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Fluorescent Probes to Characterise FK506‐Binding Proteins

Talented all‐rounders: Fluorescence polarisation assays were developed for members of the FK506‐binding protein family by using fluorescent rapamycin analogues (demonstrated in the figure). These tracers retain medium to high affinity to all tested proteins (FKBP12, ‐12.6, ‐13, ‐25, ‐51, ‐52). They can be used for active‐site titrations, competition assays with unlabelled ligands and enable a robust, miniaturized assay adequate for high‐throughput screening.