T9698
Thioredoxin Reductase from rat liver
buffered aqueous glycerol solution, ≥100 units/mg protein (Bradford)
Synonyme(s) :
NADPH:Oxidised Thioredoxin Oxidoreductase, Thioredoxin: NADP+ Oxidoreductase
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About This Item
Numéro CAS:
Numéro MDL:
Code UNSPSC :
12352200
Nomenclature NACRES :
NA.32
Produits recommandés
Source biologique
rat liver
Niveau de qualité
Pureté
≥90% (GE)
Forme
buffered aqueous glycerol solution
Activité spécifique
≥100 units/mg protein (Bradford)
Poids mol.
55—67 kDa
Technique(s)
activity assay: suitable
Impuretés
Glutathione reductase
Solubilité
water: soluble
Adéquation
suitable for molecular biology
Numéro d'accès UniProt
Conditions d'expédition
dry ice
Température de stockage
−20°C
Informations sur le gène
rat ... Txnrd1(58819)
Description générale
Research area: Cell signaling
Application
Thioredoxin Reductase from rat liver can be used for studying the uptake and reduction of a-lipoic acid by utilizing reducing capacity of human erythrocytes. The product can also be used for studying the activation mechanism of transglutaminase 2 (TG2) in the extracellular matrix by using Thioredoxin.
Actions biochimiques/physiologiques
Thioredoxin Reductase is a ubiquitous enzyme that catalyzes the active site disulfide of thioredoxin by NADPH. The product also reduces ubiquinone and regenerates ubiquinol, a powerful antioxidant.
Thioredoxin reductase (TrxR) is a NADPH-dependent oxidoreductase containing one FAD per subunit that reduces the active site disulfide in oxidized thioredoxin (Trx). The molecular weight of the isozymes from mammalian sources vary between 55-67 kDa as compared with 35 kDa in prokaryotes, plants or yeast. The substrate specificity of the mammalian enzyme is much broader than the prokaryotic enzyme reducing both mammalian and E. coli thioredoxins as well as non-disulfide substrates such selenite, lipoic acids, lipid hydroperoxides, and hydrogen peroxide.
Thioredoxin reductase from mammalian sources contains a selenocysteine residue that is essential for the activity of the enzyme. It is one of the antioxidant enzymes present in the mammalian cell together with catalase, glutathione peroxidase and superoxide dismutase, and helps in removal of reactive oxygen species (ROS) from the cell. An example is the removal of excess nitric oxide (NO) by the formation of a complex with glutathione forming the S-nitroso-glutathione adduct (GS-NO). This can be cleaved directly by thioredoxin reductase. Hydrogen peroxide, another deleterious oxidant in the cell, is also reduced directly by mammalian TrxR.
Définition de l'unité
One unit will cause an increase in absorbance of 1.0 at 412 nm (when measured in a non-coupled assay containing DTNB [Sigma No. D8130] alone as substrate) per minute at pH 7.0 at 25 °C.
Forme physique
Solution in 50 mM Tris-HCl, pH 7.5, 300 mM NaCl, 1 mM EDTA, and 10% glycerol.
Code de la classe de stockage
12 - Non Combustible Liquids
Classe de danger pour l'eau (WGK)
WGK 1
Point d'éclair (°F)
Not applicable
Point d'éclair (°C)
Not applicable
Équipement de protection individuelle
Eyeshields, Gloves, multi-purpose combination respirator cartridge (US)
Certificats d'analyse (COA)
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Mammalian thioredoxin reductases (TrxR) are dimers homologous to glutathione reductase with a selenocysteine (SeCys) residue in the conserved C-terminal sequence -Gly-Cys-SeCys-Gly. We removed the selenocysteine insertion sequence in the rat gene, and we changed the SeCys(498) encoded by TGA to
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