Designed Beta-Turn Mimic Based on the Allylic-Strain Concept: Evaluation of Structural and Biological Features by Incorporation into a Cyclic RGD Peptide (Cyclo(-L-arginylglycyl-L--aspartyl-))
作者:Martin Sukopp、Luciana Marinelli、Markus Heller、Trixi Brandl、Simon L. Goodman、Reinhard W. Hoffmann、Horst Kessler
DOI:10.1002/hlca.200290021
日期:2002.12
extended conformation. The structural features of the RGD sequence of 4 were compared with the RGD moiety of cyclo(-RGDfV-) (=cyclo(-Arg-Gly-Asp-D-Phe-Val-)). In contrast to cyclo(-RGDfV-), which is a highly active αvβ3 antagonist and selective against αIIbβ3, cyclo(-RGD-ATUA-) shows a lower activity and selectivity. The structure of the ATUA residue in the cyclic peptide resembles a βII′-turn-like
的(3 - [R,5小号,6 ê,8小号,10 - [R)-11-氨基3,5,8,10-tetramethylundec -6-烯酸(阿图阿; 1),其被设计成一个β II'根据烯丙基菌株和2,4-二甲基戊烷单元的概念,将转弯模拟物掺入环状RGD肽中。通过NMR技术,距离几何计算和分子动力学模拟,确定了H 2 O中环(-RGD-ATUA-)(=环(-Arg-Gly-Asp-ATUA-))4的三维结构。RGD序列4具有较高的构象灵活性,但对扩展构象有些偏爱。将4的RGD序列的结构特征与环(-RGDfV-)(=环(-Arg-Gly-Asp-D-Phe-Val-))的RGD部分进行比较。与此相反,以环(-RGDfV-),它是一种高活性α v β 3拮抗剂和选择性的抗α IIB β 3,环(-RGD-ATUA-)示出了较低的活性和选择性。所述阿图阿的结构残基在环肽类似于β II'-转弯状构象。它的