Confocal laser scanning microscopy was used to observe the spatio-temporal expression of the pathway-specific gene redD during S. coelicolor cell cultivation. The corresponding mutant S. coelicolor lyqRY1522 carrying ...Confocal laser scanning microscopy was used to observe the spatio-temporal expression of the pathway-specific gene redD during S. coelicolor cell cultivation. The corresponding mutant S. coelicolor lyqRY1522 carrying redD::eyfp in the chro- mosome was constructed. The temporal expression results of the fusion protein during submerged cultivation demonstrated that expression of redD began in the transition phase, continuing through the exponential growth phase to the stationary phase, and reached maximum in the stationary phase. On the other hand, redD was expressed only in substrate mycelia during solid-state culture, while aerial mycelia remained essentially non-fluorescent throughout culture. Results demonstrated that the expression pattern of redD coincides with that of the biosynthesis of the antibiotics during culture, revealing a direct correlation between the spatio-temporal distribution of regulatory gene expression and second metabolism.展开更多
目的：研究多聚甲醛固定对利用荧光共振能量转移（fluorescence resonance energy transfer，FRET）检测细胞中蛋白质相互作用的影响，解决运动能力较强的细胞中FRET效率检测的问题。方法：选用两个已知能够相互作用的蛋白分子TRA和TRB...目的：研究多聚甲醛固定对利用荧光共振能量转移（fluorescence resonance energy transfer，FRET）检测细胞中蛋白质相互作用的影响，解决运动能力较强的细胞中FRET效率检测的问题。方法：选用两个已知能够相互作用的蛋白分子TRA和TRB，将荧光蛋白ECFP和EYFP的编码基因通过融合PCR分别标记在其C端；将两个融合基因共转染靶细胞，一组细胞经低浓度（0．5％）多聚甲醛短时（0．5～1h）固定，另一组不固定，利用激光共聚焦扫描显微镜检测两个融合蛋白之间的FRET效率，比较其在两组细胞之间的差异情况。结果：经过统计学分析，在活细胞和经低浓度多聚甲醛短时间固定的细胞中，ECFP与EYFP之间的FRET效率没有显著差异。结论：低浓度短时间的多聚甲醛固定对于荧光蛋白分子之间的相互作用没有显著的影响，因此对于运动能力过强的细胞可以固定后再进行FRET检测。展开更多
基金Project (No. 2004-527) supported by the Scientific Research Foun-dation for the Returned Overseas Chinese Scholars, State EducationMinistry, China
文摘Confocal laser scanning microscopy was used to observe the spatio-temporal expression of the pathway-specific gene redD during S. coelicolor cell cultivation. The corresponding mutant S. coelicolor lyqRY1522 carrying redD::eyfp in the chro- mosome was constructed. The temporal expression results of the fusion protein during submerged cultivation demonstrated that expression of redD began in the transition phase, continuing through the exponential growth phase to the stationary phase, and reached maximum in the stationary phase. On the other hand, redD was expressed only in substrate mycelia during solid-state culture, while aerial mycelia remained essentially non-fluorescent throughout culture. Results demonstrated that the expression pattern of redD coincides with that of the biosynthesis of the antibiotics during culture, revealing a direct correlation between the spatio-temporal distribution of regulatory gene expression and second metabolism.
文摘目的：研究多聚甲醛固定对利用荧光共振能量转移（fluorescence resonance energy transfer，FRET）检测细胞中蛋白质相互作用的影响，解决运动能力较强的细胞中FRET效率检测的问题。方法：选用两个已知能够相互作用的蛋白分子TRA和TRB，将荧光蛋白ECFP和EYFP的编码基因通过融合PCR分别标记在其C端；将两个融合基因共转染靶细胞，一组细胞经低浓度（0．5％）多聚甲醛短时（0．5～1h）固定，另一组不固定，利用激光共聚焦扫描显微镜检测两个融合蛋白之间的FRET效率，比较其在两组细胞之间的差异情况。结果：经过统计学分析，在活细胞和经低浓度多聚甲醛短时间固定的细胞中，ECFP与EYFP之间的FRET效率没有显著差异。结论：低浓度短时间的多聚甲醛固定对于荧光蛋白分子之间的相互作用没有显著的影响，因此对于运动能力过强的细胞可以固定后再进行FRET检测。
