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Research Article Free access | 10.1172/JCI112415

Deficiency of 3-methylglutaconyl-coenzyme A hydratase in two siblings with 3-methylglutaconic aciduria.

K Narisawa, K M Gibson, L Sweetman, W L Nyhan, M Duran, and S K Wadman

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Published April 1, 1986 - More info

Published in Volume 77, Issue 4 on April 1, 1986
J Clin Invest. 1986;77(4):1148–1152. https://doi.org/10.1172/JCI112415.
© 1986 The American Society for Clinical Investigation
Published April 1, 1986 - Version history
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Abstract

We studied two patients with 3-methylglutaconic aciduria in order to determine the molecular defect. A new assay for 3-methylglutaconyl-coenzyme A (CoA) hydratase has been developed in which the substrate, [5-14C]3-methylglutaconyl-CoA, was synthesized using 3-methylcrotonyl-CoA carboxylase purified from bovine kidney. In this assay the products of the reaction are isolated by reverse-phase high performance liquid chromatography and the rates of conversion from substrate are measured. The Michaelis constant for 3-methylglutaconyl-CoA in normal fibroblasts was 6.9 mumol/liter. The mean activity of 3-methylglutaconyl-CoA hydratase in control fibroblasts was 495 pmol/min per mg protein. In the two patients the values were 11 and 17 pmol/min per mg protein, or 2-3% of normal.

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