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Science 8 October 1999:
Vol. 286. no. 5438, pp. 316 - 318
DOI: 10.1126/science.286.5438.316
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Reports

Coordinated Polar Localization of Auxin Efflux Carrier PIN1 by GNOM ARF GEF

Thomas Steinmann, 1 Niko Geldner, 1 Markus Grebe, 1 Stefan Mangold, 1 Catherine L. Jackson, 2 Sonia Paris, 3 Leo Gälweiler, 4 Klaus Palme, 4 Gerd Jürgens 1*

The plant hormone auxin is transported in a polar manner along the shoot-root axis, which requires efflux carriers such as PIN1. Asymmetric localization of PIN1 develops from a random distribution in Arabidopsis early embryogenesis. Coordinated polar localization of PIN1 is defective in gnom embryos. GNOM is a membrane-associated guanine-nucleotide exchange factor on ADP-ribosylation factor G protein (ARF GEF). Thus, GNOM-dependent vesicle trafficking may establish cell polarity, resulting in polar auxin transport.

1 Entwicklungsgenetik, Zentrum für Molekularbiologie der Pflanzen, Universität Tübingen, Auf der Morgenstelle 1, D-72076 Tübingen, Germany.
2 Service de Biochimie et Génétique Moléculaire, Commissariat à l'Energie Atemique/Saclay, F-91191 Gif-sur-Yvette, France.
3 Institut de Pharmacologie Moléculaire et Cellulaire du Centre National de la Recherche Scientifique, Sophia Antipolis, F-06560 Valbonne, France.
4 Max-Delbrück-Laboratorium in der Max-Planck-Gesellschaft, D-50829 Köln, Germany.
*   To whom correspondence should be addressed. E-mail: gerd.juergens{at}uni-tuebingen.de

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