Characteristic fragment ions associated with dansyl cadaverine and biotin cadaverine adducts on glutamine


BİBEROĞLU K. , Schopfer L. M. , TACAL Ö. , Lockridge O.

ANALYTICAL BIOCHEMISTRY, vol.600, 2020 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 600
  • Publication Date: 2020
  • Doi Number: 10.1016/j.ab.2020.113718
  • Title of Journal : ANALYTICAL BIOCHEMISTRY
  • Keywords: Mass spectrometry, Protein prospector, Transglutaminase, Dansyl cadaverine, Biotin cadaverine, Casein, Butyrylcholinesterase, PROTEIN, TRANSGLUTAMINASE

Abstract

Glutamine residues susceptible to transglutaminase-catalyzed crosslinking can be identified by incorporation of dansyl cadaverine or biotin cadaverine. Bacterial transglutaminase and human transglutaminase 2 were used to modify residues in beta-casein with dansyl cadaverine. Bacterial transglutaminase was used to modify residues in human butyrylcholinesterase with biotin cadaverine. Tryptic peptides were analyzed by LC-MS/MS on an Orbitrap Fusion Lumos mass spectrometer. Modified residues were identified in Protein Prospector searches of mass spectrometry data. The MS/MS spectra from modified casein included intense peaks at 336.2, 402.2, and 447.2 for fragments of dansyl cadaverine adducts on glutamine. The MS/MS spectra from modified butyrylcholinesterase included intense peaks at 329.2, 395.2, and 440.2 for fragments of biotin cadaverine adducts on glutamine. No evidence for transglutaminase-catalyzed adducts on glutamic acid, aspartic acid, or asparagine was found. Consistent with expectation, it was concluded that bacterial transglutaminase and human transglutaminase 2 specifically modify glutamine. The characteristic ions associated with dansyl cadaverine and biotin cadaverine adducts on glutamine are useful markers for modified peptides.