Dynamics of backbone conformational heterogeneity in Bacillus subtilis ribonuclease P protein.
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.
Duke Scholars
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Ribonuclease P
- Protein Structure, Tertiary
- Models, Molecular
- Crystallography, X-Ray
- Biochemistry & Molecular Biology
- Bacillus subtilis
- 3404 Medicinal and biomolecular chemistry
- 3205 Medical biochemistry and metabolomics
- 3101 Biochemistry and cell biology
- 1101 Medical Biochemistry and Metabolomics
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Ribonuclease P
- Protein Structure, Tertiary
- Models, Molecular
- Crystallography, X-Ray
- Biochemistry & Molecular Biology
- Bacillus subtilis
- 3404 Medicinal and biomolecular chemistry
- 3205 Medical biochemistry and metabolomics
- 3101 Biochemistry and cell biology
- 1101 Medical Biochemistry and Metabolomics