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Evaluation of the internal temperatures of an 8.6 kDa protein cation exposed to a hot dispenser cathode employed in electron capture dissociation mass spectrometry
Author(s) -
Yim Yonghyeon,
Kim Byungjoo,
Ahn Seonghee,
So HunYoung,
Lee Sunyoung,
Oh Han Bin
Publication year - 2006
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.2533
Subject(s) - chemistry , cathode , fragmentation (computing) , electron capture dissociation , infrared multiphoton dissociation , dissociation (chemistry) , analytical chemistry (journal) , mass spectrometry , ion , infrared , irradiation , atomic physics , protein filament , electron , fourier transform ion cyclotron resonance , optics , chromatography , nuclear physics , biochemistry , physics , organic chemistry , computer science , operating system
The ‘ effective ’ internal temperature of an 8.6 kDa ubiquitin cation was estimated under electron capture dissociation (ECD) conditions, in which a dispenser cathode electron source was mounted just outside an ion cyclotron resonance (ICR) cell, i.e., axially displaced at a distance less than 1 cm from the rear trap plate of the ICR cell. In this ECD configuration, thermal activation of the molecular ions stored in the ICR cell was anticipated since the heated dispenser cathode (T cathode surface > 1000°C) emitted a large amount of (both visible and infrared) radiation as well as electrons. An evaluation of the internal temperature of ubiquitin 6+ and 7+ cations was made by comparing our ECD fragmentation patterns with those obtained by McLafferty et al . ( J. Am. Chem. Soc. 2002; 124: 6407) as a function of the ion temperature. In McLafferty's configuration, the heating (or thermal activation) effect of their filament source was minimal since the filament was displaced by a distance as far as 70 cm from their ICR cell. A careful comparison reveals that the fragmentation patterns obtained in this work are very similar to those previously measured at T ∼ 125°C. In terms of sequence coverage, our ECD configuration provides better results, and in particular without the aid of any other simultaneous activation method, such as thermal heating, infrared multiphoton irradiation, or collisional activation, except for the visible and infrared radiation from the heated cathode. Copyright © 2006 John Wiley & Sons, Ltd.