Abstract
Crustacean hyperglycemic hormone (CHH) not only plays an important role in the modulation of hemolymph glucose level but also functions in other biological events including molting, reproduction and stress response. Of the six CHHs characterized in Marsupenaeus japonicus, an expression system for recombinant Pej-SGP-VII (rPej-SGP-VII-amide) has not yet been established. Here, we established a procedure using a Nus-tag for solubilization, thereby soluble and biologically active rPej-SGP-VII-amide could successfully be obtained by a simpler procedure than previous ones used for producing other recombinant Pej-SGPs (Pej-SGP-I, III and IV). It was found that rPej-SGP-VII-amide thus obtained had the correct arrangement of intramolecular disulfide bonds and helix-rich secondary structure. The established expression system for rPej-SGP-VII-amide may be applicable for the preparation of other recombinant CHHs.
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