N-type calcium channel

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calcium channel, voltage-dependent, N type, alpha 1B subunit
Identifiers
Symbol CACNA1B
Alt. Symbols CACNL1A5
Entrez 774
HUGO 1389
OMIM 601012
RefSeq NM_000718
UniProt Q00975
Other data
Locus Chr. 9 q34
Illustration of the major elements in a prototypical synapse. Synapses allow nerve cells to communicate with one another through axons and dendrites, converting electrical impulses into chemical signals.
Illustration of the major elements in a prototypical synapse. Synapses allow nerve cells to communicate with one another through axons and dendrites, converting electrical impulses into chemical signals.
Neuron A (transmitting) to neuron B (receiving)1. Mitochondrion 2. Synaptic vesicle with neurotransmitters 3. Autoreceptor4. Synapse with neurotransmitter released (serotonin) 5. Postsynaptic receptors activated by neuro-transmitter (induction of a postsynaptic potential) 6. Calcium channel7. Exocytosis of a vesicle8. Recaptured neurotransmitter
Neuron A (transmitting) to neuron B (receiving)
1. Mitochondrion
2. Synaptic vesicle with neurotransmitters
3. Autoreceptor
4. Synapse with neurotransmitter released (serotonin)
5. Postsynaptic receptors activated by neuro-transmitter (induction of a postsynaptic potential)
6. Calcium channel
7. Exocytosis of a vesicle
8. Recaptured neurotransmitter

The N-type calcium channel is a type of voltage-dependent calcium channel. Like the others of this class, the α1 subunit is the one that determines most of the channel's properties.

N-type ('N' for "Neural-Type"[1]) calcium channels are found primarily at presynaptic terminals and are involved in neurotransmitter release. Strong depolarization by an action potential causes these channels to open and allow influx of Ca2+, initiating vesicle fusion and release of stored neurotransmitter. N-type channels are blocked by ω-conotoxin.

The analgesic drug ziconotide inhibits N-type channels.

[edit] References

  1. ^ MeSH N-Type+Calcium+Channel
v • d • e
Membrane transport protein: ion channels
Ca2+: Calcium channel
Na+: Sodium channel
Navα (1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.9, 7A) • Navβ (1, 2, 3, 4) • Epithelial sodium channel
K+: Potassium channel
Cl-: Chloride channel
Porin
Cations: TRP
TRPA (1) • TRPC (1, 2, 3, 4, 4AP, 5, 6, 7) • TRPM (1, 2, 3, 4, 5, 6, 7, 8) • TRPML (Mucolipin-1) • TRPP (1, 2) • TRPV (1, 2, 3, 4, 5, 6)
Other/general