Abstract:
:The aim of this work was to obtain photoactivatable nonpeptide antagonists of the angiotensin II AT(1) receptor. Based on structure-function relationships, two chemical structures as well as appropriate synthetic schemes were chosen as a frame for the design of radiolabeled azido probes. The feasibility of the strategy was first assessed by the synthesis of two tritiated ligands 21 and 22 possessing a high affinity for the AT(1) receptor and a low nonspecific binding to membrane or cell preparations. We then prepared two unlabeled azido derivatives 7 and 14 which retained a fairly high affinity for the AT(1) receptor. The latter compound proved to be suitable for receptor irreversible labeling and was prepared in its tritiated form 28. This tritiated azido nonpeptide probe displayed a K(d) value of 11.8 nM and a low nonspecific binding. It was suitable for specific and efficient covalent labeling of the recombinant AT(1A) receptor stably expressed in CHO cells. The electrophoretic pattern of the specifically labeled entity was strictly identical to that of purified receptor photolabeled with a biotinylated peptidic photoactivatable probe. This new tool should be useful for the mapping of the nonpeptide receptor binding site. These potential applications are discussed in light of the current knowledge of molecular mechanisms of G-protein coupled receptor activation and inactivation.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Nouet S,Dodey PR,Bondoux MR,Pruneau D,Luccarini JM,Groblewski T,Larguier R,Lombard C,Marie J,Renaut PP,Leclerc G,Bonnafous JCdoi
10.1021/jm991050lkeywords:
subject
Has Abstractpub_date
1999-11-04 00:00:00pages
4572-83issue
22eissn
0022-2623issn
1520-4804pii
jm991050ljournal_volume
42pub_type
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