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- W4324361412 abstract "Homologs of Autophagy-related (Atg) protein 4 are reported to cleave LC3 protein and facilitate autophagy occurrence differently in mammals, whereas their functions have not been investigated in insects. Three homologs, including BmAtg4a and its short form BmAtg4c as well as BmAtg4b, exist in Bombyx mori. Herein, the autophagic functions of BmAtg4a and BmAtg4b were investigated. qPCR detection found that BmAtg4a and BmAtg4b both peaked during larval-pupal metamorphosis when autophagy occurs robustly. Immunofluorescent staining showed that BmAtg4a was predominantly localized at the cytoplasm, while BmAtg4b had notable nuclear localization. Overexpression of BmAtg4a and BmAtg4b both slightly promoted basal autophagy but inhibited the autophagy induced by the infection of B. mori nucleopolyhedrovirus (BmNPV) and, thereby, its proliferation. In comparison, knockout of BmAtg4a or BmAtg4b significantly upregulated BmNPV-induced autophagy and its replication in BmN cells. Results of Co-immunoprecipitation associated with mass spectrum showed that the cytoskeleton protein B. mori actin A2 (BmACT2) and B. mori actin A1 (BmACT1) bound with BmAtg4a and BmAtg4b especially. Knockout of BmACT1 and BmACT2 inhibited BmAtg4b- and BmAtg4a-induced autophagy, respectively; moreover, knockout of BmACT1 reduced the ratio of cells with nuclear BmAtg4b. Of note, BmAtg4a and BmAtg4b had physical interaction, and they had an inhibitory effect on mutual autophagic function. In this work, we provide new insights into the autophagy machinery in insects as well as its function in the proliferation of BmNPV." @default.
- W4324361412 created "2023-03-16" @default.
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- W4324361412 date "2023-03-15" @default.
- W4324361412 modified "2023-10-03" @default.
- W4324361412 title "Cytoskeleton Protein BmACT1 Is Potential for the Autophagic Function and Nuclear Localization of BmAtg4b in Bombyx mori" @default.
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- W4324361412 doi "https://doi.org/10.3390/cells12060899" @default.
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