Enables low-density lipoprotein particle receptor binding activity; molecular adaptor activity; and protein N-terminus binding activity. Involved in inner ear development and positive regulation of ion transmembrane transport. Located in apical plasma membrane and nucleus. Part of protein-containing complex. Biomarker of hypertension. Orthologous to human SLC9A3R2 (SLC9A3 regulator 2). [provided by Alliance of Genome Resources, Apr 2022]