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0SCNNB_HUMAN*   SwissProt (?) | Description Local Annotation Link Reference
General Information
NameSCNN1B
DescriptionAmiloride-sensitive sodium channel beta-subunit (epithelial na+ channel beta subunit) (beta enac) (nonvoltage-gated sodium channel 1 beta subunit) (scneb) (beta nach) (enacb).
SpeciesHomo sapiens (NCBI taxonomy ID: 9606)
GO0015280 amiloride-sensitive sodium channel activity (TAS)
0005515 protein binding (IPI)
0007588 excretion (TAS)
0006814 sodium 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 unassigned to SynO:
The apical membrane of many tight epithelia contains sodium channels thatare primarily characterised by their high affinity to the diuretic blockeramiloride . These channels mediate the first step of active sodiumreabsorption essential for the maintenance of body salt and waterhomeostasis . In vertebrates.he channels control reabsorption ofsodium in kidney.olon.ung and sweat glands; they also play a role intaste perception.Members of the epithelial Na+ channel (ENaC) family fall into foursubfamilies.ermed alpha.eta.amma and delta . The proteins exhibitthe same apparent topology.ach with two transmembrane (TM) spanningsegments.eparated by a large extracellular loop. In most ENaC proteinsstudied to date.he extracellular domains are highly conserved and containnumerous cysteine residues.ith flanking C-terminal amphipathic TM regions.ostulated to contribute to the formation of the hydrophilic pores of theoligomeric channel protein complexes. It is thought that the well-conservedextracellular domains serve as receptors to control the activities of thechannels.Vertebrate ENaC proteins are similar to degenerins of Caenorhabditis elegans: deg-1.el-1.ec-4.ec-10 and unc-8. These proteins can be mutated to cause neuronal degradation.nd are also thought to form sodium channels.Structurally.he proteins that belong to this family consist of about 510to 920 amino acid residues. They are made of an intracellular N-terminusregion followed by a transmembrane domain. large extracellular loop.second transmembrane segment and a C-terminal intracellular tail .
  IPR001873:Na+ channel, amiloride-sensitive
The epithelial Na+ channel (ENaC) proteins consist of sodium channels from animals and has no recognizable homologues in other eukaryotes or bacteria. The vertebrate ENaC proteins from epithelial cells cluster tightly together on the phylogenetic tree: voltage-insensitive ENaC homologues are also found in the brain. Eleven sequenced Caenorhabditis elegans proteins.ncluding the degenerins ().re distantly related to the vertebrate proteins as well as to each other. At least some of the proteins in this group form part of a mechano-transducing complex for touch sensitivity. Others include the acid-sensing ion channels.SIC1-3 that are homo- or hetero-oligomeric neuronal H+-gated channels that mediate pain sensation in response to tissue acidosis. Mammalian ENaC is important for the maintenance of Na+ balance and the regulation of blood pressure. Three homologous ENaC subunits.. and g.ave been shown to assemble to form the highly Na+-selective channel.
  IPR004724:Epithelial sodium channel
IPR001873:ASC 
Evalue:-245.508636474609 
Location:29-544
SequencesProtein: SCNNB_HUMAN (640 aa)
mRNA: NM_000336
Local Annotation
Synapse Ontology
Na channel plays an important role in the course of action potential.
sdb:0287 Na channel  (Evidence:keywords)
KO assignmentK04825
  Level 3 annotation:
    sodium channel, nonvoltage-gated 1, beta (Liddle syndrome)
  Level 2 annotation:
    Ion channels
Loci Structure (Details)Loci index, Chromosomal location, Length, Possible relational loci clusterExon1: 40 residues, 23221140-23221259Exon2: 108 residues, 23267413-23267732Exon3: 93 residues, 23271622-23271896Exon4: 65 residues, 23274120-23274311Exon5: 36 residues, 23286677-23286781Exon6: 56 residues, 23290120-23290284Exon7: 38 residues, 23290597-23290705Exon8: 41 residues, 23294559-23294677Exon9: 27 residues, 23295986-23296062Exon10: 21 residues, 23296150-23296208Exon11: 22 residues, 23297527-23297589Exon12: 27 residues, 23298915-23298991Exon13: 293 residues, 23299242-23300117Exon14: 2 residues, -Jump to SCNNB_HUMAN  
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Loci Cluster (Details)Loci: 2928 23221140-23300117 ~-79K 13712(SCNN1B)(+)Loci: 4213 23383144-23429309 ~-46K 13715(GGA2)(-)Loci: 2927 23101540-23135701 ~-34K 13711(SCNN1G)(+)Link out to UCSC