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RISS 인기검색어
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- 저자 : Gongyuan Wei (검색결과 5 건)
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Gongyuan Wei,Min Nie,Na Shao,Xiaoguang Ge 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
Efficient glutathione production by high-cell-density cultivation of Candida utilis was investigated. A series of batch glutathione fermentations were carried out and the optimal initial glucose concentration was found to be about 26 g/L. Then, fed-batch fermentation under diverse feeding strategies was used to enhance glutathione production with a total glucose concentration of 150 g/L. Constant glucose feeding strategy cannot meet the requirement of cells at the late period of feeding, while exponential glucose feeding strategy cannot satisfy the needs of cells at the beginning of feeding. Based on the results above, a polynomial glucose feeding strategy was developed to provide enough glucose for cells along with the cultivation, under which both the cell and glutathione productivity were satisfactorily improved. Furthermore, fed-batch fermentation under this strategy with a total glucose concentration of 200 g/L was successfully performed, the dry cell weight and glutathione concentration reached 91.2 g/L and 825 mg/L, respectively.
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Gongyuan Wei,Dahui Wang,Min Nie,Jian Chen 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.2
Several inorganic/organic N-containing substances were tested as nitrogen source for efficient glutathione production by C. utilis WSH 02-08. Although the strain could assimilate all the inorganic/organic nitrogen, urea and ammonium sulfate were found more favorable to cell growth and glutathione biosynthesis in a flask, respectively, and an optimal C/N ratio existed for each as 5.6 mol/mol and 8.3 mol/mol. A mixed nitrogen source of urea and ammonium under diverse C/N ratios could not boost glutathione fermentation despite the many mixed strategies that were introduced. Batch glutathione production in a stirred fermentor, using the sole or mixed nitrogen sources of urea and ammonium sulfate under their optimal C/N ratios, were conducted; urea was further proved to be the best nitrogen source for glutathione production. The reason was then quantitatively described by kinetic model, together with the distribution of flux for metabolites in metabolic network of glutathione biosynthesis by C. utilis WSH 02-08.
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Gongyuan Wei,Na Shao,Dahui Wang,Qianpeng Zhang,Xiaoguang Ge,Min Nie 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
An effective S-adenosylmethionine and glutathione enriching yeast mutant of Candida utilis CCTCC M 209298 was first screened from plates containing 0.5 g/L of DL-ethionine by complex mutagenesis with UV and γ-ray in this study. Medium components optimization for enhanced co-production of S-adenosylmethionine and glutathione by C. utilis CCTCC M 209298 was further carried out using response surface methodology. The significant factors influencing S-adenosylmethionine and glutathione co-production were selected by Plackett-Burman design as sucrose, KH2PO4 and L-methionine, and Box-Behnken design was applied for further optimization studies. Based on these approaches, the optimized concentrations on medium components for higher co-production of S-adenosylmethionine and glutathione were sucrose 35.4 g/L, (NH4)2SO4 10 g/L, KH2PO4 12.3 g/L, MgSO4·7H2O, 0.05 g/L, CaCl20.05 g/L and L-methionine 4.6 g/L. The medium optimization by response surface methodology led to a total production of 589.3 mg/L on S-adenosylmethionine and glutathione, which was 2.4-fold increased compared with the medium without optimization.
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Wang, Chonglong,Zada, Bakht,Wei, Gongyuan,Kim, Seon-Won Elsevier 2017 Bioresource technology Vol.241 No.-
<P><B>Abstract</B></P> <P>Isoprenoids comprise the largest family of natural organic compounds with many useful applications in the pharmaceutical, nutraceutical, and industrial fields. Rapid developments in metabolic engineering and synthetic biology have facilitated the engineering of isoprenoid biosynthetic pathways in <I>Escherichia coli</I> to induce high levels of production of many different isoprenoids. In this review, the stem pathways for synthesizing isoprene units as well as the branch pathways deriving diverse isoprenoids from the isoprene units have been summarized. The review also highlights the metabolic engineering efforts made for the biosynthesis of hemiterpenoids, monoterpenoids, sesquiterpenoids, diterpenoids, carotenoids, retinoids, and coenzyme Q<SUB>10</SUB> in <I>E</I>. <I>coli</I>. Perspectives and future directions for the synthesis of novel isoprenoids, decoration of isoprenoids using cytochrome P450 enzymes, and secretion or storage of isoprenoids in <I>E</I>. <I>coli</I> have also been included.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This review covered production of isoprenoid in <I>E</I>. <I>coli</I> over decades. </LI> <LI> This review summarized progresses of pathway engineering for isoprenoid production. </LI> <LI> This review suggested three directions for isoprenoid production in the future. </LI> </UL> </P>
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