Protein: Proton channel OTOP1 (Q7RTM1)
Organism: Homo sapiens (Human)
Function: Proton-selective channel that specifically transports protons into cells. Proton channel activity is only weakly- sensitive to voltage (By similarity). Proton-selective channel activity is probably required in cell types that use changes in intracellular pH for cell signaling or to regulate biochemical or developmental processes. In the vestibular system of the inner ear, required for the formation and function of otoconia, which are calcium carbonate crystals that sense gravity and acceleration (By similarity). Probably acts by maintaining the pH appropriate for formation of otoconia (By similarity). Regulates purinergic control of intracellular calcium in vestibular supporting cells (By similarity). May be involved in sour taste perception in sour taste cells by mediating entry of protons within the cytosol (By similarity). Also involved in energy metabolism, by reducing adipose tissue inflammation and protecting from obesity-induced metabolic dysfunction (By similarity)
Subcellular location: Cell membrane; Multi-pass membrane protein. Note=Detected in the gelatinous membrane overlying the inner ear macular epithelium
InterPro domains:
- IPR004878: Otopetrin (family) [30-611]
Sequence:
MLEGLGSPASPRAAASASVAGSSGPAACSPPSSSAPRSPESPAPRRGGVRASVPQKLAEMLSSQYGLIVFVAGLLLLLAWAVHAAGVSKSDLLCFLTALMLLQLLWMLWYVGRSSAHRRLFRLKDTHAGAGWLRGSITLFAVITVILGCLKIGYFIGFSECLSATEGVFPVTHSVHTLLQVYFLWGHAKDIIQSFKTLERFGVIHSVFTNLLLWANGVLNESKHQLNEHKERLITLGFGNITTVLDDHTPQCNCTPPTLCTAISHGIYYLYPFNIEYQILASTMLYVLWKNIGRKVDSHQHQKMQFKSDGVMVGAVLGLTVLAATIAVVVVYLIHIGRSKTKSESALIMFYLYAITLLMLMGAAGLAGIRIYRIDEKSLDESKNPARKLDSDLLVGTASGSWLISWGSILAILCAEGHPRYTWYNLPYSILAIVEKYIQNLFIFESIHREPEKLSEDIQTLRVVTVCNGNTMPLASSCPKSGGVARDVAPQGKDMPPAANGNVCMRESHDKEEEKQEESSWGGSPSPVRLPRFLQGNAKRKVLRNIAAFLFLCNISLWIPPAFGCRPEYDNGLEEIVFGFEPWIIVVNLAMPFSIFYRMHAAASLFEVYCKI
Predicted GO terms:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005215 (transporter activity), GO:0022857 (transmembrane transporter activity), GO:0015075 (monoatomic ion transmembrane transporter activity), GO:0022803 (passive transmembrane transporter activity), GO:0015318 (inorganic molecular entity transmembrane transporter activity), GO:0005216 (monoatomic ion channel activity), GO:0015267 (channel activity), GO:0022890 (inorganic cation transmembrane transporter activity), GO:0008324 (monoatomic cation transmembrane transporter activity), GO:0005261 (monoatomic cation channel activity), GO:0015078 (proton transmembrane transporter activity), GO:0015252 (proton channel activity)
Biological Process (BP): GO:0008150 (biological process), GO:0009987 (cellular process), GO:0051179 (localization), GO:0051234 (establishment of localization), GO:0055085 (transmembrane transport), GO:0098660 (inorganic ion transmembrane transport), GO:0006810 (transport), GO:0034220 (monoatomic ion transmembrane transport), GO:0098655 (monoatomic cation transmembrane transport), GO:0006811 (monoatomic ion transport), GO:0098662 (inorganic cation transmembrane transport), GO:0006812 (monoatomic cation transport), GO:1902600 (proton transmembrane transport)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0071944 (cell periphery), GO:0016020 (membrane), GO:0005886 (plasma membrane)