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The crystal structure of a Dcp-containing peptide
G De Simone1, A Lombardi, S Galdiero
1Centro Interuniversitario di Ricerca su Peptidi Bioattivi, di Biocristallografia, CNR, University of Napoli "Federico II," via Mezzocannone 4, I-80134 Napoli, Italy.
Biopolymers
|February 19, 2000
Summary
Newly synthesized alpha,alpha-dicyclopropylglycine (Dcp) residues stabilize folded peptide conformations. The crystal structure of a Dcp-containing dipeptide reveals an alpha-pleated sheet structure, suggesting Dcp as a tool for conformational stabilization.
Area of Science:
- Peptide Chemistry
- Structural Biology
- Organic Synthesis
Background:
- Conformational preferences of amino acids are crucial for peptide structure and function.
- alpha,alpha-disubstituted glycines are known to induce specific secondary structures in peptides.
- alpha,alpha-dicyclopropylglycine (Dcp) is a novel synthetic amino acid.
Purpose of the Study:
- To investigate the conformational properties of alpha,alpha-dicyclopropylglycine (Dcp).
- To determine the crystal structure of a dipeptide containing Dcp residues.
- To assess the potential of Dcp as a molecular tool for stabilizing peptide conformations.
Main Methods:
- Synthesis of a fully protected dipeptide containing two Dcp residues: Z-Dcp(1)-Dcp(2)-OCH(3).
- X-ray crystallography to determine the three-dimensional structure of the dipeptide.
Main Results:
- Both Dcp residues in the dipeptide adopted a folded conformation.
- The overall peptide structure adopted an alpha-pleated sheet conformation.
- This conformation is similar to those observed in peptides with alternating D-/L-residues and in Z-Aib-Aib-OCH(3).
Conclusions:
- Dcp residues intrinsically favor folded conformations.
- The alpha-pleated sheet structure induced by Dcp highlights its potential in peptide design.
- Dcp can serve as a valuable molecular tool for stabilizing specific peptide secondary structures.