Influence of Size on Apparent Scrambling of Sequence During CID of b-Type Ions

We investigated the influence of peptide size on the apparent loss of sequence during collision-induced dissociation (CID) of b ions using a group of peptides containing from between 4 and 10 residues. Although scrambling of sequence for b 3 + generated from tetrapeptides is minimal, significant for...

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Veröffentlicht in:Journal of the American Society for Mass Spectrometry 2009-11, Vol.20 (11), p.2174-2181
Hauptverfasser: Molesworth, Samuel, Osburn, Sandra, Van Stipdonk, Michael
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Osburn, Sandra
Van Stipdonk, Michael
description We investigated the influence of peptide size on the apparent loss of sequence during collision-induced dissociation (CID) of b ions using a group of peptides containing from between 4 and 10 residues. Although scrambling of sequence for b 3 + generated from tetrapeptides is minimal, significant formation of nondirect sequence ions (i.e., ions for which scrambling has apparently occurred) was observed for all larger b ions included in the study. Multiple-stage CID experiments demonstrate loss of internal residues and remarkable similarity of product ion spectra among b n ions from permuted sequence isomers. The results support the hypothesis that significant sequence scrambling can occur following fragmentation of b-type ions.
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subjects Amino Acid Sequence
Analytical Chemistry
Analytical, structural and metabolic biochemistry
Base Sequence
Bioinformatics
Biological and medical sciences
Biotechnology
Chemistry
Chemistry and Materials Science
Fundamental and applied biological sciences. Psychology
General aspects, investigation methods
Ions - classification
Isomerism
Mass spectrometry
Molecular Sequence Data
Molecular Structure
Oligopeptides - chemical synthesis
Oligopeptides - chemistry
Organic Chemistry
Peptides
Proteins
Proteomics
Residues
Spectrometry, Mass, Electrospray Ionization
title Influence of Size on Apparent Scrambling of Sequence During CID of b-Type Ions
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