Protein Termini and Their Modifications Revealed by Positional Proteomics.

Area of Science:

• Biochemistry and Molecular Biology
• Proteomics
• Post-translational Modifications

Background:

• Protein N- and C-termini undergo numerous co- and post-translational modifications, increasing proteome complexity and regulatory mechanisms.
• Understanding these terminal modifications is crucial for a comprehensive view of protein function and regulation.

Purpose of the Study:

• To review N- and C-terminal modifications and the proteomics techniques used to study them.
• To highlight the role of terminomics in understanding proteolysis and protein regulation in biological systems.

Main Methods:

• Review of contemporary positional proteomics techniques for isolating and characterizing protein terminal peptides.
• Discussion of degradomics strategies, specifically N- and C-terminomics, as high-throughput methods.

Main Results:

• Terminomics studies have provided significant insights into the functional states of proteins, cells, tissues, and biological processes.
• These studies have identified numerous "missing proteins" not previously detected by traditional proteomics.

Conclusions:

• N- and C-terminomics are powerful tools for studying protein terminal modifications and proteolysis.
• These techniques are essential for advancing proteome research, including initiatives like the Human Proteome Project.