Abstract
Geobacillus spp. are moderate thermophiles that have great potential for use in diverse applications. For effective utilization of the species, genetic tools have been extensively studied; however, an overexpression vector remains to be developed. Here we constructed a plasmid vector that can shuttle between Escherichia coli and Geobacillus spp., and which contained a maltose-inducible promoter from Geobacillus kaustophilus HTA426. Although the vector (termed pGKE119) was originally designed for basal gene expression, it surprisingly directed robust protein production in G. kaustophilus. Protein production essentially occurred in an auto-inducible manner without maltose; however, some proteins were produced more efficiently in the presence of maltose. Although the productivity was affected by culture conditions, three proteins were successfully produced with abundance ratios of 12–27% (on a total protein basis) and yields of 77–170 mg (per L culture). pGKE119 directed substantial protein production even in Geobacillus subterraneus, Geobacillus thermoglucosidasius, and Geobacillus thermoleovorans. This suggests that pGKE119 can use a range of Geobacillus spp. as hosts and widely expand their genetic toolbox. Because Geobacillus spp. are highly proliferative bacteria that are distinct from organisms used as protein production hosts, pGKE119 may also provide a novel platform for hyperproduction of recombinant proteins.
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Abbreviations
- OD600 :
-
Optical density at 600 nm
- LB:
-
Luria–Bertani
- SDS-PAGE:
-
Sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- []:
-
A carrier state of the plasmid
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Acknowledgements
This work was funded by the following organizations: Japan Society for the Promotion of Science (Grant numbers: 25450105 and 17K06925), Nagase Science and Technology Foundation, and the Institute for Fermentation, Osaka, Japan.
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Kurashiki, R., Mizuno, T., Murata, K. et al. A plasmid vector that directs hyperproduction of recombinant proteins in the thermophiles Geobacillus species. Extremophiles 24, 147–156 (2020). https://doi.org/10.1007/s00792-019-01142-3
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DOI: https://doi.org/10.1007/s00792-019-01142-3