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2016 ; 6
(ä): 28186
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Screening for protein-protein interactions using Förster resonance energy
transfer (FRET) and fluorescence lifetime imaging microscopy (FLIM)
#MMPMID27339025
Margineanu A
; Chan JJ
; Kelly DJ
; Warren SC
; Flatters D
; Kumar S
; Katan M
; Dunsby CW
; French PM
Sci Rep
2016[Jun]; 6
(ä): 28186
PMID27339025
show ga
We present a high content multiwell plate cell-based assay approach to quantify
protein interactions directly in cells using Förster resonance energy transfer
(FRET) read out by automated fluorescence lifetime imaging (FLIM). Automated FLIM
is implemented using wide-field time-gated detection, typically requiring only 10
s per field of view (FOV). Averaging over biological, thermal and shot noise with
100's to 1000's of FOV enables unbiased quantitative analysis with high
statistical power. Plotting average donor lifetime vs. acceptor/donor intensity
ratio clearly identifies protein interactions and fitting to double exponential
donor decay models provides estimates of interacting population fractions that,
with calibrated donor and acceptor fluorescence intensities, can yield
dissociation constants. We demonstrate the application to identify binding
partners of MST1 kinase and estimate interaction strength among the members of
the RASSF protein family, which have important roles in apoptosis via the Hippo
signalling pathway. KD values broadly agree with published biochemical
measurements.
|Animals
[MESH]
|COS Cells
[MESH]
|Chlorocebus aethiops
[MESH]
|Fluorescence Resonance Energy Transfer/*methods
[MESH]
|Green Fluorescent Proteins/metabolism
[MESH]
|Humans
[MESH]
|Intracellular Signaling Peptides and Proteins
[MESH]