The quaternary architecture of RARβ–RXRα heterodimer facilitates domain–domain signal transmission
- Sanford Burnham Prebys Medical Discovery Institute, Orlando, FL (United States). Integrative Metabolism Program
- Sanford Burnham Prebys Medical Discovery Institute, Orlando, FL (United States). Integrative Metabolism Program; Shandong University (China). Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, School of Life Sciences
- University of California, San Diego, La Jolla, CA (United States). Department of Medicine and UCSD DXMS Proteomics Resource
- Argonne National Lab. (ANL), Argonne, IL (United States). Structural Biology Center, Biosciences Division
Assessing the physical connections and allosteric communications in multi-domain nuclear receptor (NR) polypeptides has remained challenging, with few crystal structures available to show their overall structural organizations. Here we report the quaternary architecture of multi-domain retinoic acid receptor beta-retinoic X receptor alpha (RAR beta-RXR alpha) heterodimer bound to DNA, ligands and coactivator peptides, examined through crystallographic, hydrogen-deuterium exchange mass spectrometry, mutagenesis and functional studies. The RAR beta ligand-binding domain (LBD) and DNA-binding domain (DBD) are physically connected to foster allosteric signal transmission between them. Direct comparisons among all the multi-domain NRs studied crystallographically to date show significant variations within their quaternary architectures, rather than a common architecture adhering to strict rules. RXR remains flexible and adaptive by maintaining loosely organized domains, while its hetero-dimerization partners use a surface patch on their LBDs to form domain-domain interactions with DBDs.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1422588
- Journal Information:
- Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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