Title

Electrospray tandem mass spectrometry of alkali metal-containing anionic complexes of tripeptide

Document Type

Article

Publication Date

1996

Publication Title

Journal of Mass Spectrometry

Volume

31

Issue

2

First Page

159

Last Page

168

Keywords

alkali metal, tripeptide, article, complex formation, controlled study, nonhuman, priority journal, protein analysis, protein structure, tandem mass spectrometry, technique, Amino Acid Sequence, Anions, Mass Spectrometry, Metals, Alkali, Molecular Sequence Data, Molecular Structure, Oligopeptides, Peptide Fragments

Abstract

Collision-induced dissociation mass spectra of alkali metal-containing anionic tripeptides are reported. Both N-terminal and C-terminal product ions were observed from the precursor ions [M-2H+X]- and [M-3H+2X]- where X stands for an alkali metal. The results are consistent with precursor ion structures in which an alkali metal ion is centrally located for bonding with the amino terminus, the amide nitrogen atoms, and an oxygen atom of the carboxylate terminus; the second alkali metal ion in [M-3H+2X]- is likely attached to the other oxygen atom of the carboxylate terminus.