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• W2170857614 startingPage "3682" @default.
• W2170857614 abstract "Mitochondrial fatty acid synthesis (FAS) generates the octanoyl-group that is required for the synthesis of lipoic acid and is linked to mitochondrial RNA metabolism. All of the human enzymes involved in mitochondrial FAS have been characterized except for β-ketoacyl thioester reductase (HsKAR), which catalyzes the second step in the pathway. We report here the unexpected finding that a heterotetramer composed of human 17β-hydroxysteroid dehydrogenase type 8 (/M7β-HSD8) and human carbonyl reductase type 4 (HsCBR4) forms the long-sought HsKAR Both proteins share sequence similarities to the yeast 3-oxoacyl-(acyl carrier protein) reductase (Oarlp) and the bacterial FabG, although HsKAR is NADH dependent, whereas FabG and Oarlp are NADPH dependent. Hs17β-HSD8 and HsCBR4 show a strong genetic interaction in vivo in yeast, where, only if they are expressed together, they rescue the respiratory deficiency and restore the lipoic acid content of oarl∆ cells. Moreover, these two proteins display a stable physical interaction and form an active heterotetramer. Both Hs17β-HSD8 and HsCBR4 are targeted to mitochondria in vivo in cultured HeLa cells. Notably, 17β-HSD8 was previously classified as a steroid-metabolizing enzyme, but our data suggest that 17β-HSD8 is primarily involved in mitochondrial FAS.—Chen, Z., Kastaniotis, A. J., Miinalainen, I. J., Rajaram, V., Wierenga R. K., Hiltunen, J. K. 17β-Hydroxysteroid dehydrogenase type 8 and carbonyl reductase type 4 assemble as a ketoacyl reductase of human mitochondrial FAS. FASEB J. 23, 3682-3691 (2009). www.fasebj.org" @default.
• W2170857614 created "2016-06-24" @default.
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• W2170857614 date "2009-07-01" @default.
• W2170857614 modified "2023-09-25" @default.
• W2170857614 title "17β‐Hydroxysteroid dehydrogenase type 8 and carbonyl reductase type 4 assemble as a ketoacyl reductase of human mitochondrial FAS" @default.
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• W2170857614 doi "https://doi.org/10.1096/fj.09-133587" @default.
• W2170857614 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19571038" @default.
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