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

Chien Han Kao, Chiu Min Cheng, Kuo Hsiang Chuang, Chih Hung Chuang, Shey Cherng Tzou, Ta Chun Cheng, Yuan Chin Hsieh, Kuang Wen Liao, Yun Ming Wang, Long Sen Chang, Steve R. Roffler, Fang Ming Chen, Tian Lu Cheng

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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 (R2= 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.

Original languageEnglish
Pages (from-to)1-3
Number of pages3
JournalAnalytical Biochemistry
Issue number1
Publication statusPublished - Dec 1 2012


  • 14-Epitope tag protein ladder
  • Anti-epitope tag antibodies
  • Epitope tags
  • Protein molecular estimation
  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis
  • Western blot analysis

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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