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. Author manuscript; available in PMC: 2007 Jan 12.
Published in final edited form as: J Biol Chem. 2006 Sep 12;281(45):34537–34548. doi: 10.1074/jbc.M606654200

TABLE 4.

Phosphopeptides identified by linear mode MALDI-MS from Fe(III)-nitrilotriacetic acid IMAC enrichment

MH+ IMACa MH+APb Sequence Number of phosphorylated residues
1674.45 1514.33 QIYLELGSPLASPK 2
1740.26 1580.30 RASSAAATSIDKEFK 2
1868.96 1708.50 RASSAAATSIDKEFKK 2
2103.94 1943.92 IDVSNDVHSLGNSDTESR 2
2259.97 2099.87 IDVSNDVHSLGNSDTESRR 2
2784.22 2623.95 NSETTGSLSPTESSTTTPP(OH)DSVEER 2
3340.01 3100.05 IDVSNDVHSLGNSDTESRREQSVNETGR 3
3791.26 3630.95 NVSGSTNNNEVLAASSDVENASDLVGSHSSSGSTPNK 2
3871.82 3630.95 NVSGSTNNNEVLAASSDVENASDLVGSHSSSGSTPNK 3
a

Protonated molecular mass of the phospho-form of peptide.

b

Protonated molecular mass of the dephosphorylated peptide.