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. Author manuscript; available in PMC: 2015 Nov 24.
Published in final edited form as: Plant J. 2011 Apr;66(1):117–127. doi: 10.1111/j.1365-313X.2011.04518.x

Figure 4.

Figure 4

Model for brassinosteroid signaling. In the absence of signaling, BRI1 forms constitutive homodimers held inactive by BKI1 and the BRI1 autoinhibitory domain.BIN2 actively represses BES1 and BZR1 through direct phosphorylation. Binding of brassinosteroids to the BRI1 extracellular domains relieves BKI1 inhibition and allows BRI1-BAK1 interaction and sequential trans-phosphorylation. BSKs facilitate BRI1 repression of BIN2, derepressing BES1 and BZR1, allow for brassinosteroid-responsive transcriptional control. Asterisks indicate protein phosphorylation. See text for explanation and citations.