Fluorescence Resonance Energy Transfer (FRET) measurements

MK Misun Kwak
CH Chansik Hong
JM Jongyun Myeong
EP Eunice Yon June Park
JJ Ju-Hong Jeon
IS Insuk So
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Three FRET images (cube settings for CFP, YFP, and Raw FRET) were obtained from a pE-1 Main Unit to 3 FRET cubes (excitation, dichroic mirror, filter) via a fixed collimator. The excitation LED and the filter were sequentially rotated, and the rotation period for each filter cube was ~0.5 s. All of the images were obtained within 1.5 seconds. Each image was captured on a cooled 10 MHz (14 bit) CCD camera (ANDOR technology, USA) with 100 ms of exposure time with 2 × 2 binning (645 × 519 pixels). Using IX70, an Olympus microscope equipped with a 60× oil objective, the three-cube FRET efficiency was analyzed using MetaMorph 7.6 software (Molecular Devices, USA). For details of FRET ratio and FRET efficiency computation, please see the supplementary materials.

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