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Protein

Potassium voltage-gated channel subfamily A member 2

Gene

Kcna2

Organism
Rattus norvegicus (Rat)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes, primarily in the brain and the central nervous system, but also in the cardiovascular system. Prevents aberrant action potential firing and regulates neuronal output. Forms tetrameric potassium-selective channels through which potassium ions pass in accordance with their electrochemical gradient. The channel alternates between opened and closed conformations in response to the voltage difference across the membrane (PubMed:12151401, PubMed:21602278, PubMed:24472174). Can form functional homotetrameric channels and heterotetrameric channels that contain variable proportions of KCNA1, KCNA2, KCNA4, KCNA5, KCNA6, KCNA7, and possibly other family members as well; channel properties depend on the type of alpha subunits that are part of the channel (PubMed:8495559, PubMed:15618540, PubMed:20805574, PubMed:23725331). Channel properties are modulated by cytoplasmic beta subunits that regulate the subcellular location of the alpha subunits and promote rapid inactivation of delayed rectifier potassium channels (PubMed:18003609, PubMed:19713757). In vivo, membranes probably contain a mixture of heteromeric potassium channel complexes, making it difficult to assign currents observed in intact tissues to a particular potassium channel family member. Homotetrameric KCNA2 forms a delayed-rectifier potassium channel that opens in response to membrane depolarization, followed by slow spontaneous channel closure (PubMed:1715584, PubMed:16770729, PubMed:17766348, PubMed:18003609, PubMed:18638484, PubMed:19713757, PubMed:20089912). In contrast, a heteromultimer formed by KCNA2 and KCNA4 shows rapid inactivation (PubMed:8495559). Response to toxins that are selective for KCNA1, respectively for KCNA2, suggests that heteromeric potassium channels composed of both KCNA1 and KCNA2 play a role in pacemaking and regulate the output of deep cerebellar nuclear neurons (PubMed:23318870). KCNA2-containing channels play a presynaptic role and prevent hyperexcitability and aberrant action potential firing (PubMed:12777451). Response to toxins that are selective for KCNA2-containing potassium channels suggests that in Purkinje cells, dendritic subthreshold KCNA2-containing potassium channels prevent random spontaneous calcium spikes, suppressing dendritic hyperexcitability without hindering the generation of somatic action potentials, and thereby play an important role in motor coordination (PubMed:16210348). Plays a role in the induction of long-term potentiation of neuron excitability in the CA3 layer of the hippocampus (By similarity). May function as down-stream effector for G protein-coupled receptors and inhibit GABAergic inputs to basolateral amygdala neurons (PubMed:16306173). May contribute to the regulation of neurotransmitter release, such as gamma-aminobutyric acid (GABA) (PubMed:17869444). Contributes to the regulation of the axonal release of the neurotransmitter dopamine (PubMed:21647367). Reduced KCNA2 expression plays a role in the perception of neuropathic pain after peripheral nerve injury, but not acute pain (PubMed:24472174). Plays a role in the regulation of the time spent in non-rapid eye movement (NREM) sleep (By similarity).By similarityCurated20 Publications

Enzyme regulationi

Inhibited by 4-aminopyridine (4-AP), dendrotoxin (DTX) and charybdotoxin (CTX), but not by tetraethylammonium (TEA) (PubMed:2555158, PubMed:8495559, PubMed:18638484). Inhibited by tityustoxin-K alpha (TsTX-Kalpha), a toxin that is highly specific for KCNA2 (PubMed:8355670). Inhibited by maurotoxin (PubMed:24472174). Inhibited by kappaM conotoxins kappaM-RIIIJ and kappaM-RIIIK (By similarity).By similarity6 Publications

Kineticsi

Homotetrameric channels activate rapidly, i.e within a few msec, but inactivation is very slow, with only a marginal decrease in conductance over several seconds. The voltage-dependence of activation and inactivation and other channel characteristics vary depending on the experimental conditions, the expression system, post-translational modifications and the presence or absence of ancillary subunits. For the activation of homotetrameric channels expressed in xenopus oocytes, the voltage at half-maximal amplitude is about -34 mV (PubMed:2555158). Unit channel conductance is about 10 pS (PubMed:2555158). For the activation of homotetrameric channels expressed in Chinese hamster ovary (CHO) cells, the voltage at half-maximal amplitude is about -10 mV (PubMed:17324383).2 Publications

