May play a role in cholesterol transfer to late endosomes (By similarity). May play a role in modulating membrane acid-sensing ion channels. Can specifically inhibit proton-gated current of ASIC1 isoform 1. Can increase inactivation speed of ASIC3. May be involved in regulation of proton sensing in dorsal root ganglions (PubMed:24247984). Interacts with STOM; may redistribute STOM from the plasma membrane to late endosomes. Expressed in dorsal root ganglion neurons. Belongs to the band 7/mec-2 family.