[molecular_function] copper ion binding <sep> identical protein binding <sep> phosphatidic acid binding <sep> phosphatidylinositol-3,4,5-trisphosphate binding <sep> phosphatidylinositol-3,4-bisphosphate binding <sep> phosphatidylinositol-3,5-bisphosphate binding <sep> phosphatidylinositol-4,5-bisphosphate binding <sep> protein homodimerization activity <sep> sodium channel inhibitor activity