Abstract
Biased agonism at G protein-coupled receptors (GPCRs) has significant implications for current drug discovery, but molecular determinants that govern ligand bias remain largely unknown. The adenosine A3 GPCR (A3AR) is a potential therapeutic target for various conditions, including cancer, inflammation, and ischemia, but for which biased agonism remains largely unexplored. We now report the generation of bias "fingerprints" for prototypical ribose containing A3AR agonists and rigidified (N)-methanocarba 59-N-methyluronamide nucleoside derivatives with regard to their ability to mediate different signaling pathways. Relative to the reference prototypical agonist IB-MECA, (N)-methanocarba 59-Nmethyluronamide nucleoside derivatives with significant N6 or C2 modifications, including elongated aryl-ethynyl groups, exhibited biased agonism. Significant positive correlation was observed between the C2 substituent length (in Å) and bias toward cell survival. Molecular modeling suggests that extended C2 substituents on (N)-methanocarba 59-N-methyluronamide nucleosides promote a progressive outward shift of the A3AR transmembrane domain 2, which may contribute to the subset of A3AR conformations stabilized on biased agonist binding.
| Original language | English |
|---|---|
| Pages (from-to) | 12-22 |
| Number of pages | 11 |
| Journal | Molecular Pharmacology |
| Volume | 90 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jul 2016 |
Cite this
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Structure-activity analysis of biased agonism at the human adenosine A3 receptor. / Baltos, Jo-Anne; Paoletta, Silvia; Nguyen, Anh T. N.; Gregory, Karen J.; Tosh, Dilip K.; Christopoulos, Arthur; Jacobson, Kenneth A.; May, Lauren T.
In: Molecular Pharmacology, Vol. 90, No. 1, 01.07.2016, p. 12-22.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Structure-activity analysis of biased agonism at the human adenosine A3 receptor
AU - Baltos, Jo-Anne
AU - Paoletta, Silvia
AU - Nguyen, Anh T. N.
AU - Gregory, Karen J.
AU - Tosh, Dilip K.
AU - Christopoulos, Arthur
AU - Jacobson, Kenneth A.
AU - May, Lauren T.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - Biased agonism at G protein-coupled receptors (GPCRs) has significant implications for current drug discovery, but molecular determinants that govern ligand bias remain largely unknown. The adenosine A3 GPCR (A3AR) is a potential therapeutic target for various conditions, including cancer, inflammation, and ischemia, but for which biased agonism remains largely unexplored. We now report the generation of bias "fingerprints" for prototypical ribose containing A3AR agonists and rigidified (N)-methanocarba 59-N-methyluronamide nucleoside derivatives with regard to their ability to mediate different signaling pathways. Relative to the reference prototypical agonist IB-MECA, (N)-methanocarba 59-Nmethyluronamide nucleoside derivatives with significant N6 or C2 modifications, including elongated aryl-ethynyl groups, exhibited biased agonism. Significant positive correlation was observed between the C2 substituent length (in Å) and bias toward cell survival. Molecular modeling suggests that extended C2 substituents on (N)-methanocarba 59-N-methyluronamide nucleosides promote a progressive outward shift of the A3AR transmembrane domain 2, which may contribute to the subset of A3AR conformations stabilized on biased agonist binding.
AB - Biased agonism at G protein-coupled receptors (GPCRs) has significant implications for current drug discovery, but molecular determinants that govern ligand bias remain largely unknown. The adenosine A3 GPCR (A3AR) is a potential therapeutic target for various conditions, including cancer, inflammation, and ischemia, but for which biased agonism remains largely unexplored. We now report the generation of bias "fingerprints" for prototypical ribose containing A3AR agonists and rigidified (N)-methanocarba 59-N-methyluronamide nucleoside derivatives with regard to their ability to mediate different signaling pathways. Relative to the reference prototypical agonist IB-MECA, (N)-methanocarba 59-Nmethyluronamide nucleoside derivatives with significant N6 or C2 modifications, including elongated aryl-ethynyl groups, exhibited biased agonism. Significant positive correlation was observed between the C2 substituent length (in Å) and bias toward cell survival. Molecular modeling suggests that extended C2 substituents on (N)-methanocarba 59-N-methyluronamide nucleosides promote a progressive outward shift of the A3AR transmembrane domain 2, which may contribute to the subset of A3AR conformations stabilized on biased agonist binding.
UR - http://www.scopus.com/inward/record.url?scp=84976440477&partnerID=8YFLogxK
U2 - 10.1124/mol.116.103283
DO - 10.1124/mol.116.103283
M3 - Article
VL - 90
SP - 12
EP - 22
JO - Molecular Pharmacology
JF - Molecular Pharmacology
SN - 1521-0111
IS - 1
ER -