• response to organic cyclic compound • protein heterooligomerization • regulation of insulin secretion • response to nerve growth factor • regulation of ion transmembrane transport • cellular response to toxic substance • response to magnesium ion • ion transport • globus pallidus development • nitric oxide-cGMP-mediated signaling pathway • potassium ion transport • ion transmembrane transport • transmembrane transport • response to amine • positive regulation of potassium ion transmembrane transport • cellular response to nitric oxide • response to light intensity • response to ethanol • protein homooligomerization • response to toxic substance • cellular response to ammonium ion • potassium ion transmembrane transport • positive regulation of voltage-gated potassium channel activity • regulation of presynaptic membrane potential
Potassium voltage-gated channel subfamily C member 2 is a protein that in humans is encoded by the KCNC2 gene.[5][5][6] The protein encoded by this gene is a voltage-gated potassium channel subunit (Kv3.2).[7]
Contents
1Expression pattern
2Physiological role
3Pharmacological properties
4Transcript variants
5References
6External links
Expression pattern
Kv3.1 and Kv3.2 channels are prominently expressed in neurons that fire at high frequency. Kv3.2 channels are prominently expressed in brain (fast-spiking GABAergic interneurons of the neocortex, hippocampus, and caudate nucleus; terminal fields of thalamocortical projections), and in retinal ganglion cells.[8][9][7]
Physiological role
Kv3.1/Kv3.2 conductance is necessary and kinetically optimized for high-frequency action potential generation.[9][10] Sometimes in heteromeric complexes with Kv3.1; important for the high-frequency firing of fast spiking GABAergic interneurons and retinal ganglion cells; and GABA release via regulation of action potential duration in presynaptic terminals.[7][8]
Pharmacological properties
Kv3.2 currents in heterologous systems are highly sensitive to external tetraethylammonium (TEA) or 4-aminopyridine (4-AP) (IC50 values are 0.1 mM for both of the drugs).[7][9] This can be useful in identifying native channels.[9]
Transcript variants
There are four transcript variants of Kv3.2 gene: Kv3.2a, Kv3.2b, Kv3.2c, Kv3.2d. Kv3.2 isoforms differ only in their C-terminal sequence.[11]
References
^ abcGRCh38: Ensembl release 89: ENSG00000166006 - Ensembl, May 2017
^ abcGRCm38: Ensembl release 89: ENSMUSG00000035681 - Ensembl, May 2017
^ abHaas M, Ward DC, Lee J, Roses AD, Clarke V, D'Eustachio P, Lau D, Vega-Saenz de Miera E, Rudy B (Mar 1994). "Localization of Shaw-related K+ channel genes on mouse and human chromosomes". Mamm Genome. 4 (12): 711–5. doi:10.1007/BF00357794. PMID 8111118.
^Gutman GA, Chandy KG, Grissmer S, Lazdunski M, McKinnon D, Pardo LA, Robertson GA, Rudy B, Sanguinetti MC, Stuhmer W, Wang X (Dec 2005). "International Union of Pharmacology. LIII. Nomenclature and molecular relationships of voltage-gated potassium channels". Pharmacol Rev. 57 (4): 473–508. doi:10.1124/pr.57.4.10. PMID 16382104.
^ abcdGutman GA, Chandy KG, Grissmer S, Lazdunski M, McKinnon D, Pardo LA, Robertson GA, Rudy B, Sanguinetti MC, Stühmer W, Wang X (December 2005). "International Union of Pharmacology. LIII. Nomenclature and molecular relationships of voltage-gated potassium channels". Pharmacol. Rev. 57 (4): 473–508. doi:10.1124/pr.57.4.10. PMID 16382104.
^ abKolodin YO (2008-04-27). "Ionic conductances underlying excitability in tonically firing retinal ganglion cells of adult rat". Retrieved 2008-10-20.
^ abcdRudy B, McBain CJ (September 2001). "Kv3 channels: voltage-gated K+ channels designed for high-frequency repetitive firing". Trends in Neurosciences. 24 (9): 517–26. doi:10.1016/S0166-2236(00)01892-0. PMID 11506885.
^Lien CC, Jonas P (March 2003). "Kv3 potassium conductance is necessary and kinetically optimized for high-frequency action potential generation in hippocampal interneurons". Journal of Neuroscience. 23 (6): 2058–68. doi:10.1523/JNEUROSCI.23-06-02058.2003. PMID 12657664.
