Solution structure of a beta-peptide ligand for hDM2

J Am Chem Soc. 2005 Mar 30;127(12):4118-9. doi: 10.1021/ja042933r.

Abstract

We recently reported a beta-peptide foldamer, beta53-1, that folds into a 14-helix in aqueous solution, binds the oncoprotein hDM2 with submicromolar affinity, and potently inhibits the interaction of hDM2 with a peptide derived from the activation domain of p53 (p53AD). Here, we present the solution structure of beta53-1 in methanol. Details of the structure illustrate fundamental and novel elements of beta-peptide folding and recognition. These elements include the detailed arrangement of a complex, 14-helix-stabilizing salt bridge on one helical face, and a unique "wedge into cleft" packing interaction along a second. The structure also reveals how a subtle distortion in the beta53-1 14-helix geometry alters the presentation of its recognition epitope, rendering it particularly well suited for alpha-helix mimicry. The solution structure of beta53-1 demonstrates that well folded beta-peptide oligomers can effectively present an extended, highly variable surface that could be used as a general platform for targeting critical protein-protein interfaces.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Ligands
  • Models, Molecular
  • Nuclear Magnetic Resonance, Biomolecular
  • Nuclear Proteins / antagonists & inhibitors
  • Nuclear Proteins / chemistry*
  • Nuclear Proteins / metabolism
  • Peptides / chemistry*
  • Peptides / metabolism
  • Protein Structure, Secondary
  • Proto-Oncogene Proteins / antagonists & inhibitors
  • Proto-Oncogene Proteins / chemistry*
  • Proto-Oncogene Proteins / metabolism
  • Proto-Oncogene Proteins c-mdm2
  • Solutions

Substances

  • Ligands
  • Nuclear Proteins
  • Peptides
  • Proto-Oncogene Proteins
  • Solutions
  • Proto-Oncogene Proteins c-mdm2