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In Vitro Characterization of the Prokaryotic Counterparts of the Exosome Complex

Methods in Molecular Biology, ISSN: 1940-6029, Vol: 2062, Page: 47-61
2020
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Book Chapter Description

The same basic set of enzymatic activities exhibited by the eukaryotic RNA exosome are also found in prokaryotes. Bacteria have two predominant and distinct 3′→5′ exoribonuclease activities: one is characterized by processive hydrolysis, derived from RNase II and RNase R, and the other by processive phosphorolysis, derived from PNPase. In this chapter we describe methods for (1) the overexpression and purification of these three proteins; and (2) their in vitro biochemical and enzymatic characterization—including RNA binding. The labeling and preparation of a set of specific RNA substrates is also described.

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