Abstract
The hepatitis delta virus (HDV) ribozyme, a small self-cleaving RNA originally identified in the human pathogen HDV, has been found to be broadly dispersed throughout life. In this article, we describe an integrated approach to understand the catalytic mechanism of this ribozyme that combines kinetics, crystallography, Raman spectroscopy, and calculations. Kinetics studies provide rate and binding parameters for protons and metal ions, and allow for design of properly folded and catalytically relevant RNAs for crystallography. Raman studies on these crystals provide direct evidence that the nucleobase of C75 has a shifted pK a. Moreover, Raman crystallography and solution kinetics demonstrate that proton binding to the N3 of C75 couples anticooperatively with binding of a Mg2+ ion, suggesting that the two species are close in space. Extensive structural studies on this ribozyme suggest that the cleavage reaction proceeds through a combination of Lewis acid catalysis by a catalytic Mg2+ ion and general acid catalysis by the nucleobase of C75. Molecular dynamics and electrostatics calculations support the above mechanism and reveal an intensely electronegative pocket that plays key roles in positioning the catalytic metal ion and C75 for catalysis. Integrating the results of kinetics, X-ray crystallography, Raman crystallography, and molecular dynamics suggests that there is a second Mg2+ ion in the active site that is bound diffusely and may play a structural role. In sum, these four disparate approaches provide for a robust kinetic mechanism for the HDV ribozyme that lays groundwork for future studies into its detailed mechanism of dynamics and cleavage.
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Acknowledgments
We would like to acknowledge Peter Breen, Trevor Brown, Andrea Cerrone-Szakal, Durga Chadalavada, Elaine Chase, J. Chen, Jui-Hui Chen, Yuanyuan Chen, Eric Christian, Abir Ganguly, Bo Gong, Shu-ichi Nakano, Pallavi Thaplyal, Narayanan Veeraraghavan, and Rieko Yajima for their contributions to this project. These studies were supported by GM095923 (to BLG and PCB), GM81420 (to PRC), and GM56207 (to SHS).
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Golden, B.L., Hammes-Schiffer, S., Carey, P.R., Bevilacqua, P.C. (2013). An Integrated Picture of HDV Ribozyme Catalysis. In: Russell, R. (eds) Biophysics of RNA Folding. Biophysics for the Life Sciences, vol 3. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4954-6_8
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