Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (12): 2704.doi: 10.7503/cjcu20130824

• Analytical Chemistry • Previous Articles     Next Articles

Novel Method for Identification of Protein Arginine-ADP-ribosylation Based on Chemical Derivatization and CID Fragmentation

ZHAO Zhi-Qiang1,2, QIU Hui-Hua1, YAO Jun1,2, CHEN Yong-Feng1   

  1. 1. Medical School, Taizhou 318000, China;
    2. Institute of Tumor, Taizhou University, Taizhou 318000, China
  • Received:2013-08-27 Online:2013-12-10 Published:2013-10-23

Abstract:

High performance liquid chromatography coupled to electrospray ionization mass spectrometry(MS) was widely used to map protein posttranslational modifications in complex biological samples. But frequently-used collision induced dissociation(CID) was unsuccessful in fragmentizing arginine adenosine diphosphate(ADP)-ribosylated peptides because the spectra from CID fragmentation were dominated by ADP-ribose fragment ions at the expense of the fragments generated from peptide backbone, making the assignment of the peptide sequence very difficult. In this work, a novel method was developed for identification of arginine ADP-ribosylated peptides based on CID fragmentation. Arginine ADP-ribosylated angiotensin-Ⅰ was either converted to ornithinylated angiotensin-Ⅰ under alkaline condition or hydrolyzed to arginine ribosylated angiotensin-Ⅰ by treatment with phosphodiesterase and alkaline phosphatase. The two derivatives were then subjected to CID fragmentation during tandem MS analysis. Compared with unmodified ADP-ribosylated angiotensin-Ⅰ, the two derivatives generated more sequence specific ions in the spectra, giving enough information to localize the site of arginine ADP-ribosylation.

Key words: Angiotensin-Ⅰ, Chemical derivatization, Collision induced dissociation, Mass spectrometry, Arginine adenosine diphosphate(ADP)-ribosylation

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