Probing the adenosine receptor with adenosine and xanthine biotin conjugates

FEBS Letters

Jacobson, Kenneth A.²  Kirk, Kenneth L.²  Daly, John W.¹  Padgett, William¹ 

[1] Laboratory of Bioorganic Chemistry, NIADDK, National Institutes of Health, Bethesda, MD 20205, USA;Laboratory of Chemistry, NIADDK, National Institutes of Health, Bethesda, MD 20205, USA

关键词: Adenosine receptor;    Biotin;    Avidin;    Functionalized congener;    N6-Phenyladenosine;    Xanthine;   

DOI  :  10.1016/0014-5793(85)80646-3

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Biotin-containing analogs of a potent agonist (N⁶ -phenyladenosine) and a potent antagonist (1,3-dipropyl-8-phenylxanthine) of adenosine receptor activity have been synthesized. A spacer chain to the biotin moiety is attached in both cases to the para-position of the phenyl ring. Two biotin conjugates of N⁶ -phenyladenosine differing only in the length of the spacer chain bind to the adenosine receptor and to avidin simultaneously. The shorter-chain derivative was more potent in inhibiting binding of N⁶ -[³H]lcyclohexyladenosine to rat cerebral cortical membranes (K _i of 11 nM in the absence of avidin, 36 nM for the avidin complex). Three biotin conjugates of 1,3-dipropyl-8-phenylxanthine bound competitively to the adenosine receptor, but only in the absence of avidin. The results are interpreted in terms of the possible orientation of the ligands at the receptor binding site.

【 授权许可】

Unknown