Selected-GenAtlas references SOURCE GeneCards NCBI Gene Swiss-Prot Ensembl
HGNC UniGene Nucleotide OMIM UCSC
Home Page
FLASH GENE
Symbol KCNK3 contributors: npt/mct - updated : 28-02-2017
HGNC name potassium channel, subfamily K, member 3
HGNC id 6278
Corresponding disease
PPH4 pulmonary hypertension, primary, 4
Location 2p23.3      Physical location : 26.915.580 - 26.954.066
Synonym name
  • TWIK-related acid-sensitive K+ channel
  • acid-sensitive potassium channel protein TASK
  • cardiac potassium channel
  • two P domain potassium channel
  • Synonym symbol(s) OAT1, TASK, TBAK1, TASK-1, TASK1, K2p3.1
    DNA
    TYPE functioning gene
    STRUCTURE 38.49 kb     2 Exon(s)
    10 Kb 5' upstream gene genomic sequence study
    MAPPING cloned Y linked N status confirmed
    RNA
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    2 - 3978 - 394 - 1998 9721223
    EXPRESSION
    Type widely
       expressed in (based on citations)
    organ(s)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Cardiovascularheart     Homo sapiens
    Endocrineadrenal glandcortex  highly
    Nervousbrainhindbraincerebellum   Homo sapiens
     spinal cordanterior horn    Homo sapiens
    Reproductivefemale systemuterus   
     male systemprostate   
    Urinarykidney    
    tissue
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    Connectiveadiposebrown   Homo sapiens
    cells
    SystemCellPubmedSpeciesStageRna symbol
    Nervousneuron Homo sapiens
    Nervousoligodendrocyte Homo sapiens
    cell lineage
    cell lines
    fluid/secretion
    at STAGE
    physiological period pregnancy
    Text highly, in placenta, and in myometrium from pregnant women
    PROTEIN
    PHYSICAL PROPERTIES
    STRUCTURE
    motifs/domains
  • four transmembrane segments
  • two pore forming regions (P domains) arranged like a tandem
  • an extended external loop M1P1 with intracellular N and C termini, of outward rectifier channels (open acid sensitive two P domains channel)
  • C-terminal residues are critical for KCNK3 endocytosis and define a novel K+ channel endocytic signal
  • conjugated GlycoP
    mono polymer homomer , dimer
    HOMOLOGY
    Homologene
    FAMILY
  • two pore domain potassium channel (tc 1.a.1.8) family
  • potassium channel, subfamily K
  • CATEGORY transport channel
    SUBCELLULAR LOCALIZATION extracellular
        plasma membrane
    basic FUNCTION
  • potassium non voltage-gated heat activated background channel outwardly rectifying
  • acting as an outward rectifier when external potassium concentration is low; when external potassium concentration is high, current is inward
  • playing an important role in mediating pulmonary vascular responses to changes in extracellular pH, and in the regulation of pulmonary vascular tone
  • play a key role in modulating effector functions of T lymphocytes
  • may serve as molecular sensors for central chemoreception because they are highly expressed in multiple neuronal populations in the respiratory pathway and contribute to their pH sensitivity
  • controls the resting membrane potential in humanpulmonary artery smooth muscle cells (PASMCs), and renders these cells sensitive to a variety of vasoactive factors
  • regulate neuronal firing and may contribute to the specialized responses of orexin neurons to glucose and pH
  • role in enhancing neuronal excitability and promoting high-frequency firing, but KCNK3/KCNK9 subunits are not essential for orexin cell responses to glucose and pH
  • plays a functional role in the repolarization of the cardiac action potential and contributes to the maintenance of heart rate variability (HRV)
  • is vital for setting the resting membrane potential and is the primary target for volatile anesthetics
  • plays a major role in a number of physiological functions throughout the CNS and periphery, and mechanisms that alter KCNK3 function and availability are likely to have a significant systemic impact
  • role potential for KCNK3 to uniquely contribute to synaptic plasticity
  • acid-sensitive KCNK1, KCNK3, KCNK9 change ion selectivity and become permeable to sodium in extracellular acidification
  • K(+) leak channel that mediates hypoxic depolarisation in neurons
  • oligodendrocytes express functional KCNK3 channels which contribute to oligodendrocyte damage in hypoxia
  • is an important modulator of membrane voltage and Ca(2+) entry
  • important role for KCNK3 channels in limiting pancreatic alpha-cell excitability and glucagon secretion during glucose stimulation
  • controls the thermogenic activity in brown adipocytes through modulation of ADRB signaling
  • CELLULAR PROCESS
    PHYSIOLOGICAL PROCESS
    text ion transport
    PATHWAY
    metabolism
    signaling
    a component
  • heterodimerizing with KCNK9
  • INTERACTION
    DNA
    RNA
    small molecule
    protein
  • cooperative action of KCNK3 and NADPH oxidase-4 (NOX4) mediated the O2-sensitive K+ current response
  • interacting with EDN1 (may exert its vasoconstrictive effects in part by targeting KCNK3, which might represent a novel pathologic mechanism related to pulmonary arterial hypertension)
  • YWHAB is absolutely required for KCNK3 internalization, a role heretofore not described for a 14-3-3 protein
  • is subject to dynamic PRKCA-regulated endocytic trafficking that is YWHAB-dependent
  • STX8 interacts with the acid-sensitive potassium channel KCNK3, and regulates the endocytosis of KCNK3
  • cell & other
    REGULATION
    Other controlled by the binding of 14-3-3 proteins to a trafficking control region at the extreme C-terminus of the channels
    ASSOCIATED DISORDERS
    corresponding disease(s) PPH4
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    constitutional     --low loss of function
    in pulmonary artery smooth muscle cells and endothelial cell
    Susceptibility
    Variant & Polymorphism
    Candidate gene
    Marker
    Therapy target
    SystemTypeDisorderPubmed
    cardiovascularrythm 
    promising drug targets against atrial fibrillation, the most common arrhythmia in the elderly
    ANIMAL & CELL MODELS
  • disruption of the TASK1 gene in mice resulted in an autonomous aldosterone production and caused a remarkable aberrant expression of aldosterone synthase in zona fasciculata cells that normally produce glucocorticoids
  • Task1-null mice, compared with their controls, became overweight, mainly because of an increase in white adipose tissue mass and BAT whitening