Cyclic RGD Peptidomimetics Containing Bifunctional Diketopiperazine Scaffolds as New Potent Integrin Ligands (Articolo in rivista)

Type
Label
  • Cyclic RGD Peptidomimetics Containing Bifunctional Diketopiperazine Scaffolds as New Potent Integrin Ligands (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/chem.201200457 (literal)
Alternative label
  • Mattia Marchini; Michele Mingozzi; Raffaele Colombo; Ileana Guzzetti; Laura Belvisi; Francesca Vasile; Donatella Potenza; Umberto Piarulli; Daniela Arosio; Cesare Gennari (2012)
    Cyclic RGD Peptidomimetics Containing Bifunctional Diketopiperazine Scaffolds as New Potent Integrin Ligands
    in Chemistry (Weinh., Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mattia Marchini; Michele Mingozzi; Raffaele Colombo; Ileana Guzzetti; Laura Belvisi; Francesca Vasile; Donatella Potenza; Umberto Piarulli; Daniela Arosio; Cesare Gennari (literal)
Pagina inizio
  • 6195 (literal)
Pagina fine
  • 6207 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 18 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 20 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Mattia Marchini; Michele Mingozzi; Raffaele Colombo; Ileana Guzzetti; Laura Belvisi; Francesca Vasile; Donatella Potenza; Cesare Gennari: Univ Milan, Dipartimento Chim Organ & Ind, I-20133 Milan, Italy Daniela Arosio: CNR, Istituto di Scienze e tecnologie Molecolari (ISTM), Via Venezian 21, I-20133 Milan, Italy Umberto Piarulli: Univ Insubria, Dipartimento Sci & Alta Tecnol, I-22100 Como, Italy (literal)
Titolo
  • Cyclic RGD Peptidomimetics Containing Bifunctional Diketopiperazine Scaffolds as New Potent Integrin Ligands (literal)
Abstract
  • The synthesis of eight bifunctional diketopiperazine (DKP) scaffolds is described; these were formally derived from 2,3-diaminopropionic acid and aspartic acid (DKP-1DKP-7) or glutamic acid (DKP-8) and feature an amine and a carboxylic acid functional group. The scaffolds differ in the configuration at the two stereocenters and the substitution at the diketopiperazinic nitrogen atoms. The bifunctional diketopiperazines were introduced into eight cyclic peptidomimetics containing the Arg-Gly-Asp (RGD) sequence. The resulting RGD peptidomimetics were screened for their ability to inhibit biotinylated vitronectin binding to the purified integrins alphavbeta3 and alphavbeta5, which are involved in tumor angiogenesis. Nanomolar IC50 values were obtained for the RGD peptidomimetics derived from trans DKP scaffolds (DKP-2DKP-8). Conformational studies of the cyclic RGD peptidomimetics by 1H NMR spectroscopy experiments (VT-NMR and NOESY spectroscopy) in aqueous solution and Monte Carlo/Stochastic Dynamics (MC/SD) simulations revealed that the highest affinity ligands display well-defined preferred conformations featuring intramolecular hydrogen-bonded turn motifs and an extended arrangement of the RGD sequence [C beta(Arg)-C beta(Asp) average distance >8.8 angstrom]. Docking studies were performed, starting from the representative conformations obtained from the MC/SD simulations and taking as a reference model the crystal structure of the extracellular segment of integrin alphavbeta3 complexed with the cyclic pentapeptide, Cilengitide. The highest affinity ligands produced top-ranked poses conserving all the important interactions of the X-ray complex. (literal)
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