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Structure-activity relationship studies on cyclic RGD peptides utilizing novel alkene dipeptide isosteres.

Shinya Oishi1

  • 1Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan. soishi@pharm.kyoto-u.ac,jp

Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|May 1, 2004
PubMed
Summary

This study explores cyclic RGD peptides, synthesizing novel isosteres to understand how a valine N-methyl group impacts bioactivity and integrin antagonism. Findings reveal structural influences on alpha(V)beta(3) and alpha(IIb)beta(3) integrin interactions.

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Area of Science:

  • Medicinal Chemistry
  • Peptide Chemistry
  • Biochemistry

Background:

  • Cyclic Arg-Gly-Asp (RGD) peptides are crucial for targeting integrins.
  • Understanding structure-activity relationships (SAR) is key to developing potent integrin antagonists.
  • The N-methyl group in valine residues can influence peptide conformation and bioactivity.

Purpose of the Study:

  • To investigate the impact of a valine N-methyl group on the bioactivity of cyclic RGD peptides.
  • To synthesize and evaluate novel dipeptide isosteres for SAR studies.
  • To elucidate the conformational effects of structural modifications on integrin binding.

Main Methods:

  • Synthesis of novel D-Phe-Val-type dipeptide isosteres with methyl-substituted olefins.
  • Utilized solution- and solid-phase peptide synthesis to create cyclic RGD peptidomimetics.
  • Evaluated alpha(V)beta(3) and alpha(IIb)beta(3) integrin antagonistic activities.
  • Performed structural calculations using simulated annealing and NMR data.

Main Results:

  • Successfully synthesized four novel isosteres and corresponding cyclic RGD peptidomimetics.
  • Comparative evaluation of integrin antagonistic activities revealed structure-dependent effects.
  • Structural analysis provided insights into the influence of the valine N-methyl group and D-phenylalanine carbonyl oxygen.

Conclusions:

  • The valine N-methyl group significantly influences the bioactivity and integrin antagonism of cyclic RGD peptides.
  • Novel dipeptide isosteres are valuable tools for SAR studies in integrin antagonist development.
  • Conformational changes induced by structural modifications impact interactions with alpha(V)beta(3) and alpha(IIb)beta(3) integrins.