Abstract
We constructed a cold induced expression vector in Escherichia coli cells that consists of a histidine tag sequence for nickel chelate affinity purification, IgG-binding domain of protein A (ZZ-domain) and the multiple cloning sites. The role of ZZ-domain as a solubilizing partner at 15°C was demonstrated by expressing the imidazopyrazinone-type luciferases of Renilla, Oplophorus, Gaussia, and Vargula (Cypridina) as well as the calcium-binding photoproteins and firefly luciferase. The fused protein with ZZ-domain was expressed efficiently as a soluble form in the cytoplasm of E. coli cells at low temperature.
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