Skip to main content
. Author manuscript; available in PMC: 2011 Jun 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2010 Feb 1;21(6):908–917. doi: 10.1016/j.jasms.2010.01.025

Table 1.

Human salivary Cystatins

Cystatin Swiss-
Prot		 #
amino
acids		 Modification Measured
average
mass (Da)		 Calculated
monoisotopic
mass after
modification
(Da)		 Experimental
monoisotopic
mass (FTMS)
(Da)		 Delta
(Da)		 Delta RMSa (ppm)(ppm)
S P01036 121 1-20 removed,
2 disulfide bonds		 14186 14175.8005 14175.8569 0.0564 3.98 3.69
S1 P01036 121 1-20 removed,
2 disulfide bonds,
phosphorylation		 14266 14255.7668 14255.8567 0.0899 6.30 4.26
S2 P01036 121 1-20 removed,
2 disulfide bonds,
2 phosphorylation		 14346 14335.7335 14335.8110 0.0775 5.40 4.75
SA P09228 121 1-20 removed,
2 disulfide bonds		 14347 14337.0014 14336.9856 0.0158 1.10 6.55
SN P01037 121 1-20 removed,
2 disulfide bonds		 14313 14303.2228 14303.1553 0.0675 4.72 5.00
SN
(SNP)		 P01037 121 1-20 removed,
2 disulfide bonds,
rs2070856 (P31L)		 14328 14319.1187 14319.171b 0.0523 3.65 b 7.07 b
C P01034 120 1-26 removed,
2 disulfide bonds		 13345 13334.5969 13334.5829 0.0140 1.05 3.90
D (SNP) P28325 114 1-28 removed,
2 disulfide bonds,
rs1799841 (C46R)		 13165 13154.4776 13154.4675 0.0101 0.77 2.47
D (SNP) P28325 118 1-24 removed,
2 disulfide bonds,
rs1799841 (C46R)		 NDc 13596.7064 13596.7015 0.0049 0.36 0.35
a

Root mean square of error on product ion assignments (within 10 ppm tolerance).

b

Values taken from reference 26.

c

Detected by FT-ICR-MS only