Fig. 4.
Ubiquitinated Rheb promotes its interaction with TSC. a Co-IP assay was performed to analyze the binding of TSC2 to different forms of Rheb mutants (active form: S16H; inactive form: D60V, D60K, S20N). b TSC2 purified from HEK293T cells showed stronger binding affinity to the ubiquitinated Rheb. c Rheb-K8R mutant showed weaker binding affinity to TSC2 as compared with Rheb-WT. d, e RNF152 Knockdown (d) or knockout (e) reduced the binding bewteen Rheb and TSC2. The knockdown efficiency was detected by RT-PCR in Supplementary information, Fig. S2e. RNF152-KO MEF cells were analyzed via genomic DNA PCR in Supplementary information, Fig. S3s. f–h USP4 knockdown (f), knockout (g) or inactivation of USP4 by Vialinin A (h) promoted the binding of Rheb to TSC2