Design of Turn-On Near-Infrared Fluorescent Probes for Highly Sensitive and Selective Monitoring of Biopolymers.

Angewandte Chemie
Gerard T DucharmeEvgueni E Nesterov

Abstract

Simple, sensitive, and selective detection of specific biopolymers is critical in a broad range of biomedical and technological areas. We present a design of turn-on near-infrared (NIR) fluorescent probes with intrinsically high signal-to-background ratio. The fluorescent signal generation mechanism is based on the aggregation/de-aggregation of phthalocyanine chromophores controlled by selective binding of small-molecule "anchor" groups to a specific binding site of a target biopolymer. As a proof-of-concept, we demonstrate a design of a sensor for EGFR tyrosine kinase-an important target in cancer research. The universality of the fluorescent signal generation mechanism, as well as the dependence of the response selectivity on the choice of the small-molecule "anchor" group, make it possible to use this approach to design reliable turn-on NIR fluorescent sensors for detecting specific protein targets present in the low-nanomolar concentration range.

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