Complement Component 4b (C4B) ELISA Kit for Goat

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 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 its gene have been associated with gallbladder carcinomas, mesangiocapillary glomerulonephritis, systemic lupus erythematosus and sarcoidosis. Mutations in this gene have also been associated with a reduction in Plasmodium falciparum rosetting, conferring protection against severe malaria. Alternate allele-specific splice variants, encoding different isoforms, have been characterized. Additional allele specific isoforms, including a secreted form, have been described but have not been fully characterized. [provided by RefSeq, Jul 2008]

CR1: Mediates cellular binding of particles and immune complexes that have activated complement. Belongs to the receptors of complement activation (RCA) family.

Protein type: Receptor, misc.; Membrane protein, integral

Chromosomal Location of Human Ortholog: 1q32

Cellular Component: cell surface; integral to plasma membrane; plasma membrane

Molecular Function: complement component C3b receptor activity; complement component C4b binding; complement component C4b receptor activity; complement component C3b binding

Biological Process: negative regulation of complement activation, alternative pathway; complement receptor mediated signaling pathway; negative regulation of complement activation, classical pathway; regulation of complement activation; innate immune response; complement activation, classical pathway

Disease: Knops Blood Group System; Malaria, Susceptibility To