分析米曲霉AS3.951(沪酿3.042)种曲培养过程中不同培养时间的胞外蛋白谱,确定培养时间为48h时种曲达到蛋白鉴定要求;采用基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF/TOFMS)技术检测鉴定出SDS-PAGE胶图上11个蛋白条带,通过比对数据库...分析米曲霉AS3.951(沪酿3.042)种曲培养过程中不同培养时间的胞外蛋白谱,确定培养时间为48h时种曲达到蛋白鉴定要求;采用基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF/TOFMS)技术检测鉴定出SDS-PAGE胶图上11个蛋白条带,通过比对数据库鉴定得到8个蛋白,其中包括α-淀粉酶、淀粉糖化酶B、碱性蛋白酶、酸性蛋白酶等,与已在2009年Biosci Biotechnol Biochem期刊发表的《Analysis of extra cell ular proteins of Asper gillus oryzae grown on soy sauce koji》米曲霉AS3.951大曲的分泌蛋白谱共同提供了米曲霉沪酿AS3.951在酱油制曲过程中较完整的胞外分泌蛋白谱。展开更多
In order to obtain an industrial strain with a higher L（＋）-lactic acid yield, the strain Rhizopus oryzae RF3608 was mutated by means of nitrogen ion beam implantation and the mutant strain RLC41-6 was isolated. Und...In order to obtain an industrial strain with a higher L（＋）-lactic acid yield, the strain Rhizopus oryzae RF3608 was mutated by means of nitrogen ion beam implantation and the mutant strain RLC41-6 was isolated. Under optimal conditions the yield of L（＋）-lactic acid produced in a shake-flask reached 133 g/L - 137 g/L after 36 h cultivation, indicating that the conversion rate based on glucose was as high as 88% - 91% and the productivity was 3.75 g/L.h. It was almost a 115% increase in lactic acid production compared with the original strain RF3608.展开更多
In order to obtain an industrial strain with a higher L（＋）-lactic acid yield, the strain Rhizopus oryzae PW352 was mutated by means of nitrogen ion beam implantation and the mutant strain Rhizopus oryzae RLC41-6 wa...In order to obtain an industrial strain with a higher L（＋）-lactic acid yield, the strain Rhizopus oryzae PW352 was mutated by means of nitrogen ion beam implantation and the mutant strain Rhizopus oryzae RLC41-6 was obtained. An experimental finding was made in surprise that Rhizopus oryzae mutant RLC41-6 is not only an L（＋）-lactic acid producer from corn starch but also an efficient producer of L（＋）-lactic acid from xylose. Under optimal conditions, the production of L（＋）-lactic acid from 100 g/L xylose reached 77.39 g/L after 144 h fed-batch fermentation, A high mutation rate and a wide mutation spectrum of low-energy ion implantation were observed in the experiment.展开更多
The wild type strain Rhizopus oryzae PW352 was mutated by means of nitrogen ion implantation （15 keV, 7.8×10^14 ～ 2.08 ×10^15 ions/cm^2） to find an industrial strain with a higher L（＋）-lactic acid yiel...The wild type strain Rhizopus oryzae PW352 was mutated by means of nitrogen ion implantation （15 keV, 7.8×10^14 ～ 2.08 ×10^15 ions/cm^2） to find an industrial strain with a higher L（＋）-lactic acid yield, and two mutants RE3303 and RF9052 were isolated. In order to discuss the mechanism primarily, Lactate Dehydrogenase of Rhizopus oryzae was studied. While the two mutants produced L（＋）-lactic acid by 75% more than the wild strain did, their specific activity of Lactate Dehydrogenase was found to be higher than that in the wild strain. The optimum temperature of Lactate Dehydrogenase in Rhizopus oryzae RF9052 was higher. Compared to the wild strain, the Michaelis constant （Km） value of Lactate Dehydrogenase in the mutants was Changed. All these changes show that L（＋）-lactic acid production has a correlation with the specific activity of Lactate Dehydrogenase. The low-energy ions, implanted into the strain, may improve the specific activity of Lactate Dehydrogenase by influencing its gene structure and protein structure.展开更多
文摘分析米曲霉AS3.951(沪酿3.042)种曲培养过程中不同培养时间的胞外蛋白谱,确定培养时间为48h时种曲达到蛋白鉴定要求;采用基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF/TOFMS)技术检测鉴定出SDS-PAGE胶图上11个蛋白条带,通过比对数据库鉴定得到8个蛋白,其中包括α-淀粉酶、淀粉糖化酶B、碱性蛋白酶、酸性蛋白酶等,与已在2009年Biosci Biotechnol Biochem期刊发表的《Analysis of extra cell ular proteins of Asper gillus oryzae grown on soy sauce koji》米曲霉AS3.951大曲的分泌蛋白谱共同提供了米曲霉沪酿AS3.951在酱油制曲过程中较完整的胞外分泌蛋白谱。
基金The project supported by the Tenth Five-Year Plan Period National Key Technologies R & D Program of China (under GrantNo. 2001BA302B)
文摘In order to obtain an industrial strain with a higher L（＋）-lactic acid yield, the strain Rhizopus oryzae RF3608 was mutated by means of nitrogen ion beam implantation and the mutant strain RLC41-6 was isolated. Under optimal conditions the yield of L（＋）-lactic acid produced in a shake-flask reached 133 g/L - 137 g/L after 36 h cultivation, indicating that the conversion rate based on glucose was as high as 88% - 91% and the productivity was 3.75 g/L.h. It was almost a 115% increase in lactic acid production compared with the original strain RF3608.
基金supported by the Key‘863’Fund of China (No.2006AA020102)Key Technology Research and Development Program of Anhui Province in 2007 (No.07010202076)
文摘In order to obtain an industrial strain with a higher L（＋）-lactic acid yield, the strain Rhizopus oryzae PW352 was mutated by means of nitrogen ion beam implantation and the mutant strain Rhizopus oryzae RLC41-6 was obtained. An experimental finding was made in surprise that Rhizopus oryzae mutant RLC41-6 is not only an L（＋）-lactic acid producer from corn starch but also an efficient producer of L（＋）-lactic acid from xylose. Under optimal conditions, the production of L（＋）-lactic acid from 100 g/L xylose reached 77.39 g/L after 144 h fed-batch fermentation, A high mutation rate and a wide mutation spectrum of low-energy ion implantation were observed in the experiment.
基金National Natural Science Foundation of China(No.20576132)
文摘The wild type strain Rhizopus oryzae PW352 was mutated by means of nitrogen ion implantation （15 keV, 7.8×10^14 ～ 2.08 ×10^15 ions/cm^2） to find an industrial strain with a higher L（＋）-lactic acid yield, and two mutants RE3303 and RF9052 were isolated. In order to discuss the mechanism primarily, Lactate Dehydrogenase of Rhizopus oryzae was studied. While the two mutants produced L（＋）-lactic acid by 75% more than the wild strain did, their specific activity of Lactate Dehydrogenase was found to be higher than that in the wild strain. The optimum temperature of Lactate Dehydrogenase in Rhizopus oryzae RF9052 was higher. Compared to the wild strain, the Michaelis constant （Km） value of Lactate Dehydrogenase in the mutants was Changed. All these changes show that L（＋）-lactic acid production has a correlation with the specific activity of Lactate Dehydrogenase. The low-energy ions, implanted into the strain, may improve the specific activity of Lactate Dehydrogenase by influencing its gene structure and protein structure.
