H7016
Hirudin from leeches
lyophilized powder, ≥1,500 ATU/mg protein (ATU = antithrombin units)
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![[Tyr(SO3H)63]-Hirudin Fragment 54-65 ≥95% (HPLC)](/deepweb/assets/sigmaaldrich/product/structures/401/056/a0ac1972-7f9e-45b9-8e32-74f3f275e097/640/a0ac1972-7f9e-45b9-8e32-74f3f275e097.png)
biological source
animal (Hirudo medicinalis)
Quality Level
100
200
form
lyophilized powder
specific activity
≥1,500 ATU/mg protein (ATU = antithrombin units)
mol wt
7 kDa
solubility
pyridine: soluble
water: soluble
storage temp.
2-8°C
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General description
Hirudin is a 7 kDa acidic protein containing 65 amino acid residues that has an isoelectric point of 3.5-4.0. It is not glycosylated and lacks tryptophan, arginine and methionine residues. It is chemically stable between pH 2-12 and at temperatures up to 80°C.
Biochem/physiol Actions
The anticoagulant, hirudin, is the most potent natural inhibitor of both soluble and clot-bound thrombin. It forms a high-affinity 1:1 complex with thrombin, occluding both the proteolytic site and exosite I (fibrinogen and PAR recognition site). Hirudin blocks thrombus growth and platelet activation, and has been suggested as the clinically preferred anticoagulant (over heparin and citrate) for its specific mode of action and absence of side effects. It is not metabolized in the bloodstream of humans and is eliminated unchanged via kidney filtration.
Unit Definition
One unit (ATU) will neutralize one NIH unit of thrombin at 37 °C, based on direct comparison to an NIH thrombin reference standard.
Analysis Note
Protein determined by Lowry.
Storage Class Code
11 - Combustible Solids
WGK
WGK 3
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
Certificates of Analysis (COA)
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Sarah E Sartain et al.
Journal of immunology (Baltimore, Md. : 1950), 196(2), 832-845 (2015-12-18)
Atypical hemolytic uremic syndrome (aHUS) is a thrombotic microangiopathy with severe renal injury secondary to an overactive alternative complement pathway (AP). aHUS episodes are often initiated or recur during inflammation. We investigated gene expression of the surface complement regulatory proteins
Mengzhou Xue et al.
Brain : a journal of neurology, 132(Pt 1), 26-36 (2008-09-06)
Proteases such as matrix metalloproteinases (MMPs) and thrombin are implicated in intracerebral haemorrhage (ICH) but their interactions amongst one another and interdependency remain to be defined. The latter is important since proteases acting through different mechanisms to inflict neurotoxicity would
Yaoming Wang et al.
Stroke, 40(5), 1864-1869 (2008-12-06)
Activated protein C (APC), a protease with anticoagulant and cytoprotective activities, protects neurons and endothelium from ischemic injury. Drotrecogin-alfa activated, a hyperanticoagulant form of human recombinant APC, is currently being studied in patients with ischemic stroke. How changes in APC
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