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Genetic engineering of shikonin biosynthesis hairy root cultures of Lithospermum erythrorhizon transformed with the bacterial ubiC gene

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Abstract

The biosynthetic pathway to 4-hydroxybenzoate (4HB), a precursor of the naphthoquinone pigment shikonin, was modified in Lithospermum erythrorhizon hairy root cultures by introduction of the bacterial gene ubiC. This gene of Escherichia coli encodes chorismate pyruvate-lyase (CPL), an enzyme that converts chorismate into 4HB and is not normally present in plants. The ubiC gene was fused to the sequence for a chloroplast transit peptide and placed under control of a constitutive plant promoter. This construct was introduced into L. erythrorhizon by Agrobacterium rhizogenes-mediated transformation.

The resulting hairy root cultures showed high CPL activity. 4HB produced by the CPL reaction was utilized for shikonin biosynthesis, as shown by in vivo inhibition of the native pathway to 4HB with 2-aminoindan-2-phosphonic acid (AIP), an inhibitor of phenylalanine ammonia-lyase. A feeding experiment with [1,7-13C2]shikimate showed that in the absence of AIP the artificially introduced CPL reaction contributed ca. 20% of the overall 4HB biosynthesis in the transgenic cultures. ubiC transformation did not lead to a statistically significant increase of shikonin formation, but to a 5-fold increase of the accumulation of menisdaurin, a nitrile glucoside which is presumably related to aromatic amino acid metabolism.

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Authors and Affiliations

  1. Pharmazeutisches Institut, Universität Tübingen, Auf der Morgenstelle 8, 72076, Tübingen, Germany

    Susanne Sommer, Annegret Köhle, Andreas Bechthold & Lutz Heide

  2. Laboratory of Molecular & Cellular Biology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa, Kyoto, 606-01, Japan

    Kazufumi Yazaki

  3. Tsukuba Medicinal Plant Research Station, National Institute of Health Sciences, Tsukuba, Ibaraki, 305-0843, Japan

    Koichiro Shimomura

Authors
  1. Susanne Sommer
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  2. Annegret Köhle
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  3. Kazufumi Yazaki
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  4. Koichiro Shimomura
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  5. Andreas Bechthold
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  6. Lutz Heide
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Sommer, S., Köhle, A., Yazaki, K. et al. Genetic engineering of shikonin biosynthesis hairy root cultures of Lithospermum erythrorhizon transformed with the bacterial ubiC gene. Plant Mol Biol 39, 683–693 (1999). https://doi.org/10.1023/A:1006185806390

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