Simultaneous readout of multiple FRET pairs using photochromism

Thijs Roebroek, Wim Vandenberg, François Sipieter, Siewert Hugelier, Christophe Stove, Jin Zhang and Peter Dedecker ()
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Thijs Roebroek: KU Leuven
Wim Vandenberg: KU Leuven
François Sipieter: Centre National de la Recherche Scientifique, Institut Jacques Monod, Université de Paris
Siewert Hugelier: KU Leuven
Christophe Stove: Ghent University
Jin Zhang: University of California at San Diego
Peter Dedecker: KU Leuven

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract Förster resonant energy transfer (FRET) is a powerful mechanism to probe associations in situ. Simultaneously performing more than one FRET measurement can be challenging due to the spectral bandwidth required for the donor and acceptor fluorophores. We present an approach to distinguish overlapping FRET pairs based on the photochromism of the donor fluorophores, even if the involved fluorophores display essentially identical absorption and emission spectra. We develop the theory underlying this method and validate our approach using numerical simulations. To apply our system, we develop rsAKARev, a photochromic biosensor for cAMP-dependent protein kinase (PKA), and combine it with the spectrally-identical biosensor EKARev, a reporter for extracellular signal-regulated kinase (ERK) activity, to deliver simultaneous readout of both activities in the same cell. We further perform multiplexed PKA, ERK, and calcium measurements by including a third, spectrally-shifted biosensor. Our work demonstrates that exploiting donor photochromism in FRET can be a powerful approach to simultaneously read out multiple associations within living cells.

Date: 2021
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DOI: 10.1038/s41467-021-22043-0

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