Detection of an abasic site in RNA with stem-loop DNA beacons: application to an activity assay for Ricin Toxin A-Chain.


The catalytic ability of Ricin Toxin A-Chain (RTA) to create an abasic site in a 14-mer stem-tetraloop RNA is exploited for its detection. RTA catalyzes the hydrolysis of the N-glycosidic bond of a specific adenosine in the GAGA tetraloop of stem-loop RNA. Thus, a 14-mer stem-loop RNA substrate containing an intact "GAGA" sequence can be discriminated from… (More)
DOI: 10.1016/j.jprot.2007.12.010


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