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  A photochromic acceptor as a reversible light-driven switch in fluorescence resonance energy transfer (FRET)

Song, L., Jares-Erijman, E. A., & Jovin, T. M. (2002). A photochromic acceptor as a reversible light-driven switch in fluorescence resonance energy transfer (FRET). Journal of Photochemistry and Photobiology A-Chemistry, 150(1-3), 177-185. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TGY-45JPH4K-1-2R&_cdi=5267&_user=38661&_pii=S1010603002001296&_origin=search&_coverDate=07%2F26%2F2002&_sk=998499998&view=c&wchp=dGLbVzW-zSkWA&md5=06406779884bb46c3d9f69e78edb24da&ie=/sdarticle.pdf.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-F36B-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-E558-B
Genre: Journal Article

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 Creators:
Song, L.1, Author              
Jares-Erijman, E. A., Author
Jovin, T. M.2, Author
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1Department of Molecular Biology, MPI for biophysical chemistry, Max Planck Society, ou_578628              
2Max Planck Society, ou_persistent13              

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Free keywords: photochromism; spiropyran; merocyanine; fluorescence microscopy; pcFRET
 Abstract: A method has been developed for the quantitative determination of fluorescence resonance energy transfer (FRET) based on the modulation of donor fluorescence upon the reversible photoconversion of a photochromic acceptor. A model system was devised, consisting of Lucifer Yellow cadaverine (LYC, donor) conjugated to the photochromic molecule, 6-nitroBIPS (1',3- dihydro-1'-(2-carboxyethyl)-3,3-dimethyl-6-nitrospiro[2H-1- benzopyran-2,2'-(2H)-indoline]). Near-ultraviolet irradiation catalyzes the conversion of the colorless spiropyran (SP) to the colored merocyanine (MC) form of 6-nitroBIPS. Only the MC form absorbs at the emission wavelengths of the donor, thereby potentiating FRET, as demonstrated by quenching of the donor. Subsequent irradiation in the visible MC absorption band reverts 6-nitroBIPS to the SP form and FRET is inactivated. The acceptor exhibited high photostability under repeated cycles of alternating UV-Vis irradiation. In this model system, the intramolecular FRET efficiency was close to 100%. The observed maximal donor quenching of 34+/-3% was indicative of an equilibrium determined by the high quantum efficiency of forward conversion (SP --> MC) induced by near-UV irradiation and a low but finite quantum efficiency of the back reaction resulting from excitation of the MC form directly as well as indirectly (by FRET via the donor). A quantitative formalism for the photokinetic scheme was developed. Photochromic FRET (pcFRET) permits repeated, quantitative, and non-destructive FRET determinations for arbitrary relative concentrations of donor and acceptor and thus offers great potential for monitoring dynamic molecular interactions in living cells over extended observation times by fluorescence microscopy. (C) 2002 Elsevier Science B.V. All rights reserved.

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 Dates: 2002-07-26
 Publication Status: Published in print
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Title: Journal of Photochemistry and Photobiology A-Chemistry
Source Genre: Journal
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Pages: - Volume / Issue: 150 (1-3) Sequence Number: - Start / End Page: 177 - 185 Identifier: -