Journal
PLANT CELL
Volume 14, Issue 2, Pages 421-433Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.010282
Keywords
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Funding
- NIGMS NIH HHS [R01-GM43644, R01 GM043644] Funding Source: Medline
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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 AtCULl affects the function of SCF E3s that are required for auxin response.
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