Manual assertion based on experiment ini

      Sites

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Sitei252Important for normal, slow channel gating1 Publication1

      GO - Molecular functioni

      • delayed rectifier potassium channel activity Source: UniProtKB
      • kinesin binding Source: RGD
      • outward rectifier potassium channel activity Source: RGD
      • voltage-gated potassium channel activity Source: UniProtKB

      GO - Biological processi

      • neuronal action potential Source: UniProtKB
      • optic nerve structural organization Source: Ensembl
      • potassium ion transmembrane transport Source: UniProtKB
      • protein homooligomerization Source: InterPro
      • protein oligomerization Source: RGD
      • regulation of circadian sleep/wake cycle, non-REM sleep Source: Ensembl
      • regulation of dopamine secretion Source: UniProtKB
      • sensory perception of pain Source: UniProtKB
      Complete GO annotation...

      Keywords - Molecular functioni

      Ion channel, Potassium channel, Voltage-gated channel

      Keywords - Biological processi

      Ion transport, Potassium transport, Transport

      Keywords - Ligandi

      Potassium

      Enzyme and pathway databases

      ReactomeiR-RNO-1296072. Voltage gated Potassium channels.

      Names & Taxonomyi

      Protein namesi
      Recommended name:
      Potassium voltage-gated channel subfamily A member 2
      Alternative name(s):
      RAK
      RBK21 Publication
      RCK51 Publication
      Voltage-gated potassium channel subunit Kv1.2
      Gene namesi
      Name:Kcna2
      OrganismiRattus norvegicus (Rat)
      Taxonomic identifieri10116 [NCBI]
      Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresGliresRodentiaSciurognathiMuroideaMuridaeMurinaeRattus
      Proteomesi
      • UP000002494 Componenti: Chromosome 2

      Organism-specific databases

      RGDi2950. Kcna2.

      Subcellular locationi

      Topology

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Topological domaini1 – 160Cytoplasmic3 PublicationsAdd BLAST160
      Transmembranei161 – 182Helical; Name=Segment S13 PublicationsAdd BLAST22
      Topological domaini183 – 221Extracellular1 Publication3 PublicationsAdd BLAST39
      Transmembranei222 – 243Helical; Name=Segment S23 PublicationsAdd BLAST22
      Topological domaini244 – 254Cytoplasmic3 PublicationsAdd BLAST11
      Transmembranei255 – 275Helical; Name=Segment S32 PublicationsAdd BLAST21
      Topological domaini276 – 289Extracellular3 PublicationsAdd BLAST14
      Transmembranei290 – 310Helical; Voltage-sensor; Name=Segment S42 PublicationsAdd BLAST21
      Topological domaini311 – 325Cytoplasmic3 PublicationsAdd BLAST15
      Transmembranei326 – 347Helical; Name=Segment S53 PublicationsAdd BLAST22
      Topological domaini348 – 361Extracellular3 PublicationsAdd BLAST14
      Intramembranei362 – 373Helical; Name=Pore helix3 PublicationsAdd BLAST12
      Intramembranei374 – 3813 Publications8
      Topological domaini382 – 388Extracellular3 Publications7
      Transmembranei389 – 417Helical; Name=Segment S63 PublicationsAdd BLAST29
      Topological domaini418 – 499CytoplasmicCurated1 PublicationAdd BLAST82

      GO - Cellular componenti

      • axon terminus Source: UniProtKB
      • cell junction Source: UniProtKB-KW
      • dendrite Source: UniProtKB
      • endoplasmic reticulum membrane Source: UniProtKB-SubCell
      • endosome Source: UniProtKB-SubCell
      • integral component of plasma membrane Source: UniProtKB
      • juxtaparanode region of axon Source: UniProtKB
      • lamellipodium Source: UniProtKB
      • lamellipodium membrane Source: UniProtKB-SubCell
      • neuronal cell body membrane Source: UniProtKB
      • perikaryon Source: UniProtKB
      • potassium channel complex Source: UniProtKB
      • presynaptic membrane Source: UniProtKB-SubCell
      • voltage-gated potassium channel complex Source: UniProtKB
      Complete GO annotation...

