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. 1995 Dec 14;378(6558):681-9.
doi: 10.1038/378681a0.

Crystal structure of the RAR-gamma ligand-binding domain bound to all-trans retinoic acid

J P Renaud  1 , N Rochel, M Ruff, V Vivat, P Chambon, H Gronemeyer, D Moras
Affiliations

Crystal structure of the RAR-gamma ligand-binding domain bound to all-trans retinoic acid

J P Renaud et al. Nature. .

Abstract

The 2.0-A crystal structure of the ligand-binding domain (LBD) of the human retinoic acid receptor (RAR)-gamma bound to all-trans retinoic acid reveals the ligand-binding interactions and suggests an electrostatic guidance mechanism. The overall fold is similar to that of the human RXR-alpha apo-LBD, except for the carboxy-terminal part which folds back towards the LBD core, contributing to the hydrophobic ligand pocket and 'sealing' its entry site. We propose a 'mouse trap' mechanism whereby a ligand-induced conformational transition repositions the amphipathic alpha-helix of the AF-2 activating domain and forms a transcriptionally active receptor.

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