Photoaffinity labeling of human platelet and rabbit kidney α2-adrenoceptors with [3H]SKF 102229

John W. Regan, John R. Raymond, Robert J. Lefkowitz, Robert M. DeMarinis

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


A newly developed α2-adrenergic photoaffinity ligand, 3-methyl-6-chloro-9-azido-1H-2,3,4,5-tetrahydro-3-benzazepine (SKF 102229), has been radiolabeled with tritium to a specific activity of ∼ 80 Ci/mmol. Using membranes prepared from human platelets and from rabbit kidney, α2-adrenoceptors have been covalently labeled following photolysis in the presence of [3H]SKF 102229. As determined by SDS-PAGE, the apparent molecular weight of α2-adrenoceptors from both of these tissues was 64,000. The yield of covalent insertion of [3H]SKF 102229 into the α2-adrenoceptor was very good. Thus, following photolysis up to 90% of the α2-adrenoceptors could be irreversibly labeled with [3H]SKF 102229.

Original languageEnglish (US)
Pages (from-to)606-613
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number2
StatePublished - Jun 13 1986

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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