      Keywords - Cellular componenti

      Cell junction, Cell membrane, Cell projection, Endoplasmic reticulum, Endosome, Membrane, Synapse, Synaptosome

      Pathology & Biotechi

      Mutagenesis

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Mutagenesisi34R → L: No effect on channel opening. 1 Publication1
      Mutagenesisi38N → A: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi40S → A: No effect on channel opening. 1 Publication1
      Mutagenesisi41G → A: Loss of channel activity. 1 Publication1
      Mutagenesisi42L → A: No effect on channel opening. 1 Publication1
      Mutagenesisi43R → L: No effect on channel opening. 1 Publication1
      Mutagenesisi44F → A: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi45E → A: Loss of channel activity. 1 Publication1
      Mutagenesisi46T → D: Impairs protein folding. Loss of tetramerization. 1 Publication1
      Mutagenesisi46T → V or A: No effect on tetramerization. Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi46T → V: Abolishes interaction with KCNAB2 and strongly reduces cell surface expression. No effect phosphorylation in response to increased cAMP levels. 1 Publication1
      Mutagenesisi47Q → A: No effect on channel opening. 1 Publication1
      Mutagenesisi50T → A: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi70D → A: No effect on channel opening. 1 Publication1
      Mutagenesisi73R → A: No effect on channel opening. 1 Publication1
      Mutagenesisi75E → A: No effect on channel opening. 1 Publication1
      Mutagenesisi77F → W: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi79D → N: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi81N → A: No effect on channel opening. 1 Publication1
      Mutagenesisi82R → A: Loss of channel activity. 1 Publication1
      Mutagenesisi86D → A: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi89L → A: No effect on channel opening. 1 Publication1
      Mutagenesisi90Y → A: No effect on channel opening. 1 Publication1
      Mutagenesisi93Q → A: Loss of channel activity. 1 Publication1
      Mutagenesisi97R → A: No effect on channel opening. 1 Publication1
      Mutagenesisi99R → A: No effect on channel opening. 1 Publication1
      Mutagenesisi102V → T: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi103N → A: No effect on channel opening. 1 Publication1
      Mutagenesisi105P → A: No effect on channel opening. 1 Publication1
      Mutagenesisi107D → A: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi108I → A: No effect on channel opening. 1 Publication1
      Mutagenesisi111E → A: Alters voltage-sensitive channel opening. 1 Publication1
      Mutagenesisi207N → Q: Loss of glycosylation site. 1 Publication1
      Mutagenesisi252T → R: Changes channel gating from a predominantly slow mode to a much more rapid mode. 1 Publication1
      Mutagenesisi267 – 302FITLG…LVRVF → YVTIFLTESNKSVLQFQNVR RVVQIFRIM in paddle chimera; changes channel activation to less negative voltage values and renders the channel susceptible to inhibition by the spider toxin VsTx1. 1 PublicationAdd BLAST36
      Mutagenesisi356S → A: Impairs N-glycosylation and abolishes expression at the cell surface. 1 Publication1
      Mutagenesisi360S → A: No effect on N-glycosylation. Abolishes channel activity of the homotetramer, but retains channel activity in the presence of a beta subunit. 1 Publication1
      Mutagenesisi381V → Y: Confers sensitivity to inhibition by tetraethylammonium (TEA). 1 Publication1
      Mutagenesisi383T → A: Impairs N-glycosylation and abolishes expression at the cell surface. 1 Publication1
      Mutagenesisi415Y → F: Nearly abolishes interaction with CTTN; when associated with F-417. 1 Publication1
      Mutagenesisi417Y → F: Nearly abolishes interaction with CTTN; when associated with F-415. Strongly reduces channel activity. 1 Publication1
      Mutagenesisi440S → A: Strongly reduces cell surface expression. Abolishes phosphorylation in response to increased cAMP levels. 1 Publication1
      Mutagenesisi449S → A: Strongly reduces cell surface expression. Abolishes phosphorylation in response to increased cAMP levels. 1 Publication1
      Mutagenesisi458Y → A: Impairs clustering on axon membranes. 1 Publication1

      Chemistry databases

      GuidetoPHARMACOLOGYi539.

