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- W2019919943 abstract "A DNA/RNA non-specific alkaline nuclease (BmdsRNase) was isolated from the digestive juice of Bombyx mori. While originally reported to be produced by the midgut only, in this project it was found that the mRNA of this enzyme was also expressed in the epidermis, fat body, gut, thoracic muscles, Malpighian tubules, brain, and silk glands of 5th instar larvae, indicating additional functions to its reported role in nucleic acid digestion in the midgut.In order to study the functional properties of BmdsRNase, three pEA-BmdsRNase expression constructs were generated, characterized by presence or absence of a signal peptide and a propeptide, and used for expression in lepidopteran Hi5 tissue culture cells. Western blot indicated that these different forms of BmdsRNase protein were not secreted into the growth medium, while they were detected in the pellets and supernatants of Hi5 cell extracts. Nucleic acids cleavage experiments indicated that full-length BmdsRNase could digest dsRNA and that the processed form (absence of signal peptide and propeptide) of BmdsRNase could degrade both DNA and dsRNA in Hi5 cell culture. Using a reporter assay targeted by transfected homologous dsRNA, it was shown that the digestive property of the processed form could interfere with the RNAi response. Immunostaining of processed BmdsRNase protein showed asymmetric localization in the cellular cytoplasm and co-localization with Flag-tagged Dicer-2 was also observed.In conclusion, our in vitro studies indicated that intracellular protein isoforms of BmdsRNase can be functional and involved in the regulation of nucleic acid metabolism in the cytoplasm. In particular, because of its propensity to degrade dsRNA, the enzyme might be involved in the innate immune response against invading nucleic acids such as RNA viruses." @default.
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- W2019919943 date "1965-12-01" @default.
- W2019919943 modified "2023-10-11" @default.
- W2019919943 title "An endonuclease from silkworm — Purification and mode of action" @default.
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- W2019919943 doi "https://doi.org/10.1016/0006-291x(65)90522-x" @default.
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