ROOT PHOTOTROPISM 2 (RPT2) is a KAT1 potassium channel regulator required for its accumulation

• DOI: 10.1016/j.plaphy.2025.109922
• Publication Date: 2025-04-15T19:01:08Z
• Authors: Antonella Locascio; Eva Montoliu-Silv...; Manuel Nieves-Cor...; Silvia Petsch; Anika Fuchs; Claudia Bou; Alejandro Navarro...; Rosa Porcel; Nuria Andrés-Colás; Francisco Rubio; José Miguel Mulet; Lynne Yenush
• Keywords: Phototropism; Growth regulator

In plants, inward rectifying potassium channels regulate entry into guard cells and are a key factor controlling stomatal opening. KAT1 is major channel present in Arabidopsis thaliana cell membranes. The identification of regulators like promising approach for the development strategies to improve plant drought tolerance. Using high-throughput Split-ubiquitin screening yeast, we identified RPT2 (ROOT PHOTOTROPISM 2) as interactor. Here, results characterization this interaction yeast plants. Importantly, also observe increased KAT1-mediated currents oocytes co-expressing RPT2, suggesting functional link between two proteins. Moreover, using stably transformed KAT1-YFP lines, show that necessary protein accumulation A. thaliana. Our data suggest an unexpected role post-translational regulation may represent novel connection light signaling activity.