      PTM / Processingi

      Molecule processing

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      ChainiPRO_00000539751 – 499Potassium voltage-gated channel subfamily A member 2Add BLAST499

      Amino acid modifications

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Glycosylationi207N-linked (GlcNAc...)Sequence analysis1 Publication1
      Lipidationi244S-palmitoyl cysteineSequence analysis1
      Modified residuei429PhosphotyrosineBy similarity1
      Modified residuei434PhosphoserineBy similarity1
      Modified residuei440PhosphoserineCombined sources1 Publication1
      Modified residuei441PhosphoserineCombined sources1
      Modified residuei449Phosphoserine2 Publications1
      Modified residuei458Phosphotyrosine1 Publication1
      Modified residuei468PhosphoserineCombined sources1

      Post-translational modificationi

      Phosphorylated on tyrosine residues; phosphorylation increases in response to ischemia (PubMed:14713306). Phosphorylated on tyrosine residues by activated PTK2B/PYK2 (PubMed:7544443). Phosphorylation on tyrosine residues suppresses ion channel activity (PubMed:7544443). Phosphorylated on tyrosine residues in response to CHRM1 activation; this abolishes interaction with CTTN (PubMed:12151401). This is probably due to endocytosis of the phosphorylated channel subunits. Phosphorylated on serine residues in response to increased cAMP levels; phosphorylation is apparently not catalyzed by PKA (PubMed:18003609).4 Publications
      N-glycosylated, with complex, sialylated N-glycans.2 Publications

      Keywords - PTMi

      Glycoprotein, Lipoprotein, Palmitate, Phosphoprotein

      Proteomic databases

      PaxDbiP63142.
      PRIDEiP63142.

      PTM databases

      iPTMnetiP63142.
      PhosphoSitePlusiP63142.

      Expressioni

      Tissue specificityi

      Detected in neurons in dorsal root ganglion (PubMed:24472174). Detected in hippocampus neurons (PubMed:21602278). Detected on neurons of the anteroventral cochlear nucleus (PubMed:12777451). Detected in renal arteries (PubMed:12632190). Detected in neurons of the medial nucleus of the trapezoid body (PubMed:12177193). Detected in neurons in the brain cortex (PubMed:14713306). Detected in axon tracts of the corpus callosum, specific terminal fields of the brain cortex neuropil, neurons in the medial entorhinal cortex, and in puncta representing mossy fiber terminals in the hippocampus mossy fiber tract; these puncta correspond to synapses made by dentate granule cells (PubMed:8361540). Detected in paranodal and juxtanodal zones in the central nervous system, including myelinated spinal cord (PubMed:11086297, PubMed:20089912). Detected in the juxtaparanodal region in optic nerve (PubMed:10624965). Detected at nerve terminal plexuses of basket cells in the cerebellum (at protein level) (PubMed:7477295, PubMed:20089912). Detected in brain (PubMed:2722779). Detected in heart atrium and ventricle (PubMed:1715584). Detected in renal arteries (PubMed:12632190).12 Publications

      Inductioni

      Up-regulated in brain cortex in response to ischemia (at protein level) (PubMed:14713306). Down-regulated in dorsal root ganglion neurons after peripheral nerve injury (at protein level) (PubMed:24472174). Down-regulated in pulmonary artery myocytes in response to chronic moderate hypoxia.3 Publications

      Gene expression databases

      BgeeiENSRNOG00000018285.
      ExpressionAtlasiP63142. baseline and differential.
      GenevisibleiP63142. RN.

