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We examined the structure-activity relationship of various 5'-N-substituted-carboxamidoadenosine derivatives toward P3 purinoceptor-like protein (P3LP), which has affinity for both adenine nucleosides and nucleotides. We discovered a hydrophobic binding region near the 5'-N-substituted-carboxamide group. From the linear alkyl N-substituted derivatives, 1-(adenin-9-yl)-1-deoxy-N-n-pentyl-beta-D-ribofuranuronamide (6) was found to be the most potent ligand. In the series of the N-cycloalkyl derivatives, 1-(adenin-9-yl)-1-deoxy-N-cyclohexyl-beta-D-ribofuranuronamide (8) was the strongest ligand. We also examined the receptor selectivity for the selected nucleosides 6 and 8 with 1 (HAK2701) and N-ethylcarboxamidoadenosine (NECA) versus P1 purinoceptor subtypes, such as adenosine A1, A2A, A2B, and A3 receptors and found 8 is the most selective ligand for P3LP.

Synthesis and structure-activity relationships of selective ligands for P3purinoceptor-like protein (P3LP)