1xap | pdb_00001xap
Structure of the ligand binding domain of the Retinoic Acid Receptor beta
Structural highlights
FunctionRARB_HUMAN Receptor for retinoic acid. Retinoic acid receptors bind as heterodimers to their target response elements in response to their ligands, all-trans or 9-cis retinoic acid, and regulate gene expression in various biological processes. The RXR/RAR heterodimers bind to the retinoic acid response elements (RARE) composed of tandem 5'-AGGTCA-3' sites known as DR1-DR5. In the absence or presence of hormone ligand, acts mainly as an activator of gene expression due to weak binding to corepressors. In concert with RARG, required for skeletal growth, matrix homeostasis and growth plate function.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe crystal structure of the ligand-binding domain of RARbeta, a suspect tumour suppressor, reveals important features that distinguish it from the two other RAR isotypes. The most striking difference is an extra cavity allowing RARbeta to bind more bulky agonists. Accordingly, we identified a ligand that shows RARbeta selectivity with a 100-fold higher affinity to RARbeta than to alpha or gamma isotypes. The structural differences between the three RAR ligand-binding pockets revealed a rationale explaining how a single retinoid can be at the same time an RARalpha, gamma antagonist and an RARbeta agonist. In addition, we demonstrate how to generate an RARbeta antagonist by gradually modifying the bulkiness of a single substitution. Together, our results provide structural guidelines for the synthesis of RARbeta-selective agonists and antagonists, allowing for the first time to address pharmacologically the tumour suppressor role of RARbeta in vitro and in animal models. Rational design of RAR-selective ligands revealed by RARbeta crystal stucture.,Germain P, Kammerer S, Perez E, Peluso-Iltis C, Tortolani D, Zusi FC, Starrett J, Lapointe P, Daris JP, Marinier A, de Lera AR, Rochel N, Gronemeyer H EMBO Rep. 2004 Sep;5(9):877-82. PMID:15319780[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
| ||||||||||||||||||||
