Natural (mostly)

Synthetic (mostly)

• Phosphorylation
  • Structure
  • MS Strategy
  • Links

   

• Methionine Oxidation
  • Structure
    
    
    
• Deamidation
  • Structure
  • MS Strategy
  • Monograph

   

• Glycosylation
  • Structure
  • MS Strategy

  
  

• Ubiquitination
  • Structure
  • MS Strategy

• Carbamylation
  • Reaction
  • Monograph

• S-Carboxymethylation
  • Structure
  • Tutorial
    
    
• Acetylation
  • Reaction
  • Monograph
    
    
    
• Methylation
  • Reaction
  • Monograph

Modification Databases

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• Delta Mass A Database of Protein Post Translational Modifications
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• 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)
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• UNIMOD  "Protein Modifications For Mass Spectrometry", A list of potential amino acid modifications and mass shifts.