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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: J Mass Spectrom. 2012 May;47(5):644–654. doi: 10.1002/jms.2959

Figure 7.

Figure 7

CID MS/MS spectra from an electrospray ionization LTQ/Orbitrap mass spectrometer obtained for the molecular ions from the branch peptides resulting from aspartic acid-only digestion of SUMO-conjugated proteins: (a) MS/MS spectrum of the +3 ion at m/z 1152.39 from SUMO-1 modified E2 25K, (b) MS/MS spectrum of the +4 ion at m/z 899.95 from di-SUMO-2 and (c) MS/MS spectrum of the +3 ion at m/z 1171.59 from di-SUMO-3. Fragment ions resulting from cleavage on the SUMO moiety are indicated with a prime.