Dynamic Submicroscopic Signaling Zones Revealed by
Pair Correlation Tracking and Localization Microscopy
Changjiang You
Christian P. Richter
Sara Löchte
Stephan Wilmes
Jacob Piehler
10.1021/ac501127r.s002
https://acs.figshare.com/articles/media/Dynamic_Submicroscopic_Signaling_Zones_Revealed_by_Pair_Correlation_Tracking_and_Localization_Microscopy/2258926
Unraveling the spatiotemporal organization
of signaling complexes
within the context of plasma membrane nanodomains has remained a highly
challenging task. Here, we have applied super-resolution image correlation
based on tracking and localization microscopy (TALM) for probing transient
confinement as well as ligand binding and intracellular effector recruitment
of the type I interferon (IFN) receptor in the plasma membrane of
live cells. Ligand and receptor were labeled with monofunctional quantum
dots, thus allowing long-term tracking with very high spatial and
temporal resolution without an artificial receptor cross-linking at
the cell surface. Dual-color TALM was employed for visualizing protein–protein
interactions involved in IFN signaling at both sides of the plasma
membrane with high spatial and temporal resolution. By pair correlation
analyses based on time-lapse TALM images (pcTALM), complex assembly
within dynamic submicroscopic zones was identified. Strikingly, recruitment
of the IFN effector protein signal transducer and activator of transcription
2 (STAT2) into these dynamic signaling zones could be observed. The
results suggest that confined diffusion zones in the plasma membrane
are employed as transient platforms for the assembly of signaling
complexes.
2014-09-02 00:00:00
Pair Correlation Tracking
STAT
plasma membrane nanodomains
Dynamic Submicroscopic Signaling Zones Revealed
assembly
intracellular effector recruitment
image
receptor
plasma membrane
IFN effector protein signal transducer
TALM
pair correlation analyses
complex
monofunctional quantum dots