Contributes to cation channel activity and sour taste receptor activity. Involved in cation transport; cellular response to acidic pH; and detection of chemical stimulus involved in sensory perception of sour taste. Part of cation channel complex and receptor complex. Colocalizes with cell surface. Is expressed in circumvallate papilla; cochlea; foliate papillae; and testis. Orthologous to human PKD1L3 (polycystin 1 like 3, transient receptor potential channel interacting). [provided by Alliance of Genome Resources, Apr 2022]