ArticlebioRxiv : the preprint server for biology2026
Nanometer-scale RNA protein clusters (RPCs) Foster Helicase Activity of DEAD-box eIF4A.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
Funding
Abstract
DEAD-box RNA helicases are central regulators of RNA metabolism, employing ATP-dependent mechanisms to remodel RNA structure and RNA-protein interactions, yet how helicase catalysis is coordinated with multi-subunit interactions between RNA and protein remains unresolved. Translation initiation helicase, eukaryotic initiation factor 4A (eIF4A), which acts as an intrinsically non-processive enzyme, is essential for unwinding structured mRNAs, relies on cofactors to achieve physiological activity. Here we uncover an unexpected RNA-helicase state of eIF4A, demonstrating that eIF4A forms nanometer-scale RNA-protein clusters (RPCs) of ~2-5 MDa in presence of its physiological cofactors eIF4B and eIF4G, RNA and ATP under near-physiological concentrations. Using a single molecule approach, we directly resolve the formation of discrete clusters that recruit multiple copies of proteins with RNA upon ATP addition and show that RPC formation correlates with helicase activity
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