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Locating and identifying posttranslational modifications by in-source decay during MALDI-TOF mass spectrometry
1Department of Biochemistry, University of Washington, Seattle 98195-7350, USA.
Protein Science : a Publication of the Protein Society
|December 14, 1999
Summary
This study introduces a new mass spectrometry method to pinpoint posttranslational modifications (PTMs) in proteins. The technique accurately identifies PTM locations and masses in peptides and proteins.
Area of Science:
- Proteomics
- Analytical Chemistry
- Biochemistry
Background:
- Posttranslational modifications (PTMs) are crucial for protein function.
- Accurate identification and localization of PTMs are essential in proteomics.
- Existing methods may have limitations in PTM site determination.
Purpose of the Study:
- To develop and validate a novel technique for identifying and locating PTMs in peptides and proteins.
- To demonstrate the application of this method using specific examples.
Main Methods:
- Utilized matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS).
- Employed in-source decay with delayed ion extraction to generate c(n) ion signals.
- Developed a semi-automated data analysis process for PTM identification.
Main Results:
- Successfully identified and located phosphorylation sites in seven synthetic peptides.
- Determined the precise location of the heme group and N,N,N-trimethyllysine in yeast cytochrome c.
- The method allows for the definition of PTM location and added mass.
Conclusions:
- The described technique provides a robust method for PTM identification and localization.
- This approach enhances the characterization of protein modifications.
- The semi-automated analysis and graphical display aid in PTM data interpretation.