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Nucleic Acids Research, Vol 27, Issue 2 479-484, Copyright © 1999 by Oxford University Press

ARTICLES

A re-investigation of the thio effect at the hammerhead cleavage site

EC Scott and OC Uhlenbeck
Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0215, USA.

The effect of introducing a phosphorothioate at the hammerhead cleavage site was investigated using a kinetically well-characterized hammerhead. In buffers containing Mg ion, the RP-phosphorothioate isomer cleaved 2000- to 80 000-fold slower than the SPisomer or the unmodified RNA substrate. Addition of low concentrations of several thiophilic metal ions, especially Cd2+, to these reactions is sufficient to fully restore the cleavage rate of the RPsubstrate without affecting cleavage rate of the all-oxygen or SPsubstrate. Thus, a model proposing coordination of a divalent metal ion to the pro-R oxygen at the hammerhead cleavage site appears justified.
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