^Rudy B, Chow A, Lau D, Amarillo Y, Ozaita A, Saganich M, Moreno H, Nadal MS, Hernandez-Pineda R, Hernandez-Cruz A, Erisir A, Leonard C, Vega-Saenz de Miera E (April 1999). "Contributions of Kv3 channels to neuronal excitability". Annals of the New York Academy of Sciences. 868 (1 MOLECULAR AND): 304–43. doi:10.1111/j.1749-6632.1999.tb11295.x. PMID 10414303.
External links
Kv3.2+Potassium+Channel at the US National Library of Medicine Medical Subject Headings (MeSH)
KCNC2+protein,+human at the US National Library of Medicine Medical Subject Headings (MeSH)
v
t
e
Membrane transport protein: ion channels (TC 1A)
Ca2+: Calcium channel
Ligand-gated
Inositol trisphosphate receptor
1
2
3
Ryanodine receptor
1
2
3
Voltage-gated
L-type/Cavα
1.1
1.2
1.3
1.4
N-type/Cavα2.2
P-type/Cavα
2.1
Q-type/Cavα2.1
R-type/Cavα2.3
T-type/Cavα
3.1
3.2
3.3
α2δ-subunits
1
2
β-subunits
β1
β2
β3
β4
γ-subunits
γ1
γ2
γ3
γ4
Cation channels of sperm
1
2
3
4
Two-pore channel
1
2
Na+: Sodium channel
Constitutively active
Epithelial sodium channel
α
β
γ
δ
Proton-gated
Amiloride-sensitive cation channel
1
2
3
4
Voltage-gated
Navα
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
7A
Navβ
1
2
3
4
K+: Potassium channel
Calcium-activated
BK channel
α1
β1
β2
β3
β4
SK channel
SK1
SK2
SK3
IK channel
IK1
KCa
1.1
2.1
2.2
2.3
3.1
4.1
4.2
5.1
Inward-rectifier
KATP
Kir
1.1
2.1
2.2
2.3
2.4
2.6
GIRK/Kir
3.1
3.2
3.3
3.4
Kir
4.1
4.2
5.1
6.1
6.2
7.1
Tandem pore domain
K2P
1
2
3
4
5
6
7
9
10
12
13
15
16
17
18
Voltage-gated
Kvα1-6
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
2.1
2.2
3.1
3.2
3.3
3.4
4.1
4.2
4.3
5.1
6.1
6.2
6.3
6.4
Kvα7-12
7.1
7.2
7.3
7.4
7.5
8.1
8.2
9.1
9.2
9.3
10.1
10.2
11.1/hERG
11.2
11.3
12.1
12.2
12.3
Kvβ
1
2
3
KCNIP
1
2
3
4
minK/ISK
minK/ISK-like
MiRP
1
2
3
Shaker gene
Miscellaneous
Cl−: Chloride channel
Calcium-activated chloride channels
Anoctamin
ANO1
Bestrophin
1
2
Chloride Channel Accessory
1
2
3
4
CFTR
CLCN
1
2
3
4
5
6
7
KA
KB
CLIC
1
2
3
4
5
6
L1
CLNS
1A
1B
H+: Proton channel
HVCN1
M+: CNG cation channel
α
1
2
3
4
β
1
2
3
HCN
FC
1
2
3
4
M+: TRP cation channel
TRPA (1)
TRPC
1
2
3
4
4AP
5
6
7
TRPM
1
2
3
4
5
6
7
8
TRPML
1
2
3
TRPN
TRPP
1
2
TRPV
1
2
3
4
5
6
H2O (+ solutes): Porin
Aquaporin
0
1
2
3
4
5
6
7
8
9
Voltage-dependent anion channel
1
2
3
General bacterial porin family
Cytoplasm: Gap junction
Connexin
A
GJA1
GJA3
GJA4
GJA5
GJA8
GJA9
GJA10
B
GJB1
GJB2
GJB3
GJB4
GJB5
GJB6
GJB7
C
GJC1
GJC2
GJC3
D
GJD2
GJD3
GJD4
Innexin
By gating mechanism
Ion channel class
Ligand-gated
Light-gated
Voltage-gated
Stretch-activated
see also disorders
This membrane protein–related article is a stub. You can help Wikipedia by expanding it.
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