FIGURE 4.

Proposed model for the strigolactone-induced dynamics of the SMXL7/ΔSMXL7 protein complex. In the presence of strigolactone, D14 and SCF^MAX2 are recruited to SMXL7, whereas the TPL/TPR proteins dissociate from the complex. Subsequent ubiquitination of SMXL7 and its degradation by the 26S proteasome releases the repression of downstream responses. On the contrary, the ΔSMXL7-TPL/TPR interaction does not allow binding of the rac-GR24-bound D14 to ΔSMXL7, preventing the protein from degradation and activation of downstream responses.