N-terminal modification

Acetyl, formyl, [ac], [for]  

Aminooxyacetyl, [aoa]  

Azide, [N3]  

Pyroglutamate, [pyr]  

S-acetylthioacetate, [sata]  

Succinyl, [suc]  


C-terminal modification

Amide, [NH2]  

Alkylester, [COOMe], [COOEt]  

Cysteamide, [cya]  

Ethylenediamine, [ed]  

Hydroxysucinimide ester, [Osu]  

N-methylamide, [NHMe]  


Non-standard residues

Aminoisobutyric acid, [aib]  

Beta aspartic acid, [beta D]  

Beta homo amino acids, [beta homo-aa]  

Beta-alanine, [beta A]  

Citrullin, [cit]  

Cyclohexylalanine, [cha]  

D amino-acids, [d-aa]  

Dihydroxyphenylalanine, [dopa]  

Epsilon lysine, [epsilon K]  

Fluoro-, chloro-, bromo phenylalanine, [x-F]  

Fluoro-, chloro-, bromo tyrosine, [x-Y]  

Gamma glutamic acid [gamma E]  


Heavy isotope (13C, 15N) labeled amino-acids  

13C15N-K

13C15N-R

13C15N-A

13C15N-I

13C15N-L

13C15N-F
13C15N-P

13C15N-V


Hydroxyproline, [hyp]  

Methyl-, acetyl-lysine [meK], [acK]  

N-methyl amino-acids, [N-Me-aa]  

Norleucine, [nle]  

Pencillinamine, [pen]  

Phosphorylation [pS], [pT], [pY]  


Methyl amino acids
{Lys(Me)}
{Lys(Me2)}
{Lys(Me3)}
N-Methyl amino acid
{N-Me-Ala}
{N-Me-Phe}
{N-Me-Leu}
{N-Me-Ile}
{N-Me-Val}
{N-Me-Met}
{N-Me-Nle}
{N-Me-Nva}
{Sar}
{N-Me-Ser}
{N-Me-Tyr}
{N-Me-Thr}
{N-Me-Asp}
{N-Me-Glu}
N-Me-beta-Ala