      Interactioni

      Subunit structurei

      Homotetramer and heterotetramer with other channel-forming alpha subunits, such as KCNA1, KCNA4, KCNA5, KCNA6 and KCNA7 (PubMed:8495559, PubMed:8361540, PubMed:10896669, PubMed:12777451, PubMed:12632190, PubMed:15618540, PubMed:11007484, PubMed:16002581, PubMed:18004376, PubMed:20534430). Channel activity is regulated by interaction with beta subunits, including KCNAB1 and KCNAB2 (PubMed:18003609, PubMed:19713757, PubMed:16002581, PubMed:18004376, PubMed:20534430, PubMed:20360102, PubMed:23705070). Identified in a complex with KCNA1 and KCNAB2 (PubMed:11086297, PubMed:23318870). Identified in a complex with KCNA5 and KCNAB1 (By similarity). Identified in a complex with KCNA4 and FYN (By similarity). Interacts (via C-terminus) with the PDZ domains of DLG1 and DLG2 (PubMed:7477295). Interacts with DLG4 (via PDZ domain) (PubMed:7477295, PubMed:20089912). Interacts with PTK2B (PubMed:11739373). Interacts (via C-terminus) with CTTN (PubMed:12151401). Interacts (via N-terminal cytoplasmic domain) with RHOA (GTP-bound form); this regulates channel activity by reducing location at the cell surface in response to CHRM1 activation (PubMed:9635436). Interacts with DRD2 (By similarity). Interacts with SIGMAR1; cocaine consumption leads to increased interaction (By similarity). Interacts with CNTNAP2 (PubMed:10624965). Interacts with ADAM22 (PubMed:20089912).By similarityCurated20 Publications

      Binary interactionsi

      WithEntry#Exp.IntActNotes
      DLG4P783522EBI-631446,EBI-80389From a different organism.

      GO - Molecular functioni

      • kinesin binding Source: RGD

      Protein-protein interaction databases

      BioGridi247501. 5 interactors.
      IntActiP63142. 3 interactors.
      STRINGi10116.ENSRNOP00000042653.

      Structurei

      Secondary structure

      1499
      Legend: HelixTurnBeta strandPDB Structure known for this area
      Show more details
      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Beta strandi34 – 39Combined sources6
      Beta strandi42 – 47Combined sources6
      Helixi48 – 52Combined sources5
      Turni58 – 60Combined sources3
      Helixi62 – 66Combined sources5
      Turni71 – 74Combined sources4
      Beta strandi75 – 78Combined sources4
      Turni82 – 84Combined sources3
      Helixi85 – 93Combined sources9
      Helixi106 – 116Combined sources11
      Helixi120 – 130Combined sources11
      Turni143 – 145Combined sources3
      Helixi146 – 149Combined sources4
      Turni150 – 154Combined sources5
      Beta strandi156 – 158Combined sources3
      Helixi160 – 182Combined sources23
      Helixi186 – 189Combined sources4
      Beta strandi190 – 192Combined sources3
      Turni193 – 196Combined sources4
      Helixi202 – 210Combined sources9
      Helixi221 – 241Combined sources21
      Turni249 – 252Combined sources4
      Helixi254 – 261Combined sources8
      Helixi279 – 282Combined sources4
      Helixi291 – 299Combined sources9
      Helixi304 – 309Combined sources6
      Helixi312 – 323Combined sources12
      Helixi325 – 351Combined sources27
      Helixi361 – 372Combined sources12
      Beta strandi378 – 380Combined sources3
      Helixi385 – 403Combined sources19
      Helixi406 – 418Combined sources13

      3D structure databases

      Select the link destinations:
      PDBei
      RCSB PDBi
      PDBji
      Links Updated
      PDB entryMethodResolution (Å)ChainPositionsPDBsum
      1DSXX-ray1.60A/B/C/D/E/F/G/H33-119[»]
      1QDVX-ray1.60A/B/C/D33-131[»]
      1QDWX-ray2.10A/B/C/D/E/F/G/H33-119[»]
      2A79X-ray2.90B1-499[»]
      2R9RX-ray2.40B/H1-499[»]
      3LNMX-ray2.90B/D1-266[»]
      B/D303-499[»]
      3LUTX-ray2.90B1-499[»]
      4JTAX-ray2.50B/Q1-266[»]
      B/Q304-499[»]
      4JTCX-ray2.56B/H1-266[»]
      B/H304-499[»]
      4JTDX-ray2.54B/H1-266[»]
      B/H304-499[»]
      ProteinModelPortaliP63142.
      SMRiP63142.
      ModBaseiSearch...
      MobiDBiSearch...

