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Three protected tetrapeptides

E Fenude1, G Casalone

  • 1Istituto per l'Applicazione delle Tecniche Chimiche Avanzate ai Problemi Agrobiologici, CNR, Sassari, Italy.

Acta Crystallographica. Section C, Crystal Structure Communications
|April 15, 1996
PubMed
Summary

Three protected tetrapeptides (Boc-Gly-Gly-Phe-X-OMe) share a common conformation and crystal packing. Molecules form head-to-tail dimers via hydrogen bonds, creating planar structures with water molecules.

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Area of Science:

  • Peptide Chemistry
  • Crystallography
  • Structural Biology

Background:

  • Protected tetrapeptides are crucial building blocks in peptide synthesis.
  • Understanding peptide conformation and crystal packing is key to drug design.
  • The Boc-Gly-Gly-Phe-X-OMe series provides a model for studying peptide structure-property relationships.

Purpose of the Study:

  • To determine and describe the crystal structures of three specific protected tetrapeptides.
  • To analyze the conformational similarities and differences among these tetrapeptides.
  • To elucidate the intermolecular interactions and packing arrangements in their solid states.

Main Methods:

  • Single crystal X-ray diffraction was used to determine the molecular structures.
  • Analysis of hydrogen bonding networks and water molecule involvement in crystal packing.
  • Conformational analysis of the tetrapeptide backbone and side chains.

Main Results:

  • The crystal structures of Boc-Gly-Gly-L-Phe-D-Leu-OMe, Boc-Gly-Gly-L-Phe-D-Met-OMe, and Boc-Gly-Gly-D-Phe-L-Nle-OMe were determined.
  • All three tetrapeptides exhibit a similar backbone conformation.
  • A common crystal packing motif was observed, involving head-to-tail dimerization through N-H...O hydrogen bonds and further stabilization by water molecules.

Conclusions:

  • The studied protected tetrapeptides adopt a conserved conformation in the solid state.
  • Intermolecular hydrogen bonding, including water molecules, dictates the observed planar crystal structure.
  • These findings provide insights into the structural behavior of Boc-protected peptides and their crystallization properties.

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