Effect of peptide fragment size on the propensity of cyclization in collision-induced dissociation: oligoglycine b(2)-b(8)

Journal of the American Chemical Society
Xian ChenNick C Polfer

Abstract

The chemistry of peptide fragmentation by collision-induced dissociation (CID) is currently being reviewed, as a result of observations that the amino acid sequence of peptide fragments can change upon activation. This rearrangement mechanism is thought to be due to a head-to-tail cyclization reaction, where the N-terminal and C-terminal part of the fragment are fused into a macrocycle (= cyclic peptide) structure, thus "losing" the memory of the original sequence. We present a comprehensive study for a series of b fragment ions, from b(2) to b(8), based on the simplest amino acid residue glycine, to investigate the effect of peptide chain length on the appearance of macrocycle fragment structures. The CID product ions are structurally characterized with a range of gas-phase techniques, including isotope labeling, infrared photodissociation spectroscopy, gas-phase hydrogen/deuterium exchange (using CH(3)OD), and computational structure approaches. The combined insights from these results yield compelling evidence that smaller b(n) fragments (n = 2, 3) exclusively adopt oxazolone-type structures, whereas a mixture of oxazolone and macrocycle b fragment structures are formed for midsized b(n) fragments, where n = 4-7. As each of ...Continue Reading

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Citations

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