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자료유형
학술저널
저자정보
Seung Koo Shin (Pohang University of Science and Technology) Hye-Joo Yoon (Pohang University of Science and Technology)
저널정보
한국질량분석학회 Mass Spectrometry Letters Mass Spectrometry Letters Vol.12 No.4
발행연도
2021.12
수록면
131 - 136 (6page)

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Collision-induced dissociation of peptides involves a series of proton-transfer reactions in the activated peptide. To adescribe the kinetics of energy-variable dissociation, we considered the heat capacity of the peptide and the Marcus-theory-type proton-transfer rate. The peptide ion was activated to the high internal energy states by collision with a target gas in the collision cell. The mobile proton in the activated peptide then migrated from the most stable site to the amide oxygen and subsequently to the amide nitrogen (N-protonated) of the peptide bond to be broken. The N-protonated intermediate proceeded to the productlike complex that dissociated to products. Previous studies have suggested that the proton-transfer equilibria in the activated peptide affect the dissociation kinetics. To take the extent of collisional activation into account, we assumed a soft-sphere collision model, where the relative collision energy was fully available to the internal excitation of a collision complex. In addition, we employed a Marcus-theory-type rate equation to account for the proton-transfer equilibria. Herein, we present results from the integrated thermochemical approach using a tryptic peptide of ubiquitin.

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Abstract
Introduction
Methods
Results and Discussion
Conclusions
References

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