Makura Y, Ueda A, Kato T, Iyoshi A, Higuchi M, Doi M, Tanaka M. X-ray Crystallographic Structure of α-Helical Peptide Stabilized by Hydrocarbon Stapling at
i,
i + 1 Positions.
Int J Mol Sci 2021;
22:ijms22105364. [PMID:
34069753 PMCID:
PMC8160927 DOI:
10.3390/ijms22105364]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/14/2021] [Accepted: 05/17/2021] [Indexed: 11/16/2022] Open
Abstract
Hydrocarbon stapling is a useful tool for stabilizing the secondary structure of peptides. Among several methods, hydrocarbon stapling at i,i + 1 positions was not extensively studied, and their secondary structures are not clarified. In this study, we investigate i,i + 1 hydrocarbon stapling between cis-4-allyloxy-l-proline and various olefin-tethered amino acids. Depending on the ring size of the stapled side chains and structure of the olefin-tethered amino acids, E- or Z-selectivities were observed during the ring-closing metathesis reaction (E/Z was up to 8.5:1 for 17–14-membered rings and up to 1:20 for 13-membered rings). We performed X-ray crystallographic analysis of hydrocarbon stapled peptide at i,i + 1 positions. The X-ray crystallographic structure suggested that the i,i + 1 staple stabilizes the peptide secondary structure to the right-handed α-helix. These findings are especially important for short oligopeptides because the employed stapling method uses two minimal amino acid residues adjacent to each other.
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