PIAS1 SUMOylates THRB with SUMO1 at lysine-50, lysine-146, and lysine-443 (Liu et al. 2012). SUMOylation is required for induction of gene expression in response to ligand (triiodothyroxine). In the absence of SUMOylation the repressor NCOR is not dismissed in response to ligand binding.
Schultz, JJ, Liu, YY, Kogai, T, Mody, K, Brent, GA
SUMO transferase activity of PIAS1 [nucleoplasm]
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