Recombinant Human Complement receptor type 1 (CR1), Truncated

Uniprot Id

P17927

Target Species

Human

Target Name

CR1

Target Full Name

Complement receptor type 1

Target Function

Membrane immune adherence receptor that plays a critical role in the capture and clearance of complement-opsonized pathogens by erythrocytes and monocytes/macrophages. Mediates the binding by these cells of particles and immune complexes that have activated complement to eliminate them from the circulation. Acts also in the inhibition of spontaneous complement activation by impairing the formation and function of the alternative and classical pathway C3/C5 convertases, and by serving as a cofactor for the cleavage by factor I of C3b to iC3b, C3c and C3d,g, and of C4b to C4c and C4d. Plays also a role in immune regulation by contributing, upon ligand binding, to the generation of regulatory T cells from activated helper T cells.; (Microbial infection) Acts as a receptor for Epstein-Barr virus.

Target Subcellular Location

Membrane; Single-pass type I membrane protein.

Target Protein Families

Receptors of complement activation (RCA) family

Target Tissue Specificity

Present on erythrocytes, a subset of T cells, mature B cells, follicular dendritic cells, monocytes and granulocytes.

Target Research Area

Others

Target Synonyms

C3 binding protein; C3b/C4b receptor; C3BR; C4BR; CD 35; CD35; CD35 antigen; complement component (3b/4b) receptor 1 (Knops blood group); complement component (3b/4b) receptor 1 including Knops blood group system; Complement component receptor 1; Complement receptor 1; Complement receptor type 1; CR 1; CR1; CR1_HUMAN; KN; Knops blood group antigen

Target Background

This gene is a member of the receptors of complement activation (RCA) family and is located in the 'cluster RCA' region of chromosome 1. The genome is polymorphic at this locus with allele-specific splice variants encoding different isoforms, based on the presence/absence of long homologous repeats (LHRs). The gene encodes a monomeric single-pass type I membrane glycoprotein found on erythrocytes, leukocytes, glomerular podocytes, and splenic follicular dendritic cells. The Knops blood group system is a system of antigens located on this protein. The protein mediates cellular binding to particles and immune complexes that have activated complement. Decreases in expression of this protein and/or mutations in this gene have been associated with gallbladder carcinomas, mesangiocapillary glomerulonephritis, systemic lupus erythematosus, sarcoidosis and Alzheimer's disease. Mutations in this gene have also been associated with a reduction in Plasmodium falciparum rosetting, conferring protection against severe malaria.