BLM helicase protein negatively regulates stress granule formation through unwinding RNA G-quadruplex structures
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Bloom's syndrome (BLM) protein is a known nuclear helicase that is able to unwind DNA secondary structures such as G-quadruplexes (G4s). However, its role in the regulation of cytoplasmic processes that involve RNA G-quadruplexes (rG4s) has not been previously studied. Here, we demonstrate that BLM is recruited to stress granules (SGs), which are cytoplasmic biomolecular condensates composed of RNAs and RNA-binding proteins. BLM is enriched in SGs upon different stress conditions and in an rG4-dependent manner. Also, we show that BLM unwinds rG4s and acts as a negative regulator of SG formation. Altogether, our data expand the cellular activity of BLM and shed light on the function that helicases play in the dynamics of biomolecular condensates.
Original language | English |
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Journal | Nucleic Acids Research |
Volume | 51 |
Issue number | 17 |
Pages (from-to) | 9369-9384 |
Number of pages | 16 |
ISSN | 0305-1048 |
DOIs | |
Publication status | Published - 2023 |
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