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Indexed by:Journal Papers

Date of Publication:2019-12-17

Journal:Angewandte Chemie (International ed. in English)

Included Journals:PubMed

ISSN No.:1521-3773

Key Words:cofactor mimics,enzymes,hypoxia,metal-organic capsules,supramolecular chemistry

Abstract:Identifying the location and expression levels of enzymes under hypoxic conditions in cancer cells is vital in early-stage cancer diagnosis and monitoring. By encapsulating a fluorescent substrate, L-NO2 , within the NADH mimic-containing metal-organic capsule Zn-MPB, we developed a cofactor-substrate-based supramolecular luminescent probe for ultrafast detection of hypoxia-related enzymes in solution in vitro and in vivo. The host-guest structure fuses the coenzyme and substrate into one supramolecular probe to avoid control by NADH, switching the catalytic process of nitroreductase from a double-substrate mechanism to a single-substrate one. This probe promotes enzyme efficiency by altering the substrate catalytic process and enhances the electron transfer efficiency through an intra-molecular pathway with increased activity. The enzyme content and fluorescence intensity showed a linear relationship and equilibrium was obtained in seconds, showing potential for early tumor diagnosis, biomimetic catalysis, and prodrug activation.© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.