Enables protein N-terminus binding activity. Involved in response to calcium ion. Predicted to be located in several cellular components, including extracellular space; photoreceptor outer segment; and stereocilium. Predicted to be integral component of plasma membrane. Human ortholog(s) of this gene implicated in Usher syndrome type 1D; Usher syndrome type 1F; and autosomal recessive nonsyndromic deafness 23. Orthologous to human PCDH15 (protocadherin related 15). [provided by Alliance of Genome Resources, Apr 2022]