A new luminescent biosensor for complicated glycoconjugates was engineered on the basis of a lanthanide-complexed sugar-binding protein (lectin) modified with a fluorophore. By using luminescence resonance energy transfer (LRET), ratiometric luminescent sensing can be carried out and successfully applied to a luminescent assay for an enzymatic trimming of a glycoprotein (see scheme).
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Koshi et al. (2005) studied this question.
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