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Fibrin (also called Factor Ia) is a fibrous, non-globular protein involved in the clotting of blood. It is formed by the action of the protease thrombin on fibrinogen , which causes it to polymerize .
Fibrinogen is made and secreted into the blood primarily by liver hepatocyte cells. Endothelium cells are also reported to make small amounts of fibrinogen, but this fibrinogen has not been fully characterized; blood platelets and their precursors, bone marrow megakaryocytes, while once thought to make fibrinogen, are now known to take up and store but not make the glycoprotein.
A subunits of human factor XIII are made primarily by platelets and other cells of bone marrow origin. B subunits are secreted into blood by hepatocytes. A and B units combine within blood to form heterotetramers of two A units and two B units. Blood plasma concentration of the heterotetramers is 14–48 mg/L and half-life is 9–14 days. [1]
The coagulation factors are generally enzymes called serine proteases, which act by cleaving downstream proteins. The exceptions are tissue factor, FV, FVIII, FXIII. [28] Tissue factor, FV and FVIII are glycoproteins, and Factor XIII is a transglutaminase. [27] The coagulation factors circulate as inactive zymogens. The coagulation cascade is ...
In the conversion of fibrinogen into fibrin, thrombin catalyzes the cleavage of fibrinopeptides A and B from the respective Aα and Bβ chains of fibrinogen to form fibrin monomers. [13] Factor XIIIa is a transglutaminase that catalyzes the formation of covalent bonds between lysine and glutamine residues in fibrin. The covalent bonds increase ...
A thrombus (pl. thrombi), colloquially called a blood clot, is the final product of the blood coagulation step in hemostasis. There are two components to a thrombus: aggregated platelets and red blood cells that form a plug, and a mesh of cross-linked fibrin protein. The substance making up a thrombus is sometimes called cruor.
Blood plasma is a light amber-colored liquid component of blood in which blood cells are absent, but which contains proteins and other constituents of whole blood in suspension. It makes up about 55% of the body's total blood volume. [1] It is the intravascular part of extracellular fluid (all body fluid outside cells).
2161 58992 Ensembl ENSG00000131187 ENSMUSG00000021492 UniProt P00748 Q80YC5 RefSeq (mRNA) NM_000505 NM_021489 RefSeq (protein) NP_000496 NP_067464 Location (UCSC) Chr 5: 177.4 – 177.42 Mb Chr 13: 55.57 – 55.57 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Coagulation factor XII, also known as Hageman factor, is a plasma protein involved in coagulation. It is the zymogen form of ...