Funding Organization(s): American Association of Colleges of Pharmacy, University of Illinois Cancer Center, Chicago Biomedical Consortium, National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH), National Science Foundation (NSF, United States)
"Stapled" peptides are typically designed to replace two non-interacting residues with a constraining, olefinic staple. To mimic interacting leucine and isoleucine residues, we have created new amino acids that incorporate a methyl group in the γ-position of the stapling amino acid S5 ...
"Stapled" peptides are typically designed to replace two non-interacting residues with a constraining, olefinic staple. To mimic interacting leucine and isoleucine residues, we have created new amino acids that incorporate a methyl group in the γ-position of the stapling amino acid S5. We have incorporated them into a sequence derived from steroid receptor coactivator 2, which interacts with estrogen receptor α. The best peptide (IC50 =89 nm) replaces isoleucine 689 with an S-γ-methyl stapled amino acid, and has significantly higher affinity than unsubstituted peptides (390 and 760 nm). Through X-ray crystallography and molecular dynamics studies, we show that the conformation taken up by the S-γ-methyl peptide minimizes the syn-pentane interactions between the α- and γ-methyl groups.
Organizational Affiliation:
Department of Medicinal Chemistry and Pharmacognosy and UI Cancer Center, University of Illinois at Chicago, 833 S. Wood St., Chicago, IL, 60612, USA. twmoore@uic.edu.
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