Amino acid sequence prerequisites for the formation of cn ions
- 1 November 1993
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Society for Mass Spectrometry
- Vol. 4 (11) , 874-831
- https://doi.org/10.1016/1044-0305(93)87005-w
Abstract
Ammo acid sequence prerequisites are described for the formation of c, ions observed in high-energy collision-induced decomposition spectra of peptides. It is shown that the formation of cn ions is promoted by the nature of the amino acid C-terminal to the cleavage site. A propensity for cn cleavage preceding threonine, and to a lesser extent tryptophan, lysine, and serine, is demonstrated where fragmentation is directed N-terminally at these residues. In addition, the nature of the residue N-terminal to the cleavage site is shown to have little effect on cn ion formation. A mechanism for cn ion formation is proposed and its applicability to the results observed is discussed.Keywords
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