Abstract
We report a methodology for the ribosomal synthesis of backbone-cyclized peptides involving genetic code reprogramming to introduce one or more nonproteinogenic amino acids. Expression of linear peptides bearing a cysteine-proline dipeptide sequence followed by glycolic acid results in self-rearrangement to a C-terminal diketopiperadine-thioester, which non-enzymatically generates a cyclized peptide. We demonstrate the ribosomal synthesis of several naturally occurring backbone-cyclized peptides and a library based on a bicyclic scaffold, and we identify bioactive sequences by screening and deconvolution.
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Acknowledgements
This work was supported by grants from the Japan Society for the Promotion of Science (JSPS) Grants-in-Aid for Scientific Research (16101007) and a research and development project of the Japanese Industrial Science and Technology Program in the New Energy and Industrial Technology Development Organization (NEDO) to H.S. T.K. and A.O. are supported by JSPS Research Fellowships for young scientists (20-664 and 19-1722, respectively).
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T.K., A.O. and H.S. designed the project. T.K., A.O., M.O., H.A. and H.M. performed experiments. The manuscript was written by T.K., A.O. and H.S.
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Kawakami, T., Ohta, A., Ohuchi, M. et al. Diverse backbone-cyclized peptides via codon reprogramming. Nat Chem Biol 5, 888–890 (2009). https://doi.org/10.1038/nchembio.259
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DOI: https://doi.org/10.1038/nchembio.259
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