FBXL16 does not compete with FBW7 for c-myc binding.
A, 293T cells were co-transfected with pSG5-FLAG-FBXL16 and either WT, T58/S62AA, T58A, or S62A of HA-tagged c-myc constructs. FLAG-FBXL16 was immunoprecipitated using anti–FLAG-Ab conjugated agarose beads (FLAG-IP), and then Western blot analysis was performed to examine the interactions of FBXL16 with different HA-tagged c-myc protein. B, HA-tagged FBW7 was co-overexpressed with either an empty plasmid or pSG5-FLAG-FBXL16 in 293T cells. HA-FBW7 was then immunoprecipitated using anti–HA-Ab conjugated agarose beads (HA-FBW7 IP). Western blot analysis was then performed to examine the interactions of FBW7 with c-myc.