Protein sequence information by matrix-assisted laser desorption/ionization in-source decay mass spectrometry

Area of Science:

• Proteomics
• Analytical Chemistry
• Biochemistry

Background:

• Traditional bottom-up proteomics methods (peptide mass fingerprinting, peptide sequence tag) are time-consuming.
• These methods often fail to provide N-terminal sequence information.
• Characterizing post-translational modifications (PTMs) is challenging with current bottom-up strategies.

Purpose of the Study:

• To review the utility of in-source decay (ISD) in matrix-assisted laser desorption/ionization (MALDI) for proteomics.
• To explain the principle of ISD.
• To discuss the application of ISD for protein identification and sequence characterization.

Main Methods:

• In-source decay (ISD) technique within a MALDI source.
• Top-down proteomics strategy.
• Review of existing literature on ISD in proteomics.

Main Results:

• ISD provides N-terminal sequence information.
• ISD facilitates protein identification.
• ISD aids in the characterization of post-translational modifications (PTMs).

Conclusions:

• ISD is a valuable tool for "top-down" proteomics.
• ISD offers advantages over traditional "bottom-up" methods in terms of speed and information obtained.
• ISD enhances protein identification and PTM characterization in proteomic studies.