Transition state stabilization by a catalytic RNARupert, P.B., Massey, A.P., Sigurdsson, S.T., Ferre-D'Amare, A.R.
(2002) Science 298: 1421-1424
- PubMed: 12376595
- DOI: https://doi.org/10.1126/science.1076093
- Primary Citation of Related Structures:
1M5O, 1M5P, 1M5V
- PubMed Abstract:
The hairpin ribozyme catalyzes sequence-specific cleavage of RNA through transesterification of the scissile phosphate. Vanadate has previously been used as a transition state mimic of protein enzymes that catalyze the same reaction. Comparison of the 2.2 angstrom resolution structure of a vanadate-hairpin ribozyme complex with structures of precursor and product complexes reveals a rigid active site that makes more hydrogen bonds to the transition state than to the precursor or product. Because of the paucity of RNA functional groups capable of general acid-base or electrostatic catalysis, transition state stabilization is likely to be an important catalytic strategy for ribozymes.
Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109-1024, USA.