RT Journal Article
SR Electronic
T1 Regulation of Brassinosteroid Signaling by a GSK3/SHAGGY-Like Kinase
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1299
OP 1301
DO 10.1126/science.1065769
VO 295
IS 5558
A1 Li, Jianming
A1 Nam, Kyoung Hee
YR 2002
UL http://science.sciencemag.org/content/295/5558/1299.abstract
AB GSK3/SHAGGY is a highly conserved serine/threonine kinase implicated in many signaling pathways in eukaryotes. Although many GSK3/SHAGGY-like kinases have been identified in plants, little is known about their functions in plant growth and development. Here we show that the Arabidopsis BRASSINOSTEROID-INSENSITIVE 2(BIN2) gene encodes a GSK3/SHAGGY-like kinase. Gain-of-function mutations within its coding sequence or its overexpression inhibit brassinosteroid (BR) signaling, resulting in plants that resemble BR-deficient and BR-response mutants. In contrast, reduced BIN2 expression via cosuppression partially rescues a weak BR-signaling mutation. Thus, BIN2 acts as a negative regulator to control steroid signaling in plants.