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0KCNA3_HUMAN*   SwissProt (?) | Description Local Annotation Link Reference
General Information
NameKCNA3
DescriptionPotassium voltage-gated channel subfamily a member 3 (voltage-gated potassium channel subunit kv1.3) (hpcn3) (hgk5) (hukiii) (hlk3).
SpeciesHomo sapiens (NCBI taxonomy ID: 9606)
GO0008076 voltage-gated potassium channel complex (TAS)
0005251 delayed rectifier potassium channel activity (TAS)
0005244 voltage-gated ion channel activity (TAS)
0006813 potassium ion transport (TAS)

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schematic display of those terms with internal associations, click the node and browse the corresponding GO term
Domain Architecture (Details)
InterPro domains assigned to SynO:
Potassium channels are the most diverse group of the ion channel family. They are important in shaping the action potential.nd in neuronal excitability and plasticity . The potassium channel family iscomposed of several functionally distinct isoforms.hich can be broadlyseparated into 2 groups : the practically non-inactivating delayed group and the rapidly inactivating transient group.These are all highly similar proteins.ith only small amino acidchanges causing the diversity of the voltage-dependent gating mechanism.hannel conductance and toxin binding properties. Each type of K+ channel is activated by different signals and conditions depending on their type of regulation: some open in response to depolarisation of the plasma membrane; others in response to hyperpolarisation or an increase in intracellular calcium concentration; some can be regulated by binding of a transmitter.ogether with intracellular kinases; and others are regulated by GTP-binding proteins orother second messengers . In eukaryotic cells.+ channelsare involved in neural signalling and generation of the cardiac rhythm.ct as effectors in signal transduction pathways involving G protein-coupled receptors (GPCRs) and may have a role in target cell lysis by cytotoxic T-lymphocytes . In prokaryotic cells.hey play a role in themaintenance of ionic homeostasis . All K+ channels discovered so far possess a core of alpha subunits.ach comprising either one or two copies of a highly conserved pore loop domain (P-domain). The P-domain contains the sequence (T/SxxTxGxG).hich hasbeen termed the K+ selectivity sequence.In families that contain one P-domain.our subunits assemble to form a selective pathway for K+ across the membrane.However.t remains unclear how the 2 P-domain subunits assemble to form a selective pore. The functional diversity of these families can arise through homo- or hetero-associations of alpha subunits or association with auxiliary cytoplasmic beta subunits. K+ channel subunits containing one pore domain can be assigned into one of two superfamilies: those that possess six transmembrane (TM) domains and those that possess only two TM domains. The six TM domain superfamily can be further subdivided into conserved gene families: the voltage-gated (Kv) channels; the KCNQ channels (originally known as KvLQT channels); the EAG-like K+ channels; and three types of calcium (Ca)-activated K+ channels (BK.K and SK). The 2TM domain family comprises inward-rectifying K+ channels. In addition.here are K+ channel alpha-subunits that possess two P-domains. These are usually highly regulated K+ selective leak channels. The Kv family can be divided into 4 subfamilies on the basis of sequence similarity and function: Shaker (Kv1).hab (Kv2).haw (Kv3) and Shal (Kv4). All consist of pore-forming alpha subunits that associate with different types of beta subunit. Each alpha subunit comprises six hydrophobic TM domains with a P-domain between the fifth and sixth.hich partially resides in the membrane. The fourth TM domain has positively charged residues at every third residue and acts as a voltage sensor.hich triggers the conformational change that opens the channel pore in response to a displacement in membrane potential .
