Brassinosteroid signal transduction: clarifying the pathway from ligand perception to gene expression.

Recent genetic screens for novel components of brassinosteroid signaling have revealed proteins with cell surface, cytoplasmic, and nuclear localization that function as either positive activators or negative regulators of the brassinosteroid response. Initial microarray experiments have expanded the number of known brassinosteroid-regulated genes, providing a useful resource for better understanding terminal events in signal transduction.