Ligand-binding pocket shape differences between sphingosine 1-phosphate (S1P) receptors S1P1 and S1P3 determine efficiency of chemical probe identification by ultrahigh-throughput screening.
We have studied the sphingosine 1-phosphate (S1P) receptor system to better understand why certain molecular targets within a closely related family are much more tractable when identifying compelling chemical leads. Five medically important G-protein-coupled receptors for S1P regulate heart rate, coronary artery caliber, endothelial barrier integrity, and lymphocyte trafficking. Selective S1P receptor agonist probes would be of great utility to study receptor subtype-specific function. Through systematic screening of the same libraries, we identified novel selective agonist chemotypes for each of the S1P1 and S1P3 receptors. Ultrahigh-throughput screening (uHTS) for S1P1 was more effective than that for S1P3, with many selective, low nanomolar hits of proven mechanism emerging. Receptor structure modeling and ligand docking reveal differences between the receptor binding pockets, which are the basis for subtype selectivity. Novel selective agonists interact primarily in the hydrophobic pocket of the receptor in the absence of headgroup interactions. Chemistry-space and shape-based analysis of the screening libraries in combination with the binding models explain the observed differential hit rates and enhanced efficiency for lead discovery for S1P1 versus S1P3 in this closely related receptor family.
Schürer
Stephan C
SC
Department of Scientific Computing, The Scripps Research Institute, La Jolla, California and Jupiter, Florida, USA.
Brown
Steven J
SJ
Gonzalez-Cabrera
Pedro J
PJ
Schaeffer
Marie-Therese
MT
Chapman
Jacqueline
J
Jo
Euijung
E
Chase
Peter
P
Spicer
Tim
T
Hodder
Peter
P
Rosen
Hugh
H
D000818:Animals; D001665:Binding Sites; D015374:Biosensing Techniques / Q000379:methods*; D016466:CHO Cells; D002118:Calcium / Q000378:metabolism; D016000:Cluster Analysis; D006224:Cricetinae; D003412:Cricetulus; D008024:Ligands; D008958:Models, Molecular; D015335:Molecular Probes / Q000737:chemistry* / Q000494:pharmacology; D010069:Oxadiazoles / Q000737:chemistry* / Q000494:pharmacology; D010766:Phosphorylation; D011485:Protein Binding; D011487:Protein Conformation; D049349:Receptors, Lysosphingolipid / Q000819:agonists* / Q000235:genetics; D013329:Structure-Activity Relationship
D008024:Ligands; D015335:Molecular Probes; D010069:Oxadiazoles; D049349:Receptors, Lysosphingolipid; D002118:Calcium