Component of the ankyrin-1 complex, a multiprotein complex involved in the stability and shape of the erythrocyte membrane . Mediates the primary membrane attachment site for ANK1 when associated with RHAG . May participate in the ammonium and carbon dioxide transport through the heterotrimer form (Probable).
Subcellular locations: Membrane
Restricted to tissues or cell lines expressing erythroid characters. Isoform 4g and isoform RhPI-Alpha are expressed in immature erythroblasts but not in mature erythroblasts.