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MGP002766

UniProt Annotations

Entry Information
Gene Namesodium channel, non voltage gated 1 alpha subunit
Protein EntrySCNNA_HUMAN
UniProt IDP37088
SpeciesHuman
Comments
Comment typeDescription
Alternative ProductsEvent=Alternative splicing; Named isoforms=6; Name=1; Synonyms=Alpha ENAC1; IsoId=P37088-1; Sequence=Displayed; Name=2; Synonyms=Alpha ENAC2; IsoId=P37088-2; Sequence=VSP_007719; Name=3; Synonyms=Alpha ENACx; IsoId=P37088-3; Sequence=VSP_007720, VSP_007721; Note=Does not give rise to amiloride-sensitive ion current. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay.; Name=4; Synonyms=Alpha ENAC-19; IsoId=P37088-4; Sequence=VSP_007722; Note=Amiloride-sensitive ion current is nearly abolished.; Name=5; Synonyms=Alpha ENAC+22; IsoId=P37088-5; Sequence=VSP_007723; Note=Does not give rise to amiloride-sensitive ion current.; Name=6; IsoId=P37088-6; Sequence=VSP_043667; Note=No experimental confirmation available.;
DiseaseBronchiectasis with or without elevated sweat chloride 2 (BESC2) [MIM:613021]: A debilitating respiratory disease characterized by chronic, abnormal dilatation of the bronchi and other cystic fibrosis-like symptoms in the absence of known causes of bronchiectasis (cystic fibrosis, autoimmune diseases, ciliary dyskinesia, common variable immunodeficiency, foreign body obstruction). Clinical features include sub-normal lung function, sinopulmonary infections, chronic productive cough, excessive sputum production, and elevated sweat chloride in some cases. {ECO:0000269|PubMed:19462466}. Note=The disease is caused by mutations affecting the gene represented in this entry.
DiseasePseudohypoaldosteronism 1, autosomal recessive (PHA1B) [MIM:264350]: A rare salt wasting disease resulting from target organ unresponsiveness to mineralocorticoids. PHA1B is a severe form involving multiple organ systems, and characterized by an often fulminant presentation in the neonatal period with dehydration, hyponatremia, hyperkalemia, metabolic acidosis, failure to thrive and weight loss. {ECO:0000269|PubMed:10586178, ECO:0000269|PubMed:15853823, ECO:0000269|PubMed:18634878}. Note=The disease is caused by mutations affecting the gene represented in this entry. The degree of channel function impairment differentially affects the renin-aldosterone system and urinary Na/K ratios, resulting in distinct genotype-phenotype relationships in PHA1 patients. Loss-of-function mutations are associated with a severe clinical course and age-dependent hyperactivation of the renin-aldosterone system. This feature is not observed in patients with missense mutations that reduce but do not eliminate channel function. Markedly reduced channel activity results in impaired linear growth and delayed puberty (PubMed:18634878). {ECO:0000269|PubMed:18634878}.
Enzyme RegulationActivated by WNK1, WNK2, WNK3 and WNK4. {ECO:0000250}.
FunctionSodium permeable non-voltage-sensitive ion channel inhibited by the diuretic amiloride. Mediates the electrodiffusion of the luminal sodium (and water, which follows osmotically) through the apical membrane of epithelial cells. Plays an essential role in electrolyte and blood pressure homeostasis, but also in airway surface liquid homeostasis, which is important for proper clearance of mucus. Controls the reabsorption of sodium in kidney, colon, lung and sweat glands. Also plays a role in taste perception. {ECO:0000269|PubMed:24124190}.
InductionBy aldosterone. {ECO:0000269|PubMed:11266509}.
PtmENaC cleavage by furin, and subsequently by prostasin (PRSS8), leads to a stepwise increase in the open probability of the channel as a result of release of the alpha and gamma subunit inhibitory tracts, respectively. Interaction of ENaC subunit SCNN1B with BPIFA1 protects ENaC against proteolytic activation. {ECO:0000269|PubMed:18650438}.
PtmUbiquitinated; this targets individual subunits for endocytosis and proteasome-mediated degradation. {ECO:0000250}.
Sequence CautionSequence=AAH06526.2; Type=Erroneous initiation; Note=Translation N-terminally shortened.; Evidence={ECO:0000305};
SimilarityBelongs to the amiloride-sensitive sodium channel (TC 1.A.6) family. SCNN1A subfamily. {ECO:0000305}.
Subcellular LocationApical cell membrane; Multi-pass membrane protein. Cell projection, cilium. Note=In the oviduct and bronchus, located on cilia in multi-ciliated cells. In endometrial non-ciliated epithelial cells, restricted to apical surfaces.
SubunitProbable heterotrimer containing one alpha, one beta and one gamma subunit. A delta subunit can replace the alpha subunit. Interacts with the WW domains of NEDD4, NEDD4L, WWP1 and WWP2. Interacts with the full length immature form of PCSK9 (pro-PCSK9). {ECO:0000269|PubMed:11244092, ECO:0000269|PubMed:11696533, ECO:0000269|PubMed:12167593, ECO:0000269|PubMed:22493497, ECO:0000269|PubMed:24124190, ECO:0000269|PubMed:9169421}.
Tissue SpecificityExpressed in the female reproductive tract, from the fimbrial end of the fallopian tube to the endometrium (at protein level). Expressed in kidney (at protein level). In the respiratory tract, expressed in the bronchial epithelium (at protein level). Highly expressed in lung. Detected at intermediate levels in pancreas and liver, and at low levels in heart and placenta. Isoform 1 and isoform 2 predominate in all tissues. Expression of isoform 3, isoform 4 and isoform 5 is very low or not detectable, except in lung and heart. {ECO:0000269|PubMed:22207244, ECO:0000269|PubMed:9575806}.
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