How do you designate phosphorylated amino acids and peptides?

Mar 16, 2021

As it is a side-chain modification, phophorylation is denoted in brackets:

Phosphotyrosine H-Tyr(PO3H2)-OH

A phosphopeptide Ac-Tyr(PO3H2)-Tyr(PO3H2)-Tyr(PO3H2)-Ile-Glu-OH

Our derivatives of phosphorylated amino acids are assembled in subfamilies to be found in the families Serine, Threonine, and Tyrosine. The one-letter code equivalents of these phosphorylated amino acids are pS, pT, and pY.