cyclized residue
modified residue that can arise from different natural residues
2-pyrrolidone-5-carboxylic acid
112.04
112.11
A protein modification that effectively converts a source amino acid residue to 2-pyrrolidone-5-carboxylic acid.
C 5 H 6 N 1 O 2
From DeltaMass: Average Mass: -18 Average Mass Change: -18.01 References:The conversion of glutamic acid to pyroglutamic was reported for the beta-amiloid protein. Miller et al. Arch. Biochem. Biophy. (1993) 301, 41-52.
MOD:01048
N-term
PSI-MOD
PyrGlu
X