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Domestication of silkworm has led to alterations in various gene expression patterns. For instance, many protease inhibitors were significantly downregulated in the domestic silkworm cocoon compared to its wild progenitor. Considering that SPI51 is the most abundant protease inhibitor in silkworm cocoons, herein, we compared the gene structures and sequences of SPI51 from B. mori (BmoSPI51) and B. mandarina (BmaSPI51). Comparing to the "RGGFR" active site in BmaSPI51, that of BmoPI51 is "KGSFP" and the C-terminal "YNTCECSCP" tail sequence is lost in the latter. To investigate the effect elicited by the active site and tail sequences on the function of SPI51, we expressed two mutated forms of BmoSPI51, namely, BmoSPI51 + tail and BmoSPI51M. BmoSPI51, BmoSPI51 + tail and BmoSPI51M were compared and found to have similar levels of inhibitory activity against trypsin. However, the BmoSPI51 + tail and BmoSPI51M proteins exhibited significantly stronger capacities to inhibit fungi growth, compared to BmoSPI51. We concluded that the specific amino acid sequence of the active site, as well as its the disulfide bond formed by C-terminal sequence in the BmaSPI51, represent the key factors responsible for its higher antifungal activity. This study provided new insights into the antifungal mechanisms elicited by protease inhibitors in the cocoons of silkworms.
30K proteins are a major group of nutrient storage proteins in the silkworm hemolymph. Previous studies have shown that 30K proteins are involved in the anti-fungal immunity; however, the molecular mechanism involved in this immunity remains unclear.
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