Nucleic Acids Research, 1989, Vol. 17, No. 13 5361-5376
© 1989
MOLECULAR BIOLOGY |
Scission of RNA by the chemical nuclease of 1,10-phenanthroline-eopper ion: preference for single-stranded loops
1Departments of Microbiology and Biological Chemistry, Molecular Biology Institute, University of California Los Angeles, CA 90024, USA
*To whom correspondence should be addressed
Received October 17, 1988. Revised June 5, 1989. Accepted June 5, 1989.
The scission of RNA by the chemical nuclease activity of 1,10-phenanthroline-copper (OP-Cu) has been studied using a lac mRNA fragment and tRNAPhe as substrates. Since the chemical mechanism of scission involves oxidative attack on the ribose, scission is observed at all nucleotides including dihydrouridine and Y-bases. Specificity for single-stranded loop regions is apparent from the similarity of the reactivity of OP-Cu to the single-strand specific reagents dimethyl sulfate and diethyl pyrocarbonate using the fragment of lac mRNA as a substrate. Similar preference is observed in the reaction with tRNA although scission in the helical acceptor stem is also observed.
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