Subat, Michael and Borovik, Andrew S. and Koenig, Burkhard (2004) Synthetic creatinine receptor: Imprinting of a Lewis acidic zinc(II)cyclen binding site to shape its molecular recognition selectivity. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 126 (10). pp. 3185-3190. ISSN 0002-7863, 1520-5126
Full text not available from this repository. (Request a copy)Abstract
Molecularly imprinted polymers (MIPS) from polymerizable Lewis acidic zinc(II)cyclen complexes and ethylene glycol dimethyl acrylate have been prepared. For the imprinting process the template molecule creatinine is reversibly coordinated to the zinc atom. The high strength of this interaction allows analyte binding to the MIP from aqueous solution with high affinity. Its pH dependence is used for controlled guest release with nearly quantitative analyte recovery rate. The binding capacity and selectivity profile of the MIP remains constant through several pH controlled binding and release cycles. MIPS missing a suitable metal binding site showed no significant affinity for thymine or creatinine. Flavin adsorbs nonspecifically to all polymers. The imprinting process reverses the binding selectivity of zinc(II)cyclen for creatinine and thymine from 1:34 in homogeneous solution to 3.51 in the MIP. Scatchard plot analysis of creatinine binding isotherms reveals uniform binding of the imprint, with fits indicating a one-site model; however, similar analysis for thymine indicate high and low affinity sites. This corresponds to unrestricted coordination sites freely accessible for thymine, e.g., at the polymer surface, and misshaped imprinted sites, which still can accommodate thymine. More than 50% of all binding sites exclusively bind creatinine and are not accessible to thymine. The binding properties of a copolymer of polymerizable zinc(II)cyclen and ethylene glycol dimethyl acrylate missing the creatinine template, which match the binding selectivity of the complex in solution, confirm that the origin of altered selectivities is the imprinting process. With binding ability at physiological pH, the MIPS are applicable for tasks in medicinal diagnostics or biotechnology. Imprinted zinc(II)cyclen complexes provide, like a metalloenzyme binding motif, high binding affinity by reversible coordination while the surrounding macromolecule determines binding selectivity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL COMPLEXES; AFFINITY-CHROMATOGRAPHY; CARBONIC-ANHYDRASE; AQUEOUS-SOLUTION; POLYMERS; CATALYSIS; ANTIBODIES; ADSORPTION; PEPTIDES; MONOMER; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Burkhard König |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Jul 2021 10:13 |
| Last Modified: | 21 Jul 2021 10:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37870 |
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