Fibrinogen has a double function: yielding monomers that polymerize into fibrin and acting as a cofactor in platelet aggregation. Defects in FGB are a cause of congenital afibrinogenemia (CAFBN). This rare autosomal recessive disorder is characterized by bleeding that varies from mild to severe and by complete absence or extremely low levels of plasma and platelet fibrinogen. Patients with congenital fibrinogen abnormalities can manifest different clinical pictures. Some cases are clinically silent, some show a tendency toward bleeding and some show a predisposition for thrombosis with or without bleeding. Note: This description may include information from UniProtKB.
Protein type: Secreted, signal peptide; Secreted; Adaptor/scaffold; Cell surface
Chromosomal Location of Human Ortholog: 4q28
Cellular Component: extracellular space; cell surface; fibrinogen complex; extracellular region; plasma membrane; cell cortex; external side of plasma membrane
Molecular Function: protein binding, bridging; protein binding; chaperone binding; cell adhesion molecule binding; structural molecule activity; receptor binding
Biological Process: protein polymerization; platelet activation; extracellular matrix organization and biogenesis; positive regulation of heterotypic cell-cell adhesion; cell-matrix adhesion; signal transduction; platelet degranulation; cellular protein complex assembly; positive regulation of protein secretion; positive regulation of vasoconstriction; response to calcium ion; blood coagulation; positive regulation of exocytosis
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.