  IPR003968:Kv channel
Potassium channels are the most diverse group of the ion channel family. They are important in shaping the action potential.nd in neuronal excitability and plasticity . The potassium channel family iscomposed of several functionally distinct isoforms.hich can be broadlyseparated into 2 groups : the practically non-inactivating delayed group and the rapidly inactivating transient group.These are all highly similar proteins.ith only small amino acidchanges causing the diversity of the voltage-dependent gating mechanism.hannel conductance and toxin binding properties. Each type of K+ channel is activated by different signals and conditions depending on their type of regulation: some open in response to depolarisation of the plasma membrane; others in response to hyperpolarisation or an increase in intracellular calcium concentration; some can be regulated by binding of a transmitter.ogether with intracellular kinases; and others are regulated by GTP-binding proteins orother second messengers . In eukaryotic cells.+ channelsare involved in neural signalling and generation of the cardiac rhythm.ct as effectors in signal transduction pathways involving G protein-coupled receptors (GPCRs) and may have a role in target cell lysis by cytotoxic T-lymphocytes . In prokaryotic cells.hey play a role in themaintenance of ionic homeostasis . All K+ channels discovered so far possess a core of alpha subunits.ach comprising either one or two copies of a highly conserved pore loop domain (P-domain). The P-domain contains the sequence (T/SxxTxGxG).hich hasbeen termed the K+ selectivity sequence.In families that contain one P-domain.our subunits assemble to form a selective pathway for K+ across the membrane.However.t remains unclear how the 2 P-domain subunits assemble to form a selective pore. The functional diversity of these families can arise through homo- or hetero-associations of alpha subunits or association with auxiliary cytoplasmic beta subunits. K+ channel subunits containing one pore domain can be assigned into one of two superfamilies: those that possess six transmembrane (TM) domains and those that possess only two TM domains. The six TM domain superfamily can be further subdivided into conserved gene families: the voltage-gated (Kv) channels; the KCNQ channels (originally known as KvLQT channels); the EAG-like K+ channels; and three types of calcium (Ca)-activated K+ channels (BK.K and SK). The 2TM domain family comprises inward-rectifying K+ channels. In addition.here are K+ channel alpha-subunits that possess two P-domains. These are usually highly regulated K+ selective leak channels. The Kv family can be divided into 4 subfamilies on the basis of sequence similarity and function: Shaker (Kv1).hab (Kv2).haw (Kv3) and Shal (Kv4). All consist of pore-forming alpha subunits that associate with different types of beta subunit. Each alpha subunit comprises six hydrophobic TM domains with a P-domain between the fifth and sixth.hich partially resides in the membrane. The fourth TM domain has positively charged residues at every third residue and acts as a voltage sensor.hich triggers the conformational change that opens the channel pore in response to a displacement in membrane potential . The first Shaker (Kv1) sequence was found in Drosophila melanogaster. Several vertebrate K+ channels with similar amino acid sequences were subsequently found and.ogether with the Drosophila melanogaster Shaker channel.ow constitute the Shaker (Kv1) family. These channels are mostly expressed in the brain.ut can also be found in non-excitable cells.uch as lymphocytes .
  IPR003972:Shaker voltage-gated K+ channel
InterPro domains unassigned to SynO:
The N-terminal.ytoplasmic tetramerization domain (T1) of voltage-gated K+ channels encodes molecular determinants for subfamily-specific assembly of alpha-subunits into functional tetrameric channels . This domain is found in a subset of a larger group of proteins that obtain BTB/POZ domain.
  IPR003131:K+ channel tetramerisation
This group of proteins is found in sodium.otassium.nd calcium ion channels proteins. The proteins have 6 transmembrane helices in which the last two helices flank a loop which determines ion selectivity. In some Na channels proteins the domain is repeated four times.hereas in others (e.g. K channels) the protein forms a tetramer in the membrane. A bacterial structure of the protein is known for the last two helices but is not included in the Pfam family due to it lacking the first four helices.
  IPR005821:Ion transport
The BTB (for BR-C.tk and bab) or POZ (for Pox virus and Zinc finger) domain is present near the N terminus of a fraction of zinc finger() proteins and in proteins that contain the motif such as Kelch and a family of pox virus proteins.The BTB/POZ domain mediates homomeric dimerisation and in some instancesheteromeric dimerisation .The structure of the dimerised PLZF BTB/POZ domain has been solved andconsists of a tightly intertwined homodimer. The central scaffolding ofthe protein is made up of a cluster of alpha-helices flanked by shortbeta-sheets at both the top and bottom of the molecule .POZ domains from several zinc finger proteins have been shown to mediatetranscriptional repression and to interact with components of histonedeacetylase co-repressor complexes including N-CoR and SMRT .The POZ or BTB domain is also known as BR-C/Ttk or ZiN.
