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2008:
Debler Erik W; Kaufmann Gunnar F; Meijler Michael M; Heine Andreas; Mee Jenny M; Pljevaljcic Goran; Di Bilio Angel J; Schultz Peter G; Millar David P; Janda Kim D; Wilson Ian A; Gray Harry B; Lerner Richard A
Deeply inverted electron-hole recombination in a luminescent antibody-stilbene complex.
Science (New York, N.Y.) 2008;
319(
5867):.
The blue-emissive antibody EP2-19G2 that has been elicited against trans-stilbene has unprecedented ability to produce bright luminescence and has been used as a biosensor in various applications. We show that the prolonged luminescence is not stilbene fluorescence. Instead, the emissive species is a charge-transfer excited complex of an anionic stilbene and a cationic, parallel pi-stacked tryptophan. Upon charge recombination, this complex generates exceptionally bright blue light. Complex formation is enabled by a deeply penetrating ligand-binding pocket, which in turn results from a noncanonical interface between the two variable domains of the antibody.
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