Design and Synthesis of Potent Hexapeptide and Heptapeptide Gonadotropin-Releasing Hormone Antagonists by Truncation of a Decapeptide Analogue Sequence
作者:Dror Yahalom、Shai Rahimipour、Yitzhak Koch、Nurit Ben-Aroya、Mati Fridkin
DOI:10.1021/jm990433g
日期:2000.7.1
truncation strategy was successful for generation of reduced-size hexapeptide and heptapeptide antagonists possessing potent antagonistic capacity. The same methodology was not suitable for the generation of reduced-size agonists, suggesting different conformational characteristics for GnRH agonists and antagonists. A heptapeptide antagonist designed by this method was shown to inhibit serum levels of luteinizing
开发了一种设计减小十肽促性腺激素释放激素(GnRH)类似物尺寸的新策略。与以前尝试从任一肽的末端删除残基的尝试相反,我们的方法基于已知的GnRH类似物的C端和N端对受体识别的重要性,而分子的中心部分被短的取代垫片。当前的截断策略成功地产生了具有有效拮抗能力的尺寸减小的六肽和七肽拮抗剂。相同的方法不适用于减小尺寸的激动剂的产生,这提示GnRH激动剂和拮抗剂的构象特征不同。通过这种方法设计的七肽拮抗剂显示在体内可抑制去势大鼠血清黄体生成素的水平。结构活性研究表明,GnRH受体识别的结构偏好与十肽拮抗剂报道的相似。我们的研究产生了一种七肽GnRH拮抗剂(Ac-D-Nal2-D-Cpa-D-Pal-Gly-Arg-Pro-D-Ala-NH2),与之相比,该受体具有高受体结合亲和力(IC50 = 7 nM) GnRH本身的值(IC50 = 2 nM)。我们合成的六肽拮抗剂的最高亲和力较低(IC50 =