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2015 ; 6
(10
): 3842-54
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Simultaneous FRAP, FLIM and FAIM for measurements of protein mobility and
interaction in living cells
#MMPMID26504635
Levitt JA
; Morton PE
; Fruhwirth GO
; Santis G
; Chung PH
; Parsons M
; Suhling K
Biomed Opt Express
2015[Oct]; 6
(10
): 3842-54
PMID26504635
show ga
We present a novel integrated multimodal fluorescence microscopy technique for
simultaneous fluorescence recovery after photobleaching (FRAP), fluorescence
lifetime imaging (FLIM) and fluorescence anisotropy imaging (FAIM). This approach
captures a series of polarization-resolved fluorescence lifetime images during a
FRAP recovery, maximizing the information available from a limited photon budget.
We have applied this method to analyse the behaviour of GFP-labelled
coxsackievirus and adenovirus receptor (CAR) in living human epithelial cells.
Our data reveal that CAR exists in oligomeric states throughout the cell, and
that these complexes occur in conjunction with high immobile fractions of the
receptor at cell-cell junctions. These findings shed light on previously unknown
molecular associations between CAR receptors in intact cells and demonstrate the
power of combined FRAP, FLIM and FAIM microscopy as a robust method to analyse
complex multi-component dynamics in living cells.