Abstract
L-β-Hydroxyacid dehydrogenase ( L-β-hydroxyacid--NAD-oxidoreductase, EC 1.1.1.45) of Drosophila is composed of two, identical subunits with a molecular weight of approx. 33 300. The enzyme was purified 938-fold from Drosophila melanogaster. An isoelectric point of 8.6 was determined for L-β-hydroxyacid dehydrogenase. An amino acid analysis was conducted of the purified enzyme. A single subunit was obtained by SDS-gel electrophoresis of the purified enzyme. Translation of larval and adult mRNA in a mRNA-dependent reticulocyte lysate, followed by immune precipitation using anti- L-β-hydroxyacid dehydrogenase IgG revealed a single L-β-hydroxyacid dehydrogenase subunit of 33 300. Larval and adult proteins were the same size. The enzyme does not appear to be subjected to substantial post-translational modifications.
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