Structural basis for selectivity and diversity in angiotensin II receptors
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- Univ. of Southern California, Los Angeles, CA (United States); Zhejiang Univ., Zhejiang (China)
- Univ. of Southern California, Los Angeles, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Merck & Co., Inc., Kenilworth, NJ (United States)
- Merck & Co., Inc., West Point, PA (United States)
- Univ. of Hamburg, Hamburg (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Arizona State Univ., Tempe, AZ (United States)
- Merck & Co., Inc., North Wales, PA (United States)
The angiotensin II receptors AT1R and AT2R serve as key components of the renin–angiotensin–aldosterone system. AT1R has a central role in the regulation of blood pressure, but the function of AT2R is unclear and it has a variety of reported effects. To identify the mechanisms that underlie the differences in function and ligand selectivity between these receptors, here we report crystal structures of human AT2R bound to an AT2R-selective ligand and to an AT1R/AT2R dual ligand, capturing the receptor in an active-like conformation. Unexpectedly, helix VIII was found in a non-canonical position, stabilizing the active-like state, but at the same time preventing the recruitment of G proteins or β-arrestins, in agreement with the lack of signalling responses in standard cellular assays. Structure–activity relationship, docking and mutagenesis studies revealed the crucial interactions for ligand binding and selectivity. Finally, our results thus provide insights into the structural basis of the distinct functions of the angiotensin receptors, and may guide the design of new selective ligands.
- Research Organization:
- SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1361139
- Alternate ID(s):
- OSTI ID: 1368259
- Journal Information:
- Nature (London), Journal Name: Nature (London) Journal Issue: 7650 Vol. 544; ISSN 0028-0836
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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