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. 2006 Mar 20;103(13):4918–4923. doi: 10.1073/pnas.0507923103

Fig. 5.

Fig. 5.

Mass analysis of the pertactin 21-kDa stable core. (A) MALDI-TOF mass analysis of tryptic peptides from the pertactin 21-kDa stable core fragment. Peaks corresponding to identified tryptic peptides are labeled. No fragments >4,000 m/z were detected. (B) Locations of the tryptic peptides in the full-length pertactin sequence. All labeled peaks deviate less than ±2 Da from the calculated size. Residue numbering is taken from numbering in the PDB file (PDB ID code 1DAB). The upper bar shows the complete preprotein sequence from B. pertussis, including the N-terminal signal sequence, the flexible proline-rich repeat (PRR) at the C terminus of β-helix, and the C-terminal β-porin domain. The middle bar represents the mature β-helix domain used in this study, with labeled tryptic peptides magnified in the lower bar. Symbols correspond to labeled peaks in A.