The disclosure is directed to a G-protein coupled receptor complex. The complex includes (i) a chimeric G protein-coupled receptor (GPCR) comprising a non-native amino acid sequence located within the C-terminus of the GPCR and a synthetic phosphopeptide ligated to the non-native amino acid sequence; and (ii) a β-arrestin (βarr) protein bound to the C-terminus of the GPCR. The disclosure also provides an in vitro method for producing the aforementioned complex, as well as methods for identifying compounds or ligands which bind to and modulate the activity of the complex. Positive allosteric modulators of the β2 adrenergic receptor identified by screening a DNA-encoded library potentiate the activity of β2 agonists and have application in the treatment of obstructive airway disease, bronchospasm, or pre-term labor.
该披露涉及一个G蛋白偶联受体复合物。该复合物包括(i) 一个嵌合G蛋白偶联受体(
GPCR),其中包括位于
GPCR C-末端内的非天然
氨基酸序列和与非天然
氨基酸序列连接的合成
磷酸肽;以及(ii) 一个结合到
GPCR C-末端的β-阻滞蛋白(βarr)。该披露还提供了一种用于生产上述复合物的体外方法,以及用于识别结合并调节复合物活性的化合物或
配体的方法。通过筛选DNA编码文库鉴定的β2
肾上腺素受体的正向变构调节剂增强β2激动剂的活性,并在治疗阻塞性气道疾病、支气管痉挛或早产劳动中应用。