Mass Spectrometry of Putrescine, Spermidine, and Spermine Covalently Attached to Francisella tularensis Universal Stress Protein and Bovine Albumin

Table 5

Signature ions for polyamine adducts on glutamate, glutamine, and aspartate.

	Glutamate	Glutamine	Aspartate
Putrescine	200 (8), 172, 155 (10); 129 (8), 101, 84	200 (14), 172, 155 (7); 129 (2), 101, 84	186 (5), 158, 141 (4); 115, 67, 50
Spermidine	257, 229, 212; 186 (2), 158, 141	257, 229, 212 (1); 186 (1), 158, 141	243, 215, 198 (1); 172 144, 127
Spermine	314, 286, 269 (6); 240, 212, 195 (4)	314, 286, 269; 240, 212, 195	300 (1), 272 (2), 255; 226 (2), 198, 181

Observed ions are shown in bold font, while theoretical ions are shown in black. Numbers in brackets indicate the number of times the signature ion was observed.