      Miscellaneous databases

      EvolutionaryTraceiP63142.

      Family & Domainsi

      Region

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Regioni1 – 125Tetramerization domain1 PublicationAdd BLAST125
      Regioni312 – 325S4-S5 linker1 PublicationAdd BLAST14

      Motif

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Motifi374 – 379Selectivity filterCurated6
      Motifi497 – 499PDZ-binding1 Publication3

      Domaini

      The cytoplasmic N-terminus is important for tetramerization. Interactions between the different subunits modulate the gating characteristics (PubMed:11007484). Besides, the cytoplasmic N-terminal domain mediates interaction with RHOA and thus is required for RHOA-mediated endocytosis (PubMed:9635436).3 Publications
      The transmembrane segment S4 functions as voltage-sensor and is characterized by a series of positively charged amino acids at every third position. Channel opening and closing is effected by a conformation change that affects the position and orientation of the voltage-sensor paddle formed by S3 and S4 within the membrane. A transmembrane electric field that is positive inside would push the positively charged S4 segment outwards, thereby opening the pore, while a field that is negative inside would pull the S4 segment inwards and close the pore. Changes in the position and orientation of S4 are then transmitted to the activation gate formed by the inner helix bundle via the S4-S5 linker region.2 Publications

      Sequence similaritiesi

      Keywords - Domaini

      Transmembrane, Transmembrane helix

      Phylogenomic databases

      eggNOGiKOG1545. Eukaryota.
      COG1226. LUCA.
      GeneTreeiENSGT00760000118846.
      HOGENOMiHOG000231015.
      HOVERGENiHBG052230.
      InParanoidiP63142.
      KOiK04875.
      OMAiMTFHTYS.
      OrthoDBiEOG091G10NU.
      PhylomeDBiP63142.
      TreeFamiTF313103.

      Family and domain databases

      Gene3Di1.20.120.350. 1 hit.
      InterProiIPR000210. BTB/POZ_dom.
      IPR027359. Channel_four-helix_dom.
      IPR005821. Ion_trans_dom.
      IPR003968. K_chnl_volt-dep_Kv.
      IPR003972. K_chnl_volt-dep_Kv1.
      IPR004049. K_chnl_volt-dep_Kv1.2.
      IPR011333. SKP1/BTB/POZ.
      IPR003131. T1-type_BTB.
      IPR028325. VG_K_chnl.
      [Graphical view]
      PANTHERiPTHR11537. PTHR11537. 1 hit.
      PfamiPF02214. BTB_2. 1 hit.
      PF00520. Ion_trans. 1 hit.
      [Graphical view]
      PRINTSiPR00169. KCHANNEL.
      PR01509. KV12CHANNEL.
      PR01491. KVCHANNEL.
      PR01496. SHAKERCHANEL.
      SMARTiSM00225. BTB. 1 hit.
      [Graphical view]
      SUPFAMiSSF54695. SSF54695. 1 hit.

      Sequencei

      Sequence statusi: Complete.

