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- W3032151504 abstract "Expanding and reprogramming the genetic code of cells for the incorporation of multiple distinct non-canonical amino acids (ncAAs), and the encoded biosynthesis of non-canonical biopolymers, requires the discovery of multiple orthogonal aminoacyl–transfer RNA synthetase/tRNA pairs. These pairs must be orthogonal to both the host synthetases and tRNAs and to each other. Pyrrolysyl–tRNA synthetase (PylRS)/PyltRNA pairs are the most widely used system for genetic code expansion. Here, we reveal that the sequences of ΔNPylRS/ΔNPyltRNA pairs (which lack N-terminal domains) form two distinct classes. We show that the measured specificities of the ΔNPylRSs and ΔNPyltRNAs correlate with sequence-based clustering, and most ΔNPylRSs preferentially function with ΔNPyltRNAs from their class. We then identify 18 mutually orthogonal pairs from the 88 ΔNPylRS/ΔNPyltRNA combinations tested. Moreover, we generate a set of 12 triply orthogonal pairs, each composed of three new PylRS/PyltRNA pairs. Finally, we diverge the ncAA specificity and decoding properties of each pair, within a triply orthogonal set, and direct the incorporation of three distinct non-canonical amino acids into a single polypeptide. Non-canonical amino acids (ncAAs) can be incorporated into proteins in cells using orthogonal aminaocyl–tRNA synthetase/tRNA pairs; the most widely adopted system is based on a pyrrolysyl–tRNA synthetase (PylRS)/tRNA pair. Now, three new PylRS/tRNA pairs have been developed that are mutually orthogonal and can be used together to site-specifically incorporate three distinct ncAAs into a single protein." @default.
- W3032151504 created "2020-06-05" @default.
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- W3032151504 date "2020-05-29" @default.
- W3032151504 modified "2023-10-10" @default.
- W3032151504 title "Engineered triply orthogonal pyrrolysyl–tRNA synthetase/tRNA pairs enable the genetic encoding of three distinct non-canonical amino acids" @default.
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- W3032151504 doi "https://doi.org/10.1038/s41557-020-0472-x" @default.
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