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Clinical Chemistry, Vol 29, 1955-1958, Copyright © 1983 by American Association for Clinical Chemistry
YS Shin, V Moro, H Doliwa and W Endres
A sensitive new method in which D-[U-14C]fructose-1-phosphate is used for fructose-bisphosphate aldolase (EC 2.1.2.13) assay is described. The radioactive fructose-1-phosphate compound was prepared from [U- 14C]fructose by use of partly purified fructokinase (EC 2.7.1.4). With this method we measured normal values for aldolase in human liver (2.4- 10.0 nmol/min per mg of protein), kidney (3.6-3.8), and intestine (4.2- 10.0) as well as Km values for fructose-1-phosphate (approximately 1.0- 2.2 mmol/L). In patients with hereditary fructose intolerance the aldolase activity in liver and intestine was less than 10% of normal values. The Lineweaver-Burk plots for data from patients with hereditary fructose intolerance were hyperbolic, indicating a structural alteration in the enzyme.
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