A mutant (GQQ-M6) of a Sponge-Derived streptomyces sp. GQQ-10 obtained by UV-induced mutation was used for producing prodiginines (PGs). Single factor experiments and orthogonal array design (OAD) methods were employe...A mutant (GQQ-M6) of a Sponge-Derived streptomyces sp. GQQ-10 obtained by UV-induced mutation was used for producing prodiginines (PGs). Single factor experiments and orthogonal array design (OAD) methods were employed for medium optimization. In the single factor method, the effects of soluble starch, glucose, soybean flour, yeast extract and sodium acetate on PGs production were investigated individually. In the subsequent OAD experiments, the concentrations of these 5 key nutritional components combined with salinity were further adjusted. The mutant strain GQQ-M6 gave a 2.2-fold higher PGs production than that of the parent strain; OAD experiments offered a PGs yield of 61mg L-1, which was 10 times higher than that of the initial GQQ-10 strain under the original cultivation mode.展开更多
Background: The disclosure of the poplar genome strengthens its position as well-established model organism. Populus has been subject of several proteome studies, but up to date no comparative study was performed on ...Background: The disclosure of the poplar genome strengthens its position as well-established model organism. Populus has been subject of several proteome studies, but up to date no comparative study was performed on the extraction method of soluble proteins for this species. The extraction is the most critical step in two-dimensional gel electrophoresis and each extraction method has its advantages, disadvantages and limitations. Therefore protein extraction methods should be optimized for each tissue before starting an experimental setup. In prospect of future DIGE (Differential Gel electrophoresis) experiments for the investigation of the effects of cadmium and inoculation with plant growth promoting bacteria at the proteome level, the aim of this study was to optimize an extraction method for soluble proteins of poplar leaves and roots. Results: The acetone-phenol extraction method was found to be the most suited, rendering a high spot number and low background interference. During further optimization, several critical steps in the extraction method were revealed. Conclusion: Aiming to optimize the extraction of soluble leaf and root proteins of Populus deltoides × (trichocarpa× deltoides) compatible with DIGE analysis, a protocol rendering high reproducibility, low background interference and a high spot number was established, however no novel insights were acquired.展开更多
基金supported by the National Natural Science Foundation of China (Nos.30973627 and 30772640)the public projects of the State Oceanic Administration (No.2010418022-3)+1 种基金the Program for Changjiang Scholars and Innovative Research Team in University (No.IRT0944)the Natural Science Fund of Shandong Province,P.R.China (No.ZR2009CZ016)
文摘A mutant (GQQ-M6) of a Sponge-Derived streptomyces sp. GQQ-10 obtained by UV-induced mutation was used for producing prodiginines (PGs). Single factor experiments and orthogonal array design (OAD) methods were employed for medium optimization. In the single factor method, the effects of soluble starch, glucose, soybean flour, yeast extract and sodium acetate on PGs production were investigated individually. In the subsequent OAD experiments, the concentrations of these 5 key nutritional components combined with salinity were further adjusted. The mutant strain GQQ-M6 gave a 2.2-fold higher PGs production than that of the parent strain; OAD experiments offered a PGs yield of 61mg L-1, which was 10 times higher than that of the initial GQQ-10 strain under the original cultivation mode.
文摘Background: The disclosure of the poplar genome strengthens its position as well-established model organism. Populus has been subject of several proteome studies, but up to date no comparative study was performed on the extraction method of soluble proteins for this species. The extraction is the most critical step in two-dimensional gel electrophoresis and each extraction method has its advantages, disadvantages and limitations. Therefore protein extraction methods should be optimized for each tissue before starting an experimental setup. In prospect of future DIGE (Differential Gel electrophoresis) experiments for the investigation of the effects of cadmium and inoculation with plant growth promoting bacteria at the proteome level, the aim of this study was to optimize an extraction method for soluble proteins of poplar leaves and roots. Results: The acetone-phenol extraction method was found to be the most suited, rendering a high spot number and low background interference. During further optimization, several critical steps in the extraction method were revealed. Conclusion: Aiming to optimize the extraction of soluble leaf and root proteins of Populus deltoides × (trichocarpa× deltoides) compatible with DIGE analysis, a protocol rendering high reproducibility, low background interference and a high spot number was established, however no novel insights were acquired.