Abstract
AbstractAn increasingly common strategy for expressing proteins and large peptides in prokaryotic systems is to express the protein of interest connected to a “tag” that provides the basis for rapid high‐affinity purification. This unit describes the expression and purification of fusion proteins containing the 26‐kDa glutathione‐S‐transferase protein as well as methods for cleaving the affinity tag and repurifying the target protein. Advantages of this popular fusion protein system include high protein yields, high‐affinity one‐step protein purification of the fusion protein, existence of several alternative protease cleavage sites for removing the affinity tag when required, and ease of removal of the cleaved affinity tag.
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