  IPR000210:BTB
Potassium channels are the most diverse group of the ion channel family. They are important in shaping the action potential.nd in neuronal excitability and plasticity . The potassium channel family iscomposed of several functionally distinct isoforms.hich can be broadlyseparated into 2 groups : the practically non-inactivating delayed group and the rapidly inactivating transient group.These are all highly similar proteins.ith only small amino acidchanges causing the diversity of the voltage-dependent gating mechanism.hannel conductance and toxin binding properties. Each type of K+ channel is activated by different signals and conditions depending on their type of regulation: some open in response to depolarisation of the plasma membrane; others in response to hyperpolarisation or an increase in intracellular calcium concentration; some can be regulated by binding of a transmitter.ogether with intracellular kinases; and others are regulated by GTP-binding proteins orother second messengers . In eukaryotic cells.+ channelsare involved in neural signalling and generation of the cardiac rhythm.ct as effectors in signal transduction pathways involving G protein-coupled receptors (GPCRs) and may have a role in target cell lysis by cytotoxic T-lymphocytes . In prokaryotic cells.hey play a role in themaintenance of ionic homeostasis . All K+ channels discovered so far possess a core of alpha subunits.ach comprising either one or two copies of a highly conserved pore loop domain (P-domain). The P-domain contains the sequence (T/SxxTxGxG).hich hasbeen termed the K+ selectivity sequence.In families that contain one P-domain.our subunits assemble to form a selective pathway for K+ across the membrane.However.t remains unclear how the 2 P-domain subunits assemble to form a selective pore. The functional diversity of these families can arise through homo- or hetero-associations of alpha subunits or association with auxiliary cytoplasmic beta subunits. K+ channel subunits containing one pore domain can be assigned into one of two superfamilies: those that possess six transmembrane (TM) domains and those that possess only two TM domains. The six TM domain superfamily can be further subdivided into conserved gene families: the voltage-gated (Kv) channels; the KCNQ channels (originally known as KvLQT channels); the EAG-like K+ channels; and three types of calcium (Ca)-activated K+ channels (BK.K and SK). The 2TM domain family comprises inward-rectifying K+ channels. In addition.here are K+ channel alpha-subunits that possess two P-domains. These are usually highly regulated K+ selective leak channels.
  IPR003091:Voltage-dependent potassium channel
Potassium channels are the most diverse group of the ion channel family. They are important in shaping the action potential.nd in neuronal excitability and plasticity . The potassium channel family iscomposed of several functionally distinct isoforms.hich can be broadlyseparated into 2 groups : the practically non-inactivating delayed group and the rapidly inactivating transient group.These are all highly similar proteins.ith only small amino acidchanges causing the diversity of the voltage-dependent gating mechanism.hannel conductance and toxin binding properties. Each type of K+ channel is activated by different signals and conditions depending on their type of regulation: some open in response to depolarisation of the plasma membrane; others in response to hyperpolarisation or an increase in intracellular calcium concentration; some can be regulated by binding of a transmitter.ogether with intracellular kinases; and others are regulated by GTP-binding proteins orother second messengers . In eukaryotic cells.