Probable component of a transcriptional corepressor complex involved in branching control. Regulates cotyledon expansion and lateral root growth, but not germination or hypocotyl elongation. Promotes auxin transport and PIN1 accumulation in the stem and represses BRC1/TCP18 expression in axillary buds (PubMed:26546447, PubMed:26546446). Interacts with TPL/TPR in an EAR-motif dependent manner (PubMed:26546447). Interacts with TPL, TPR1, TPR2 and TPR4 (PubMed:26546447). Interacts with MAX2 and TPR2 (PubMed:26546446). Interacts with D14 (PubMed:26546446, PubMed:25713176). The interaction with D14 occurs in the presence of (2'R) stereoisomers of strigolactones, but not (2'S) stereoisomers (PubMed:25713176). Expressed in axillary branches and roots. Detected in seedlings and leaves (PubMed:23893171). Expressed in the primary rosette buds and expanding leaves of adult rosettes, the vasculature of the hypocotyls, cotyledons, and mature roots, and in the midvein and petioles of young leaves (PubMed:26546447). Up-regulated by strigolactone treatment. Contains 1 EAR motif required for the interaction with TPR2. Ubiquitinated upon strigolactone treatment. Strigolactone, but not karrikin, triggers rapid SCF(MAX2)-dependent degradation (PubMed:26546447, PubMed:26546446). No visible phenotype. Suppresses max2 phenotypes associated with strigolactone-D14-regulated growth. Smxl7 and max2 double mutants have reduced branching and increased inflorescence heights compared with max2 mutants. Belongs to the ClpA/ClpB family.