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• W2131752668 abstract "We report here the striking anisotropy of fluorescence exhibited by crystals of native green fluorescence protein (GFP). The crystals were generated by water dialysis of highly purified GFP obtained from the jellyfish Aequorea . We find that the fluorescence becomes six times brighter when the excitation, or emission, beam is polarized parallel (compared with perpendicular) to the crystal long axis. Thus, the major dipoles of the fluorophores must be oriented very nearly parallel to the crystal long axis. Observed in a polarizing microscope between parallel polars instead of either a polarizer or analyzer alone, the fluorescence polarization ratio rises to an unexpectedly high value of about 30:1, nearly the product of the fluorescence excitation and emission ratios, suggesting a sensitive method for measuring fluorophore orientations, even of a single fluorophore molecule. We have derived equations that accurately describe the relative fluorescence intensities of crystals oriented in various directions, with the polarizer and analyzer arranged in different configurations. The equations yield relative absorption and fluorescence coefficients for the four transition dipoles involved. Finally, we propose a model in which the elongated crystal is made of GFP molecules that are tilted 60° to align the fluorophores parallel to the crystal long axis. The unit layer in the model may well correspond to the arrangement of functional GFP molecules, to which resonant energy is efficiently transmitted from Ca 2+ -activated aequorin, in the jellyfish photophores." @default.
• W2131752668 created "2016-06-24" @default.
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• W2131752668 date "2002-04-02" @default.
• W2131752668 modified "2023-09-26" @default.
• W2131752668 title "Fluorescence polarization of green fluorescence protein" @default.
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• W2131752668 doi "https://doi.org/10.1073/pnas.062065199" @default.
• W2131752668 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/123638" @default.
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