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A designed beta-hairpin peptide in crystals

I L Karle1, S K Awasthi, P Balaram

  • 1Laboratory for the Structure of Matter, Naval Research Laboratory, Washington, DC 20375-5341, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 6, 1996
PubMed
Summary

This study details the crystal structure of a designed beta-hairpin, a significant step for de novo peptide and protein design. The findings advance the development of complex beta-sheet structures.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Peptide Chemistry

Background:

  • Beta-hairpin structures are less understood and characterized than helices in acyclic peptides.
  • Crystallographic data for beta-hairpins in peptides is limited, especially for longer sequences.

Purpose of the Study:

  • To describe the crystal structure of a designed octapeptide beta-hairpin.
  • To investigate the conformational properties of beta-hairpins in the solid state.
  • To provide insights for de novo protein and peptide design.

Main Methods:

  • X-ray crystallography was used to determine the three-dimensional structure.
  • The designed octapeptide sequence was synthesized and crystallized.
  • Structural analysis focused on the overall fold and the conformation of the central turn motif.

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Main Results:

  • The crystal structure of the designed octapeptide t-butoxycarbonyl-Leu-Val-Val-D-Pro-Gly-Leu-Val-Val-OMe was determined.
  • Two independent molecules in the crystal lattice adopted nearly ideal beta-hairpin conformations.
  • The central D-Pro-Gly segment was found to adopt a Type II' beta-turn, stabilizing the hairpin.

Conclusions:

  • The definitive characterization of this beta-hairpin provides a structural basis for understanding these motifs.
  • This work has significant implications for the rational design of peptides and proteins.
  • It particularly aids in the development of novel three- and four-stranded beta-sheet architectures.