A sequential statistical approach was applied to optimizing the fermentation medium of epothilones（Epos） production by means of a mutant which was obtained by treating polyangium cellulosum ATCC 15384 with nitrite a...A sequential statistical approach was applied to optimizing the fermentation medium of epothilones（Epos） production by means of a mutant which was obtained by treating polyangium cellulosum ATCC 15384 with nitrite and ultraviolet. The effects of different carbon sources and nitrogen sources on the fermentation medium were tested, and the suitable ones were selected. Then a uniform design was employed to design the experiments. A linear model was developed for identifying the significant components in fermentation medium, while a third degree polynomial model was used for studying the relationship between the concentration of the components in fermentation medium and the yield of Epos（YEPs）. A pattern search method was used for searching the optimum fermentation medium in the test space, which was as follows（g/L）： potassium nitrate 8.00, soybean peptone 17.60, potassium hydrogen phos- phate 1.00, beef extraction 6.46, yeast extraction 1.00, calcium chloride 0.25, sodium chloride 1.00 and ferric chloride 0.02. The optimum fermentation medium was expected to result in a yield of Epos（YEPs） of 2.48 mg/L. The validation experiments with the optimum medium were performed in triplicate and the average yield of Epos was 2.45 mg/L which was 7.78 times higher than that of Epos prepared without optimization.展开更多
Four natural epothilone analogues, including two 14-membered epothilones L （1）, L1 （2） and two epoxide opened epothilones A （3） and B （4）, were isolated from the extract of fermentation adsorber resin of Soran...Four natural epothilone analogues, including two 14-membered epothilones L （1）, L1 （2） and two epoxide opened epothilones A （3） and B （4）, were isolated from the extract of fermentation adsorber resin of Sorangium cellulosum strain So0157-2. Their structures were elucidated on the basis of comprehensive NMR and MS data. They are all isolated from the wild type S. cellulosum strain So0157-2 as natural products for the first time.展开更多
基金Supported by the Science Technology Development Project of Jilin Province,China(No.20020503-2)
文摘A sequential statistical approach was applied to optimizing the fermentation medium of epothilones（Epos） production by means of a mutant which was obtained by treating polyangium cellulosum ATCC 15384 with nitrite and ultraviolet. The effects of different carbon sources and nitrogen sources on the fermentation medium were tested, and the suitable ones were selected. Then a uniform design was employed to design the experiments. A linear model was developed for identifying the significant components in fermentation medium, while a third degree polynomial model was used for studying the relationship between the concentration of the components in fermentation medium and the yield of Epos（YEPs）. A pattern search method was used for searching the optimum fermentation medium in the test space, which was as follows（g/L）： potassium nitrate 8.00, soybean peptone 17.60, potassium hydrogen phos- phate 1.00, beef extraction 6.46, yeast extraction 1.00, calcium chloride 0.25, sodium chloride 1.00 and ferric chloride 0.02. The optimum fermentation medium was expected to result in a yield of Epos（YEPs） of 2.48 mg/L. The validation experiments with the optimum medium were performed in triplicate and the average yield of Epos was 2.45 mg/L which was 7.78 times higher than that of Epos prepared without optimization.
基金supported by Key Program of International Cooperation, Ministry of Science and Technology of China (No.2007DFA30970)the 863 Program of China (No. 20060102Z1083)~~
基金National Natural Science Fund for Distinguished Young Scholars (Grant No.30325044,30825001)the 863 Program of China (Grant No.20060102Z1083)
文摘Four natural epothilone analogues, including two 14-membered epothilones L （1）, L1 （2） and two epoxide opened epothilones A （3） and B （4）, were isolated from the extract of fermentation adsorber resin of Sorangium cellulosum strain So0157-2. Their structures were elucidated on the basis of comprehensive NMR and MS data. They are all isolated from the wild type S. cellulosum strain So0157-2 as natural products for the first time.
