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evolution
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clear difference in VKOR activity and Ki for warfarin among bird species
evolution
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clear difference in VKOR activity and Ki for warfarin among bird species
evolution
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clear difference in VKOR activity and Ki for warfarin among bird species
evolution
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clear difference in VKOR activity and Ki for warfarin among bird species
evolution
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clear difference in VKOR activity and Ki for warfarin among bird species
evolution
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the enzyme belongs to the thiol-disulfide oxidoreductases. VKORL1, EC 1.1.4.2, is more highly conserved among vertebrates than its evolutionary relative VKOR, EC 1.1.4.1. The human paralogous proteins are 42% identical with 60% similarity
malfunction
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depletion of the protein disulfide formation activity of the enzyme in the endoplasmic reticulum results in cell death. Knockdown of the enzyme results in no detectable increase in expression of the ER Hsp70 chaperone BiP nor evidence of Xbp-1 splicing when measured on the final day of knockdown, indicating that an unfolded protein response is not being induced
malfunction
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warfarin interfers with the vitamin K cycle by inhibiting VKOR thus limiting the available activated hydroquinone cofactor and functionally impeding various blood clotting proteins that are dependent on gamma-carboxyglutamate residues
malfunction
some naturally occuring mutations of the enzyme, e.g. at residues mutations at Leu120, Leu128 and Tyr139, confer resistance against anti-coagulants, sodium warfarin, difenacoum and brodifacoum, to rats
metabolism
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vitamin K carboxylase converts vitamin K, in the vitamin K cycle, to an alkoxide-epoxide form which then reacts with CO2 and glutamate to generate gamma-carboxyglutamic acid. Subsequently, vitamin K epoxide reductase converts the alkoxide-epoxide to a hydroquinone form. By recycling vitamin K, the two integral-membrane proteins maintain vitamin K levels and sustain the blood coagulation cascade. Heterodimeric form of vitamin K carboxylase and vitamin K epoxide reductase may explain the efficient oxidation and reduction of vitamin K during the vitamin K cycle
metabolism
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vitamin K cycle, overview
metabolism
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VKOR contributes to an oxidizing endoplasmic reticulum environment under conditions of endoplasmic reticulum oxidoreductin and peroxiredoxin IV deficiency
metabolism
a key enzyme in the vitamin K cycle
metabolism
a key enzyme in the vitamin K cycle
metabolism
in vivo VKORC1L1 reduces vitamin K epoxide to support vitamin K-dependent carboxylation as efficiently as does VKORC1
metabolism
one of the key enzymes in the vitamin K cycle, which is essential for posttranslational modification of vitamin K-dependent proteins. Essential enzyme for vitamin K-dependent carboxylation
metabolism
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posttranslocational protein folding in the Gram-positive biofilm-forming actinobacterium Actinomyces oris is mediated by a membrane-bound thiol-disulfide oxidoreductase named MdbA, which catalyzes oxidative folding of nascent polypeptides transported by the Sec translocon. Reoxidation of MdbA involves a bacterial vitamin K epoxide reductase (VKOR)-like protein
metabolism
the enzyme plays important roles in redox regulation. The enzyme is involved in resistance to salt or drought stress. Down- and up-regulation of the enzyme in vivo changes the activities of antioxidant enzymes and results in differential accumulation of reactive oxygen species
metabolism
vitamin K 2,3-epoxide reductase family enzymes are the gatekeepers between nutritionally acquired K vitamins and the vitamin K cycle responsible for posttranslational modifications that confer biological activity upon vitamin K-dependent proteins with crucial roles in hemostasis, bone development and homeostasis, hormonal carbohydrate regulation and fertility
metabolism
VKORC1 is the key enzyme of the classical vitamin K cycle by which vitamin K-dependent proteins are gamma-carboxylated by the hepatic gamma-glutamyl carboxylase
metabolism
VKORC1L1 is chiefly responsible for antioxidative function by reduction of vitamin K to prevent damage by intracellular reactive oxygen species
physiological function
function of VKORC1 is to regenerate vitamin K and vitamin K hydroquinone from vitamin K 2,3-epoxide, a byproduct of the vitamin K-dependent gamma carboxylation reaction
physiological function
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human herpesvirus 8 viral interleukin-6 interacts with splice variant 2 of vitamin K epoxide reductase complex subunit 1, VKORC1v2, via the C-terminal residues 31-39 of the enzyme in the endoplasmic reticulum lumen, interaction analysis, VKORC1v2 to intracellular retention of endogenously expressed vIL-6, detailed overview
physiological function
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the enzyme is involved in the vitamin K cycle maintaining vitamin K levels and sustain the blood coagulation cascade
physiological function
the enzyme is regulated by microRNA miR-133a, which may have potential importance for anticoagulant therapy or aortic calcification. miR-133a levels correlate inversely with VKORC1 mRNA levels in 23 liver samples from healthy subjects
physiological function
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vitamin K 2,3-epoxide reductase complex subunit 1 is an essential enzyme for proper function of blood coagulation
physiological function
