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Protein Science (1)

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Locating and identifying posttranslational modifications by in-source decay during MALDI-TOF mass spectrometry
JOHN J. LENNON, KENNETH A. WALSH
Journal:

Protein Science / Volume 8 / Issue 11 / November 1999

Published online by Cambridge University Press:

07 March 2001, pp. 2487-2493

Print publication:

November 1999
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A technique is described for identifying and locating posttranslational modifications (PTMs) in peptides and proteins of known sequence by interpretation of cn ion signals generated by in-source decay during delayed ion extraction in matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Sites of phosphorylation in seven synthetic peptides were determined, as was the location of both the heme group and N,N,N-trimethyllysine in yeast cytochrome c. A semi-automated data analysis process facilitates the identification of segments of the sequence on each side of the PTM, permitting its placement at the junction of the segments and definition of the added mass. A graphical display facilitates illustration of both the location and mass of the PTM.