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First published online May 1, 2003; 10.1105/tpc.010884

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The Plant Cell, Vol. 15, 1310-1319, June 2003, Copyright © 2003,
American Society of Plant Biologists

Arabidopsis SGT1b Is Required for SCFTIR1-Mediated Auxin Response

William M. Gray1,a, Paul R. Muskettb, Huey-wen Chuanga and Jane E. Parkerb,c

a Department of Plant Biology, University of Minnesota–Twin Cities, St. Paul, Minnesota 55108
b The Sainsbury Laboratory, John Innes Centre, Colney, Norwich NR4 7UH, United Kingdom
c Department of Plant–Microbe Interactions, Max-Planck-Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, D-50829 Cologne, Germany

1 To whom correspondence should be addressed. E-mail grayx051{at}tc.umn.edu; fax 612-625-1738

The SCFTIR1 complex is a central regulator of the auxin response pathway in Arabidopsis. This complex functions as a ubiquitin protein ligase that targets members of the auxin/indoleacetic acid (Aux/IAA) family of transcriptional regulators for ubiquitin-mediated degradation in response to auxin. In an attempt to identify additional factors required for SCFTIR1 activity, we conducted a genetic screen to isolate enhancers of the auxin response defect conferred by the tir1-1 mutation. Here, we report the identification and characterization of the eta3 mutant. The eta3 mutation interacts synergistically with tir1-1 to strongly enhance all aspects of the tir1 mutant phenotype, including auxin inhibition of root growth, lateral root development, hypocotyl elongation at high temperature, and apical dominance. We isolated the ETA3 gene using a map-based cloning strategy and determined that ETA3 encodes SGT1b. SGT1b was identified recently as a factor involved in plant disease resistance signaling, and SGT1 from barley and tobacco extracts was shown to interact with SCF ubiquitin ligases. We conclude that ETA3/SGT1b is required for the SCFTIR1-mediated degradation of Aux/IAA proteins.




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