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Plant Physiol, August 2000, Vol. 123, pp. 1247-1256
Brassinosteroid-Insensitive-1 Is a Ubiquitously Expressed
Leucine-Rich Repeat Receptor Serine/Threonine Kinase1
Danielle M.
Friedrichsen,2
Claudio A.P.
Joazeiro,2
Jianming
Li,23
Tony
Hunter, and
Joanne
Chory*
Plant Biology Laboratory (D.M.F., J.L., J.C.), Molecular Biology
and Virology Laboratory (C.A.P.J., T.H.), and Howard Hughes Medical
Institute (J.C.), The Salk Institute for Biological Studies, La Jolla,
California 92037; and Department of Biology, University of California
at San Diego, La Jolla, California 92037 (D.M.F.)
Brassinosteroid (BR) mutants of Arabidopsis have pleiotropic
phenotypes and provide evidence that BRs function throughout the life
of the plant from seedling development to senescence. Screens for BR
signaling mutants identified one locus, BRI1, which encodes a protein with homology to leucine-rich repeat receptor serine
(Ser)/threonine (Thr) kinases. Twenty-seven alleles of this putative BR
receptor have been isolated to date, and we present here the
identification of the molecular lesions of 14 recessive alleles that
represent five new mutations. BR-insensitive-1 (BRI1) is expressed at
high levels in the meristem, root, shoot, and hypocotyl of seedlings
and at lower levels later in development. Confocal microscopy analysis
of full-length BRI1 fused to green fluorescent protein indicates that
BRI1 is localized in the plasma membrane, and an in vitro kinase assay
indicates that BRI1 is a functional Ser/Thr kinase. Among the
bri1 mutants identified are mutants in the kinase
domain, and we demonstrate that one of these mutations severely impairs
BRI1 kinase activity. Therefore, we conclude that BRI1 is a
ubiquitously expressed leucine-rich repeat receptor that plays a role
in BR signaling through Ser/Thr phosphorylation.
1
This work was supported by grants from the U.S.
Department of Agriculture (to J.C.) and the National Institutes of
Health (to T.H.). J.C. is an associate investigator of the Howard
Hughes Medical Institute. T.H. is a Frank and Else Schilling American Cancer Society research professor. D.M.F. was partially supported by a
National Institutes of Health Training Grant. C.A.P.J. and J.L. were
American Cancer Society Postdoctoral Fellows.
2
These authors contributed equally to the paper.
3
Present address: Department of Biology, University of
Michigan, Ann Arbor, MI 48109.
*
Corresponding author; e-mail chory{at}salk.edu; fax 858-558-6379.
© 2000 American Society of Plant Physiologists
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G. J. Bishop and T. Yokota
Plants Steroid Hormones, Brassinosteroids: Current Highlights of Molecular Aspects on their Synthesis/Metabolism, Transport, Perception and Response
Plant Cell Physiol.,
February 1, 2001;
42(2):
114 - 120.
[Abstract]
[Full Text]
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R. Yamamoto, S. Fujioka, T. Demura, S. Takatsuto, S. Yoshida, and H. Fukuda
Brassinosteroid Levels Increase Drastically Prior to Morphogenesis of Tracheary Elements
Plant Physiology,
February 1, 2001;
125(2):
556 - 563.
[Abstract]
[Full Text]
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C. M. Steber and P. McCourt
A Role for Brassinosteroids in Germination in Arabidopsis
Plant Physiology,
February 1, 2001;
125(2):
763 - 769.
[Abstract]
[Full Text]
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J. Li, K. A. Lease, F. E. Tax, and J. C. Walker
BRS1, a serine carboxypeptidase, regulates BRI1 signaling in Arabidopsis thaliana
PNAS,
May 8, 2001;
98(10):
5916 - 5921.
[Abstract]
[Full Text]
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