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Isocitrate dehydrogenase and isocitrate lyase are essential enzymes for riboflavin production inAshbya gossypii

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Abstract

For this study, we hypothesized that mitochondrial NAD+-dependent isocitrate dehydrogenase 1 (ICDH1) and isocitrate lyase (ICL1) were important enzymes for riboflavin synthesis in the fungusAshbya gossypii. Here, the genes encoding ICDH1 and ICL1 were disrupted in order to analyze the enzymes' functions on riboflavin production by the fungus. The riboflavin production resulting from these disruptants was markedly decreased compared to the concentration produced by its parental strain when cultured in a rich nutrient medium used to optimize riboflavin production. Furthermore, when comparing the transcription levels of the genes encoding ICDH1 and ICL1, between wild-typeA. gossypii and an itaconate resistant mutant ofA. gossypii obtained by UV irradiation, the mRNA levels in the mutant were 1.8- and 2.0-fold higher than those in the wild-type strain, respectively. These results indicate that ICDH1 and ICL1 are key enzymes for riboflavin synthesis inA. gossypii.

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Authors and Affiliations

  1. JST Innovation Satellite Shizuoka, Japan Science and Technology Agency, 3-5-1-Johoku, Naka-ku, 432-8561, Hamamatsu, Japan

    Shin Kanamasa

  2. Laboratory of Biotechnology, Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, 422-8529, Shizuoka, Japan

    Shin Kanamasa & Enoch Y. Park

  3. Laboratory of Biotechnology, Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga-ku, 422-8529, Shizuoka, Japan

    Satoshi Tajima & Enoch Y. Park

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  1. Shin Kanamasa
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  2. Satoshi Tajima
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  3. Enoch Y. Park
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Correspondence to Enoch Y. Park.

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Kanamasa, S., Tajima, S. & Park, E.Y. Isocitrate dehydrogenase and isocitrate lyase are essential enzymes for riboflavin production inAshbya gossypii . Biotechnol. Bioprocess Eng. 12, 92–99 (2007). https://doi.org/10.1007/BF03028632

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  • DOI: https://doi.org/10.1007/BF03028632

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