lmmol · Proteins

Neuronal acetylcholine receptor subunit beta-2

UniProt P17787 Organism Homo sapiens Gene CHRNB2

Also known as: CHRNB2

Function

Component of neuronal acetylcholine receptors (nAChRs) that function as pentameric, ligand-gated cation channels with high calcium permeability among other activities. nAChRs are excitatory neurotrasnmitter receptors formed by a collection of nAChR subunits known to mediate synaptic transmission in the nervous system and the neuromuscular junction. Each nAchR subunit confers differential attributes to channel properties, including activation, deactivation and desensitization kinetics, pH sensitivity, cation permeability, and binding to allosteric modulators. CHRNB2 forms heteropentameric neuronal acetylcholine receptors with CHRNA2, CHRNA3, CHRNA4 and CHRNA6, as well as CHRNA5 and CHRNB3 as accesory subunits. Found in two major stoichiometric forms,(CHRNA4)3:(CHRNB2)2 and (CHRNA4)2:(CHRNB2)3, the two stoichiometric forms differ in their unitary conductance, calcium permeability, ACh sensitivity and potentiation by divalent cation. Heteropentameric channels with CHRNA6 and CHRNA4 exhibit high sensitivity to ACh and nicotine and are predominantly expressed in only a few brain areas, including dopaminergic neurons, norepirephrine neurons and cells of the visual system. nAChrs containing CHRNA6 subunits mediate endogenous cholinergic modulation of dopamine and gamma-aminobutyric acid (GABA) release in response to nicotine at nerve terminals (By similarity). Also forms functional nAChRs with other subunits such as CHRNA7:CHRNB2, mainly expressed in basal forebrain cholinergic neurons.

Classification

Family (Pfam)
PF02931 Neur_chan_LBD, PF02932 Neur_chan_memb
InterPro
Neur_chan_lig-bd, Neur_chan_lig-bd_sf, Neur_channel, Neuro-gated_channel_TM_sf, Neuro_actylchol_rec, Neurotrans-gated_channel_TM, Neurotransmitter_ion_chnl_CS, Nicotinic_acetylcholine_rcpt
Functional cluster
Cytochrome P450 & Heme Enzymes

Experimental structures · PDB · 15

A predicted model is available from AlphaFold.

Gene Ontology · 55

Disease associations

Drugs targeting this protein · 15

Related proteins · sequence + function similarity

Co-cited proteins · studied together in the literature

Literature · 26 cited papers

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