Nucleosides and Nucleotides. 200. Reinvestigation of 5‘-<i>N</i>-Ethylcarboxamidoadenosine Derivatives: Structure−Activity Relationships for P<sub>3</sub> Purinoceptor-like Proteins
作者:Takashi Umino、Kazuaki Yoshioka、Yoshiko Saitoh、Noriaki Minakawa、Hiroyasu Nakata、Akira Matsuda
DOI:10.1021/jm000150k
日期:2001.1.1
protein (P(3)LP), due to its ligand specificity, have not been fully elucidated, we needed a specific ligand to obtain further information about the receptor. We examined the structure-activity relationship (SAR) of various 5'-N-substituted-carboxamidoadenosine derivatives toward P(3)LP and discovered a hydrophobic binding region near the 5'-N-substituted-carboxamide group. From the linear alkyl N-substituted
ATP在兔胸主动脉中的非P(1)和非P(2)肌肉松弛作用最近归因于推定的P(3)嘌呤受体,该受体被腺苷或ATP激活。由于此假定的P(3)嘌呤受体和新的[(3)H] -5'-N-乙基羧酰胺基腺苷(NECA)结合蛋白从大鼠脑膜的生理作用,称为P(3)嘌呤受体样蛋白(P (3)LP),由于其配体特异性尚未完全阐明,我们需要特定的配体以获得有关受体的进一步信息。我们检查了各种5'-N-取代的羧酰胺基腺苷衍生物对P(3)LP的结构-活性关系(SAR),并发现了5'-N-取代的羧酰胺基附近的疏水结合区。从直链烷基N-取代的衍生物,Nn-戊基衍生物10被发现是最有效的配体,其K(i)值为12 nM。在一系列N-环烷基衍生物中,N-环己基衍生物27是最强的配体,其K(i)值为18 nM。另一方面,具有支链烷基侧链和庞大的环烷基的N-取代基对P(3)LP没有任何有效的亲和力。因此,疏水口袋容纳大约10个碳原