KMID : 1094720070120020092
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Biotechnology and Bioprocess Engineering 2007 Volume.12 No. 2 p.92 ~ p.99
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Isocitrate dehydrogenase and isocitrate lyase are essential enzymes for riboflavin production in Ashbya gossypii
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Kanamasa Shin
Tajima Satoshi Park Enoch Y.
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Abstract
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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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KEYWORD
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Ashbya gossypi, NAD +-dependent isocitrate dehydrogenase 1, isocitrate lyase, riboflavin production, gene disruption
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