Abstract
The tRNA population reflects the codon bias of the organism and affects the translation of heterologous target mRNA molecules. In this study, Saccharomyces cerevisiae strains with modified levels of rare tRNA were engineered, that allowed efficient generation of recombinant proteins with unfavorable codon usage. We established a novel synthetic tRNA expression cassette and verified functional nonsense suppressor tRNAGlnS CUA generation in a stop codon read-through assay with a modified β-galactosidase reporter gene. Correlation between altered tRNA and protein level was shown by survival of copper sensitive S. cerevisiae cells in the presence of copper ions by an increased transcription of tRNAArg CCG molecules, recognizing rare codons in a modified CUP1 gene. Genome integration of tRNA expression cassette led to the generation of arginine-tRNA-adapted S. cerevisiae strains, which showed elevated tRNA levels (tRNAArg CCG, tRNAArg GCG and tRNAArg UCG) pairing to rare codons. The modified strain MNY3 revealed a considerably improved monitoring of protein–protein interaction from Aspergillus fumigatus bait and prey sequences in yeast two-hybrid experiments. In future, this principle to overcome limited recombinant protein expression by tRNA adaption of expression strains instead of codon adaption might provide new designer yeast cells for an efficient protein production and for improved genome-wide protein–protein interaction analyses.
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Acknowledgements
The authors would like to thank Ella Schuster for assistance during her master thesis. This study was supported by the Ernst-Abbe University of Applied Sciences Jena, by the Leibniz Institute for Natural Product Research and Infection Biology—Hans Knöll Institute Jena and the collaborative research center/transregio 124 FungiNet (project A1) funded by the Deutsche Forschungsgemeinschaft. We thank Dr. Pollok for critical reading of the manuscript.
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Communicated by M. Kupiec.
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Noßmann, M., Pieper, J., Hillmann, F. et al. Generation of an arginine-tRNA-adapted Saccharomyces cerevisiae strain for effective heterologous protein expression. Curr Genet 64, 589–598 (2018). https://doi.org/10.1007/s00294-017-0774-8
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DOI: https://doi.org/10.1007/s00294-017-0774-8