ArticleMethods in enzymology2024
Expression, purification, and biochemical analysis of the RNA-DNA hybrid helicase Sen1/SETX from Chaetomium thermophilum.
Article in Methods in enzymology, 2024. 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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Abstract
Yeast Sen1 and its vertebrate ortholog Senataxin (also known as SETX) are RNA-DNA resolving helicases. Sen1 and SETX are implicated in multiple critical nuclear functions not limited to but including DNA replication and repair, RNA processing, and transcription. These> 200 kDa helicases have a two-domain architecture with an N-terminal regulatory helical repeat array linked to an SF1b helicase motor core via a variable sized central linker of low complexity sequence. Given the size of these proteins, production of milligram quantities of protein that is suitable for biochemical, biophysical, and protein structural analysis has been challenging. To overcome these limitations, we developed a robust selectable high-yield YFP-fusion protein expression method for Sen1 production in mammalian cells, followed by purification on a high-affinity YFP-binding camelid nanobody support. Herein, we detail methods and protocols for the expression and purification of recombinant Sen1 from the thermophilic fungus Chaetomium thermophilum, and the quantitative characterization of its RNA-DNA duplex resolution activity.
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