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Related Experiment Video

Updated: Jun 2, 2025

Identification of Small Molecule-binding Proteins in a Native Cellular Environment by Live-cell Photoaffinity Labeling
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Defining proteoform-specific interactions for drug targeting in a native cell signalling environment.

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|January 13, 2025
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Summary

This study reveals new methods to analyze protein modifications in native membranes, uncovering details about rhodopsin proteoforms and off-target drug interactions with retinal proteins like PDE6.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Pharmacology

Background:

  • Understanding membrane protein-ligand interactions is crucial for drug discovery.
  • Existing cell-based assays often overlook protein modifications.
  • Native lipid bilayer environments are key to protein function.

Purpose of the Study:

  • To develop a method for analyzing proteoforms and their interactions in native membrane environments.
  • To investigate rhodopsin proteoforms and their modifications.
  • To characterize off-target drug binding to retinal proteins.

Main Methods:

  • Infrared irradiation and mass spectrometry for releasing membrane proteins.
  • Infrared multiphoton dissociation for proteoform sequencing.
  • Characterization of off-target drug binding to phosphodiesterase 6 (PDE6).

Main Results:

  • Successfully released and sequenced individual retina proteoforms, including rhodopsin.
  • Identified distinct rhodopsin proteoforms, localized palmitoylations, and a Gβγ proteoform.
  • Determined differential off-target binding of vardenafil and sildenafil to PDE6, with a preference for lipidated G protein proteoforms.

Conclusions:

  • The study presents a novel approach for probing proteoform-ligand interactions in native membrane settings.
  • Findings provide insights into rhodopsin heterogeneity and G protein lipid modifications.
  • Characterization of drug off-target effects on retinal proteins offers valuable information for drug safety.