Identification of oxidized methionine in peptides.
The positive- and negative-ion collision-induced dissociation spectra of peptides containing methionine, methionine sulphoxide and methionine sulphone have been studied. Characteristic fragmentations were identified and evaluated as possible indicators for the presence of oxidized methionine residues in peptides. It was found that the elimination of CH3SOH (-64 u) from [M + H]+ is unique for peptides that contain methionine sulphoxide. Sequence ions containing the oxidized methionine undergo the same elimination, allowing unambiguous sequence determination. Methionine sulphone exhibits an analogous elimination of CH3SO2H (-80 u) from the protonated molecule, but not from sequence ions.
Lagerwerf
F M
FM
Bijvoet Center for Biomolecular Research, Department of Mass Spectrometry, Utrecht University, The Netherlands.
van de Weert
M
M
Heerma
W
W
Haverkamp
J
J
D013058:Mass Spectrometry; D008715:Methionine / Q000031:analogs & derivatives / Q000737:chemistry*; D010084:Oxidation-Reduction; D010455:Peptides / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment
D010455:Peptides; C018332:methionine sulfone; D008715:Methionine; C013111:methionine sulfoxide