Enhancing the Translational Capacity of E. coli by Resolving the Codon Bias

Lipinszki, Zoltán and Vernyik, Viktor and Faragó, Nóra and Tobias, Sari and Puskás, László and Blattner, Frederick R. and Pósfai, György and Győrfy, Zsuzsanna (2018) Enhancing the Translational Capacity of E. coli by Resolving the Codon Bias. ACS SYNTHETIC BIOLOGY, 7 (11). pp. 2656-2664. ISSN 2161-5063


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Escherichia coli is a well-established and popular host for heterologous expression of proteins. The preference in the choice of synonymous codons (codon bias), however, might differ for the host and the original source of the recombinant protein, constituting a potential bottleneck in production. Codon choice affects the efficiency of translation by a complex and poorly understood mechanism. The availability of certain tRNA species is one of the factors that may curtail the capacity of translation. Here we provide a tRNA-overexpressing strategy that allows the resolution of the codon bias, and boosts the translational capacity of the popular host BL21(DE3) when rare codons are encountered. In the BL21(DE3)-derived strain, called SixPack, copies of the genes corresponding to the six least abundant tRNA species have been assembled in a synthetic fragment and inserted into a rRNA operon. This arrangement, while not interfering with the growth properties of the new strain, allows dynamic control of the transcription of the extra tRNA genes, providing significantly elevated levels of the rare tRNAs in the exponential growth phase. Results from expression assays of a panel of recombinant proteins of diverse origin and codon composition showed that the performance of SixPack surpassed that of the parental BL21(DE3) or a related strain equipped with a rare tRNA-expressing plasmid.

Item Type: Article
Uncontrolled Keywords: E. coli; Genome editing; efficient translation; rare tRNA genes; recombinant protein production;
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia > QH3011 Biochemistry / biokémia
Depositing User: MTMT SWORD
Date Deposited: 31 Jan 2019 15:14
Last Modified: 28 Nov 2019 00:15

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