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The Plant Cell, Vol. 14, 421-433, February 2002, Copyright © 2002,
American Society of Plant Biologists

AXR1-ECR1–Dependent Conjugation of RUB1 to the Arabidopsis Cullin AtCUL1 Is Required for Auxin Response

Juan C. del Pozo1,2,, Sunethra Dharmasiri1, Hanjo Hellmann, Loni Walker3, William M. Gray and Mark Estelle4

Molecular Cell and Developmental Biology, Institute for Cellular and Molecular Biology, University of Texas at Austin, Texas 78712

4 To whom correspondence should be addressed. E-mail mestelle{at}mail.utexas.edu; fax 512-232-3432

Mutations in the AXR1 gene result in a reduction in auxin response and diverse defects in auxin-regulated growth and development. In a previous study, we showed that AXR1 forms a heterodimer with the ECR1 protein. This enzyme activates the ubiquitin-related protein RUB1 in vitro. Furthermore, we showed that the Skp1-Cul1/Cdc53-F-box (SCF) subunit AtCUL1 is modified by RUB1 in vivo. In this report, we demonstrate that the formation of RUB-AtCUL1 is dependent on AXR1 and ECR1 in vivo. The expression of AXR1 and ECR1 is restricted to zones of active cell division and cell elongation, consistent with their role in growth regulation. These results provide strong support for a model in which RUB conjugation of AtCUL1 affects the function of SCF E3s that are required for auxin response.




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