Biomaterial Database

Vitamin K-dependent carboxylase. Development of a peptide substrate. 1976

J W Suttie, and J M Hageman

Rat liver microsomes contain a vitamin K-dependent carboxylase activity that converts specific glutamyl residues of microsomal prothrombin precursor to gamma-carboxyglutamic acid residues. This activity has now been solubilized by treatment with Triton X-100. The pentapeptide, Phe-Leu-Glu-Glu-Val, has been synthesized; and it has been demonstrated that, in the presence of this peptide, the solubilized microsomes catalyze a vitamin K-dependent incorporation of added H14CO3- into a low molecular weight trichloroacetic acid-soluble compound. The carboxylated product has been identified as peptide-bound gamma-carboxyglutamic acid by its chemical stability during acidic and alkaline hydrolysis and by co-chromatography of an alkaline hydrolysate of the product with authentic gamma-carboxyglutamic acid. The conditions for peptide carboxylation appear to be identical with those demonstrated for precursor carboxylation.

UI	MeSH Term	Description	Entries
D007700	Kinetics	The rate dynamics in chemical or physical systems.
D008297	Male		Males
D008862	Microsomes, Liver	Closed vesicles of fragmented endoplasmic reticulum created when liver cells or tissue are disrupted by homogenization. They may be smooth or rough.	Liver Microsomes,Liver Microsome,Microsome, Liver
D009842	Oligopeptides	Peptides composed of between two and twelve amino acids.	Oligopeptide
D002262	Carboxy-Lyases	Enzymes that catalyze the addition of a carboxyl group to a compound (carboxylases) or the removal of a carboxyl group from a compound (decarboxylases). EC 4.1.1.	Carboxy-Lyase,Decarboxylase,Decarboxylases,Carboxy Lyase,Carboxy Lyases
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D014812	Vitamin K	A lipid cofactor that is required for normal blood clotting. Several forms of vitamin K have been identified: VITAMIN K 1 (phytomenadione) derived from plants, VITAMIN K 2 (menaquinone) from bacteria, and synthetic naphthoquinone provitamins, VITAMIN K 3 (menadione). Vitamin K 3 provitamins, after being alkylated in vivo, exhibit the antifibrinolytic activity of vitamin K. Green leafy vegetables, liver, cheese, butter, and egg yolk are good sources of vitamin K.
D014813	Vitamin K Deficiency	A nutritional condition produced by a deficiency of VITAMIN K in the diet, characterized by an increased tendency to hemorrhage (HEMORRHAGIC DISORDERS). Such bleeding episodes may be particularly severe in newborn infants. (From Cecil Textbook of Medicine, 19th ed, p1182)	Deficiency, Vitamin K,Deficiencies, Vitamin K,Vitamin K Deficiencies
D051381	Rats	The common name for the genus Rattus.	Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus