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Gewählte Publikation:

Langowski, L; RÅ¯zicka, K; Naramoto, S; Kleine-Vehn, J; Friml, J.
(2010): Trafficking to the outer polar domain defines the root-soil interface.
Curr Biol. 2010; 20(10):904-908 FullText FullText_BOKU

Abstract:: In animals, the interface between organism and environment is constituted by the epithelium [1]. In plants, the exchange of nutrients and signals between root and soil is crucial for their survival, but the cellular mechanisms underlying the epithelium-like function and specific localization of proteins to the root surface have not been identified [2]. Here we analyze the mechanism of polar delivery to the root-soil interface of the proteins BOR4, ABCG37, and PEN3, which transport nutrients [2], transport plant hormones, and are required for pathogen defense [3], respectively. The simultaneous visualization of these proteins and the apical and basal cargos in a single cell demonstrates that the outermost cell side represents an additional polar domain. Delivery to this outer polar domain depends on ARF GEF [4] and actin [5-8] function but does not require known molecular components of the apical or basal targeting. The outer polar delivery is, in contrast to known basal and apical cargos [9, 10], mediated by the polar secretion. Our findings show that the outermost cell membranes of roots define an additional polar domain in plant cells along with a specific, previously uncharacterized, polar targeting mechanism that is important for defining the functional, epithelium-like root-soil interface.
Autor*innen der BOKU Wien:: Kleine-Vehn Jürgen
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Find related publications in this database (using NML MeSH Indexing): ATP-Binding Cassette Transporters - genetics; Animals -; Antiporters - genetics; Arabidopsis - anatomy & histology; Arabidopsis Proteins - genetics; Biological Transport - physiology; Plant Roots - cytology; Recombinant Fusion Proteins - genetics; Signal Transduction - physiology; Soil -