PSI-MOD browser

Search the PSI-MOD protein modification ontology by name, origin residue or delta mass, and follow parent/child terms. The data is the PSI-MOD release bundled with the psimodpy Python package; the page runs in your browser and sends nothing anywhere.

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Matches the ID, name, definition and synonyms (case-insensitive substring).

Delta-mass search

Signed mass shift, e.g. 79.9663 or -18.0106. Hits are sorted by |Δ error|, closest first; see Methods below.

Phosphorylation, +79.966331 Da ± 0.01 Da.

Terms

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Origin Δ formula Source Status
About this tool / Methods

Each row is one term of the PSI-MOD ontology (the PSI-MOD.obo release bundled with psimodpy, loaded with psimodpy.load(), obsolete terms included). Obsolete terms are hidden unless you change the Status filter.

  • Δ mass, mono: the monoisotopic mass difference of the modification (DiffMono in the OBO file, entry.diff_mono). Average: DiffAvg.
  • Δ formula: the difference formula (DiffFormula) in ProForma Hill notation (entry.proforma_formula).
  • Origin: the residue the modification occurs on; crosslinks list each site. Source: natural, artifact or hypothetical, as annotated in PSI-MOD.