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C1qB  Protein, Antibody, ELISA Kit, cDNA Clone

Expression host: Baculovirus-Insect Cells  
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C1qB Related Area

C1qB Related Pathways

    C1qB Related Protein, Antibody, cDNA Gene, and ELISA Kits

    C1qB Related Protein, Antibody, cDNA Gene, and ELISA Kits

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    C1qB Summary & Protein Information

    C1qB Background

    Subunit structure: C1 is a calcium-dependent trimolecular complex of C1q, c1r and C1s in the molar ration of 1:2:2. C1q subcomponent is composed of nine subunits, six of which are disulfide-linked dimers of the A and B chains, and three of which are disulfide-linked dimers of the C chain. {ECO:0000269|PubMed:708376}.
    Subcellular location: Secreted.
    Post-translational: Hydroxylated on lysine and proline residues. Hydroxylated lysine residues can be glycosylated. Human C1Q contains up to 68.3 hydroxylysine-galactosylglucose residues and up to 2.5 hydroxylysine-galactose per molecule. Total percentage hydroxylysine residues glycosylated is 86.4%. {ECO:0000269|PubMed:486087, ECO:0000269|PubMed:6286235, ECO:0000269|PubMed:708376}.
    Involvement in disease: DISEASE: Complement component C1q deficiency (C1QD) [MIM:613652]: A disorder caused by impaired activation of the complement classical pathway. It generally leads to severe immune complex disease with features of systemic lupus erythematosus and glomerulonephritis. {ECO:0000269|PubMed:9476130}. Note=The disease is caused by mutations affecting the gene represented in this entry.
    Sequence similarity: Contains 1 C1q domain. {ECO:0000255|PROSITE-ProRule:PRU00368}.; Contains 2 collagen-like domains. {ECO:0000305}.
    General information above from UniProt

    Complement Component 1, q subcomponent (C1q) associates with C1r and C1s in order to yield the first component of the serum complement system. Deficiency of C1q has been associated with lupus erythematosus and glomerulonephritis. C1q is composed of 18 polypeptide chains: six A-chains, six B-chains, and six C-chains. Southern blot analysis of chromosomal DNA from vertebrate species demonstrated highest similarity between the C1qB genes, followed by C1qC and finally C1qA. Sequence comparison of C1q from three different species have shown that the B chains have the strongest similarity. C1q was already present at embryonic day 14 (E14) and showed little change in abundance through six weeks postnatal. At E16, C1qB mRNA was present at high abundance in putative microglia/macrophages in cortical marginal and intermediate zones, and hippocampal analge.

    C1qB Alternative Name

    C1QB, [human]

    C1qB Related Studies

  • Pasinetti GM, et al. (1992) Complement C1qB and C4 mRNAs responses to lesioning in rat brain. Experimental neurology. 118(2): 117-25.
  • Johnson SA, et al. (1994) Expression of complement C1qB and C4 mRNAs during rat brain development. Brain Res Dev Brain Res. 80(1-2): 163-74.
  • Grewal RP,et al. (1999) C1qB and clusterin mRNA increase in association with neurodegeneration in sporadic amyotrophic lateral sclerosis. Neuroscience letters. 271(1): 65-7.
  • Spielman L, et al. (2002) Induction of the complement component C1qB in brain of transgenic mice with neuronal overexpression of human cyclooxygenase-2. Acta neuropathologica. 103(2): 157-62.