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Chiral Recognition of O-Phosphoserine by Mass Spectrometry
Giovanna Fago1, Antonello Filippi2, Anna Giardini1
1Dipartimento di Chimica Università degli Studi di Roma "La Sapienza" P.le A. Moro 5, 00185 Roma (Italy).
Abstract:
Identification and quantification of the enantiomeric excess of O-phosphoserine (OP Ser) residues from post-translational modified proteins is now possible by the application of a very reproducible and sensitive mass spectrometric method. This technique is based on the different mass-spectral fragmentation patterns of the diastereomeric cluster ions generated in water/methanol solutions of the analyte (OP SerD/L ) with a suitable chiral compound (OP ThrL ) by collision-induced dissociation (CID; see mass spectra).
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