Evolution of translation machinery in recoded bacteria enables multi-site incorporation of nonstandard amino acids

Miriam Amiram, Adrian D. Haimovich, Chenguang Fan, Yane Shih Wang, Hans Rudolf Aerni, Ioanna Ntai, Daniel W. Moonan, Natalie J. Ma, Alexis J. Rovner, Seok Hoon Hong, Neil L. Kelleher, Andrew L. Goodman, Michael C. Jewett, Dieter Söll, Jesse Rinehart, Farren J. Isaacs

Research output: Contribution to journalArticlepeer-review

170 Scopus citations

Abstract

Expansion of the genetic code with nonstandard amino acids (nsAAs) has enabled biosynthesis of proteins with diverse new chemistries. However, this technology has been largely restricted to proteins containing a single or few nsAA instances. Here we describe an in vivo evolution approach in a genomically recoded Escherichia coli strain for the selection of orthogonal translation systems capable of multi-site nsAA incorporation. We evolved chromosomal aminoacyl-tRNA synthetases (aaRSs) with up to 25-fold increased protein production for p-acetyl-L-phenylalanine and p-azido-L-phenylalanine (pAzF). We also evolved aaRSs with tunable specificities for 14 nsAAs, including an enzyme that efficiently charges pAzF while excluding 237 other nsAAs. These variants enabled production of elastin-like-polypeptides with 30 nsAA residues at high yields (â 1/450 mg/L) and high accuracy of incorporation (>95%). This approach to aaRS evolution should accelerate and expand our ability to produce functionalized proteins and sequence-defined polymers with diverse chemistries.

Original languageEnglish
Pages (from-to)1272-1279
Number of pages8
JournalNature Biotechnology
Volume33
Issue number12
DOIs
StatePublished - 1 Dec 2015
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology
  • Molecular Medicine
  • Biomedical Engineering

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