FUNCTION: Pore-forming subunit of a voltage-gated ion channel required for sensory perception of sweet, bitter and umami tastes (By similarity). Specifically present in type II taste bud cells, where it plays a central role in sweet, bitter and umami taste perception by inducing ATP release from the...
FUNCTION: Pore-forming subunit of a voltage-gated ion channel required for sensory perception of sweet, bitter and umami tastes (By similarity). Specifically present in type II taste bud cells, where it plays a central role in sweet, bitter and umami taste perception by inducing ATP release from the cell, ATP acting as a neurotransmitter to activate afferent neural gustatory pathways (By similarity). Together with CALHM3, forms a fast-activating voltage-gated ATP-release channel in type II taste bud cells (TBCs) (By similarity). Acts both as a voltage-gated and calcium-activated ion channel: mediates neuronal excitability in response to changes in extracellular Ca(2+) concentration (PubMed:22711817, PubMed:23300080). Has poor ion selectivity and forms a wide pore (around 14 Angstroms) that mediates permeation of Ca(2+), Na(+) and K(+), as well as permeation of monovalent anions (PubMed:22711817). Acts as an activator of the ERK1 and ERK2 cascade (PubMed:23345406). Triggers endoplasmic reticulum stress by reducing the calcium content of the endoplasmic reticulum (PubMed:21574960). May indirectly control amyloid precursor protein (APP) proteolysis and aggregated amyloid-beta (Abeta) peptides levels in a Ca(2+) dependent manner (PubMed:18585350). {ECO:0000250|UniProtKB:D3Z291, ECO:0000269|PubMed:18585350, ECO:0000269|PubMed:21574960, ECO:0000269|PubMed:22711817, ECO:0000269|PubMed:23300080, ECO:0000269|PubMed:23345406}.
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GO - Biological processes (BP):
ATP transport [GO:0015867]; cation transport [GO:0006812]; protein heterooligomerization [GO:0051291]; protein homooligomerization [GO:0051260]; regulation of ion transmembrane transport [GO:0034765]; response to stimulus [GO:0050896]; sensory perception of bitter taste [GO:0050913]; sensory percept...
ATP transport [GO:0015867]; cation transport [GO:0006812]; protein heterooligomerization [GO:0051291]; protein homooligomerization [GO:0051260]; regulation of ion transmembrane transport [GO:0034765]; response to stimulus [GO:0050896]; sensory perception of bitter taste [GO:0050913]; sensory perception of sweet taste [GO:0050916]; sensory perception of umami taste [GO:0050917]
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GO - Molecular function (MF):
calcium activated cation channel activity [GO:0005227]; cation channel activity [GO:0005261]; identical protein binding [GO:0042802]; voltage-gated calcium channel activity [GO:0005245]; voltage-gated ion channel activity [GO:0005244]...
calcium activated cation channel activity [GO:0005227]; cation channel activity [GO:0005261]; identical protein binding [GO:0042802]; voltage-gated calcium channel activity [GO:0005245]; voltage-gated ion channel activity [GO:0005244]
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GO - Cellular component (CC):
basolateral plasma membrane [GO:0016323]; endoplasmic reticulum membrane [GO:0005789]; integral component of plasma membrane [GO:0005887]...
basolateral plasma membrane [GO:0016323]; endoplasmic reticulum membrane [GO:0005789]; integral component of plasma membrane [GO:0005887]
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