Premium
Studies on ion channel antagonist‐binding sites in sunflower protoplasts
Author(s) -
Vallée N.,
Brière C.,
Petitprez M.,
Barthou H.,
Souvré A.,
Alibert G.
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)00675-3
Subject(s) - biophysics , bodipy , bepridil , chemistry , antagonist , binding site , protoplast , verapamil , ion channel , biochemistry , calcium , fluorescence , receptor , biology , physics , organic chemistry , quantum mechanics
The cytological location of ion channel antagonist‐binding sites was studied in sunflower protoplasts using the fluorescent probes DM–Bodipy–PAA and DM–Bodipy–DHP. The binding specificity of the probes was established by competition experiments with Bepridil, phenylalkylamine (Verapamil) and dihydropyridine (Nifedipine) which are known as calcium and potassium channel antagonists. Quantitative image analysis of the fluorescence emitted by the protoplasts showed the existence of interactions between PAA‐ and DHP‐binding sites. Moreover, studies on the cytolocalization of the PAA receptors by confocal imaging showed that in freshly isolated protoplasts, DM–Bodipy–PAA binds exclusively at sites located in the cortical region of the cell.