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High-molecular weight kininogen

Kininogen 1
Symbol(s) KNG1; BDK; KNG
External IDs OMIM: 228960 MGI: 3027157 Homologene: 88343
RNA expression pattern

More reference expression data

Human Mouse
Entrez 3827 385643
Ensembl ENSG00000113889 ENSMUSG00000060459
Uniprot P01042 na
Refseq NM_000893 (mRNA)
NP_000884 (protein)
XM_989028 (mRNA)
XP_994122 (protein)
Location Chr 3: 187.92 - 187.94 Mb Chr 16: 22.9 - 22.94 Mb
Pubmed search [1] [2]

High-molecular weight kininogen (HMWK), also known as the Williams-Fitzgerald-Flaujeac factor or the Fitzgerald factor or the HMWK-kallikrein factor is a protein from the blood coagulation system as well as the kinin-kallikrein system. It is a protein that adsorbs to the surface of biomaterials that come in contact with blood in vivo. This protein circulates throughout the blood and quickly adsorbs to the material surfaces.



High-molecular weight kininogen is one of the kininogens, a class of proteins. As with many other coagulation proteins, the protein was initially named after the patients in whom deficiency was first observed. When the clinical data were combined, it turned out that all patients in fact had a deficiency of the same protein.


HMWK is one of the early participants of the intrinsic pathway of coagulation, together with Factor XII (Hageman factor) and prekallikrein. It is 626 amino acids long, and weighs 88 to 120 kDa (dependent on glycosylation). The kinigogen is not enzymatically active, and only functions as a cofactor for the activation of kallikrein and Hageman factor. It is also necessary for the activation of factor XI by factor XIIa. The histidine-rich region (amino acids 420 to 510) participates most strongly in coagulation.

In addition to its role in blood coagulation, HMWK (just as Low-molecular weight kininogen) is a strong inhibitor of cysteine proteinases. Responsible for this activity are three related domains on its heavy chain (Higashiyama et al., Biochemistry 25, 1669-75 (1986)).

HMWK is also a precursor of bradykinin; this vasodilator substance is released through positive feedback by kallikrein.


The gene for both types of kininogens is located on the 3rd chromosome (3q27).


Measurement of HMWK is usually done with mixing studies, where plasma deficient in HMWK is mixed with the patient's sample and the PTT determined. Results are expressed in % of normal - values under 60% or over 140% are abnormal.

Role in disease

The existence of HMWK was hypothesised in the 1970s when several patients were described with a deficiency of a class of plasma protein and a prolonged bleeding time and partial thromboplastin time (PTT). Like in deficiency of the associated Hageman factor, there is no increased risk of bleeding.

