Enables myosin tail binding activity. Predicted to be involved in several processes, including brush border assembly; photoreceptor cell maintenance; and sensory organ development. Predicted to act upstream of or within neuromuscular process controlling balance and parallel actin filament bundle assembly. Located in several cellular components, including photoreceptor inner segment; photoreceptor outer segment; and stereocilium. Human ortholog(s) of this gene implicated in Usher syndrome; Usher syndrome type 1; Usher syndrome type 1C; and autosomal recessive nonsyndromic deafness 18A. Orthologous to human USH1C (USH1 protein network component harmonin). [provided by Alliance of Genome Resources, Apr 2022]