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pubmed-article:17369348pubmed:abstractTextThe production of 1,4-dihydroxy-2-naphthoic acid (DHNA) was investigated using a fed-batch culture of Propionibacterium freudenreichii ET-3. DHNA is a precursor of menaquinone (MK) and is transformed to MK by combination with an isoprenoid unit. We found that ET-3 stopped MK production and increased DHNA production in an anaerobic fed-batch culture by maintaining the lactose concentration at approximately zero. The maximum DHNA concentration observed in the anaerobic fed-batch culture was markedly higher than the maximum DHNA concentration observed in an anaerobic batch culture. Moreover, MK or DHNA production was affected by the lactose feeding rate; this suggests that lactose metabolism participates in the syntheses of these products. On the other hand, accumulation of propionate was found to inhibit DHNA production in the fed-batch culture. Based on the fact that ET-3 increases DHNA production in an aerobic culture by consuming propionate, we carried out a cultivation experiment in which an anaerobic fed-batch culture was switched to an anaerobic batch culture and found that the DHNA production was increased to a greater extent than the DHNA production in an anaerobic fed-batch culture. These results suggest that DHNA production by ET-3 is markedly influenced by carbon source limitation and the oxygen supply.lld:pubmed
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pubmed-article:17369348pubmed:authorpubmed-author:ShioyaSuteaki...lld:pubmed
pubmed-article:17369348pubmed:authorpubmed-author:NinomiyaKazua...lld:pubmed
pubmed-article:17369348pubmed:authorpubmed-author:KatakuraYoshi...lld:pubmed
pubmed-article:17369348pubmed:authorpubmed-author:FuruichiKeisu...lld:pubmed
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pubmed-article:17369348pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:17369348pubmed:articleTitleEnhancement of 1,4-dihydroxy-2-naphthoic acid production by Propionibacterium freudenreichii ET-3 fed-batch culture.lld:pubmed
pubmed-article:17369348pubmed:affiliationFood Technology Research Institute, Meiji Dairies Corporation, 540 Naruda, Odawara, Kanagawa 250-0862, Japan. keisuke_furuichi@meiji-milk.comlld:pubmed
pubmed-article:17369348pubmed:publicationTypeJournal Articlelld:pubmed
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