Add time:08/18/2019         Source:sciencedirect.com

The C-terminal part (residues 106–171) of sheep κ-casein, called caseinoglycopeptide (CGP), inhibits thrombin- and collagen-induced platelet aggregation in a dose-dependent manner (mean inhibitory concentration (IC50) 215 μM and 100 μM, respectively). An enzymatic hydrolysate of CGP was fractionated by reverse phase high performance liquid chromatography: three peptides KDQDK (residues 112–116), TAQVTSTEV (residues 163–171) and QVTSTEV (residues 165–171) completely inhibited thrombin-induced platelet aggregation. CGP at a concentration near its IC50 had a very long life when incubated in human or guinea-pig plasma. An ex vivo experiment showed that 17% of CGP was found 60 min after its i.v. bolus injection in guinea-pig. By hydrophobic cluster analysis, human fibrinogen and sheep κ-casein peptides, inhibitors of platelet aggregation, were compared and we observed similarities for their C-terminal parts and for their short peptides (RGDF and KDQDK).

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