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Picciocchi, Antoine; Douce, Roland; Alban, Claude
The Journal of biological chemistry, 2003-Jul-04, 20030704, Letnik: 278, Številka: 27Journal Article
In plants, the last step of the biotin biosynthetic pathway is localized in mitochondria. This chemically complex reaction is catalyzed by the biotin synthase protein, encoded by the bio2 gene in Arabidopsis thaliana. Unidentified mitochondrial proteins in addition to the bio2 gene product are obligatory for the reaction to occur. In order to identify these additional proteins, potato mitochondrial matrix was fractionated onto different successive chromatographic columns. Combination experiments using purified Bio2 protein and the resulting mitochondrial matrix subfractions together with a genomic based research allowed us to identify mitochondrial adrenodoxin, adrenodoxin reductase, and cysteine desulfurase (Nfs1) proteins as essential components for the plant biotin synthase reaction. Arabidopsis cDNAs encoding these proteins were cloned, and the corresponding proteins were expressed in Escherichia coli cells and purified. Purified recombinant adrenodoxin and adrenodoxin reductase proteins formed in vitro an efficient low potential electron transfer chain that interacted with the bio2 gene product to reconstitute a functional plant biotin synthase complex. Bio2 from Arabidopsis is the first identified protein partner for this specific plant mitochondrial redox chain.
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