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X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
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X-Ray Crystallography to Study Conformational Changes in a TPP Riboswitch.
Ashok Nuthanakanti1, Ascensión Ariza-Mateos1, Alexander Serganov2
1Department of Biochemistry and Molecular Pharmacology, New York University Grossman School of Medicine, New York, NY, USA.
Methods in Molecular Biology (Clifton, N.J.)
|October 13, 2022
Summary
Riboswitches regulate gene expression through ligand-induced conformational changes. X-ray crystallography reveals local RNA alterations crucial for metabolite binding and gene control, aiding designer riboswitch development.
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- Riboswitches are regulatory RNA elements that control gene expression.
- They bind specific metabolites via conserved sensing domains.
- Ligand binding induces conformational changes, altering gene expression via expression platforms.
Purpose of the Study:
- To investigate the role of conformational rearrangements in riboswitch function.
- To understand RNA-ligand interactions stabilizing riboswitch structures.
- To explore the potential for designing novel riboswitch-ligand systems.
Main Methods:
- Preparation of thiamine pyrophosphate riboswitch RNAs.
- Crystallization of riboswitch-ligand complexes.
- X-ray crystallography to determine RNA structures.
Main Results:
- Obtained crystal structures of riboswitch-ligand complexes.
- Identified local conformational changes in RNA upon ligand binding.
- Demonstrated RNA's ability to discriminate between cognate and noncognate ligands.
Conclusions:
- X-ray crystallography is vital for understanding RNA dynamics and ligand interactions in riboswitches.
- Local structural changes are key to specific metabolite recognition.
- Insights can inform the development of engineered riboswitch systems.
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