Potent in vitro and in vivo inhibitors of platelet aggregation based upon the Arg-Gly-Asp-Phe sequence of fibrinogen. A proposal on the nature of the binding interaction between the Arg-guanidine of RGDX mimetics and the platelet GP IIb-IIIa receptor
作者:Jeffery A. Zablocki、Masateru Miyano、Robert B. Garland、Daisy Pireh、Lori Schretzman、Shashidhar N. Rao、Richard J. Lindmark、Susan G. Panzer-Knodle、Nancy S. Nicholson
DOI:10.1021/jm00065a003
日期:1993.6
Peptide mimetics of the RGDF sequence in which Arg-Gly has been replaced with 5-(4-amidinophenyl)pentanoyl mimetic has led to a 1000-fold increase in inhibitory potency over the natural RGDF ligand. The guanidine residue of the arginine may be involved in a reinforced ionic interaction with a carboxylate of the receptor which could explain the dramatic increase in potency upon replacement with benzamidine
RGDF序列的肽模拟物(其中Arg-Gly已被5-(4- ino基苯基)戊酰基模拟物替代)导致抑制力比天然RGDF配体提高了1000倍。精氨酸的胍基残基可能与受体的羧酸盐参与增强的离子相互作用,这可以解释在用苄am取代后效能显着增加。观察到相应的苄胺的抑制力低(18),而与相应的咪唑啉衍生物(19)没有活性,则支持了这一假设。另外,对各个配合物的从头算计算表明,苄am-羧酸盐比胍-羧酸盐相互作用更有利。