Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2436.doi: 10.7503/cjcu20210004

• Analytical Chemistry • Previous Articles     Next Articles

193 nm UV Photodissociation Mass Spectrometry for Ubiquitin Ions with Different Charge States

ZHOU Min1,2, SHI Yingying2, LI Shuqi2, ZHANG Kailin2,3, CUI Yongliang2, ZHANG Sen2, ZHANG Xianyi1(), KONG Xianglei2,4()   

  1. 1.School of Physics and Electronic Information,Anhui Normal University,Wuhu 241000,China
    2.State Key Laboratory and Institute of Elemento?Organic Chemistry,Nankai University,Tianjin 300071,China
    3.School of Precision Instrument and Opto?Electronics Engineering,Tianjin University,Tianjin 300072,China
    4.Innovation Center of Chemical Science and Engineering,Nankai University,Tianjin 300071,China
  • Received:2021-01-04 Online:2021-08-10 Published:2021-03-24
  • Contact: ZHANG Xianyi E-mail:xyzhang@ahnu.edu.cn;kongxianglei@nku.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21627801)

Abstract:

In recent years, the application of ultraviolet photodissociation(UVPD) in protein top-down mass spectrometry has attracted more and more attentions. In this study, the UVPD mass spectra of ubiquitin ions with different charge states were studied by combining a 193 nm laser with a fourier transform ion cyclotron resonance(FT-ICR) mass spectrometer. Results showed that the efficiency of ion fragmentation and trapping could be improved by introducing an appropriate amount of collision gas into the analysis cell during photolysis. Compared with the pure b, y ions produced in collision-activated dissociation(CAD) experiments, UVPD method produced more abundant fragment ions in both intensity and diversity. For +11 ubiquitin ions, the protein sequence coverage was close to 80%, which was much higher than the corresponding experimental results of CAD. However, different from the previous reports, the fragmentation coverage still showed a correlation with the charge state of the ions. For the lower charged protein ions, further research for a better dissociation efficiency and sequence coverage is still needed very much.

Key words: Top-down, Ultraviolet photodissociation, Collision-activated dissociation, Ubiquitin, Charge state

CLC Number: 

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