LRPAP1, also known as alpha-2-macroglobulin receptor-associated protein, belongs to the alpha-2- MRAP family. This protein interacts with LRP1/alpha-2-macroglobulin receptor and glycoprotein 330. It is present on the cell surface forming a complex with the alpha 2 macroglobulin receptor heavy and light chains In complex with the alpha 2 MR or gp330, it may have some role in the pathogenesis of membrane glomerular nephritis.