title: Multiple carboxylase deficiency.
abstract: 1. The multiple carboxylase deficiencies are inborn errors in the metabolism of biotin in which there is defective activity of propionyl CoA carboxylase, 3-methylcrotonyl CoA carboxylase and pyruvate carboxylase. 2. Two distinct disorders have been described. 3. In one the fundamental defect is in the enzyme holocarboxylase synthetase which catalyzes the molecular activation of the apocarboxylase proteins. 4. In the other the fundamental defect is in biotinidase which catalyzes the reutilization of biotin and may be involved in its digestion and intestinal absorption.
authors.affiliation: University of California San Diego, La Jolla 92093.
authors.forename: W L
authors.initials: WL
authors.lastname: Nyhan
mesh_terms: D000581:Amidohydrolases / Q000172:deficiency; D001710:Biotin / Q000172:deficiency / Q000378:metabolism*; D043523:Biotinidase; D019731:Carbon-Nitrogen Ligases; D006801:Humans; D008025:Ligases / Q000172:deficiency; D008661:Metabolism, Inborn Errors / Q000201:enzymology*; D009100:Multiple Carboxylase Deficiency / Q000201:enzymology / Q000235:genetics / Q000503:physiopathology
chemical_list: D001710:Biotin; D000581:Amidohydrolases; D043523:Biotinidase; D008025:Ligases; D019731:Carbon-Nitrogen Ligases; C023312:holocarboxylase synthetases