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• W4286541421 abstract "The highly conserved Superfamily 1 (SF1) and Superfamily 2 (SF2) nucleic acid-dependent ATPases, are ubiquitous motor proteins with central roles in DNA and RNA metabolism (Jankowsky & Fairman, 2007). These enzymes require RNA or DNA binding to stimulate ATPase activity, and the conformational changes that result from this coupled behavior are linked to a multitude of processes that range from nucleic acid unwinding to the flipping of macromolecular switches (Pyle, 2008, 2011). Knowledge about the relative affinity of nucleic acid ligands is crucial for deducing mechanism and understanding biological function of these enzymes. Because enzymatic ATPase activity is directly coupled to RNA binding in these proteins, one can utilize their ATPase activity as a simple reporter system for monitoring functional binding of RNA or DNA to an SF1 or SF2 enzyme. In this way, one can rapidly assess the relative impact of mutations in the protein or the nucleic acid and obtain parameters that are useful for setting up more quantitative direct binding assays. Here, we describe a routine method for employing NADH-coupled enzymatic ATPase activity to obtain kinetic parameters reflecting apparent ATP and RNA binding to an SF2 helicase. First, we provide a protocol for calibrating an NADH-couple ATPase assay using the well-characterized ATPase enzyme hexokinase, which a simple ATPase enzyme that is not coupled with nucleic acid binding. We then provide a protocol for obtaining kinetic parameters (KmATP, Vmax and KmRNA) for an RNA-coupled ATPase enzyme, using the double-stranded RNA binding protein RIG-I as a case-study. These approaches are designed to provide investigators with a simple, rapid method for monitoring apparent RNA association with SF2 or SF1 helicases." @default.
• W4286541421 created "2022-07-22" @default.
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• W4286541421 date "2022-01-01" @default.
• W4286541421 modified "2023-10-18" @default.
• W4286541421 title "Monitoring functional RNA binding of RNA-dependent ATPase enzymes such as SF2 helicases using RNA dependent ATPase assays: A RIG-I case study" @default.
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• W4286541421 doi "https://doi.org/10.1016/bs.mie.2022.03.064" @default.
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