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Structural analysis, spectroscopic characterization and molecular docking studies of the cyclic heptapeptide.
The theoretically possible stable conformer of the cyclic heptapeptide, that has significant anti-metastatic activity, was examined by conformational analysis followed by DFT calculations. Experimental infrared and Raman spectroscopy, together with theoretical DFT (6-31G (d,p) basis set)-based quantum chemical calculations, have been used to understand the structural and spectral characteristics of cyclo(Gly-Arg-Gly-Asp-Ser-Pro-Ala) {cyclo(GRGDSPA)}. A complete analysis of the vibrational spectrum has been reported on the basis of potential energy distribution (PED%) data of the vibrational modes. Finally, the calculation results were applied to simulate infrared and Raman spectra of the title compound. The simulated spectra satisfactorily coincide with the experimental spectra. In addition, molecular electrostatic potential and frontier molecular orbital analysis were investigated using theoretical calculations. The stability of the molecule, arising from hyperconjugative interaction and charge delocalization, has been analyzed using natural bond orbital analysis and a high E(2) value reveals the presence of strong interaction between donors and acceptors. Molecular docking studies with fibronectin were performed on cyclo(GRGDSPA) in order to understand its inhibitory nature. The results indicate that the docked ligand {cyclo(GRGDSPA)} forms a stable complex with human fibronectin and gives a binding affinity value of -7.7 kcal/mol, which points out that cyclo(GRGDSPA) might exhibit inhibitory activity against the attachment of melanoma cells to human fibronectin.
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