Search
complement C1q-beta chain (complement C1q subunit B, C1QB)
Function:
- component of complement C1q & thus the complement cascade
- binding site for immunoglobulin binds IgM & IgG subclasses IgG1, IgG2, & IgG3
Structure:
- contains 1 C1q domain
- contains 1 collagen-like domain
- O-linked glycans consist of Glc-Gal disaccharides bound to the oxygen atom of post-translationally added hydroxyl groups
Compartment: secreted
Pathology: defects in C1QB are a cause of C1q deficiency
General
protein subunit
Properties
SIZE: entity length = 251 aa
MW = 26 kD
MOTIF: signal sequence {1-25}
Collagen-like
NAME: Collagen-like
SITE: 29-112
MOTIF: glycine residue
proline residue
hydroxyproline residue
cysteine residue {C29}
MODIFICATION: cysteine residue {C26 IN CHAIN A}
C1q {115-251}
MOTIF: binding site
FOR-BINDING-OF: IgG
Database Correlations
OMIM 120570
UniProt P02746
PFAM correlations
Kegg hsa:713
References
- OMIM :accession 120570
- Clinical Diagnosis & Management by Laboratory Methods,
J.B. Henry (ed), W.B. Saunders Co., Philadelphia,
PA. 1991, pg 831
Component-of
complement C1q