Abstract
The Ubiquitin (Ub)-like molecules is essential for animal development and the physiopathology of multiple tissues in the vertebrate. Ubiquitin-fold modifier 1 (UFM1) is one of the newly-identified UBL, which is covalently attached to its substrates through the orchestrated action of a dedicated enzymatic cascade. Bombyx mori nuclear polyhedrosis virus (BmNPV) is one of the main pathogens in sericulture, causing serious economic losses every year. However, there are no studies on UFMylation and the effect of UFMylation on BmNPV replication in silkworm. In this study, we identified BmUFM1 in the B. mori genome. Spatio-Temporal expression profiles showed that BmUFM1 expression was highly in hemocytes and response to various pathogenic stimuli. Furthermore, BmUFM1 is involved in the regulation of ER stress induced Unfolded Protein Response (UPR) and knockdown of BmUFM1 inhibited BmNPV replication. Overall, these results suggest that BmUFM1 plays an important role in facilitating BmNPV proliferation in silkworm. Our findings advance the understanding of UFM1's conjugation machinery, and also provides a potentially molecular target for BmNPV prevention and silkworm breeding.
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