Methodologies for the characterization, identification and quantification of S-nitrosylated proteins

Area of Science:

• Biochemistry
• Proteomics
• Molecular Biology

Background:

• Protein S-nitrosylation, a key nitric oxide (NO) signaling pathway, is implicated in various diseases when aberrant.
• Understanding S-nitrosylation is critical for deciphering cellular signaling and disease mechanisms.

Purpose of the Study:

• To review methodologies for characterizing, identifying, and quantifying S-nitrosylated proteins (SNO-proteins).
• To focus on techniques applicable to structural characterization, absolute quantification, and proteomic analysis of SNO-proteins and S-nitrosylation sites (SNO-sites).

Main Methods:

• Review of techniques for structural characterization and absolute quantification of isolated SNO-proteins.
• Discussion of methods for identification and relative quantification of SNO-proteins in complex biological mixtures.
• Emphasis on mass spectrometry-based approaches for identifying and quantifying SNO-sites.

Main Results:

• X-ray crystallography is increasingly used to study SNO-protein structure, Cys thiol reactivity, and functional consequences.
• Proteomic methods have significantly advanced the identification and quantification of SNO-proteins and SNO-sites.
• These advancements enable deeper study of protein S-nitrosylation in complex biological systems.

Conclusions:

• Accurate identification and quantification of SNO-proteins are essential for progress in the field.
• Understanding the capabilities and limitations of modern analytical techniques is vital for researchers.
• This review provides critical insights into analytical techniques for SNO-protein analysis, supporting research on the regulation of cellular processes by S-nitrosylation.