Dynamics of backbone conformational heterogeneity in Bacillus subtilis ribonuclease P protein.
Journal Article (Journal Article)
Interconversion of protein conformations is imperative to function, as evidenced by conformational changes associated with enzyme catalytic cycles, ligand binding and post-translational modifications. In this study, we used 15N NMR relaxation experiments to probe the fast (i.e., ps-ns) and slow (i.e., micros-ms) conformational dynamics of Bacillus subtilis ribonuclease P protein (P protein) in its folded state, bound to two sulfate anions. Using the Lipari-Szabo mapping method [Andrec, M., Montelione, G. T., and Levy, R. M. (2000) J. Biomol. NMR 18, 83-100] to interpret the data, we find evidence for P protein dynamics on the mus-ms time scale in the ensemble. The residues that exhibit these slow internal motions are found in regions that have been previously identified as part of the P protein-P RNA interface. These results suggest that structural flexibility within the P protein ensemble may be important for proper RNase P holoenzyme assembly and/or catalysis.
- Henkels, CH; Chang, Y-C; Chamberlin, SI; Oas, TG
- December 25, 2007
Volume / Issue
- 46 / 51
Start / End Page
- 15062 - 15075
International Standard Serial Number (ISSN)
Digital Object Identifier (DOI)
- United States