Signal peptides leading secretory expression of foreign genes in insect expression system

Fusing nucleotde sequences of signal peptides of the arrowhead proeinase inhibitor of plant origin and gp67 of baculoirus origin with the arrowhead proteinase inhibitor (API) gene and colning them into insect baculovirus transfer vector pBacPAK8 respectively, then integrating each into insect virus expression vector Bm - BacPAK6, we harvested recombinant virus of CrBK - API4 and CrBK - gpAPI2. Inhibitor was high - level expressed. Exogenous expression products almost existed in supernatant fluid of extracellular region in Bm cells; expression in larvae showed that the signal peptides can lead foreign genes to express efficiently and 90Percent of the expression products can secret to extracellular region;in pupae, the situation was similar to sarae, but expressing products appeared to be heterogeneous, compared with larvae, there is a surplus inferior band with molecular weight about 1KD in pupae, From molecular weight of the expressing products by SDS - PAGE, we can infer that the two signal peptides were likely not cut in the expression procedure.