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. 2011 Nov 23;287(2):1510–1519. doi: 10.1074/jbc.M111.285528

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© 2012 by The American Society for Biochemistry and Molecular Biology, Inc.

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FIGURE 4. — Alternative steps to identify disulfide linkages in the N-terminal domain of IGFBP-5. Analysis of N-terminal peptides generated by chymotrypsin (C). A, CID-MS2 (top) and ETD-MS2 (bottom) of precursor ion, m/z 599.8 (+4), identifying the disulfide-linkage between Cys⁴⁷ and Cys⁶⁰ in peptides C4 and C5, respectively. [M] denotes the parent mass. Ions marked with * are from C5; other ions are from C4. B, CID-MS2 of precursor ion, m/z 791.5 (+4) corresponding to peptides C1-C2-C3. Ions marked with ^ are from C2; other ions are from C1.