Related Experiment Video
Updated: May 19, 2026

Lateral Root Inducible System in Arabidopsis and Maize
Published on: January 14, 2016
Dynamics in PIN2 auxin carrier ubiquitylation in gravity-responding Arabidopsis roots
Johannes Leitner1, Katarzina Retzer, Barbara Korbei
1Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna (BOKU), Wien, Austria. christian.luschnig@boku.ac.at
Abstract:
Plant tropisms are decisively influenced by dynamic adjustments in spatiotemporal distribution of the growth regulators auxin. Polar auxin transport requires activity of PIN-type auxin carrier proteins, with their distribution at the plasma membrane significantly contributing to the directionality of auxin flow. Control of PIN protein distribution involves regulation of their endocytosis and further sorting into the lytic vacuole for degradation and recently, protein ubiquitylation has been demonstrated to control degradative sorting of plasma membrane proteins in plants. ( 1) (-) ( 6) Here we show dynamic adjustments in PIN2 ubiquitylation in gravity-stimulated roots, a response that coincides with establishment of a lateral PIN2 expression gradient. Our results imply that perception and transduction of gravity signals triggers differential ubiquitylation of PIN2, which might feed back on the coordination of auxin distribution in root meristems.
Related Concept Videos
Cell Signaling in Plants
Responses to Gravity and Touch
Short-distance Transport of Resources
Water and Mineral Acquisition
Cell Adhesion in Plants
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
Pinching-off of Coated Vesicles

