Aliases for F13B Gene
External Ids for F13B Gene
Previous GeneCards Identifiers for F13B Gene
This gene encodes coagulation factor XIII B subunit. Coagulation factor XIII is the last zymogen to become activated in the blood coagulation cascade. Plasma factor XIII is a heterotetramer composed of 2 A subunits and 2 B subunits. The A subunits have catalytic function, and the B subunits do not have enzymatic activity and may serve as a plasma carrier molecules. Platelet factor XIII is comprised only of 2 A subunits, which are identical to those of plasma origin. Upon activation by the cleavage of the activation peptide by thrombin and in the presence of calcium ion, the plasma factor XIII dissociates its B subunits and yields the same active enzyme, factor XIIIa, as platelet factor XIII. This enzyme acts as a transglutaminase to catalyze the formation of gamma-glutamyl-epsilon-lysine crosslinking between fibrin molecules, thus stabilizing the fibrin clot. Factor XIII deficiency is classified into two categories: type I deficiency, characterized by the lack of both the A and B subunits; and type II deficiency, characterized by the lack of the A subunit alone. These defects can result in a lifelong bleeding tendency, defective wound healing, and habitual abortion. [provided by RefSeq, Jul 2008]
GeneCards Summary for F13B Gene
F13B (Coagulation Factor XIII B Chain) is a Protein Coding gene. Diseases associated with F13B include Factor Xiiib Deficiency and Factor Xiii Deficiency. Among its related pathways are Collagen biosynthesis and modifying enzymes and Formation of Fibrin Clot (Clotting Cascade). An important paralog of this gene is CFH.
UniProtKB/Swiss-Prot for F13B Gene
The B chain of factor XIII is not catalytically active, but is thought to stabilize the A subunits and regulate the rate of transglutaminase formation by thrombin.