Three types of Arg–Gly–Asp–Ser–Pro–Ala–Ser–Ser (RGDSPASS)-containing cystine peptides, FR-1, FR-2, and FR-3, were designed and synthesized. These cyclic peptides exhibited high activities as a platelet aggregation inhibitor. Using rabbit platelet-rich plasma, the IC50 values of FR-1, FR-2, and FR-3 were found to be 67, 280, and 135 μM, respectively. In each peptide, the position of the Pro residue was either i + 1 or i + 2 in the turn, as observed by NMR (ROESY, NOESY, and H–D exchange of amide proton).
设计并合成了三种类型的 Arg-Gly-A
SP-Ser-Pro-Ala-Ser-Ser (RGD
SPASS) 含有胱
氨酸肽 FR-1、FR-2 和 FR-3。这些环肽表现出作为血小板聚集
抑制剂的高活性。使用富含兔血小板的血浆,发现 FR-1、FR-2 和 FR-3 的 IC50 值分别为 67、280 和 135 μM。在每个肽中,Pro 残基的位置依次为 i + 1 或 i + 2,如 NMR(ROESY、NOESY 和酰胺质子的 H-D 交换)所观察到的。