Molecule of the Month: Opioid Receptors
Morphine and other opioid drugs bind to receptors in the nervous system, controlling pain
Pathways of Pain
Stopping the Signal
Exploring the Structure
Several types of opioid receptors are made in our nervous system to manage the many shades of pain signaling. There are three general classes of opioid receptors, termed mu, kappa, delta, and a related nociceptin opioid (NOP) receptor. Atomic structures have been determined for examples from each of these classes, in PDB entries 4dkl, 4djh, 4ej4, and 4ea3). To explore these structures in more detail, click on the image for an interactive JSmol.
Topics for Further Discussion
- Scientists have designed proteins to bind to opioid drugs, for use in drug testing and in treatment of addiction. You can see the structure in PDB entry 5tzo.
- The mu opioid receptor shown above forms a dimer in the crystal, but the functional role of dimerization GPCRs is still being debated. Try looking in the PDB archive for other GPCRs that form dimers.
Related PDB-101 Resources
- Browse Drug Action
- Browse Cellular Signaling
- Browse You and Your Health
- Browse Drugs and the Brain
- JV Pergolizzi, JA LeQuang, GK Berger & RB Radda (2017) The basic pharmacology of opioids informs the opioid discourse about misuse and abuse: a review. Pain Therapy 6, 1-16.
- 5e33: P Kumar, V Reithofer, M Reisinger, S Wallner, T Pavkov-Keller, P Macheroux & K Gruber (2016) Substrate complexes of human dipeptidyl peptidase III reveal the mechanism of enzyme inhibition. Scientific Reports 6, 23787.
- C Stein (2016) Opioid receptors. Annual Review of Medicine 67, 433-451.
- Y Shang & M Filizola (2015) Opioid receptors: structural and mechanistic insights into pharmacology and signaling. European Journal of Pharmacology 763, 206-213.
- 3fvy: GA Bezerra, E Dobrovetsky, R Viertlmayr, A Dong, A Binter, M Abramic, P Macheroux, S Dhe-Paganon & K Gruber. Entropy-driven binding of opioid peptides induces a large domain motion in human dipeptidyl peptidase III. Proceedings of the National Academy of Science USA 109, 6525-66530.
- 4ej4: S Granier, A Manglik, AC Kruse, TS Kobilka, FS Thian, WI Weis & BK Kobilka (2012) Structure of the delta opioid receptor bound to naltrinodole. Nature 485, 400-404.
- 4dkl: A Manglik, AC Kruse, TS Kobilka, FS Thian, JM Mathiesen, RK Sunahara, L Pardo, WI Weis, BK Kobilka & S Granier (2012) Crystal structure of the mu-opioid receptor bound to a morphinan antagonist. Nature 485, 321-326.
- 4ea3: AA Thompson, W Liu, E Chun, V Katritch, H Wu, E Vardy, XP Huang, C Trapella, R Guerrini, G Calo, BL Roth, V Cherezov & RC Stevens (2012) Structure of the N/OFQ opioid receptor in complex with a peptide mimetic. Nature 485, 395-399.
- 4djh: H Wu, D Wacker, M Mileni, V Katritch, GW Han, E Vardy, W Liu, AA Thompson, XP Huang, FI Carroll, SW Mascarella, RB Westkaemper, PD Mosier, BL Roth, V Cherezov & RC Stevens (2012) Structure of the human kappa opioid receptor in complex with JDTic. Nature 485, 327-332.
January 2018, David Goodselldoi:10.2210/rcsb_pdb/mom_2018_1