• 제목/요약/키워드: validamycin biosynthesis

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Characterization of D-Glucose ${\alpha}$-1-Phosphate Uridylyltransferase (VldB) and Glucokinase (VIdC) Involved in Validamycin Biosynthesis of Streptomyces hygroscopicus var. limoneus KCCM 11405

  • Seo Myung-Ji;Im Eun-Mi;Singh Deepak;Rajkarnikar Arishma;Kwon Hyung-Jin;Hyun Chang-Gu;Suh Joo-Won;Pyun Yu-Ryang;Kim Soon-Ok
    • Journal of Microbiology and Biotechnology
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    • 제16권8호
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    • pp.1311-1315
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    • 2006
  • Aminocyclitol antibiotic validamycin A, a prime control agent for sheath blight disease of rice plants, is biosynthesized by Streptomyces hygroscopicus var. limoneus. Within the validamycin biosynthetic gene cluster, vldBC forms an operon of vldABC with vidA, the gene encoding 2-epi-5-epi-valiolone synthase. Biochemical studies, employing the recombinant proteins from Escherichia coli, established VldB and VldC as D-glucose $\alpha$-1-phosphate uridylyltransferase and glucokinase, respectively. This finding substantiates that the validamycin biosynthetic gene cluster harbors genes encoding the enzymes for UDP-glucose formation from glucose. Therefore, we propose that validamycin biosynthesis employs its own catalysts to generate UDP-glucose, but not depending on the primary metabolism.