Membrane Cofactor Protein (MCP; CD46): Isoform-Specific Tyrosine Phosphorylation

Isoform-Specific Tyrosine Phosphorylation Membrane Cofactor Protein (MCP; CD46):

Dissecting sites important for complement regulatory activity in membrane cofactor protein (MCP; CD46).

Membrane cofactor protein (MCP; CD46), a widely distributed regulator of complement activation, is a cofactor for the factor I-mediated degradation of C3b and C4b deposited on host cells. MCP possesses four extracellular, contiguous complement control protein modules (CCPs) important for this inhibitory activity. The goal of the present study was to delineate functional sites within these modul...

Complement-mediated tumor cell damage induced by antibodies against membrane cofactor protein (MCP, CD46)

We have developed polyclonal and monoclonal antibodies against human membrane cofactor protein (MCP) to use as tools to investigate the functions of MCP on intact nucleated cells. Two human T cell lines, CEM and TALL, are CR1- and DAF-. Pretreatment of these cell lines with M177 and polyclonal anti-MCP, which inhibit cofactor activity almost completely, resulted in effective C3 deposition immed...

Four viruses, two bacteria, and one receptor: membrane cofactor protein (CD46) as pathogens' magnet.

CD46 (also known as membrane cofactor protein or MCP) is a regulator of complement activation that is expressed in most or all human nucleated cell types. CD46 was initially identified as binding and inactivating C3b and C4b complement products, a process protecting human cells from lysis by autologous complement (18). It also serves as a receptor for several human pathogens: an enveloped RNA v...

Genetic and functional analyses of membrane cofactor protein (CD46) mutations in atypical hemolytic uremic syndrome.

Hemolytic uremic syndrome (HUS) is characterized by the triad of thrombocytopenia, microangiopathic hemolytic anemia, and acute renal failure. The non-Shiga toxin-associated HUS (atypical HUS [aHUS]) has been shown to be a disease of complement dysregulation. Mutations in the plasma complement regulators factor H and factor I and the widely expressed membrane cofactor protein (MCP; CD46) have b...