Abstract
Cell-surface display using anchor motifs of outer membrane proteins allows exposure of target peptides and proteins on the surface of microbial cells. Previously, we obtained and characterized highly catalytically active recombinant oligo-α-1,6-glycosidase from the psychrotrophic bacterium Exiguobacterium sibiricum (EsOgl). It was also shown that the autotransporter AT877 from Psychrobacter cryohalolentis and its deletion variants efficiently displayed type III fibronectin (10Fn3) domain 10 on the surface of Escherichia coli cells. The aim of the work was to obtain an AT877-based system for displaying EsOgl on the surface of bacterial cells. The genes for the hybrid autotransporter EsOgl877 and its deletion mutants EsOgl877Δ239 and EsOgl877Δ310 were constructed, and the enzymatic activity of EsOgl877 was investigated. Cells expressing this protein retained ~90% of the enzyme maximum activity within a temperature range of 15-35°C. The activity of cells expressing EsOgl877Δ239 and EsOgl877Δ310 was 2.7 and 2.4 times higher, respectively, than of the cells expressing the full-size AT. Treatment of cells expressing EsOgl877 deletion variants with proteinase K showed that the passenger domain localized to the cell surface. These results can be used for further optimization of display systems expressing oligo-α-1,6-glycosidase and other heterologous proteins on the surface of E. coli cells.
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Abbreviations
- AT:
-
autotransporter
- EsOgl:
-
oligo-α-1,6-glycosidase from Exiguobacterium sibiricum
- 10Fn3:
-
human fibronectin type III domain 10
- PBS:
-
phosphate buffered saline
- pNPG:
-
p-nitrophenyl-α-D-glucopyranoside
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The work was performed as part of the State Assignment for the Institute of Bioorganic Chemistry of the Russian Academy of Sciences no. FMFM-2019-0007 (0101-2019-0007).
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L.N.S., L.E.P., and M.P.K. developed the concept and supervised the study; L.N.S., E.A.K., and S.Sh.G.: performed the experiments; L.N.S., L.E.P., and D.A.D. discussed the results; L.E.P. and L.N.S. wrote the manuscript.
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The authors declare no conflict of interest in financial or any other sphere. This article does not contain a description of studies with human participants or animals performed by any of the authors.
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Shingarova, L.N., Petrovskaya, L.E., Kryukova, E.A. et al. Display of Oligo-α-1,6-Glycosidase from Exiguobacterium sibiricum on the Surface of Escherichia coli Cells. Biochemistry Moscow 88, 716–722 (2023). https://doi.org/10.1134/S0006297923050140
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DOI: https://doi.org/10.1134/S0006297923050140