Protein-coding gene in the species Homo sapiens
Voltage-gated hydrogen channel 1 is aprotein that in humans is encoded by theHVCN1 gene .
Voltage-gated hydrogen channel 1 is avoltage-gated proton channel that has been shown to allow proton transport intophagosomes [ 5] [ 6] and out of many types of cells includingspermatozoa ,electrically excitable cells andrespiratory epithelial cells.[ 7] The proton-conducting HVCN1 channel has only transmembrane domains corresponding to the S1-S4 voltage sensing domains (VSD) ofvoltage-gated potassium channels andvoltage-gated sodium channels .[ 8] Molecular simulation is consistent with a water-filled pore that can function as a "water wire " for allowing hydrogen bonded H+ to cross the membrane.[ 9] [ 10] However, mutation of Asp112 in human Hv1 results in anion permeation, suggesting that obligatory protonation of Asp produces proton selectivity.[ 11] Quantum mechanical calculations show that the Asp-Arg interaction can produce proton selective permeation.[ 12] The HVCN1 protein has been shown to exist as a dimer with two functioning pores.[ 13] [ 14] Like other VSD channels, HVCN1 channels conduct ions about 1000-fold slower than channels formed by tetrameric S5-S6 central pores.[ 15]
Small molecule inhibitors of the HVCN1 channel are being developed aschemotherapeutics andanti-inflammatory agents.[ 16]
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