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2012 ; 2012
(2
): 242-5
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Single-molecule high-resolution colocalization of single probes
#MMPMID22301661
Churchman LS
; Spudich JA
Cold Spring Harb Protoc
2012[Feb]; 2012
(2
): 242-5
PMID22301661
show ga
Colocalization of fluorescent probes is commonly used in cell biology to discern
the proximity of two proteins in the cell. Considering that the resolution limit
of optical microscopy is on the order of 250 nm, there has not been a need for
high-resolution colocalization techniques. However, with the advent of higher
resolution techniques for cell biology and single-molecule biophysics,
colocalization must also improve. For diffraction-limited applications, a
geometric transformation (i.e., translation, scaling, and rotation) is typically
applied to one color channel to align it with the other; however, to achieve
high-resolution colocalization, this is not sufficient. Single-molecule
high-resolution colocalization (SHREC) of single probes uses the local weighted
mean transformation to achieve a colocalization resolution of at least 10 nm.
This protocol describes the acquisition of registration data and the analysis
required to obtain a high-resolution mapping between imaging channels. The total
internal reflection fluorescence microscope (TIRFM) system described is designed
to excite and image the fluorescent probes Cy3 and Cy5. Modifications may be
required depending on the requirements of the individual study.