Cyclopentapeptides containing the Arg-Gly-Asp motif have been synthesised using solid-phase assembly of side-chain-protected linear precursors, followed by solution-phase cyclisation. The replacement of the Asp residue by γ-carboxyglutamic acid (Gla) is a novel feature which gives rise to an analogue which inhibits cell adhesion, yet its congeners do not show activity in binding assays with recombinant integrin receptors. NMR techniques support a β/γ-turn conformation in most of the analogues.
含有Arg-Gly-Asp基序的环五肽是通过固相合成侧链保护的线性前体,然后进行液相环化合成的。以γ-羧基谷
氨酸(Gla)取代Asp残基是一项新颖的特征,这使得该类似物能够抑制细胞粘附,而其同类物在与
重组整合素受体的结合实验中则未显示活性。NMR技术支持大多数类似物具有β/γ-转角构象。