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Allosteric behavior of artificial compounds.
1Department of Synthetic Chemistry, Faculty of Engineering, Kyoto University, Japan.
Biomaterials, Artificial Cells, and Artificial Organs
|January 1, 1988
Summary
Artificial allosteric molecules, created by linking metal porphyrins, exhibit cooperative binding. This cooperativity in small molecule binding, like CO or O2, is driven by chemical strain release upon initial molecule attachment.
Area of Science:
- Supramolecular Chemistry
- Coordination Chemistry
- Chemical Biology
Background:
- Artificial allosteric molecules are synthesized by covalently linking two independent metal porphyrin units.
- These dimeric structures mimic monomeric metal porphyrins in most aspects, excluding adsorption-dissociation behaviors.
Purpose of the Study:
- To investigate the cooperative binding and dissociation of small molecules (e.g., CO, O2, bases) to the metal centers of dimeric porphyrins.
- To elucidate the role of chemical strain in facilitating cooperative binding events.
Main Methods:
- Covalent synthesis of dimeric metal porphyrin molecules.
- Characterization of adsorption and dissociation properties.
- Analysis of cooperative binding phenomena.
Main Results:
- Dimeric porphyrins display unique adsorption-dissociation characteristics compared to monomers.
- Strong cooperativity is observed in the binding of small molecules to the metal centers.
- Initial small molecule binding induces a coordinating change, releasing pre-existing chemical strain within the dimeric structure.
Conclusions:
- The study highlights the potential of engineered dimeric porphyrins as artificial allosteric systems.
- Cooperative binding is a key feature, modulated by the release of chemical strain.
- These findings offer insights into designing molecules with tunable binding affinities for small molecules.