Profiling Proteins Involved in Peroxynitrite Homeostasis Using ROS/RNS Conditional Proteomics

Area of Science:

• Biochemistry
• Cell Biology
• Proteomics

Background:

• Peroxynitrite (ONOO⁻) is crucial in oxidative stress and redox signaling.
• Existing methods for ONOO⁻ detection lack specificity and sensitivity.
• High-throughput profiling of ONOO⁻-associated proteins is challenging.

Purpose of the Study:

• To develop a novel conditional proteomics approach for investigating ONOO⁻ homeostasis.
• To identify protein neighbors of ONOO⁻ within cells.
• To discover new roles for proteins in ONOO⁻ biology.

Main Methods:

• Development of Peroxynitrite-responsive protein Labeling reagents (Porp-L).
• Utilized 2,6-dichlorophenol as an ONOO⁻-activatable moiety for protein labeling.
• Applied Porp-L based conditional proteomics in immune-stimulated macrophages.

Main Results:

• Identified proteins involved in ONOO⁻ generation and modification.
• Revealed the endoplasmic reticulum (ER) as a significant ONOO⁻ hot spot.
• Discovered a novel role for Ero1a in ONOO⁻ formation.

Conclusions:

• Porp-L reagents offer a promising tool for studying ONOO⁻ biology.
• Conditional proteomics with Porp-L advances understanding of ONOO⁻ homeostasis.
• The study highlights the ER and Ero1a in ONOO⁻-related cellular processes.