AAH12390.1
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UniProt Primary Accession #
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UniProt Secondary Accession #
UniProt Related Accession #
Molecular Weight
67,792 Da
NCBI Official Full Name
F12 protein
NCBI Official Synonym Full Names
coagulation factor XII (Hageman factor)
NCBI Protein Information
coagulation factor XII; Hageman factor; beta-factor XIIa part 1; beta-factor XIIa part 2; coagulation factor XIIa heavy chain; coagulation factor XIIa light chain
UniProt Protein Name
Coagulation factor XII
UniProt Synonym Protein Names
Hageman factor; HAF
UniProt Synonym Gene Names
UniProt Entry Name
FA12_HUMAN
NCBI Summary for F12
This gene encodes coagulation factor XII which circulates in blood as a zymogen. This single chain zymogen is converted to a two-chain serine protease with an heavy chain (alpha-factor XIIa) and a light chain. The heavy chain contains two fibronectin-type domains, two epidermal growth factor (EGF)-like domains, a kringle domain and a proline-rich domain, whereas the light chain contains only a catalytic domain. On activation, further cleavages takes place in the heavy chain, resulting in the production of beta-factor XIIa light chain and the alpha-factor XIIa light chain becomes beta-factor XIIa heavy chain. Prekallikrein is cleaved by factor XII to form kallikrein, which then cleaves factor XII first to alpha-factor XIIa and then to beta-factor XIIa. The active factor XIIa participates in the initiation of blood coagulation, fibrinolysis, and the generation of bradykinin and angiotensin. It activates coagulation factors VII and XI. Defects in this gene do not cause any clinical symptoms and the sole effect is that whole-blood clotting time is prolonged. [provided by RefSeq, Jul 2008]
UniProt Comments for F12
F12: Factor XII is a serum glycoprotein that participates in the initiation of blood coagulation, fibrinolysis, and the generation of bradykinin and angiotensin. Prekallikrein is cleaved by factor XII to form kallikrein, which then cleaves factor XII first to alpha-factor XIIa and then trypsin cleaves it to beta- factor XIIa. Alpha-factor XIIa activates factor XI to factor XIa. Defects in F12 are the cause of factor XII deficiency (FA12D); also known as Hageman factor deficiency. This trait is an asymptomatic anomaly of in vitro blood coagulation. Its diagnosis is based on finding a low plasma activity of the factor in coagulating assays. It is usually only accidentally discovered through pre-operative blood tests. F12 deficiency is divided into two categories, a cross-reacting material (CRM)-negative group (negative F12 antigen detection) and a CRM-positive group (positive F12 antigen detection). Defects in F12 are the cause of hereditary angioedema type 3 (HAE3); also known as estrogen-related HAE or hereditary angioneurotic edema with normal C1 inhibitor concentration and function. HAE is characterized by episodic local subcutaneous edema, and submucosal edema involving the upper respiratory and gastrointestinal tracts. HAE3 occurs exclusively in women and is precipitated or worsened by high estrogen levels (e.g. during pregnancy or treatment with oral contraceptives). It differs from HAE types 1 and 2 in that both concentration and function of C1 inhibitor are normal. Belongs to the peptidase S1 family.
Protein type: Secreted; EC 3.4.21.38; Chaperone; Secreted, signal peptide; Protease
Chromosomal Location of Human Ortholog: 5q35.3
Cellular Component: extracellular space; plasma membrane; extracellular region
Molecular Function: protein binding; serine-type endopeptidase activity; misfolded protein binding
Biological Process: response to misfolded protein; positive regulation of blood coagulation; proteolysis; protein autoprocessing; fibrinolysis; plasma kallikrein-kinin cascade; positive regulation of fibrinolysis; innate immune response; protein processing; zymogen activation; blood coagulation; blood coagulation, intrinsic pathway; Factor XII activation
Disease: Angioedema, Hereditary, Type Iii; Factor Xii Deficiency
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Pathways associated with F12 elisa kit
Diseases associated with F12 elisa kit
Organs/Tissues associated with F12 elisa kit
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