+ channelsare involved in neural signalling and generation of the cardiac rhythm.ct as effectors in signal transduction pathways involving G protein-coupled receptors (GPCRs) and may have a role in target cell lysis by cytotoxic T-lymphocytes . In prokaryotic cells.hey play a role in themaintenance of ionic homeostasis . All K+ channels discovered so far possess a core of alpha subunits.ach comprising either one or two copies of a highly conserved pore loop domain (P-domain). The P-domain contains the sequence (T/SxxTxGxG).hich hasbeen termed the K+ selectivity sequence.In families that contain one P-domain.our subunits assemble to form a selective pathway for K+ across the membrane.However.t remains unclear how the 2 P-domain subunits assemble to form a selective pore. The functional diversity of these families can arise through homo- or hetero-associations of alpha subunits or association with auxiliary cytoplasmic beta subunits. K+ channel subunits containing one pore domain can be assigned into one of two superfamilies: those that possess six transmembrane (TM) domains and those that possess only two TM domains. The six TM domain superfamily can be further subdivided into conserved gene families: the voltage-gated (Kv) channels; the KCNQ channels (originally known as KvLQT channels); the EAG-like K+ channels; and three types of calcium (Ca)-activated K+ channels (BK.K and SK). The 2TM domain family comprises inward-rectifying K+ channels. In addition.here are K+ channel alpha-subunits that possess two P-domains. These are usually highly regulated K+ selective leak channels. The Kv family can be divided into 4 subfamilies on the basis of sequence similarity and function: Shaker (Kv1).hab (Kv2).haw (Kv3) and Shal (Kv4). All consist of pore-forming alpha subunits that associate with different types of beta subunit. Each alpha subunit comprises six hydrophobic TM domains with a P-domain between the fifth and sixth.hich partially resides in the membrane. The fourth TM domain has positively charged residues at every third residue and acts as a voltage sensor.hich triggers the conformational change that opens the channel pore in response to a displacement in membrane potential .The first Shaker (Kv1) sequence was found in Drosophila melanogaster. Several vertebrateK+ channels with similar amino acid sequences were subsequently found and.ogether with the D. melanogaster Shaker channel.ow constitute the Shaker (Kv1) family. These channels are mostly expressed in the brain.ut can also befound in non-excitable cells.uch as lymphocytes . Kv1.3 subunits are expressed in T-lymphocytes.icroglia and osteoclasts. In activated T-lymphocytes.hey maintain the secretion of the lymphokineIL-2. They are also believed to be responsible for the decrease in regulatory volume in response to hypotonic shock.nd a Kv1.3 homologue has predicted roles in renal medullary K+ transport .
  IPR004050:Kv1.3 voltage-gated K+ channel
IPR003131:K_tetra 
Evalue:-48.6197891235352 
Location:54-145IPR005821:Ion_trans 
Evalue:-47.6989707946777 
Location:245-427IPR003091:KCHANNEL 
Evalue:0 
Location:175-203IPR004050:KV13CHANNEL 
Evalue:0 
Location:1-19IPR004050:KV13CHANNEL 
Evalue:0 
Location:218-235IPR004050:KV13CHANNEL 
Evalue:0 
Location:31-38
SequencesProtein: KCNA3_HUMAN (523 aa)
mRNA: BC035059
Local Annotation
Synapse Ontology
this kind of receptor usually locates at the postsynaptic plasma membranous region.
sdb:0109 ionotropic receptor  (Evidence:domains)
K channel plays an important role in the course of action potential
sdb:0286 K channel  (Evidence:domains)
all kinds of ion channels that play their roles in the synaptic activity.
sdb:0308 ion channels and receptors  (Evidence:domains)
KO assignmentK04876
  Level 3 annotation:
    potassium voltage-gated channel, Shaker-related subfamily A, member 3
  Level 2 annotation:
    Ion channels
Loci Structure (Details)Loci index, Chromosomal location, Length, Possible relational loci clusterExon1: 856 residues, 111016613-111019178Exon2: 2 residues, -Jump to KCNA3_HUMANExon1: 856 residues, 111016613-111019178Exon2: 2 residues, -Jump to KCNA3_HUMAN  
Tune and view alternative isoforms
Loci Cluster (Details)Loci: 2536 110555499-110577591 ~-22K 2125(KCNC4)(+)Loci: 3815 110745401-110752087 ~-7K 2136(HBXIP)(-)Loci: 3816 110861361-110863320 ~-2K 2139(-)Loci: 3817 110937725-110975619 ~-38K 2140(-)Loci: 3818 111016613-111019178 ~-3K 2142(KCNA3)(-)Loci: 2535 110494630-110546344 ~-52K 2123(SLC6A17)(+)Link out to UCSC