Abstract
Ribonucleoprotein particles are central to numerous cellular pathways, but their study in vitro is often complicated by heterogeneity and aggregation. We describe a new technique to characterize these complexes trapped as homogeneous species in a nondenaturing gel. Using this technique, in conjunction with phosphorothioate footprinting analysis, we identify the protein-binding site and RNA folding states of ribonuclease P (RNase P), an RNA-based enzyme that, in vivo, requires a protein cofactor to catalyze the 5′ maturation of precursor transfer RNA (pre-tRNA). Our results show that the protein binds to a patch of conserved RNA structure adjacent to the active site and influences the conformation of the RNA near the tRNA-binding site. The data are consistent with a role of the protein in substrate recognition and support a new model of the holoenzyme that is based on a recently solved crystal structure of RNase P RNA.
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Acknowledgements
We thank A. Krivenko for cloning and initial characterization of the catalytic-domain constructs. We thank R. Batey for helpful comments regarding this work. The research was supported by The US National Institutes of Health (grant GM-34527 to N.R.P. and Molecular Biophysics Training Grant T32 GM-65103 to A.H.B.) through the University of Colorado at Boulder.
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Supplementary information
Supplementary Table 1
Phosphorothioate-I2 footprint of RNase P RNAs in the presence of RNase P proteins. (PDF 25 kb)
Supplementary Table 2
Difference in phosphorothioate-I2 cleavage of residues in the I and N folding states of RNase P RNA. (PDF 40 kb)
Supplementary Video 1
Full rotational view of the ternary complex model. (MOV 1780 kb)
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Buck, A., Kazantsev, A., Dalby, A. et al. Structural perspective on the activation of RNase P RNA by protein. Nat Struct Mol Biol 12, 958–964 (2005). https://doi.org/10.1038/nsmb1004
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DOI: https://doi.org/10.1038/nsmb1004
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