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In enzymology, a vitamin-K-epoxide reductase (warfarin-sensitive) (EC 1.17.4.4) is an enzyme that catalyzes the chemical reaction 2-methyl-3-phytyl-1,4-naphthoquinone + oxidized dithiothreitol ⇌ {\displaystyle \rightleftharpoons } 2,3-epoxy-2,3-dihydro-2-methyl-3-phytyl-1,4-naphthoquinone + 1,4-dithiothreitol
Human Chr 3. In terms of the cause of protein S deficiency it can be in inherited via autosomal dominance.A mutation in the PROS1 gene triggers the condition. The cytogenetic location of the gene in question is chromosome 3, specifically 3q11.1 [6] [7] Protein S deficiency can also be acquired due to vitamin K deficiency, treatment with warfarin, liver disease, kidney disease, chemotherapy ...
Warfarin is indicated for the prophylaxis and treatment of venous thrombosis and its extension, pulmonary embolism; [9] prophylaxis and treatment of thromboembolic complications associated with atrial fibrillation and/or cardiac valve replacement; [9] and reduction in the risk of death, recurrent myocardial infarction, and thromboembolic events such as stroke or systemic embolization after ...
The term "vitamin K antagonist" is a misnomer, as the drugs do not directly antagonise the action of vitamin K in the pharmacological sense, but rather the recycling of vitamin K. Vitamin K is required for the proper production of certain proteins involved in the blood clotting process.
Its partner is a redox protein with an unknown identity, [4] [5] probably a thioredoxin-like protein located in the ER lumen such as TMX1. [6] There is also a similar gene called VKORC1L1. The VKORL1 complex it forms is much less efficient at reducing the epoxide, but it has the ability to reduce the quinone form of vitamin K to a diol form (KH 2).
VKORC1 is a 163 amino acid integral membrane protein associated with the endoplasmic reticulum and VKORC1 mRNA is broadly expressed in many different tissues. VKORC1 is involved in the vitamin K cycle by reduction of vitamin K epoxide to vitamin K, which is the rate-limiting step in the physiological process of vitamin K recycling. [6]
Warfarin, a synthetic derivative of coumarin, is the most widely used oral anticoagulant in the US. In some European countries, other coumarin derivatives (phenprocoumon and acenocoumarol) are used. These agents known as vitamin K antagonists (VKA), inhibit the vitamin K-dependent carboxylation of Factors II (prothrombin), VII, IX, X in the ...
Prior to the introduction of direct factor Xa inhibitors, vitamin K antagonists such as warfarin were the only oral anticoagulants for over 60 years, and together with heparin have been the main blood thinners in use. People admitted to hospital requiring blood thinning were started on an infusion of heparin infusion, which thinned blood ...
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