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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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The Endomembrane System and the Problem of Protein Sorting.
A. Vitale and G. Galili (2001)
Plant Physiology 125, 115-118
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A novel two-component hybrid molecule regulates vascular morphogenesis of the Arabidopsis root.
A. P. Mähönen, M. Bonke, L. Kauppinen, M. Riikonen, P. N. Benfey, and Y. Helariutta (2000)
Genes & Dev. 14, 2938-2943
   Abstract »    Full Text »
The Arabidopsis Genome. An Abundance of Soluble N-Ethylmaleimide-Sensitive Factor Adaptor Protein Receptors.
A. A. Sanderfoot, F. F. Assaad, and N. V. Raikhel (2000)
Plant Physiology 124, 1558-1569
   Abstract »    Full Text »
Cell Wall Alterations in the Arabidopsis emb30 Mutant.
D. E. Shevell, T. Kunkel, and N.-H. Chua (2000)
PLANT CELL 12, 2047-2060
   Abstract »    Full Text »
The TITAN5 Gene of Arabidopsis Encodes a Protein Related to the ADP Ribosylation Factor Family of GTP Binding Proteins.
J. McElver, D. Patton, M. Rumbaugh, C.-m. Liu, L. J. Yang, and D. Meinke (2000)
PLANT CELL 12, 1379-1392
   Abstract »    Full Text »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)