Acid-sensing ion channel 1

NameAcid-sensing ion channel 1
Synonyms
  • ACCN2
  • Amiloride-sensitive cation channel 2, neuronal
  • ASIC1
  • BNAC2
  • Brain sodium channel 2
Gene NameASIC1
OrganismHuman
Amino acid sequence
>lcl|BSEQ0036997|Acid-sensing ion channel 1
MELKAEEEEVGGVQPVSIQAFASSSTLHGLAHIFSYERLSLKRALWALCFLGSLAVLLCV
CTERVQYYFHYHHVTKLDEVAASQLTFPAVTLCNLNEFRFSQVSKNDLYHAGELLALLNN
RYEIPDTQMADEKQLEILQDKANFRSFKPKPFNMREFYDRAGHDIRDMLLSCHFRGEVCS
AEDFKVVFTRYGKCYTFNSGRDGRPRLKTMKGGTGNGLEIMLDIQQDEYLPVWGETDETS
FEAGIKVQIHSQDEPPFIDQLGFGVAPGFQTFVACQEQRLIYLPPPWGTCKAVTMDSDLD
FFDSYSITACRIDCETRYLVENCNCRMVHMPGDAPYCTPEQYKECADPALDFLVEKDQEY
CVCEMPCNLTRYGKELSMVKIPSKASAKYLAKKFNKSEQYIGENILVLDIFFEVLNYETI
EQKKAYEIAGLLGDIGGQMGLFIGASILTVLELFDYAYEVIKHKLCRRGKCQKEAKRSSA
DKGVALSLDDVKRHNPCESLRGHPAGMTYAANILPHHPARGTFEDFTC
Number of residues528
Molecular Weight59908.915
Theoretical pI5.39
GO Classification
Functions
  • ligand-gated sodium channel activity
  • acid-sensing ion channel activity
  • ion gated channel activity
Processes
  • sodium ion transport
  • regulation of membrane potential
  • response to acidic pH
  • response to pH
  • sensory perception of sour taste
  • sodium ion transmembrane transport
  • transmembrane transport
  • ion transmembrane transport
  • calcium ion transmembrane transport
  • associative learning
  • memory
  • protein homotrimerization
  • transport
  • cellular response to pH
  • signal transduction
  • negative regulation of neurotransmitter secretion
Components
  • plasma membrane
  • cell surface
  • integral component of plasma membrane
General FunctionLigand-gated sodium channel activity
Specific FunctionIsoform 2 and isoform 3 function as proton-gated sodium channels; they are activated by a drop of the extracellular pH and then become rapidly desensitized. The channel generates a biphasic current with a fast inactivating and a slow sustained phase. Has high selectivity for sodium ions and can also transport lithium ions with high efficiency. Isoform 2 can also transport potassium, but with lower efficiency. It is nearly impermeable to the larger rubidium and cesium ions. Isoform 3 can also transport calcium ions. Mediates glutamate-independent Ca(2+) entry into neurons upon acidosis. This Ca(2+) overloading is toxic for cortical neurons and may be in part responsible for ischemic brain injury. Heteromeric channel assembly seems to modulate channel properties. Functions as a postsynaptic proton receptor that influences intracellular Ca(2+) concentration and calmodulin-dependent protein kinase II phosphorylation and thereby the density of dendritic spines. Modulates activity in the circuits underlying innate fear.Isoform 1 does not display proton-gated cation channel activity.
