Design of angiotensin II derivatives suitable for indirect affinity techniques: potential applications to receptor studies.

The design of angiotensin II (A II)-derived probes suitable for indirect affinity techniques is presented. Biotin or dinitrophenyl moieties have been added at the N-terminus of A II, through aminohexanoic acid as spacer arm, to generate (6-biotinylamido)-hexanoyl-AII (Bio-Ahx-AII) and dinitrophenyl- aminohexanoyl-AII (Dnp-Ahx-AII). Monoiodinated and highly labeled radioiodinated forms of these probes have been prepared. The two bifunctional ligands displayed high affinities for rat liver A II receptors (Kd values in the nanomolar range) and their secondary acceptors: streptavidin and monoclonal anti-Dnp antibodies respectively. Bio-Ahx-AII and Dnp-Ahx-AII behaved as agonists on several AII-sensitive systems. Based on these structural assessments, the parent photoactivable azido probe: Bio-Ahx-(Ala1,Phe(4N3)8)A II. A II was synthesized and proved to possess similar biological properties than the non-azido compound. The hepatic A II receptor could be covalently labeled by the radioiodinated probe, with a particularly high yield (15-20%); SDS-polyacrylamide gel electrophoresis of solubilized complexes revealed specific labeling of a 65 Kdaltons binding unit, in agreement with previous data obtained with other azido AII-derived compounds. The potential applications of these probes are: i) receptor purification by combination of its photoaffinity labeling and adsorption of biotin-tagged solubilized hormone-receptor complexes on avidin gels. ii) cell labeling and sorting. iii) histochemical receptor visualization.

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