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Updated: Aug 15, 2025

Detection of Ligand-activated G Protein-coupled Receptor Internalization by Confocal Microscopy
Published on: April 9, 2017
BRASSINOSTEROID INSENSITIVE1 internalization can occur independent of ligand binding
Lucas Alves Neubus Claus1,2, Derui Liu1,2, Ulrich Hohmann3
1Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium.
None:
The brassinosteroid (BR) hormone and its plasma membrane (PM) receptor BR INSENSITIVE1 (BRI1) are one of the best-studied receptor-ligand pairs for understanding the interplay between receptor endocytosis and signaling in plants. BR signaling is mainly determined by the PM pool of BRI1, whereas BRI1 endocytosis ensures signal attenuation. As BRs are ubiquitously distributed in the plant, the tools available to study the BRI1 function without interference from endogenous BRs are limited. Here, we designed a BR binding-deficient Arabidopsis (Arabidopsis thaliana) mutant based on protein sequence-structure analysis and homology modeling of members of the BRI1 family. This tool allowed us to re-examine the BRI1 endocytosis and signal attenuation model. We showed that despite impaired phosphorylation and ubiquitination, BR binding-deficient BRI1 internalizes similarly to the wild type form. Our data indicate that BRI1 internalization relies on different endocytic machineries. In addition, the BR binding-deficient mutant provides opportunities to study non-canonical ligand-independent BRI1 functions.
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