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  • Title: Cloning and expression of cDNA for a newly identified isozyme of bovine liver 3-hydroxyacyl-CoA dehydrogenase and its import into mitochondria.
    Author: Furuta S, Kobayashi A, Miyazawa S, Hashimoto T.
    Journal: Biochim Biophys Acta; 1997 Feb 28; 1350(3):317-24. PubMed ID: 9061028.
    Abstract:
    cDNA for a heretofore undescribed mitochondrial 3-hydroxyacyl-CoA dehydrogenase, designated as the type II enzyme with different molecular and catalytic properties, compared to those of the classical mitochondrial beta-oxidation enzyme (type I enzyme), was cloned from a bovine liver cDNA library. Nucleotide sequence of the cDNA encoded 261 amino acids with a subunit molecular weight of 27,140. The deduced primary structure of the type II enzyme showed no significant homology to the reported amino acid sequence of the classical 3-hydroxyacyl-CoA dehydrogenases. On SDS-PAGE, no differences in subunit molecular weights were observed among the in vitro translation products, the recombinant type II enzyme produced in Escherichia coli and the purified enzyme. NH2-terminal and COOH-terminal amino acid sequence analysis of the purified type II enzyme revealed that the mature enzyme had not been proteolytically processed. The in vitro translation products of the type II enzyme were efficiently incorporated into isolated rat liver mitochondria, without changes in size, thereby suggesting that unlike other mitochondrial enzymes of fatty acid beta-oxidation, the type II enzyme had no cleavable signal peptide upon import into mitochondria.
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