      P63142-1 [UniParc]FASTAAdd to basket

      « Hide

              10         20         30         40         50
      MTVATGDPVD EAAALPGHPQ DTYDPEADHE CCERVVINIS GLRFETQLKT
      60 70 80 90 100
      LAQFPETLLG DPKKRMRYFD PLRNEYFFDR NRPSFDAILY YYQSGGRLRR
      110 120 130 140 150
      PVNVPLDIFS EEIRFYELGE EAMEMFREDE GYIKEEERPL PENEFQRQVW
      160 170 180 190 200
      LLFEYPESSG PARIIAIVSV MVILISIVSF CLETLPIFRD ENEDMHGGGV
      210 220 230 240 250
      TFHTYSNSTI GYQQSTSFTD PFFIVETLCI IWFSFEFLVR FFACPSKAGF
      260 270 280 290 300
      FTNIMNIIDI VAIIPYFITL GTELAEKPED AQQGQQAMSL AILRVIRLVR
      310 320 330 340 350
      VFRIFKLSRH SKGLQILGQT LKASMRELGL LIFFLFIGVI LFSSAVYFAE
      360 370 380 390 400
      ADERDSQFPS IPDAFWWAVV SMTTVGYGDM VPTTIGGKIV GSLCAIAGVL
      410 420 430 440 450
      TIALPVPVIV SNFNYFYHRE TEGEEQAQYL QVTSCPKIPS SPDLKKSRSA
      460 470 480 490
      STISKSDYME IQEGVNNSNE DFREENLKTA NCTLANTNYV NITKMLTDV
      Length:499
      Mass (Da):56,701
      Last modified:September 13, 2004 - v1
      Checksum:iA8FEA6F3F59AF42A
      GO

      Experimental Info

      Feature keyPosition(s)DescriptionActionsGraphical viewLength
      Sequence conflicti411S → F in AAA19867 (PubMed:1715584).Curated1

      Sequence databases

      Select the link destinations:
      EMBLi
      GenBanki
      DDBJi
      Links Updated
      J04731 mRNA. Translation: AAA40819.1.
      X16003 mRNA. Translation: CAA34134.1.
      M74449 mRNA. Translation: AAA19867.1.
      PIRiA33814.
      RefSeqiNP_037102.1. NM_012970.3.
      XP_006233194.1. XM_006233132.3.
      XP_006233195.1. XM_006233133.3.
      XP_006233196.1. XM_006233134.3.
      XP_006233197.1. XM_006233135.3.
      XP_008759593.1. XM_008761371.2.
      UniGeneiRn.10298.
      Rn.40779.

      Genome annotation databases

      EnsembliENSRNOT00000050149; ENSRNOP00000042653; ENSRNOG00000018285.
      ENSRNOT00000092365; ENSRNOP00000075841; ENSRNOG00000018285.
      ENSRNOT00000092450; ENSRNOP00000075852; ENSRNOG00000018285.
      GeneIDi25468.
      KEGGirno:25468.

      Cross-referencesi

      Sequence databases

      Select the link destinations:
      EMBLi
      GenBanki
      DDBJi
      Links Updated
      J04731 mRNA. Translation: AAA40819.1.
      X16003 mRNA. Translation: CAA34134.1.
      M74449 mRNA. Translation: AAA19867.1.
      PIRiA33814.
      RefSeqiNP_037102.1. NM_012970.3.
      XP_006233194.1. XM_006233132.3.
      XP_006233195.1. XM_006233133.3.
      XP_006233196.1. XM_006233134.3.
      XP_006233197.1. XM_006233135.3.
      XP_008759593.1. XM_008761371.2.
      UniGeneiRn.10298.
      Rn.40779.

      3D structure databases

      Select the link destinations:
      PDBei
      RCSB PDBi
      PDBji
      Links Updated
      PDB entryMethodResolution (Å)ChainPositionsPDBsum
      1DSXX-ray1.60A/B/C/D/E/F/G/H33-119[»]
      1QDVX-ray1.60A/B/C/D33-131[»]
      1QDWX-ray2.10A/B/C/D/E/F/G/H33-119[»]
      2A79X-ray2.90B1-499[»]
      2R9RX-ray2.40B/H1-499[»]
      3LNMX-ray2.90B/D1-266[»]
      B/D303-499[»]
      3LUTX-ray2.90B1-499[»]
      4JTAX-ray2.50B/Q1-266[»]
      B/Q304-499[»]
      4JTCX-ray2.56B/H1-266[»]
      B/H304-499[»]
      4JTDX-ray2.54B/H1-266[»]
      B/H304-499[»]
      ProteinModelPortaliP63142.
      SMRiP63142.
      ModBaseiSearch...
      MobiDBiSearch...

      Protein-protein interaction databases

      BioGridi247501. 5 interactors.
      IntActiP63142. 3 interactors.
      STRINGi10116.ENSRNOP00000042653.

