoring motifs is highly important for the successful display of a target protein or peptide on the surface of bacteria. In this study, an efficient display system on Escherichia coli was developed using novel anchoring motifs designed from the E. coli mipA gene. Using the C-terminal fusion system of an industrial enzyme, Pseudomonas fluorescens lipase, six possible fusion sites, V140, V176, K179, V226, V232, and K234, which were truncated from the C-terminal end of the mipA gene (MV140, MV176, MV179, MV226, MV232, and MV234) were examined. The whole-cell lipase activities showed that MV140 was the best among the six anchoring motifs. Furthermore, the lipase activity obtained using MV140 as the anchoring motif was approximately 20-fold higher than that of the previous anchoring motifs FadL and OprF but slightly higher than that of YiaTR232. Western blotting and confocal microscopy further confirmed the localization of the fusion lipase displayed on the E. coli surface using the truncated MV140. Additionally the MV140 motif could be used for successfully displaying another industrial enzyme, α-amylase from Bacillus subtilis. These results showed that the fusion proteins using the MV140 motif had notably high enzyme activities and did not exert any adverse effects on either cell growth or outer membrane integrity. Thus, this study shows that MipA can be used as a novel anchoring motif for more efficient bacterial surface display in the biotechnological and industrial fields.

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References

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