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JCS ePress online publication date 7 Mar 2006
doi: 10.1242/jcs.02847

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Research Article

The plasma membrane recycling pathway and cell polarity in plants: studies on PIN proteins


Yohann Boutté, Marie-Thérèse Crosnier, Nicola Carraro, Jan Traas, and Béatrice Satiat-Jeunemaitre*
* Author for correspondence (e-mail: bsj{at}isv.cnrs-gif.fr)

The PIN-FORMED (PIN) proteins are plasma-membrane-associated facilitators of auxin transport. They are often targeted to one side of the cell only through subcellular mechanisms that remain largely unknown. Here, we have studied the potential roles of the cytoskeleton and endomembrane system in the localisation of PIN proteins. Immunocytochemistry and image analysis on root cells from Arabidopsis thaliana and maize showed that 10-30% of the intracellular PIN proteins mapped to the Golgi network, but never to prevacuolar compartments. The remaining 70-90% were associated with yet to be identified structures. The maintenance of PIN proteins at the plasma membrane depends on a BFA-sensitive machinery, but not on microtubules and actin filaments.
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