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FLASH GENE
Symbol KCNE4 contributors: mct - updated : 08-06-2011
HGNC name potassium voltage-gated channel, Isk-related family, member 4
HGNC id 6244
Location 2q36.1      Physical location : 223.916.861 - 223.920.353
Synonym name
  • MINK-related peptide 3
  • minimum potassium ion channel-related peptide 3
    • Synonym symbol(s) MGC20353, MIRP3
    DNA
    TYPE functioning gene
    SPECIAL FEATURE component of a cluster
    STRUCTURE 3.49 kb     2 Exon(s)
    10 Kb 5' upstream gene genomic sequence study
    regulatory sequence Promoter (CAAT box) (TATA box)
    Binding site   transcription factor
    text structure binding sites for MYOD1, E4F1, USF1
    MAPPING cloned Y linked N status provisional
    RNA
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    2 - 2976 - 170 - 2003 12670483
    EXPRESSION
    Type
       expressed in (based on citations)
    organ(s)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Cardiovascularheart   highly
    Digestiveliver   predominantly Homo sapiens
    Nervousbrain   predominantly Homo sapiens
    Reproductivefemale systemovary   
     male systemtestis  predominantly Homo sapiens
     male systemprostate   
    Urinarykidney   highly
    tissue
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    Muscularstriatumskeletal  
    cell lineage
    cell lines
    fluid/secretion
    at STAGE
    physiological period pregnancy
    Text moderately in placenta
    PROTEIN
    PHYSICAL PROPERTIES
    STRUCTURE
    motifs/domains
  • a glycosylation site
  • a transmembrane domain
  • a cytoplasmic domain of KCNE4 that is necessary for its inhibition of KCNQ1
  • a tetraleucine motif in the juxtamembrane region of the C terminus , interacting with KCNQ1
    • mono polymer heteromer , complex
    HOMOLOGY
    interspecies ortholog to murine Kcne4
    intraspecies homolog to KCNE1
    Homologene
    FAMILY potassium channel E family
    CATEGORY regulatory , transport channel
    SUBCELLULAR LOCALIZATION     plasma membrane
    text type I membrane protein
    basic FUNCTION
  • ancillary protein modulating the gating kinetics and enhance stability of the multimeric complex
  • inhibiting potassium current by inhibiting KCNQ1 activation
  • may act as a subunit of KCNJ2 channel to modulate the potassium channel function
  • functions as an inhibitory KCNA3 partner in leukocytes
  • KCNE4 association might play a crucial role in controlling immunological responses
    • CELLULAR PROCESS
    PHYSIOLOGICAL PROCESS facilitated diffusion transport
    PATHWAY
    metabolism
    signaling
    a component
  • potassium channel alpha subunit, like KCNQ1
  • directly associates with KCNQ1, and can co-associate together with KCNE1 in the same KCNQ1 complex to form a 'triple subunit' complex (KCNE1-KCNQ1-KCNE4)
    • INTERACTION
    DNA
    RNA
    small molecule
    protein
  • may coassemble with KCNQ subunits
  • has a dramatic inhibitory effect on KCNQ1 that differs substantially from the activating effects of KCNE1 and KCNE3
  • associates with KCNA3 in the ER and decreases the number of KCNA3 channels at the cell surface, which diminishes cell excitability
  • modulate KCND current activation, inactivation and recovery from inactivation, in a KCNIP2-dependent manner
  • can biochemically interact with CALM1 and this interaction is Ca(2+)-dependent and requires a tetraleucine motif in the juxtamembrane region of the KCNE4 C terminus
  • interaction between KCNE4 and CALM1 could be involved in the modulation of KCNQ1 by KCNE4
  • CALM1-KCNE4 interactions might constitute part of a feedback loop for regulating intracellular Ca2+
    • cell & other
    REGULATION
    ASSOCIATED DISORDERS
    ANIMAL & CELL MODELS