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From the Klinik und Poliklinik für Neurologie (Drs. Wieser, Deschauer, and Zierz), Martin-Luther-Universität, Halle/Saale, Germany; Institut für Klinische Biochemie (Dr. Olek), Rheinischen Friedrich-Wilhelms-Universität, Bonn, Germany; and Computational Chemistry & Structure (Dr. Hermann), ANADYS Pharmaceuticals, Inc., San Diego, CA.
Address correspondence and reprint requests to Dr. Thomas Wieser, Klinik und Poliklinik für Neurologie, Martin-Luther-Universität Halle/Wittenberg, Ernst-Grube-Str. 40, 06097 Halle/Saale, Germany; e-mail: thomas.wieser{at}medizin.uni-halle.de
The authors investigated 32 patients with the muscle form of CPT II deficiency. Total carnitine palmitoyltransferase enzyme system (CPT) activity was normal but abnormally inhibited by malonyl-CoA, palmitoyl-CoA, and the detergents Triton X and Tween 20. Mutation analysis identified three described mutations (S113L, P50H, and F448L) and two novel mutations (M214T and Y479F). Using modeling techniques, a structure could be identified anchoring the protein in the membrane. Only one of the five mutations (Y479F) is located within this region.
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