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. 2011 Mar 23;286(20):17954–17967. doi: 10.1074/jbc.M111.229377

FIGURE 6.

FIGURE 6.

LTQ-FTICR MS analysis of the SUATM129 chymotrypsin peptide pair containing cysteine C1 and cysteines C17,18,19. A, full scan of the chymotrypsin digest of SUATM129 HPLC fraction 41 is shown with accurate mass measurement of the 3+ ion (z = 3) of the C1 and C17, C18, C19 peptide pair, mass = 694.92413. The actual isotopic distribution and the theoretical isotopic distribution of mass 694.92413 are shown as insets. B, LTQ-FTICR ECD MS analysis of mass 694.92413 corresponding to the 3+ ion of the SUATM129 chymotrypsin C1 and C17, C18, C19 disulfide-bonded peptide pair and each individual peptide 1+ ion from the parent. The isotopic distributions of the ECD C1 and C17, C18, C19 peptides are shown in insets.