First published online May 25, 2004; 10.1105/tpc.021386
The Plant Cell 16:1406-1418 (2004)
© 2004 American Society of Plant Biologists
The Arabidopsis Mutant sleepy1gar2-1 Protein Promotes Plant Growth by Increasing the Affinity of the SCFSLY1 E3 Ubiquitin Ligase for DELLA Protein Substrates
Xiangdong Fua,
Donald E. Richardsa,
Barbara Flecka,1,
Daoxin Xieb,
Nicolas Burtona and
Nicholas P. Harberda,2
a John Innes Centre, Norwich NR4 7UH, United Kingdom
b Institute of Molecular and Cell Biology, Singapore 117609
2 To whom correspondence should be addressed. E-mail nicholas.harberd{at}bbsrc.ac.uk; fax 44 1603 450025.
DELLA proteins restrain the cell proliferation and enlargement that characterizes the growth of plant organs. Gibberellin stimulates growth via 26S proteasomedependent destruction of DELLAs, thus relieving DELLA-mediated growth restraint. Here, we show that the Arabidopsis thaliana sleepy1gar2-1 (sly1gar2-1) mutant allele encodes a mutant subunit (sly1gar2-1) of an SCFSLY1 E3 ubiquitin ligase complex. SLY1 (the wild-type form) and sly1gar2-1 both confer substrate specificity on this complex via specific binding to the DELLA proteins. However, sly1gar2-1 interacts more strongly with the DELLA target than does SLY1. In addition, the strength of the SCFSLY1DELLA interaction is increased by target phosphorylation. Growth-promoting DELLA destruction is dependent on SLY1 availability, on the strength of the interaction between SLY1 and the DELLA target, and on promotion of the SCFSLY1DELLA interaction by DELLA phosphorylation.
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