Whereas the voltage-gated ion channels underlying the action potential typically allow only one type of ion to permeate, channels activated by extracellular ligands are usually less selective, allowing two or more types of ions to pass through the channel pore[1]. In most cases, these ligand gated ion channels have allosteric binding sites, and can be regulated by endogenous chemical signals originating from neurotransmitters and/or cytoplasmic modulators. Ligand gated ions channels (LGICs) can be classified in three superfamilies. The superfamily of Cys-loop receptors resembles the structure and mechanism of the nicotinic acetylcholine receptors, and all share a characteristic loop formed by a disulfide bond between two cysteine residues in the N terminal extracellular domain. Most conspicuously, all the receptors of this superfamily possess four hydrophobic amino-acid sequences, which are long enough to span the plasma membrane. Accordingly, they sometimes are termed four-transmembrane (4TM)-sequence receptors. This first class of LGICs includes both anionic receptors (glycine (GlyR), GABAA (GABAAR), as well as cationic receptors (nicotinic acetylcholine (nAChR), Zinc-activated ion channel (ZAC), and one class of serotonin receptors (5-HT3)). Secondly, the superfamily of ionotropic glutamate receptors (iGluR) share the feature of being activated by the neurotransmitter glutamate. They form tetramers with each subunit consisting of three domains. The one domain consisting of three transmembrane helices (TMD) actually forms the ions channel. The members of this superfamily are AMPA (GluA), Kainate (GluK), NMDA (GluN), and orphan (GluD) receptors. Finally, the third superfamily of LGICs is represented by a class of ATP-gated channels. The only members known to date are the P2X receptors (P2X 1-7) which form trimers with only two transmembrane helices per subunit[2].

[1] Neuroscience. 2nd edition. Purves D, Augustine GJ, Fitzpatrick D, et al., editors.Sunderland (MA): Sinauer Associates; 2001
[2] Ligand-Gated Ion Channels. F. Hucho, C. Weise. Angew.Chem.Int.Ed. 2001, 40, 3100-3116.

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Axon ID Name Description From price
2534 (+)-Azasetron hydrochloride 5-HT3 antagonist €135.00
1077 (+)-Epibatidine dihydrochloride Nicotinic acetylcholine receptor agonist €155.00
1594 (+)-Pagoclone GABAA-α2 and GABAA-α3 agonist €135.00
2535 (-)-Azasetron hydrochloride 5-HT3 antagonist €135.00
1078 (-)-Epibatidine dihydrochloride Nicotinic acetylcholine receptor agonist €155.00
2784 (R)-(-)-N-Desmethyl-PK 11195 Radioligand precursor of the benzodiazepine antagonist (R)-(-)-PK 11195 €150.00
2785 (R)-(-)-PK 11195 Benzodiazepine antagonist. €130.00
1076 (±)-Epibatidine dihydrochloride Nicotinic acetylcholine receptor agonist €95.00
3088 1-BCP Brain-penetrant modulator of AMPA receptor €75.00
2694 4BP-TQS Allosteric agonist of α7 nAChR €110.00
2182 A 804598 Potent and selective P2X7 antagonist €125.00
3835 A-438079 hydrochloride Competitive P2X7 antagonist €110.00
3698 AC-5216 Selective translocator protein (TSPO) ligand €90.00
2552 Adjudin Non-hormonal male contraceptive with anti-proliferative activity €125.00
1097 Alosetron hydrochloride 5-HT3 antagonist €85.00
3415 AMPA Highly selective AMPA receptor agonist €110.00
2401 AT 1001 High affinity and selective α3β4 nAChR ligand with partial agonistic and antagonistic effects €95.00
4049 Ataluren CFTR-G542X suppressor €110.00
1096 Azasetron hydrochloride 5-HT3 antagonist €90.00
3042 AZD6280 Selective, orally active, allosteric GABA-A α2/3 receptor modulator €125.00
3335 AZD6765 dihydrochloride Noncompetitive NMDA antagonist €90.00
3087 AZD7325 Potent, selective GABAA-α2 and GABAA-α3 modulator €90.00
1153 B-HT 920 dihydrochloride D2 agonist, α2 adrenoceptor agonist; 5-HT3 antagonist €80.00
3845 BAY-1797 Potent and selective P2X4 inhibitor €130.00
2523 BX 430 Allosteric antagonist of human P2X4 receptor channels €105.00
1217 CFM 2 AMPA antagonist €115.00
4169 CIQ First NMDA NR2C/NR2D PAM €130.00
2079 CMPDA Positive allosteric modulator of AMPA receptor €85.00
1200 CNQX AMPA/Kainate antagonist €85.00
2522 CNQX disodium salt AMPA/Kainate antagonist €90.00

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