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. 2013 Aug 27;69(Pt 9):1052–1059. doi: 10.1107/S1744309113021490

Figure 5.

Figure 5

Mass-spectrometric analysis of crystal contents. (a) ESI ion trap mass spectrum of crystal form I of the HigBA2 complex. A first major peak at 11 566 Da corresponds to the mass of the HigA2 antitoxin within 1 Da experimental error. The second major peak corresponds to a mass of 15 039 Da, again within 1 Da experimental error of the theoretical mass of the HigB2 toxin. (b) Identical ESI ion trap mass spectrum for crystal form II. Note the different ratio of peak intensities suggesting a different stoichiometry of the complex and the presence of a peak at 13 897 Da corresponding to a putative HigB2 degradation product.