Abstract
In this study, five fusion tags affecting soluble production and cleavage activity of the tobacco etch virus (TEV) protease (TEVp) variant in Escherichia coli strains BL21 (DE3) and Rosetta™ (DE3) are investigated. Combination of the augmenting rare transfer RNAs (tRNAs) and the fused expressivity tag (N-terminal seven amino acid residues of E. coli translation initiation factor II) promotes the soluble TEVp partner expressed at relatively high level. Attachment of the maltose-binding protein (MBP) tag increases soluble expression of the protease released from the fusion protein in E. coli cells, but the incorporated TEVp recognition sequence slightly decreases expressivity of the fusion construct. Except for the green fluorescent protein, the attached expressivity tag shows less efficiency than the MBP tag in enhancing expression levels of the selected five target proteins in the Rosetta™ (DE3) cells under different induction conditions. Our results identified that high-level production of the functional target protein as the fusion partner in E. coli is combined with the intrinsic property of fusion tag, fusion protein stability, inherent folding of target protein, rare tRNA abundance, and the incorporated linker. Purified TEVp fusion constructs with the N-terminal expressivity tag, as well as the MBP partner, are the ideal alternatives for removing fusion tag.
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This work is supported by the Scientific and Technological Project of Anhui Province (1506c085007).
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Figure S1
SDS-PAGE analysis of the fusion protein cleaved by the TEVp constructs extracted from the recombinant E. coli BL21(DE3) cells (a) and Rosetta™ (DE3) cells (b). M: protein marker. CK: the protein substrate is incubated with the inactive TEVpC151A variant. The fusion protein substrate and the cleaved products are indicated by arrows. (TIFF 2262 kb)
Figure S2
The pigmented E. coli cells overexpressing the fusions proteins for EcGTR. Recombinant cells carrying pET-28b plasmids are used as the control. (TIFF 4194 kb)
Figure S3
SDS-PAGE analysis of the purified Ex-TEVpH6 and MBP-TEVpH6 proteins by Ni-NTA agarose. M: Protein marker. (TIFF 1971 kb)
Table S1
Primers used in this study (DOC 33 kb)
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Yu, X., Sun, J., Wang, W. et al. Assessment of the Fusion Tags on Increasing Soluble Production of the Active TEV Protease Variant and Other Target Proteins in E. coli . Appl Biochem Biotechnol 182, 769–781 (2017). https://doi.org/10.1007/s12010-016-2360-9
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DOI: https://doi.org/10.1007/s12010-016-2360-9