      Chemistry databases

      GuidetoPHARMACOLOGYi539.

      PTM databases

      iPTMnetiP63142.
      PhosphoSitePlusiP63142.

      Proteomic databases

      PaxDbiP63142.
      PRIDEiP63142.

      Protocols and materials databases

      Structural Biology KnowledgebaseSearch...

      Genome annotation databases

      EnsembliENSRNOT00000050149; ENSRNOP00000042653; ENSRNOG00000018285.
      ENSRNOT00000092365; ENSRNOP00000075841; ENSRNOG00000018285.
      ENSRNOT00000092450; ENSRNOP00000075852; ENSRNOG00000018285.
      GeneIDi25468.
      KEGGirno:25468.

      Organism-specific databases

      CTDi3737.
      RGDi2950. Kcna2.

      Phylogenomic databases

      eggNOGiKOG1545. Eukaryota.
      COG1226. LUCA.
      GeneTreeiENSGT00760000118846.
      HOGENOMiHOG000231015.
      HOVERGENiHBG052230.
      InParanoidiP63142.
      KOiK04875.
      OMAiMTFHTYS.
      OrthoDBiEOG091G10NU.
      PhylomeDBiP63142.
      TreeFamiTF313103.

      Enzyme and pathway databases

      ReactomeiR-RNO-1296072. Voltage gated Potassium channels.

      Miscellaneous databases

      EvolutionaryTraceiP63142.
      PROiP63142.

      Gene expression databases

      BgeeiENSRNOG00000018285.
      ExpressionAtlasiP63142. baseline and differential.
      GenevisibleiP63142. RN.

      Family and domain databases

      Gene3Di1.20.120.350. 1 hit.
      InterProiIPR000210. BTB/POZ_dom.
      IPR027359. Channel_four-helix_dom.
      IPR005821. Ion_trans_dom.
      IPR003968. K_chnl_volt-dep_Kv.
      IPR003972. K_chnl_volt-dep_Kv1.
      IPR004049. K_chnl_volt-dep_Kv1.2.
      IPR011333. SKP1/BTB/POZ.
      IPR003131. T1-type_BTB.
      IPR028325. VG_K_chnl.
      [Graphical view]
      PANTHERiPTHR11537. PTHR11537. 1 hit.
      PfamiPF02214. BTB_2. 1 hit.
      PF00520. Ion_trans. 1 hit.
      [Graphical view]
      PRINTSiPR00169. KCHANNEL.
      PR01509. KV12CHANNEL.
      PR01491. KVCHANNEL.
      PR01496. SHAKERCHANEL.
      SMARTiSM00225. BTB. 1 hit.
      [Graphical view]
      SUPFAMiSSF54695. SSF54695. 1 hit.
      ProtoNetiSearch...

      Entry informationi

      Entry nameiKCNA2_RAT
      AccessioniPrimary (citable) accession number: P63142
      Secondary accession number(s): P15386, Q02010
      Entry historyi
      Integrated into UniProtKB/Swiss-Prot: September 13, 2004
      Last sequence update: September 13, 2004
      Last modified: November 2, 2016
      This is version 125 of the entry and version 1 of the sequence. [Complete history]
      Entry statusiReviewed (UniProtKB/Swiss-Prot)
      Annotation programChordata Protein Annotation Program

      Miscellaneousi

      Miscellaneous

      The delay or D-type current observed in hippocampus pyramidal neurons is probably mediated by potassium channels containing KCNA2 plus KCNA1 or other family members. It is activated at about -50 mV, i.e. below the action potential threshold, and is characterized by slow inactivation, extremely slow recovery from inactivation, sensitivity to dendrotoxin (DTX) and to 4-aminopyridine (4-AP).1 Publication

      Keywords - Technical termi

      3D-structure, Complete proteome, Reference proteome

      Documents

      1. PDB cross-references
        Index of Protein Data Bank (PDB) cross-references
      2. SIMILARITY comments
        Index of protein domains and families

      Similar proteinsi

      Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
      100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
      90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
      50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.