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总蛋白还是高丰度蛋白:哪种为蛋白质印迹法提供最佳上样对照?

Total protein or high-abundance protein: Which offers the best loading control for Western blotting?

作者信息

Thacker Jonathan S, Yeung Derrick H, Staines W Richard, Mielke John G

机构信息

Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

School of Public Health and Health Systems, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

出版信息

Anal Biochem. 2016 Mar 1;496:76-8. doi: 10.1016/j.ab.2015.11.022. Epub 2015 Dec 17.

Abstract

Western blotting routinely involves a control for variability in the amount of protein across immunoblot lanes. Normalizing a target signal to one found for an abundantly expressed protein is widely regarded as a reliable loading control; however, this approach is being increasingly questioned. As a result, we compared blotting for two high-abundance proteins (actin and glyceraldehyde 3-phosphate dehydrogenase [GAPDH]) and two total protein membrane staining methods (Ponceau and Coomassie Brilliant Blue) to determine the best control for loading variability. We found that Ponceau staining optimally balanced accuracy and precision, and we suggest that this approach be considered as an alternative to normalizing with a high-abundance protein.

摘要

蛋白质印迹法通常需要对免疫印迹泳道间蛋白质含量的变异性进行对照。将目标信号标准化为一种高表达蛋白质的信号,这一方法被广泛认为是一种可靠的上样对照;然而,这种方法正越来越受到质疑。因此,我们比较了两种高丰度蛋白质(肌动蛋白和甘油醛-3-磷酸脱氢酶[GAPDH])的印迹以及两种总蛋白膜染色方法(丽春红和考马斯亮蓝),以确定对上样变异性的最佳对照。我们发现丽春红染色在准确性和精密度之间达到了最佳平衡,我们建议将这种方法视为用高丰度蛋白质进行标准化的替代方法。

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