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Europium Cryptate Labeled Deoxyuridine-Triphosphate Analog: Synthesis and Enzymatic Incorporation

Abstract The synthesis of an europium tris-bipyridine cryptate labeled 2′-deoxyuridine-5′-triphosphate analog (K-11-dUTP) is described. This labeled triphosphate was incorporated into DNA through enzymatic reactions with terminal transferase and DNA polymerases. The enzymatic reactions were monitored by TRACE (Time Resolved Amplification of Cryptate Emission), a homogeneous method using Fluorescence Resonance Energy Transfer (FRET) from an europium cryptate as donor to a modified allophycocyanine as acceptor.