Related Experiment Videos
Crystal structure of valinomycin-monohydrate cage complexes crystallized from dioxane
D A Langs1, R H Blessing, W L Duax
1Medical Foundation of Buffalo, Inc., NY.
International Journal of Peptide and Protein Research
|April 1, 1992
Summary
Valinomycin, a cyclic ionophore, was crystallized with water molecules inside its ion-binding cavity. These water molecules influence the ionophore's conformation, affecting metal binding site geometry.
Area of Science:
- Structural Biology
- Biochemistry
- Crystallography
Background:
- Valinomycin is a cyclic depsipeptide antibiotic known for its selective binding of potassium ions.
- Understanding the structural basis of ionophore activity is crucial for developing new therapeutic agents.
Purpose of the Study:
- To elucidate the crystal structure of valinomycin monohydrate complex.
- To investigate the role of water molecules in the ion-binding cavity of valinomycin.
Main Methods:
- Single crystal X-ray diffraction analysis.
- Crystallization from aqueous dioxane solvent.
Main Results:
- Valinomycin crystallized as a monohydrate complex with water molecules in the ion-binding cavity.
- The crystal structure revealed two non-equivalent valinomycin-water complexes.
- Water molecules induced distinct conformational changes in the ionophore, altering the metal binding site geometry.
Conclusions:
- Water molecules play a significant role in modulating the conformation of valinomycin.
- The observed conformational variations are attributed to different hydrogen bonding and coordination interactions involving water.
- These findings provide insights into the mechanism of ion selectivity and transport by valinomycin.