Table 1.

Cross sections of selected [Pep+2H]²⁺ palmitoylated peptide ions.

Peptide sequencea	# of residues	Unmodified peptide mass (Da)b	Unmodified peptide Ω (Å2)	Pal-peptide mass (Da)c	Pal-peptide Ω (Å2)	ΔΩ (Å)d	# of Pal group(s)	ΔΩ per Pal group (Å2)
CHDFR	5	676.28	185.4	914.51	239.3	53.9	1	53.9
MGCDR	5	580.21	173.7	818.44	217.7	44.0	1	44.0
MCILK	5	606.32	182.1	844.55	230.2	48.2	1	48.2
MACLK	5	564.28	179.3	802.50	218.0	38.7	1	38.7
CENLVK	6	704.35	192.6	942.58	242.9	50.3	1	50.3
MACLLR	6	705.37	203.8	943.59	248.2	44.4	1	44.4
HGCIVK	6	655.35	204.8	893.57	249.2	44.4	1	44.4
FCFPLK	6	753.39	219.9	991.61	262.4	42.5	1	42.5
VCHCLGK	7	758.36	199.8	1234.81	295.0	95.2	2	47.6
DFCFPLK	7	868.42	223.6	1106.64	267.0	43.4	1	43.4
MPLACLR	7	802.42	223.6	1040.64	262.3	38.7	1	38.7
MTVCGGK	7	694.31	182.2	1170.76	279.3	97.1	2	48.6
VGIHLCIK	8	881.52	228.5	1119.75	275.2	46.7	1	46.7
MPALACLR	8	873.46	228.3	1111.68	269.9	41.6	1	41.6
IPCCPVNLK	9	985.51	232.3	1461.96	323.1	90.7	2	45.4
VIEVVQGACR	10	1072.57	240.2	1310.80	290.5	50.3	1	50.3
IAFQELLCLR	10	1204.66	271.6	1442.89	315.6	44.0	1	44.0
					Average ΔΩ per Pal group:			45.5 ± 4.1

^aBold letters indicate palmitoylation sites.

^bPeptide masses are calculated from the molecular compositions.

^cPalmitoylated peptide masses are calculated from the molecular compositions. The number and location of the palmitoylation sites in the amino acid sequence are provided.

^dΔΩ is the change in cross section after palmitoylation, defined as: ΔΩ = Ω_{Pal peptide} − Ω_{unmodified peptide}