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CD46 (MCP, membrane cofactor protein) is a multifunctional cell surface transmembrane protein that binds and inactivates C3b and C4b complement fragments, regulates T cell-induced inflammatory responses by either inhibiting (CD46-1 isoform) or increasing (CD46-2 isoform) the contact hypersensitivity reaction. CD46 also serves as a receptor for several human pathogens (both bacteria and viruses), and its ligation alteres T lymphocyte polarization toward antigen-presenting cells or target cells, inhibiting lymphocyte function. CD46 is a protector of placental tissue and is also expressed on the inner acrosomal membrane of spermatozoa.
Protein Aliases: antigen identified by monoclonal antibody TRA-2-10; CD46; CD46 antigen, complement regulatory protein; CD46 molecule, complement regulatory protein; complement membrane cofactor protein; measles virus receptor; Membrane cofactor protein; membrane cofactor protein (CD46, trophoblast-lymphocyte cross-reactive antigen); MGC26544; TLX; trophoblast leucocyte common antigen; Trophoblast leukocyte common antigen; trophoblast-lymphocyte cross-reactive antigen
Gene Aliases: AHUS2; CD46; MCP; MIC10; TLX; TRA2.10