Abstract
Nuclear receptors are ligand dependent transcription factors that control gene expression by coordinating protein assemblies. Their modular organization confers the necessary flexibility to adapt their conformation to multiple different partners. They either function as homo or heterodimers with a common partner (RXR in vertebrates). The present chapter deals with the large subgroup of heterodimers for which seven solution structures and two crystal structures of DNA bound receptors are presently available. The results show the molecular architecture of the complexes and illustrate the adaptability of the receptors while revealing some common features like their L-shape open conformation with an asymmetric position of the ligand binding domains. The structural data enlighten the important role of the promoter and the protein hinges into the spatial organization of the DNA and ligand binding domains. They explain how DNA dictates the topology of the complex and its asymmetry, thus remodeling the interaction surfaces according to the different response elements. The structural investigations provide additional information related to the dynamics of the regulation process like the solution structure of the free RARα/RXRα heterodimer, the binding mode of protein cofactors and the stoichiometry of the resulting complexes.
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Beinsteiner, B., Moras, D. (2015). Structural Analysis of Heterodimeric Nuclear Receptors. In: McEwan, I., Kumar, R. (eds) Nuclear Receptors: From Structure to the Clinic. Springer, Cham. https://doi.org/10.1007/978-3-319-18729-7_7
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DOI: https://doi.org/10.1007/978-3-319-18729-7_7
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