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  • Title: Ultrafast fluorescence depolarisation in the yellow fluorescent protein due to its dimerisation.
    Author: Jung G, Ma Y, Prall BS, Fleming GR.
    Journal: Chemphyschem; 2005 Aug 12; 6(8):1628-32. PubMed ID: 16025560.
    Abstract:
    Transient absorption spectroscopy with sub-100 fs time resolution was performed to investigate the oligomerisation behaviour of eYFP in solution. A single time constant tau(AD)=2.2+/-0.15 ps is sufficient to describe the time-resolved anisotropy decay up to at least 200 ps. The close contact of two protein barrels is deduced as the exclusive aggregation state in solution. From the final anisotropy r(infinity)=0.28+/-0.02, the underlying quaternary structure can be traced back to the somewhat distorted structure of the dimers of wt-GFP. The use of autofluorescent proteins as rulers in Förster resonance energy transfer (FRET) measurements may demand polarisation-sensitive detection of the fluorescence with high time resolution.
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