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vitamin K dependent oxidative protection is independent of VKOR inhibition by warfarin and GGCX inhibition by 2-chloro-vitamin K1, which indicated that vitamin K plays potential physiological roles outside of the realm of carboxylation. The hVKORL1, EC 11.4.2, turnover rate for vitamin K 2,3-epoxide reductase activity is significantly slower than for hVKOR
physiological function
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vitamin K epoxide reductase contributes to protein disulfide formation and redox homeostasis within the endoplasmic reticulum,depletion of the activity results in cell death, both peroxiredoxin IV and VKOR support cell growth and viability in the face of endoplasmic reticulum oxidoreductin depletion
physiological function
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vitamin K epoxide reductase is essential for the production of reduced vitamin K that is required for modification of vitamin K-dependent proteins
physiological function
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the vitamin K oxidoreductase reduces vitamin K to support the carboxylation and consequent activation of vitamin K-dependent proteins
physiological function
VKORC1 is an essential element involved in the correct gamma-carboxylation of vitamin K-dependent proteins such as Gas6, matrix-GLA protein and osteocalcin, as well as hemostatic proteins C, S and Z and coagulation factors II, VII, IX and X. vitamin K 2,3-epoxide reductase complex subunit 1, VKORC1, is a key protein in the vitamin K cycle, it is regulated by microRNA miR-133a, overview. Vitamin K 2,3-epoxide reductase complex subunit 1 is a relevant molecule for cardiovascular diseases, since it plays a role in soft tissue calcification
additional information
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conserved loop cysteines in VKOR are not required for active site regeneration after each cycle of oxidation
additional information
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membrane topology models for human VKOR, overview
additional information
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possible heterodimeric form of vitamin K carboxylase and vitamin K epoxide reductase during the vitamin K cycle and co-localization on the lumenal side of endoplasmic reticulum membrane, molecular dynamics simulations and modeling, overview
additional information
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structure-function relationship, the CXXC redox center active site (hVKOR Cys132 and Cys135) is located in the final transmembrane helix near the endoplasmic reticulum lumen/periplasmic side of the membrane, overview
additional information
VKORC1 function is measured in vitro using a dithiothreitol-driven vitamin K 2,3-epoxide reductase assay. Warfarin inhibits wild-type VKORC1 function by the DTT-VKOR assay. However, VKORC1 variants with warfarin resistance-associated missense mutations often show low VKOR activities and warfarin sensitivity instead of resistance. Development and evaluation of a cell culture-based, indirect VKOR assay accurately reports warfarin sensitivity or resistance for wild-type and variant VKORC1 proteins
additional information
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VKORC1 function is measured in vitro using a dithiothreitol-driven vitamin K 2,3-epoxide reductase assay. Warfarin inhibits wild-type VKORC1 function by the DTT-VKOR assay. However, VKORC1 variants with warfarin resistance-associated missense mutations often show low VKOR activities and warfarin sensitivity instead of resistance. Development and evaluation of a cell culture-based, indirect VKOR assay accurately reports warfarin sensitivity or resistance for wild-type and variant VKORC1 proteins
additional information
VKORC1 function is measured in vitro using a dithiothreitol-driven vitamin K 2,3-epoxide reductase assay. Warfarin inhibits wild-type VKORC1 function by the DTTVKOR assay. However, VKORC1 variants with warfarin resistance-associated missense mutations often show low VKOR activities and warfarin sensitivity instead of resistance. Development and evaluation of a cell culture-based, indirect VKOR assay accurately reports warfarin sensitivity or resistance for wild-type and variant VKORC1 proteins
additional information
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VKORC1 function is measured in vitro using a dithiothreitol-driven vitamin K 2,3-epoxide reductase assay. Warfarin inhibits wild-type VKORC1 function by the DTTVKOR assay. However, VKORC1 variants with warfarin resistance-associated missense mutations often show low VKOR activities and warfarin sensitivity instead of resistance. Development and evaluation of a cell culture-based, indirect VKOR assay accurately reports warfarin sensitivity or resistance for wild-type and variant VKORC1 proteins
additional information
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compounds target blood coagulation by inhibiting the vitamin K epoxide reductase (VKORC1), which catalyzes the reduction of vitamin K 2,3-epoxide to vitamin K
additional information
compounds target blood coagulation by inhibiting the vitamin K epoxide reductase (VKORC1), which catalyzes the reduction of vitamin K 2,3-epoxide to vitamin K
additional information
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role for Cys43 and Cys51 in catalysis with a relay mechanism in which a redox protein transfers electrons to these loop residues, which in turn reduce the membrane-embedded Cys132-Cys135 disulfide bond to activate VKOR
additional information
identification of the functional states of human Vitamin K epoxide reductase from molecular dynamics simulations
additional information
phylogenetic characterization of VKOR family proteins. A chronology for the evolution of the five extant VKOR clades is suggested
additional information
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phylogenetic characterization of VKOR family proteins. A chronology for the evolution of the five extant VKOR clades is suggested
additional information
the conserved loop cysteines of VKORC1L1, but not VKORC1, are involved in active site regeneration through an intra-molecular pathway. The different structures and reaction mechanisms of VKORC1L1 and VKORC1 may imply that these two enzymes have different physiological functions