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Protein Dynamics in Living Cells

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Related Experiment Video

Updated: Jun 18, 2026

Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation

Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation

Published on: June 21, 2021

Detecting changes in the thiol redox state of proteins following a decrease in oxygen concentration using a dual

James K C Lui¹, Richard Lipscombe, Peter G Arthur

¹School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, Western Australia. j.lui@ecu.edu.au

Journal of Proteome Research

|November 10, 2009

Summary

This summary is machine-generated.

Standard cell culture oxygen levels can alter protein function. Researchers found that reducing oxygen exposure changed the thiol redox state of many proteins, suggesting a link between cell culture conditions and cellular behavior.

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Published on: June 28, 2024

Area of Science:

Cell Biology
Biochemistry
Oxidative Stress Research

Background:

Cells in culture are often exposed to hyperoxia (high oxygen), increasing reactive oxygen species and oxidative stress.
Oxidative stress may cause in vitro cells to differ from in vivo cells.
Protein thiol groups (-SH) on cysteine residues are susceptible to oxidation, potentially altering protein function.

Purpose of the Study:

To investigate if altered oxygen concentrations affect the thiol redox state of proteins.
To develop a method for assessing protein cysteine redox states.

Main Methods:

Developed a sensitive dual-labeling method using fluorescent tags to distinguish reduced and oxidized cysteine residues.
Analyzed protein thiol redox state changes in response to decreased oxygen concentration.

Main Results:

Identified 62 out of 411 protein spots with significantly more reduced cysteine residues after a 30-minute reduction in oxygen.
Demonstrated that changes in oxygen concentration directly impact protein thiol redox states.

Conclusions:

Elevated oxygen levels in typical cell culture can alter cellular behavior.
Changes in protein thiol redox state are a key mechanism through which hyperoxia affects cell function.
This highlights the importance of controlled oxygen environments in cell culture research.