Utilization of rare codon-rich markers for screening amino acid overproducers

Bo Zheng, Xiaoyan Ma, Ning Wang, Tingting Ding, Liwei Guo, Xiaorong Zhang, Yu Yang, Chun Li and Yi-Xin Huo ()
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Bo Zheng: Beijing Institute of Technology
Xiaoyan Ma: Beijing Institute of Technology
Ning Wang: Beijing Institute of Technology
Tingting Ding: Beijing Institute of Technology
Liwei Guo: Beijing Institute of Technology
Xiaorong Zhang: Chinese Academy of Sciences
Yu Yang: Beijing Institute of Technology
Chun Li: Beijing Institute of Technology
Yi-Xin Huo: Beijing Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract The translation of rare codons relies on their corresponding rare tRNAs, which could not be fully charged under amino acid starvation. Theoretically, disrupted or retarded translation caused by the lack of charged rare tRNAs can be partially restored by feeding or intracellular synthesis of the corresponding amino acids. Inspired by this assumption, we develop a screening or selection system for obtaining overproducers of a target amino acid by replacing its common codons with the corresponding synonymous rare alternative in the coding sequence of selected reporter proteins or antibiotic-resistant markers. Results show that integration of rare codons can inhibit gene translations in a frequency-dependent manner. As a proof-of-concept, Escherichia coli strains overproducing l-leucine, l-arginine or l-serine are successfully selected from random mutation libraries. The system is also applied to Corynebacterium glutamicum to screen out l-arginine overproducers. This strategy sheds new light on obtaining and understanding amino acid overproduction strains.

Date: 2018
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DOI: 10.1038/s41467-018-05830-0

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