The present invention relates to G protein peptidomimetics capable of stabilizing a GPCR in an active conformational state. The G protein peptidomimetics are derived from the G protein epitope interacting with the GPCR, in particular from the C-terminus of the α5 helix comprising the amino acid sequence FNDCRDIIQRMHLRQYELL (SEQ ID NO:117). The invention further provides complexes of the G protein peptidomimetics and a GPCR, fusion polypeptides of a GPCR and the G protein peptidomimetics and compositions comprising the same. Further disclosed herein are uses of the G protein peptidomimetics, complexes, fusion polypeptides and compositions for determining the structure of the GPCR conformer and for screening for compounds capable of specifically binding to the GPCR conformer.
本发明涉及能够将
GPCR 稳定在活性构象状态的 G 蛋白拟肽物。G 蛋白拟肽物来自与
GPCR 相互作用的 G 蛋白表位,特别是来自由
氨基酸序列 FNDCRDIIQR
MHLRQYELL(
SEQ ID NO:117)组成的 α5 螺旋的 C 端。本发明进一步提供 G 蛋白拟肽物与
GPCR 的复合物、
GPCR 与 G 蛋白拟肽物的融合
多肽以及包含这些复合物的组合物。本文进一步公开了 G 蛋白拟肽物、复合物、融合
多肽和组合物在确定
GPCR 构象的结构和筛选能够与
GPCR 构象特异性结合的化合物方面的用途。