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Anal Biochem. 2012 Dec 1;431(1):1-3. doi: 10.1016/j.ab.2012.08.001. Epub 2012 Aug 9.

A regularly spaced and self-revealing protein ladder for anti-tag Western blot analysis.

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  • 1Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.


We designed a protein ladder (hereafter referred to as "Mega-tag") that contains 14 of the most commonly used epitope tags fused to molecular weight markers. The Mega-tag ladder can be simultaneously visualized when anti-tag antibodies are used to detect epitope-tagged recombinant proteins in Western blots. The logarithm of molecular weights and relative mobility of the Mega-tag protein ladder are highly correlated (R(2)=0.997±0.00232), indicating that the dye-free Mega-tag protein ladder is accurate. It can also serve as a positive control for anti-epitope tag immunoblots. The Mega-tag protein ladder should provide a convenient and precise tool for Western blot analysis.

Copyright © 2012 Elsevier Inc. All rights reserved.

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