Fluorescence spectroscopy was employed to investigate the interaction between fluorophore fluoresceinamine(FA) and bovine serum albumin(BSA) under physiological conditions. In the mechanism discussion, it was proved t...Fluorescence spectroscopy was employed to investigate the interaction between fluorophore fluoresceinamine(FA) and bovine serum albumin(BSA) under physiological conditions. In the mechanism discussion, it was proved that the fluorescence quenching of BSA by FA is a result of the formation of a BSA-FA complex. Fluorescence quenching constants were determined using the modified Stern-Volmer equation to provide a measure of the binding affinity between FA and BSA. The results of the thermodynamic parameters △G, △H, and △S at different temperatures indicated that several kinds of interactions, except for the electrostatic interactions play cooperative roles in BSA-FA association. Furthermore, the conformation of BSA upon interaction with FA was also studied by synchrotron fluorescence spectroscopy.展开更多
凝胶电泳是常用的生化分离鉴定技术。生物分子大多在可见光区完全透明,因此在凝胶电泳之后,需要对凝胶进行染色处理才能观察到结果,而且常规的染色方法一般步骤比较繁琐耗时。本文开发了一种新型的预染色凝胶电泳方法(Pre-Staining Gel ...凝胶电泳是常用的生化分离鉴定技术。生物分子大多在可见光区完全透明,因此在凝胶电泳之后,需要对凝胶进行染色处理才能观察到结果,而且常规的染色方法一般步骤比较繁琐耗时。本文开发了一种新型的预染色凝胶电泳方法(Pre-Staining Gel Electrophoresis,PSGE),可以直观地显示电泳结果,并简化凝胶电泳操作。利用PSGE成功分析了蛋白质与两性高分子聚合物的共价偶联和物理吸附的效率,展示了PSGE的巨大应用开发潜力。展开更多
Strategies for labeling proteins with fluorophores are always important for biotechnology. Here we take a model protein(bovine serum albumin) and a typical fluorophore(rhodamine B) to demonstrate a direct labeling met...Strategies for labeling proteins with fluorophores are always important for biotechnology. Here we take a model protein(bovine serum albumin) and a typical fluorophore(rhodamine B) to demonstrate a direct labeling method just by physical adsorption. In combination with size exclusion chromatography and the Scartchard equation, we have developed a facile analysis method for calculating the binding constant and binding sites.The molecular docking method has been used to study the binding site in amino acid level.展开更多
Bio-nanosensors(Bio-NSs)have attracted much attention recently due to their unique properties.Among all of the bio-NSs,the intracellular proton sensor is significant for biomedicine studies and clinic diagnosis.Proton...Bio-nanosensors(Bio-NSs)have attracted much attention recently due to their unique properties.Among all of the bio-NSs,the intracellular proton sensor is significant for biomedicine studies and clinic diagnosis.Proton nanosensors(PNSs)with different pH sensitive ranges could satisfy different research requirements.Here we report a facile method to build a PNS with a neutral to basic pH sensitive range,in which the commercial pH indicator,fluoresceinamine(FA),was covalently coupled to the carboxylic-rich amphiphilic polymer(AP)coated gold nanoparticles(AuNPs).展开更多
基金Supported by National Natural Science Foundation of China(Nos.21171086 and 81160213)the Inner Mongolia Grassland Talent(No.108-108038)+1 种基金the Inner Mongolia Autonomous Region Natural Science Foundation(No.2013MS1121)the Inner Mongolia Agricultural University(Nos.211-109003 and 211-206038)
文摘Fluorescence spectroscopy was employed to investigate the interaction between fluorophore fluoresceinamine(FA) and bovine serum albumin(BSA) under physiological conditions. In the mechanism discussion, it was proved that the fluorescence quenching of BSA by FA is a result of the formation of a BSA-FA complex. Fluorescence quenching constants were determined using the modified Stern-Volmer equation to provide a measure of the binding affinity between FA and BSA. The results of the thermodynamic parameters △G, △H, and △S at different temperatures indicated that several kinds of interactions, except for the electrostatic interactions play cooperative roles in BSA-FA association. Furthermore, the conformation of BSA upon interaction with FA was also studied by synchrotron fluorescence spectroscopy.
文摘凝胶电泳是常用的生化分离鉴定技术。生物分子大多在可见光区完全透明,因此在凝胶电泳之后,需要对凝胶进行染色处理才能观察到结果,而且常规的染色方法一般步骤比较繁琐耗时。本文开发了一种新型的预染色凝胶电泳方法(Pre-Staining Gel Electrophoresis,PSGE),可以直观地显示电泳结果,并简化凝胶电泳操作。利用PSGE成功分析了蛋白质与两性高分子聚合物的共价偶联和物理吸附的效率,展示了PSGE的巨大应用开发潜力。
基金Supported by the National Natural Science Foundation of China(Nos.21171086 and 81160213)Inner Mongolia Autonomous Region science and Technology Department(No.211-202077)+2 种基金Inner Mongolia Grassland Talent(No.108-108038)Natural Science Foundation of Inner Mongolia Autonomous Region of China(No.2013MS1121)Inner Mongolia Agricultural University(Nos.109-108040,211-109003 and 211-206038)
文摘Strategies for labeling proteins with fluorophores are always important for biotechnology. Here we take a model protein(bovine serum albumin) and a typical fluorophore(rhodamine B) to demonstrate a direct labeling method just by physical adsorption. In combination with size exclusion chromatography and the Scartchard equation, we have developed a facile analysis method for calculating the binding constant and binding sites.The molecular docking method has been used to study the binding site in amino acid level.
基金Supported by grants from the National Natural Science Foundation of China(Nos.21171086 and 81160213)Inner Mongolia Grassland Talent(No.108-108038)+1 种基金Inner Mongolia Autonomous Region Natural Science Foundation(No.2013MS1121)the Inner Mongolia Agricultural University(Nos.211-109003 and 211-206038)
文摘Bio-nanosensors(Bio-NSs)have attracted much attention recently due to their unique properties.Among all of the bio-NSs,the intracellular proton sensor is significant for biomedicine studies and clinic diagnosis.Proton nanosensors(PNSs)with different pH sensitive ranges could satisfy different research requirements.Here we report a facile method to build a PNS with a neutral to basic pH sensitive range,in which the commercial pH indicator,fluoresceinamine(FA),was covalently coupled to the carboxylic-rich amphiphilic polymer(AP)coated gold nanoparticles(AuNPs).
