Abstract
The Tetrahymena ribozyme is a metalloenzyme that catalyzes cleavage of oligonucleotide substrates by phosphoryl transfer. Thiophilic metal ions such as Mn2+, Zn2+ or Cd2+ rescue the >103-fold inhibitory effect of sulfur substitution of the 3'-oxygen leaving group but do not effectively rescue the effect of sulfur substitution of the nonbridging pro-Sp phosphoryl oxygen. We now show that the latter effect can be fully rescued by Zn2+ or Cd2+ using a phosphorodithioate substrate, in which both the 3'-oxygen and the pro-Sp oxygen are simultaneously substituted with sulfur. These results provide the first functional evidence that metallophosphotransferases can mediate catalysis via metal ion coordination to both the leaving group and a nonbridging oxygen of the scissile phosphate.
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Acknowledgements
We thank D. Herschlag and S. Shan for critical evaluation of the manuscript and for helpful discussions throughout the course of this work. We also thank J. Curley, P. Gordon, M. Hamm, E. Sontheimer, and the referees for critical comments on the manuscript. J.A.P. is an assistant investigator of the Howard Hughes Medical Institute.
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Yoshida, A., Sun, S. & Piccirilli, J. A new metal ion interaction in the Tetrahymena ribozyme reaction revealed by double sulfur substitution. Nat Struct Mol Biol 6, 318–321 (1999). https://doi.org/10.1038/7551
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DOI: https://doi.org/10.1038/7551
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