Preparative synthesis of saccharopine.
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Biomedical subjects
Publications and source records attributed to J Hutzler.
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Fibroblasts grown in tissue culture from the skin of normal subjects have lysine-ketoglutarate reductase activity (lysine: alpha-ketoglutarate: triphosphopyridine nucleotide (TPNH) oxidoreductase (epsilon-N-[L-glutaryl-2]-L-lysine forming)). The activity of the enzyme is considerably reduced in the skin fibroblasts grown from three siblings with hyperlysinemia. The high concentrations of lysine in the blood of these patients, the previous demonstration in the intact subject of a reduction in the ability to degrade lysine, and the present demonstration of diminished lysine-ketoglutarate reductase activity, accurately define the metabolic defect and establish the saccharopine (epsilon-N-[L-glutaryl-2]-L-lysine) pathway as the major degradative pathway for lysine in the human.
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An infant with neonatal adrenoleukodystrophy experienced extreme hypotonia and virtually continuous convulsions at four months of age and died. Light and electron microscopic examination revealed evidence of myopathy and the presence of mitochondrial inclusions. Concentrations of very long-chain fatty acids were elevated in blood and fibroblasts and the oxidation of 14C-labeled fatty acids was defective. Urinary pipecolic acid content was increased. Activity of the peroxisomal dihydroxyacetone phosphate acyltransferase, which catalyzes the first step in plasmalogen synthesis, was decreased.