Reference: Huang N, et al. (1998) Two distinct nuclear receptor interaction domains in NSD1, a novel SET protein that exhibits characteristics of both corepressors and coactivators. EMBO J 17(12):3398-412

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Abstract


NSD1, a novel 2588 amino acid mouse nuclear protein that interacts directly with the ligand-binding domain (LBD) of several nuclear receptors (NRs), has been identified and characterized. NSD1 contains a SET domain and multiple PHD fingers. In addition to these conserved domains found in both positive and negative Drosophila chromosomal regulators, NSD1 contains two distinct NR interaction domains, NID-L and NID+L, that exhibit binding properties of NIDs found in NR corepressors and coactivators, respectively. NID-L, but not NID+L, interacts with the unliganded LBDs of retinoic acid receptors (RAR) and thyroid hormone receptors (TR), and this interaction is severely impaired by mutations in the LBD alpha-helix 1 that prevent binding of corepressors and transcriptional silencing by apo-NRs. NID+L, but not NID-L, interacts with the liganded LBDs of RAR, TR, retinoid X receptor (RXR), and estrogen receptor (ER), and this interaction is abrogated by mutations in the LBD alpha-helix 12 that prevent binding of coactivators of the ligand-induced transcriptional activation function AF-2. A novel variant (FxxLL) of the NR box motif (LxxLL) is present in NID+L and is required for the binding of NSD1 to holo-LBDs. Interestingly, NSD1 contains separate repression and activation domains. Thus, NSD1 may define a novel class of bifunctional transcriptional intermediary factors playing distinct roles in both the presence and absence of ligand.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Huang N, vom Baur E, Garnier JM, Lerouge T, Vonesch JL, Lutz Y, Chambon P, Losson R
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