Further reading

  • Iarovaia GA (2001). "[Kallikrein-kinin system: novel facts and concepts (literature review)]". Vopr. Med. Khim. 47 (1): 20-42. PMID 11385996.
  • Matthews KW, Mueller-Ortiz SL, Wetsel RA (2004). "Carboxypeptidase N: a pleiotropic regulator of inflammation.". Mol. Immunol. 40 (11): 785-93. PMID 14687935.
  • Scharfstein J, Schmitz V, Svensjö E, et al. (2007). "Kininogens coordinate adaptive immunity through the proteolytic release of bradykinin, an endogenous danger signal driving dendritic cell maturation.". Scand. J. Immunol. 66 (2-3): 128-36. doi:10.1111/j.1365-3083.2007.01983.x. PMID 17635790.
  • Thompson RE, Mandle R, Kaplan AP (1980). "Studies of binding of prekallikrein and Factor XI to high molecular weight kininogen and its light chain.". Proc. Natl. Acad. Sci. U.S.A. 76 (10): 4862-6. PMID 291905.
  • Kerbiriou DM, Griffin JH (1980). "Human high molecular weight kininogen. Studies of structure-function relationships and of proteolysis of the molecule occurring during contact activation of plasma.". J. Biol. Chem. 254 (23): 12020-7. PMID 500690.
  • Colman RW, Bagdasarian A, Talamo RC, et al. (1976). "Williams trait. Human kininogen deficiency with diminished levels of plasminogen proactivator and prekallikrein associated with abnormalities of the Hageman factor-dependent pathways.". J. Clin. Invest. 56 (6): 1650-62. PMID 1202089.
  • Gailani D, Broze GJ (1991). "Factor XI activation in a revised model of blood coagulation.". Science 253 (5022): 909-12. PMID 1652157.
  • Cheung PP, Cannizzaro LA, Colman RW (1992). "Chromosomal mapping of human kininogen gene (KNG) to 3q26----qter.". Cytogenet. Cell Genet. 59 (1): 24-6. PMID 1733668.
  • Fong D, Smith DI, Hsieh WT (1991). "The human kininogen gene (KNG) mapped to chromosome 3q26-qter by analysis of somatic cell hybrids using the polymerase chain reaction.". Hum. Genet. 87 (2): 189-92. PMID 2066106.
  • Schmaier AH, Kuo A, Lundberg D, et al. (1988). "The expression of high molecular weight kininogen on human umbilical vein endothelial cells.". J. Biol. Chem. 263 (31): 16327-33. PMID 2460446.
  • Takagaki Y, Kitamura N, Nakanishi S (1985). "Cloning and sequence analysis of cDNAs for human high molecular weight and low molecular weight prekininogens. Primary structures of two human prekininogens.". J. Biol. Chem. 260 (14): 8601-9. PMID 2989293.
  • Kitamura N, Kitagawa H, Fukushima D, et al. (1985). "Structural organization of the human kininogen gene and a model for its evolution.". J. Biol. Chem. 260 (14): 8610-7. PMID 2989294.
  • Ishiguro H, Higashiyama S, Namikawa C, et al. (1987). "Interaction of human calpains I and II with high molecular weight and low molecular weight kininogens and their heavy chain: mechanism of interaction and the role of divalent cations.". Biochemistry 26 (10): 2863-70. PMID 3038169.
  • Vogel R, Assfalg-Machleidt I, Esterl A, et al. (1988). "Proteinase-sensitive regions in the heavy chain of low molecular weight kininogen map to the inter-domain junctions.". J. Biol. Chem. 263 (25): 12661-8. PMID 3045123.
  • Maeda H, Matsumura Y, Kato H (1988). "Purification and identification of [hydroxyprolyl3]bradykinin in ascitic fluid from a patient with gastric cancer.". J. Biol. Chem. 263 (31): 16051-4. PMID 3182782.
  • Kato H, Matsumura Y, Maeda H (1988). "Isolation and identification of hydroxyproline analogues of bradykinin in human urine.". FEBS Lett. 232 (1): 252-4. PMID 3366244.
  • Kellermann J, Lottspeich F, Henschen A, Müller-Esterl W (1986). "Completion of the primary structure of human high-molecular-mass kininogen. The amino acid sequence of the entire heavy chain and evidence for its evolution by gene triplication.". Eur. J. Biochem. 154 (2): 471-8. PMID 3484703.
  • Kellermann J, Thelen C, Lottspeich F, et al. (1988). "Arrangement of the disulphide bridges in human low-Mr kininogen.". Biochem. J. 247 (1): 15-21. PMID 3689342.
  • Warn-Cramer BJ, Bajaj SP (1986). "Stoichiometry of binding of high molecular weight kininogen to factor XI/XIa.". Biochem. Biophys. Res. Commun. 133 (2): 417-22. PMID 3936495.
  • Lottspeich F, Kellermann J, Henschen A, et al. (1985). "The amino acid sequence of the light chain of human high-molecular-mass kininogen.". Eur. J. Biochem. 152 (2): 307-14. PMID 4054110.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "High-molecular_weight_kininogen". A list of authors is available in Wikipedia.
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