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Mol. Cell. Biol., 01 1995, 255-263, Vol 15, No. 1
Copyright © 1995, American Society for Microbiology

Mouse retinoid X receptor contains a separable ligand-binding and transactivation domain in its E region

X Leng, J Blanco, SY Tsai, K Ozato, BW O'Malley and MJ Tsai
Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030.

Steroid, thyroid, and retinoid hormones exert their biological functions by interacting with their cognate nuclear receptors. Upon binding receptors, hormones induce a protease-resistant structural change in the receptor ligand-binding domain and subsequently activate the receptors. Utilizing partial proteolysis, we have been able to delineate a region in the mouse retinoid X receptor beta (mRXR beta) required for ligand binding. A separable activation domain within the mRXR beta E region has been identified. The activation domain, which is 21 amino acids in length, is located at the extreme C terminus of mRXR beta. This domain is not required for ligand binding since removal of this sequence neither eliminates the ligand-induced, protease-resistant conformational change nor alters the ligand-enhanced DNA binding. Furthermore, deletion of this activation domain converts the receptor into a transcriptional silencer. Finally, a further truncation of 9 amino acids (for a total of 30 amino acids) from the C terminus results in a mutant which does not undergo the protease-resistant conformational change and cannot bind DNA as a homodimer. Nevertheless, this mutant is still able to form a heterodimer with the thyroid hormone receptor. Therefore, homodimerization and heterodimerization can be distinguished by this nine-amino-acid sequence.


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