H7016
Hirudin
from leeches, ≥1,500 ATU/mg protein, lyophilized powder
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Product Name
Hirudin from leeches, lyophilized powder, ≥1,500 ATU/mg protein (ATU = antithrombin units)
biological source
animal (Hirudo verbana)
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 binds thrombin with high affinity, covering more than 20% of its surface area and occluding both the active site and exosite I (fibrinogen and PAR recognition site). Hirudin blocks thrombus growth and platelet activation. It is not metabolized in the bloodstream of humans and is eliminated unchanged via kidney filtration.
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
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