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. 1990 Jun;70(2):155–161.

The human cell-surface glycoproteins HuLy-m5, membrane co-factor protein (MCP) of the complement system, and trophoblast leucocyte-common (TLX) antigen, are CD46.

D F Purcell 1, I F McKenzie 1, D M Lublin 1, P M Johnson 1, J P Atkinson 1, T J Oglesby 1, N J Deacon 1
PMCID: PMC1384186  PMID: 2373515

Abstract

The non-lineage restricted human CD46 antigen, with two glycoproteins of 56,000 molecular weight (MW) and 66,000 MW, was defined using a panel of monoclonal antibodies (mAb) that included the E4.3 mAb to the HuLy-m5 antigen. Here the E4.3 mAb is used to show that two other human cell-surface molecules, membrane co-factor protein (MCP) of the complement system and trophoblast leucocyte-common antigen (TLX), are the same as HuLy-m5; thus, these three independently identified molecules are equivalently CD46. A mouse mAb to TLX (H316) and a specific rabbit antiserum to purified MCP (RA-MCP) blocked the binding of FITC-labelled E4.3 to the surface of human peripheral blood leucocytes (PBL). In sequential immunoprecipitation studies, E4.3 cleared all molecules detected by H316 and the RA-MCP antiserum. Immunoprecipitation from Chinese hamster ovary cells expressing transfected MCP cDNA showed that E4.3 detects both the mature 66,000 higher MW form of MCP and its 48,000 MW pro-MCP precursor, which lacks O-linked carbohydrate and bears only simple high-mannose-type N-linked carbohydrate. The IgG fraction of a polyclonal antiserum to purified MCP blocked factor I-mediated cleavage of C3b, whereas the E4.3 mAb did not. These data establish that three independently identified antigen systems are indeed the same: HuLy-m5, which shares a cross-reactive epitope with some primate retroviral gp 70 molecules and can be physically associated with class I major histocompatibility complex (MHC) chains in the cell membrane; MCP, of interest as a member of the regulators of complement activation gene family thought to protect autologous cells from complement activation; and TLX, a polymorphic molecule of interest for its potential role at the foeto-maternal tissue interface during pregnancy. Thus, the human CD46 antigen amalgamates the HuLy-m5, MCP and TLX cell-membrane glycoproteins.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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