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N-methylated cyclic pentaalanine peptides as template structures.

Jayanta Chatterjee1, Dale Mierke, Horst Kessler

  • 1Department Chemie, Lehrstuhl II für Organische Chemie, Technische Universität München, Lichtenbergstrasse 4, Garching D-85747, Germany.

Journal of the American Chemical Society
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N-methylation of cyclic peptides enhances bioavailability and allows for conformational control. This study synthesized and analyzed N-methylated peptides, identifying seven with stable single conformations for drug design.

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Area of Science:

  • Medicinal Chemistry
  • Peptide Chemistry
  • Structural Biology

Background:

  • N-methylation of peptides modulates activity, selectivity, and bioavailability (ADMET profile) by altering flexibility and lipophilicity.
  • Conformationally constrained cyclic peptides are valuable for drug design and understanding biological systems.

Purpose of the Study:

  • To synthesize and characterize a library of N-methylated cyclic peptides to identify conformationally stable structures.
  • To establish templates for rational drug design and spatial screening of medically important peptide systems.

Main Methods:

  • Synthesis of a library of 30 N-methylated cyclic peptides with the sequence cyclo(-D-Ala-L-Ala4-).
  • Nuclear Magnetic Resonance (NMR) analysis to determine conformational stability.
  • Distance geometry and molecular dynamics simulations in explicit DMSO for structural refinement.

Main Results:

  • Seven out of 30 synthesized N-methylated peptides exhibited single, stable conformations (>98% population).
  • Detailed structural features of these conformationally constrained peptides were elucidated.
  • The study provides a foundation for understanding structure-activity relationships in N-methylated cyclic peptides.

Conclusions:

  • N-methylation is an effective strategy for achieving conformational constraint in cyclic peptides.
  • The identified stable peptide conformations can serve as templates for designing novel therapeutics.
  • This work facilitates the spatial screening of bioactive conformations for peptide-based drugs.