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Stratagenes FLAG Western Detection Kit can be used to monitor expression and purification processes. With this kit, recombinant fusion proteins that are tagged with the FLAG epitope at N-terminal, C-terminal and internal positions can be detected. As shown in figure 3, the FLAG epitope contained in the calmodulin-GST fusion protein can be detected before and after purification of the fusion protein.
figure 4
Stratagene previously introduced the pESP-1 and pESP-2 vectors (figure 4), which feature N-terminal tagging with GST for purification.2-4 In addition, the pESP-2 vector offers the option of cloning PCR products through ligation-independent cloning (LIC).12 When the LIC method is used, polypeptides without extraneously added amino acid residues can be obtained after removing the GST tag by enterokinase cleavage.3,4 Both the pESP-1 and pESP-2 vectors are available separately and as components of the ESP system and ESP LIC systems, respectively. The ESP system has been extensively tested for inducible expression of a variety of eukaryotic proteins, including human MEK kinases and rat c-Jun N-terminal kinase (JNK). In these tests, up to 12.5 mg/liter of recombinant proteins has been obtained (table 1).
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