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The IonSource Guide To Protein Post-Translational Modifications





Natural (mostly)


Synthetic (mostly)




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Modification Databases


  • Delta Mass A Database of Protein Post Translational Modifications
  • RESID Database at the EBI "The RESID Database of Protein Modifications is a comprehensive collection of annotations and structures for protein modifications including amino-terminal, carboxyl-terminal and peptide chain cross-link post-translational modifications." (quote form the RESID site)
  • UNIMOD  "Protein Modifications For Mass Spectrometry", A list of potential amino acid modifications and mass shifts.

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