Add time:08/11/2019 Source:sciencedirect.com
Silkworm larva has a lot of advantages as a “biofactory” to produce recombinant protein. A recombinant baculovirus, carrying cDNA encoding the 165 amino-acid long isoform of human vascular endothelial growth factor (VEGF) was successfully constructed for the large-scale production of this protein using silkworms as an in vivo host. The fifth-instar silkworm larvae were inoculated with the recombinant virus. Time-course expression analysis indicated that the expression level was highest at around 80 h post-infection and the recombinant protein was found mainly in the haemolymph. Therefore, the hemolymph was collected from the infected larvae and the recombinant protein was purified by using Nickel affinity chromatography under native condition. The expression level was estimated to be as high as approximately 426 μg per larva. Furthermore, the recombinant protein was characterized and was found biologically active in inducing endothelial cell proliferation in vitro.
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