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Characterization of vitamin K-dependent carboxylase mutations that cause bleeding and nonbleeding disorders.

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Vitamin K-dependent coagulation factors deficiency is a bleeding disorder mainly associated with mutations in γ-glutamyl carboxylase (GGCX) that often has fatal outcomes. Some patients with nonbleeding syndromes linked to GGCX mutations, however, show no coagulation abnormalities. The correlation

Fatal hemorrhage in mice lacking gamma-glutamyl carboxylase.

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The carboxylation of glutamic acid residues to gamma-carboxyglutamic acid (Gla) by the vitamin K-dependent gamma-glutamyl carboxylase (gamma-carboxylase) is an essential posttranslational modification required for the biological activity of a number of proteins, including proteins involved in blood

Liver-specific γ-glutamyl carboxylase-deficient mice display bleeding diathesis and short life span.

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Vitamin K is a fat-soluble vitamin that plays important roles in blood coagulation and bone metabolism. One of its functions is as a co-factor for γ-glutamyl carboxylase (Ggcx). Conventional knockout of Ggcx causes death shortly after birth in homozygous mice. We created Ggcx-floxed mice by

Defective gamma-glutamyl carboxylase activity and bleeding in Rambouillet sheep.

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A flock of Rambouillet sheep was examined because of increased lamb mortality caused by ineffective hemostasis at parturition. Neonatal-affected lambs presented with inadequate hemostasis at the umbilicus, pale mucus membranes, and markedly prolonged activated clotting time. Affected lambs had

Bleeding predictors in patients following venous thromboembolism treated with vitamin K antagonists: Association with increased number of single nucleotide polymorphisms.

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Single nucleotide polymorphisms (SNP) in genes encoding proteins involved in metabolism and action of vitamin K antagonists (VKA) affect anticoagulation stability. We investigated how those polymorphisms influence bleeding rates in patients following venous thromboembolism (VTE). In 324 patients

Compound heterozygosity of novel missense mutations in the gamma-glutamyl-carboxylase gene causes hereditary combined vitamin K-dependent coagulation factor deficiency.

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Hereditary combined vitamin K-dependent (VKD) coagulation factor deficiency is an autosomal recessive bleeding disorder associated with defects in either the gamma-carboxylase, which carboxylates VKD proteins to render them active, or the vitamin K epoxide reductase (VKORC1), which supplies the

Novel splice site mutations in the gamma glutamyl carboxylase gene in a child with congenital combined deficiency of the vitamin K-dependent coagulation factors (VKCFD).

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Congenital combined deficiency of the vitamin K-dependent coagulation factors is a rare bleeding disorder caused by either a defect in the gamma-glutamyl carboxylase or the vitamin K epoxide reductase enzyme complex. The diagnosis should be considered when vitamin-K dependent factor activities are

Inhibition of vitamin K-dependent carboxylase in vitro by cefamandole and its structural analogs.

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Clinical use of the beta-lactam cephalosporins has resulted in a number of reports of vitamin K-responsive bleeding abnormalities. The effects of these antibiotics on the activities of vitamin K-dependent enzymes in vitro were therefore assessed. The activity of vitamin K-dependent carboxylase was

Pyruvate-carboxylase deficiency with urea cycle impairment.

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We report a case of pyruvate-carboxylase deficiency (EC 6.4.1.1, McKusick 26615) with neonatal onset of lactic acidosis, hyperammonemia, and citrullinemia. The patient developed signs of severe liver damage and died at 13 days of age after increasing metabolic acidosis and severe bleedings. The

Compound heterozygous mutations in the gamma-glutamyl carboxylase gene cause combined deficiency of all vitamin K-dependent blood coagulation factors.

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Hereditary combined deficiency of the vitamin K-dependent coagulation factors II, VII, IX, X, protein C, S and protein Z (VKCFD) is a very rare autosomal recessive inherited bleeding disorder. The phenotype may result from functional deficiency of either the gamma-glutamyl carboxylase (GGCX) or the

Deeper understanding of carboxylase.

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In this issue of Blood, Tie et al report the development of a cleverly engineered, cell-based system for studying mutations in γ-glutamyl carboxylase (GGCX), the enzyme responsible for converting glutamate residues in certain proteins to γ-carboxyglutamate (Gla). They use this cell-based assay

Characteristics of recombinant W501S mutated human gamma-glutamyl carboxylase.

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A mutation (W501S) in the vitamin K-dependent gamma-glutamyl carboxylase (VKC) that leads to a congenital bleeding disorder was recently discovered in two patients. To characterize the enzyme defect, recombinant VKC-W501S was expressed in and purified from insect cells. The major effect of the

The vitamin K-dependent carboxylase has been acquired by Leptospira pathogens and shows altered activity that suggests a role other than protein carboxylation.

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Leptospirosis is an emerging infectious disease whose pathology includes a hemorrhagic response, and sequencing of the Leptospira interrogans genome revealed an ortholog of the vitamin K-dependent (VKD) carboxylase as one of several hemostatic proteins present in the bacterium. Until now, the VKD

Expression and characterization of the naturally occurring mutation L394R in human gamma-glutamyl carboxylase.

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Patients with mutation L394R in gamma-glutamyl carboxylase have a severe bleeding disorder because of decreased biological activities of all vitamin K-dependent coagulation proteins. Vitamin K administration partially corrects this deficiency. To characterize L394R, we purified recombinant mutant

Enhanced functional recombinant factor VII production by HEK 293 cells stably transfected with VKORC1 where the gamma-carboxylase inhibitor calumenin is stably suppressed by shRNA transfection.

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BACKGROUND Recombinant members of the vitamin K-dependent protein family (factors IX and VII and protein C) have become important pharmaceuticals in treatment of bleeding disorders and sepsis. However, because the in vivo gamma-carboxylation system in stable cell lines used for transfection has a

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