Coagulation factor XIII A chain, (FXIIIa) is a protein that in humans is encoded by the F13A1 gene.

Quick Facts F13A1, Available structures ...
F13A1
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesF13A1, F13A, coagulation factor XIII A chain
External IDsOMIM: 134570; MGI: 1921395; HomoloGene: 20077; GeneCards: F13A1; OMA:F13A1 - orthologs
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_000129

NM_001166391
NM_028784

RefSeq (protein)

NP_000120

NP_001159863
NP_083060

Location (UCSC)Chr 6: 6.14 – 6.32 MbChr 13: 37.05 – 37.23 Mb
PubMed search[3][4]
Wikidata
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Function

This gene encodes the coagulation factor XIII A 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 plasma carrier molecules. Platelet factor XIII is composed of just 2 A subunits, which are identical to those of plasma origin. Upon 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. It also crosslinks alpha-2-plasmin inhibitor, or fibronectin, to the alpha chains of fibrin. 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.[5]

Interactions

Coagulation factor XIII A chain has been shown to interact with coagulation factor XIII B chain.[6][7]

References

Further reading

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