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  • Title: Developing a peptide-based near-infrared molecular probe for protease sensing.
    Author: Pham W, Choi Y, Weissleder R, Tung CH.
    Journal: Bioconjug Chem; 2004; 15(6):1403-7. PubMed ID: 15546208.
    Abstract:
    Recently near-infrared (NIR) molecular probes have become important reporter molecules for a number of types of in vivo biomedical imaging. A peptide-based NIR fluorescence probe consisting of a NIR fluorescence emitter (Cy5.5), a NIR fluorescence absorber (NIRQ820), and a protease selective peptide sequence was designed to sense protease activity. Using a MMP-7 model, we showed that NIRQ820 efficiently absorbs the emission energy of Cy5.5 resulting in a low initial signal. Upon reacting with its target, MMP-7, the fluorescence signal of the designed probe was increased by 7-fold with a K(cat)/K(m) of 100 000 M(-)(1) s(-)(1). The described synthetic strategy should have wide application for other NIR probe preparations.
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