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Originally published In Press as doi:10.1074/mcp.M500163-MCP200 on August 27, 2005.
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Molecular & Cellular Proteomics 4:1910-1919, 2005.
© 2005 by The American Society for Biochemistry and Molecular Biology, Inc.

Research

Collisional Activation by MALDI Tandem Time-of-flight Mass Spectrometry Induces Intramolecular Migration of Amide Hydrogens in Protonated Peptides*

Thomas J. D. Jørgensen{ddagger},§,¶, Nicolai Bache{ddagger}, Peter Roepstorff{ddagger}, Henrik Gårdsvoll§ and Michael Ploug§

From the {ddagger} Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark and § Finsen Laboratory, Rigshospitalet, DK-2100 Copenhagen Ø, Denmark

Considerable controversy exists in the literature as to the occurrence of intramolecular migration of amide hydrogens upon collisional activation of protonated peptides and proteins. This phenomenon has important implications for the application of CID as an experimental tool to obtain site-specific information about the incorporation of deuterium into peptides and proteins in solution. Using a unique set of peptides with their carboxyl-terminal half labeled with deuterium we have shown unambiguously that hydrogen (1H/2H) scrambling is such a dominating factor during low energy collisional activation of doubly protonated peptides that the original regioselective deuterium pattern of these peptides is completely erased (Jørgensen, T. J. D., Gårdsvoll, H., Ploug, M., and Roepstorff, P. (2005) Intramolecular migration of amide hydrogens in protonated peptides upon collisional activation. J. Am. Chem. Soc.127, 2785–2793). Taking further advantage of this unique test system we have now investigated the influence of the charge state and collision energy on the occurrence of scrambling in protonated peptides. Our MALDI tandem time-of-flight experiments clearly demonstrate that complete positional randomization among all exchangeable sites (i.e. all N- and O-linked hydrogens) also occurs upon high energy collisional activation of singly protonated peptides. This intense proton/deuteron traffic precludes the use of MALDI tandem time-of-flight mass spectrometry to obtain reliable information on the specific incorporation pattern of deuterons obtained during exchange experiments in solution.

To whom correspondence should be addressed: Dept. of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark. Tel.: 45-6550-2414; Fax: 45-6550-2467; E-mail: tjdj{at}bmb.sdu.dk


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