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K1632 Sigma-Aldrich

Kininogen high molecular weight, Two Chain from human plasma

lyophilized powder



General description

High-molecular-weight kininogen (HK) is the substrate and cofactor of the plasma kallikrein-kinin system (KKS). It is present at a concentration of 660 nM on the plasma and binds to platelet GPI-V-IX complex. It inhibits binding of thrombin to platelets.

Biochem/physiol Actions

High molecular weight kininogen, two chain, is a participant in contact phase activation of the intrinsic blood coagulation cascade that forms a substrate on which blood factor XI is held in proximity to factor XII allowing reciprocal activation of the two factors. It is also involved in the activation of prekallikrein. High molecular weight kininogen binds to proteoglycans on the surface of platelets, endothelial cells, and other cell types. Domain 5 of high molecular weight kininogen inhibits platelet aggregation and angiogenesis.


Package size based on protein content

Physical form

Lyophilized from 4 mM sodium acetate, pH 5.3, 0.15 M NaCl

Preparation Note

Prepared by kallikrein digestion of human kininogen. Purified to remove kallikrein and kinin.

Safety & Documentation

Safety Information

NONH for all modes of transport


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


Plasma Derived Proteins and Enzymes

Despite their complexity, blood and plasma are abundant biological resources for the discovery of drug targets and biomarkers for human disease. It is estimated that plasma may contain as many as 40,...
BioFiles 2006, 1.5, 2.
Keywords: Applications, Gas chromatography, Type

Peer-Reviewed Papers


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