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Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting
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Conformation/activity studies of rationally designed potent anti-adhesive RGD peptides.

M Gurrath1, G Müller, H Kessler

  • 1Organisch-Chemisches Institut, Technische Universität München, Federal Republic of Germany.

European Journal of Biochemistry
|December 15, 1992
PubMed
Summary

Designing cyclic peptides based on the Arg-Gly-Asp (RGD) sequence can yield potent antagonists for integrin receptors. This study reveals how specific RGD conformations enhance anti-adhesive activity, guiding future drug design.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Drug Design

Background:

  • The Arg-Gly-Asp (RGD) sequence is crucial for cell adhesion, interacting with integrin receptors.
  • Developing small-molecule RGD antagonists requires understanding their active conformations.

Purpose of the Study:

  • To investigate the conformational space of the RGD sequence.
  • To design and synthesize cyclic peptides with specific RGD conformations.
  • To correlate RGD conformation with biological activity against integrin-mediated adhesion.

Main Methods:

  • Systematic conformational analysis of the RGD sequence.
  • Design and synthesis of homodetic cyclic pentapeptides and hexapeptides.
  • Structural determination using 2D NMR and molecular dynamics simulations.
  • Biological assays measuring inhibition of tumor cell adhesion.

Main Results:

  • Two cyclic pentapeptides showed up to 100-fold increased anti-adhesive activity.
  • Conformational variations correlated with significant changes in biological activity.
  • Established structure-activity relationships for RGD-containing peptides.

Conclusions:

  • Conformationally constrained RGD peptides can be potent integrin antagonists.
  • This approach provides lead structures for rational drug design targeting cell-matrix and cell-cell interactions.
  • The findings facilitate the development of peptide and peptidomimetic pharmaceuticals.