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• W1674184175 abstract "The bovine brain A1 adenosine receptor (A1AR) is distinct from other A1ARs in that it displays the unique agonist potency series of N6-R-phenylisopropyladenosine (R-PIA) greater than N6-S-phenylisopropyladenosine (S-PIA) greater than 5'-N-ethylcarboxamidoadenosine and has a 5-10-fold higher affinity for both agonists and antagonists. The cDNA for this receptor has been cloned from a size-selected (2-4-kb) bovine brain library and sequenced. The 2.0-kb cDNA encodes a protein of 326 amino acid residues with a molecular mass of 36,570 daltons. The amino acid sequence fits well into the seven-transmembrane domain motif typical of G protein-coupled receptors. Northern analysis in bovine tissue using the full length cDNA demonstrates mRNAs of 3.4 and 5.7 kb with a tissue distribution consistent with A1AR binding. Subcloning of the cDNA in a pCMV5 expression vector with subsequent transfection into both COS7 and Chinese hamster ovary cells revealed a fully functional A1AR which could inhibit adenylylcyclase and retained the unique pharmacologic properties of the bovine brain A1AR. The A1AR was found to have a single histidine residue in each of transmembrane domains 6 and 7. Histidine residues have been postulated by biochemical studies to be important for ligand binding. Mutation of His-278 to Leu-278 (seventh transmembrane domain) dramatically decreased both agonist and antagonist binding by greater than 90%. In contrast, mutation of His-251 to Leu-251 decreased antagonist affinity and the number of receptors recognized by an antagonist radioligand. In contrast, agonist affinity was not perturbed but the number of receptors detected by an agonist radioligand was also reduced. These data suggest that both histidines are important for both agonist and antagonist binding, but His-278 appears critical for ligand binding to occur." @default.
• W1674184175 created "2016-06-24" @default.
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• W1674184175 date "1992-05-01" @default.
• W1674184175 modified "2023-09-28" @default.
• W1674184175 title "Cloning, expression, and characterization of the unique bovine A1 adenosine receptor. Studies on the ligand binding site by site-directed mutagenesis." @default.
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• W1674184175 doi "https://doi.org/10.1016/s0021-9258(19)50084-9" @default.
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