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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Overexpression and purification of Dicer and accessory proteins for biochemical and structural studies.
Methods : a Companion to Methods in Enzymology 2017 August 16
The Dicer family of ribonucleases plays a key role in small RNA-based regulatory pathways by generating short dsRNA fragments that modulate expression of endogenous genes, or protect the host from invasive nucleic acids. Beginning with its initial discovery, biochemical characterization of Dicer has provided insight about its catalytic properties. However, a comprehensive understanding of how Dicer's domains contribute to substrate-specific recognition and catalysis is lacking. One reason for this void is the lack of high-resolution structural information for a metazoan Dicer in the apo- or substrate-bound state. Both biochemical and structural studies are facilitated by large amounts of highly purified, active protein, and Dicer enzymes have historically been recalcitrant to overexpression and purification. Here we describe optimized procedures for the large-scale expression of Dicer in baculovirus-infected insect cells. We then outline a three-step protocol for the purification of large amounts (3-4mg of Dicer per liter of insect cell culture) of highly purified and active Dicer protein, suitable for biochemical and structural studies. Our methods are general and are extended to enable overexpression, purification and biochemical characterization of accessory dsRNA binding proteins that interact with Dicer and modulate its catalytic activity.
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