Synthesis and Utilization of Chiral α-Methylated α-Amino Acids with a Carboxyalkyl Side Chain in the Design of Novel Grb2-SH2 Peptide Inhibitors Free of Phosphotyrosine
作者:Ya-Qiu Long、Ting Xue、Yan-Li Song、Zu-Long Liu、Shao-Xu Huang、Qiang Yu
DOI:10.1021/jm800487r
日期:2008.10.23
alpha-aminoadipic acid (Adi) in position Y + 1. The enantiopure l(or D)-(alpha-Me)Aa bearing various chain length carboxylalkyl side chain was conveniently synthesized by an optimized oxazolidinone methodology. The incorporation of (S)-(alpha-Me)Aa into the non-pTyr-containing peptide framework with a 5-amino acid sequence binding motif of X (-2)-Leu-(3'-substituted-Tyr) (0)-X (+1)-Asn really improved the
生长因子受体结合蛋白2(Grb2)是包含SH2域的对接模块,代表抗癌治疗干预的有吸引力的目标。为了提高Grb2-SH2抑制剂的效力和生物利用度,设计了手性α-甲基-α-羧基烷基氨基酸[(α-Me)Aa],以涵盖1-氨基环己烷羧酸(Ac6c )和Y + 1处的α-氨基己二酸(Adi)。通过优化的恶唑烷酮方法可方便地合成带有各种链长羧基烷基侧链的对映体纯1(或D)-(α-Me)Aa。(S)-(α-Me)Aa掺入具有X(-2)-Leu-(3' -取代的Tyr)(0)-X(+1)-Asn确实提高了抑制活性,提供了强力的(R)-亚砜桥连的环状和Grb2-SH2域的五肽抑制剂的开链系列(IC 50 = 1.1-5.8 microM)。更重要的是,由于肽性质的降低和pTyr或Pdyr的缺失,这些(α-Me)Aa结合的肽抑制剂在抑制具有低微摩尔IC 50值的erbB2依赖性MDA-MB-453肿瘤细胞系生长方面表现出出色的活性。