Table II

List of modifications unique for E. coli samples shown in Fig. 6

Modification types are derived from UniMod (12).

PeakΔMElemental compositionModification typeAmino acid
A−17.026549−NH3Oxobutanoic acid from N-terminal ThrThr
Pyro-Glu from GlnGln
Pyruvic acid from N-terminal SerSer
S-Carbamoylmethylcysteine cyclization (N terminus)N terminus
B0.984016+ODeamidationAsn, Gln
−NH
C27.994915+COFormylationLys, Ser, Thr, N terminus
D31.989829+O2DihydroxyPro, Arg, Lys, Phe
E43.005814+CHNOCarbamylationLys, Arg, Cys, N terminus
F98.073165+C6H10OUnknownHis