The Plant Cell, Vol. 14, 1919-1935,
August 2002, Copyright © 2002,
American Society of Plant Biologists
The SCFCOI1 Ubiquitin-Ligase Complexes Are Required for Jasmonate Response in Arabidopsis
Linghui Xu1,a,b,
Fuquan Liu1,b,
Esther Lechnerc,
Pascal Genschikc,
William L. Crosbyd,
Hong Mae,
Wen Pengb,
Dafang Huanga and
Daoxin Xie2,3,b
a Institute of Biotechnology Research, Chinese Academy of Agricultural Sciences, Beijing 100081, China
b Institute of Molecular Agrobiology, 1 Research Link, National University of Singapore, 117604, Republic of Singapore
c Institut de Biologie Moléculaire des Plantes du Centre National de la Recherche Scientifique, 12 Rue du Général Zimmer, 67084 Strasbourg Cédex, France
d Plant Biotechnology Institute, National Research Council, Saskatoon SK S7N-0W9, Canada
e Department of Biology and the Life Sciences Consortium, Pennsylvania State University, University Park, Pennsylvania 16802
3 To whom correspondence should be addressed. E-mail daoxin{at}imcb.a-star.edu.sg; fax 65-68727517
Xie and colleagues previously isolated the Arabidopsis COI1 gene that is required for response to jasmonates (JAs), which regulate root growth, pollen fertility, wound healing, and defense against insects and pathogens. In this study, we demonstrate that COI1 associates physically with AtCUL1, AtRbx1, and either of the Arabidopsis Skp1-like proteins ASK1 or ASK2 to assemble ubiquitin-ligase complexes, which we have designated SCFCOI1. COI1E22A, a single amino acid substitution in the F-box motif of COI1, abolishes the formation of the SCFCOI1 complexes and results in loss of the JA response. AtRbx1 double-stranded RNA-mediated genetic interference reduces AtRbx1 expression and affects JA-inducible gene expression. Furthermore, we show that the AtCUL1 component of SCFCOI1 complexes is modified in planta, where mutations in AXR1 decrease the abundance of the modified AtCUL1 of SCFCOI1 and lead to a reduction in JA response. Finally, we demonstrate that the axr1 and coi1 mutations display a synergistic genetic interaction in the double mutant. These results suggest that the COI1-mediated JA response is dependent on the SCFCOI1 complexes in Arabidopsis and that the AXR1-dependent modification of the AtCUL1 subunit of SCFCOI1 complexes is important for JA signaling.
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