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• W3210991554 abstract "piRNAs are essential for transposon repression and protecting the germline from deleterious mutations. piRNA biogenesis comprises a primary and secondary pathway, and involves PIWI clade argonaute proteins and ancillary factors. Secondary piRNA biogenesis is tightly coupled to transposon repression. It requires processing of the 3-prime end of pre-piRNA during an amplification loop by an as yet unidentified endonuclease. Here, using crystallography, and biochemical assays, we discover that the Drosophila Qin protein, which is a critical member of the core amplification complex, has endonuclease activity. Qin contains five extended Tudor domains, which had been proposed to recognize methylated ligands. Instead, we show that these domains act as RNA-specific nucleases. This supports a role for Qin in the 3-prime end processing of Ago3-bound pre-piRNAs. Extended Tudor domains are frequent in piRNA-processing proteins, suggesting that the uncovered nuclease activity of this protein fold may be key to understanding the piRNA biogenesis." @default.
• W3210991554 created "2021-11-08" @default.
• W3210991554 creator A5004448547 @default.
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• W3210991554 date "2021-10-25" @default.
• W3210991554 modified "2023-09-23" @default.
• W3210991554 title "EXTENDED TUDOR-DOMAINS of the piRNA BIOGENESIS PATHWAY HAVE RNA-SPECIFIC NUCLEASE ACTIVITY" @default.
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• W3210991554 doi "https://doi.org/10.1101/2021.10.25.465661" @default.
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