Pseudoproline-Containing Analogues of Morphiceptin and Endomorphin-2: Evidence for a <i>Cis</i> Tyr−Pro Amide Bond in the Bioactive Conformation
作者:Michael Keller、Christophe Boissard、Luc Patiny、Nga N. Chung、Carole Lemieux、Manfred Mutter、Peter W. Schiller
DOI:10.1021/jm000332e
日期:2001.11.1
analogues with a trans conformation around the Tyr-Xaa[Psi(CH(3),CH(3)pro)] imide bond were detected by (1)H NMR spectral analysis, indicating that in these compounds the cis conformation is highly predominant (>98%). These results represent the most direct evidence obtained so far to indicate that morphiceptin and endomorphin-2 have the cis conformation around the Tyr-Pro peptide bond in their bioactive
阿片肽[D-Phe(3)]吗啡肽(H-Tyr-Pro-D-Phe-Pro-NH(2))和endomorphin-2(H-Tyr-Pro-Phe-Phe-NH(2)的类似物))含有拟脯氨酸(Psi Pro)(4R)-噻唑烷-4-羧酸(Cys [Psi(R1,R2)pro])或(4S)-恶唑烷-4-羧酸(Ser [Psi(R1,R2 )pro])代替Pro(2)。这些化合物中的伪脯氨酸环在2-C位置未取代(R(1),R(2)= H)或二甲基化(R(1),R(2)= CH(3))。已知2-C-二甲基化假脯氨酸是Xaa(i-1)-Xaa(i)[Psi(CH(3),CH)(3)pro)酰亚胺键周围顺式构象的定量或近定量诱导剂。在豚鼠回肠(GPI)分析中,所有含二氢伪脯氨酸的类似物(R(1),R(2)= H)均显示出良好的mu阿片样物质激动剂效能,在大鼠脑膜结合测定中具有高mu受体结合亲和力,并且,像