Pfam Domain Function
Transmembrane Regions46-69 428-454
GenBank Protein ID1871168
UniProtKB IDP78348
UniProtKB Entry NameASIC1_HUMAN
Cellular LocationCell membrane
Gene sequence
>lcl|BSEQ0010105|Acid-sensing ion channel 1 (ASIC1)
ATGGAACTGAAGGCCGAGGAGGAGGAGGTGGGTGGCGTCCAGCCGGTGAGCATCCAGGCC
TTCGCCAGCAGCTCCACACTGCACGGCCTGGCCCACATCTTCTCCTACGAGCGGCTGTCT
CTGAAGCGGGCACTGTGGGCCCTGTGCTTCCTGGGCTCGCTGGCTGTGCTGCTGTGTGTG
TGCACGGAGCGTGTGCAGTACTACTTCCACTACCACCATGTCACCAAGCTCGACGAGGTG
GCTGCCTCTCAGCTTACCTTCCCTGCTGTCACGCTGTGCAACCTCAACGAGTTCCGCTTT
AGCCAAGTCTCCAAGAATGACCTGTATCATGCTGGGGAGCTGCTGGCCCTGCTCAACAAC
AGGTATGAGATACCAGACACACAGATGGCAGATGAAAAGCAGCTGGAGATACTGCAGGAC
AAAGCCAACTTCCGCAGCTTCAAACCCAAACCCTTCAACATGCGTGAGTTCTACGACCGA
GCTGGGCACGACATTCGAGACATGCTGCTCTCCTGCCACTTCCGGGGGGAGGTCTGCAGC
GCTGAAGACTTCAAGGTGGTCTTCACACGCTATGGAAAGTGCTACACGTTCAACTCGGGC
CGAGATGGGCGGCCGCGGCTGAAGACCATGAAGGGTGGGACGGGCAATGGGCTGGAAATC
ATGCTGGACATCCAGCAGGACGAGTACCTGCCTGTGTGGGGGGAGACTGACGAGACGTCC
TTCGAAGCAGGCATCAAAGTGCAGATCCATAGTCAGGATGAACCTCCTTTCATCGACCAG
CTGGGCTTTGGCGTGGCCCCAGGCTTCCAGACCTTTGTGGCCTGCCAGGAGCAGCGGCTC
ATCTACCTGCCCCCACCCTGGGGCACCTGCAAAGCTGTTACCATGGACTCGGATTTGGAT
TTCTTCGACTCCTACAGCATCACTGCCTGCCGCATCGACTGTGAGACGCGCTACCTGGTG
GAGAACTGCAACTGCCGCATGGTGCACATGCCAGGGGATGCCCCATACTGTACTCCAGAG
CAGTACAAGGAGTGTGCAGATCCTGCTCTGGACTTCCTGGTGGAGAAGGACCAGGAGTAC
TGCGTGTGTGAAATGCCTTGCAACCTGACCCGCTATGGCAAAGAGCTGTCCATGGTCAAG
ATCCCCAGCAAAGCCTCAGCCAAGTACCTGGCCAAGAAGTTCAACAAATCTGAGCAATAC
ATAGGGGAGAACATCCTGGTGCTGGACATTTTCTTTGAAGTCCTCAACTATGAGACCATT
GAACAGAAGAAGGCCTATGAGATTGCAGGGCTCCTGGGTGACATCGGGGGCCAGATGGGG
CTGTTCATCGGGGCCAGCATCCTCACGGTGCTGGAGCTCTTTGACTACGCCTACGAGGTC
ATTAAGCACAAGCTGTGCCGACGAGGAAAATGCCAGAAGGAGGCCAAAAGGAGCAGTGCG
GACAAGGGCGTGGCCCTCAGCCTGGACGACGTCAAAAGACACAACCCGTGCGAGAGCCTT
CGGGGCCACCCTGCCGGGATGACATACGCTGCCAACATCCTACCTCACCATCCGGCCCGA
GGCACGTTCGAGGACTTTACCTGCTGA
GenBank Gene IDU78180
GeneCard IDNot Available
GenAtlas IDACCN2
HGNC IDHGNC:100
Chromosome Location12
Locus12q12
References
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  2. Hoagland EN, Sherwood TW, Lee KG, Walker CJ, Askwith CC: Identification of a calcium permeable human acid-sensing ion channel 1 transcript variant. J Biol Chem. 2010 Dec 31;285(53):41852-62. doi: 10.1074/jbc.M110.171330. Epub 2010 Oct 29. 21036899
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