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Over 300 amino acids are found in proteins in nature, yet typically only 20 are genetically encoded. Reassigning stop codons and use of quadruplet codons emerged as the main avenues for genetically encoding non-canonical amino acids (NCAAs). Canonical aminoacyl-tRNAs with near-cognate anticodons also read these codons to some extent. This background suppression leads to ‘statistical protein’ that...
Genetically encoded phosphoserine incorporation programmed by the UAG codon was achieved by addition of engineered elongation factor and an archaeal aminoacyl-tRNA synthetase to the normal Escherichia coli translation machinery (Park et al., 2011) Science 333, 1151) [2]. However, protein yield suffers from expression of the orthogonal phosphoserine translation system and competition with release factor...
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