Comparison of Orexin 1 and Orexin 2 Ligand Binding Modes Using X-ray Crystallography and Computational Analysis.Rappas, M., Ali, A.A.E., Bennett, K.A., Brown, J.D., Bucknell, S.J., Congreve, M., Cooke, R.M., Cseke, G., de Graaf, C., Dore, A.S., Errey, J.C., Jazayeri, A., Marshall, F.H., Mason, J.S., Mould, R., Patel, J.C., Tehan, B.G., Weir, M., Christopher, J.A.
(2020) J.Med.Chem. 63: 1528-1543
- PubMed: 31860301
- DOI: 10.1021/acs.jmedchem.9b01787
- Primary Citation of Related Structures:
- PubMed Abstract:
The orexin system, which consists of the two G protein-coupled receptors OX <sub>1 </sub> and OX <sub>2 </sub>, activated by the neuropeptides OX-A and OX-B, is firmly established as a key regulator of behavioural arousal, sleep and wakefulness, and ...
The orexin system, which consists of the two G protein-coupled receptors OX 1 and OX 2 , activated by the neuropeptides OX-A and OX-B, is firmly established as a key regulator of behavioural arousal, sleep and wakefulness, and has been an area of intense research effort over the past two decades. X-ray structures of the receptors in complex with ten new antagonist ligands from diverse chemotypes are presented, which complement the existing structural information for the system and highlight the critical importance of lipophilic hotspots and water molecules for these peptidergic GPCR targets. Learnings from the structural information regarding the utility of pharmacophore models and how selectivity between OX 1 and OX 2 can be achieved are discussed.