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. Author manuscript; available in PMC: 2013 Dec 7.
Published in final edited form as: J Proteome Res. 2012 Nov 21;11(12):5712–5719. doi: 10.1021/pr300538f

Figure 2. MS/MS spectrum of CCT8 downPeptide.

Figure 2

MS/MS spectrum of glutaraldehyde modified downPeptide fragment MAKLLNQLR from gene CCT8 (id3545); the dnAUG maps 24 codons downstream of the annAUG. The methionine and lysine are both modified by glutaraldehydation (+68 Da). This spectrum has matches to many of the possible CID fragments (19 resolable 1+ ions out of 24; in addition, the b6 fragment was detected among the +2 charged ions *). Matched +1 ion peaks are labeled with designations (a, b and y ions labeled with green, red and blue respectively); the a1 ion (arrowhead) is sometimes enhanced with glutaraldehyde treatment (16).