Crystal Structures of the Transcriptional Repressor RolR and Its Binding Mechanism with Resorcinol
Author Information
Author(s): Li De-Feng, Zhang Ning, Hou Yan-Jie, Huang Yan, Hu Yonglin, Zhang Ying, Liu Shuang-Jiang, Wang Da-Cheng
Primary Institution: National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, People's Republic of China
Hypothesis
How does the transcriptional repressor RolR recognize and bind to its effector resorcinol?
Conclusion
The study reveals a unique recognition mechanism between the transcriptional repressor RolR and the inducer resorcinol, which is distinct from other TetR family members.
Supporting Evidence
- The crystal structure of RolR complexed with resorcinol was determined at 2.5 Å resolution.
- Structural analysis revealed a unique hydrogen bond network mediated by water molecules for resorcinol binding.
- Mutagenesis studies confirmed the critical roles of specific residues in the binding affinity of RolR to resorcinol.
- RolR represents a novel subfamily of TetR proteins involved in aromatic degradation.
Takeaway
RolR is a protein that helps bacteria break down a chemical called resorcinol, and it does this in a special way that is different from other similar proteins.
Methodology
The crystal structures of RolR were determined using X-ray crystallography, analyzing both the ligand-bound and free forms.
Limitations
The study primarily focuses on the structural analysis and does not explore the functional implications of the findings in vivo.
Digital Object Identifier (DOI)
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