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Artifacts and unassigned masses encountered in peptide mass mapping
Jonathan A Karty1, Marcia M E Ireland, Yves V Brun
1Department of Chemistry, Indiana University, Bloomington 47405, USA.
Summary
Uninterpreted mass spectral peaks in peptide mass mapping often stem from genomic errors, modifications, or contaminants. This study interprets these masses to reveal insights into protein analysis phenomena.
Area of Science:
- Proteomics
- Mass Spectrometry
- Molecular Biology
Background:
- Peptide mass mapping frequently yields uninterpreted mass spectral peaks, hindering comprehensive protein analysis.
- These unassigned masses can originate from various sources including genomic errors, post-translational modifications, and sample contaminants.
Purpose of the Study:
- To interpret unassigned mass spectral peaks encountered during peptide mass mapping.
- To elucidate phenomena influencing peptide mass mapping of electrophoretically separated proteins.
Main Methods:
- Analysis of mass spectral data from electrophoretically separated proteins.
- Investigating sources of uninterpreted mass peaks in proteomic studies.
Main Results:
- A significant proportion of observed masses in a Caulobacter crescentus stalk organelle study remained unassigned.
- Interpretation of these masses provided insights into common challenges in peptide mass mapping.
Conclusions:
- Interpreting unassigned masses is crucial for a complete understanding of proteomic samples.
- This work highlights the diverse origins of uninterpreted peaks and their implications for protein identification.