small peptides with the sequence mAZ-pTyr-Xaa-Asn-NH(2), where Xaa denotes alpha-methylphosphotyrosine or its carboxylic mimetics, were synthesized as inhibitors of the Grb2 SH2 domain. Peptide 3 with (alpha-Me)pTyr as Xaa has the highest affinity for Grb2 (K(d) = 3 +/- 1 nM) and exhibits to date the best inhibitory activity (IC(50) = 11 +/- 1 nM) to displace PSpYVNVQN-Grb2 interaction in an ELISA test
合成了一系列序列为mAZ-pTyr-Xaa-Asn-NH(2)的小肽,其中Xaa表示α-甲基
磷酸酪氨酸或其羧基模拟物,作为Grb2 SH2域的
抑制剂。具有(aa-Me)pTyr作为Xaa的肽3对Grb2的亲和力最高(K(d)= 3 +/- 1 nM),迄今为止显示出最佳的抑制活性(IC(50)= 11 +/- 1 nM )以取代ELI
SA测试中的PSpYVNVQN-Grb2相互作用。具有(alpha-Me)Tyr,(alpha-Me)Phe(4-CO(2)H)或(alpha-Me)Phe(4-CH(2)CO(2)H)的肽的较低亲和力Xaa证明了在pY + 1位置带有双电荷的
磷酸基团的重要性。分子建模显示了由(alpha-Me)pTyr残基与Grb2 SH2域提供的其他氢键相互作用。因此,这些结果表明,疏
水性pY + 1残基的作用