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Epitope tagging is a powerful technique to characterize a recombinantly expressed protein encoded by cDNA without the purification of the protein and the immunization of animals. In some cases, however, the expression of a tagged protein is too low to analyze by Western blot. We have developed a simple method to generate tandem repetitive nucleotide sequence by PCR, which allows us to label a protein of interest with a multiple-epitope tag. When five myc epitopes were attached to vaccinia virus protein CrmA, its signal was multiplied 5.8 times in Western blot analysis, compared with that of one epitope-tagged CrmA.

Construction of multiple-epitope tag sequence by PCR for sensitive Western blot analysis