Abstract
The theoretical conformational analysis of the biologically active RGD-containing pentapeptide cyclo(-Arg-Gly-Asp-Phe-DVal-), an inhibitor of laminin P1 interaction with its receptor, was performed. The space of permissible torsional angles of the backbone of the molecule was studied by the Monte Carlo method. From the large number of predicted low-energy conformers with various packings of the cyclic moiety of this pentapeptide, only those were selected that corresponded to stable structures of the model linear tripeptide Ac-Ala-Gly-Asp-NHMe. This peptide simulated the spatial possibilities of the backbones of RGD-containing fragments of laminin, vitronectin, and fibronectin. We selected several dozen structures that may be potential biologically active conformers, but only a few of them were capable of forming stable intramolecular hydrogen bonds. We assumed that a biologically active conformer of cyclo(-Arg-Gly-Asp-Phe-DVal-) can be present in significant amounts in an equilibrium mixture in solution along with other conformers without necessarily dominating among them.
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Kostetsky, P.V., Artem’ev, I.V. A conformational analysis of biologically active RGD-containing cyclopentapeptides. Russ J Bioorg Chem 26, 262–270 (2000). https://doi.org/10.1007/BF02759165
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DOI: https://doi.org/10.1007/BF02759165