Targeted tandem mass spectrometry for high-throughput comparative proteomics employing NanoLC-FTICR MS with external ion dissociation

J Am Soc Mass Spectrom. 2007 Jul;18(7):1332-43. doi: 10.1016/j.jasms.2007.04.011. Epub 2007 May 3.

Abstract

Targeted tandem mass spectrometry (MS/MS) is an attractive proteomic approach that allows selective identification of peptides exhibiting abundance differences, e.g., between culture conditions and/or diseased states. Herein, we report on a targeted LC-MS/MS capability realized with a hybrid quadrupole-7 tesla Fourier transform ion cyclotron resonance (FTICR) mass spectrometer that provides data-dependent ion selection, accumulation, and dissociation external to the ICR trap, and a control software that directs intelligent MS/MS target selection based on LC elution time and m/z ratio. We show that the continuous on-the-fly alignment of the LC elution time during the targeted LC-MS/MS experiment, combined with the high mass resolution of FTICR MS, is crucial for accurate selection of targets, whereas high mass measurement accuracy MS/MS data facilitate unambiguous peptide identifications. Identification of a subset of differentially abundant proteins from Shewanella oneidensis grown under suboxic versus aerobic conditions demonstrates the feasibility of such approach.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Chromatography, High Pressure Liquid / methods*
  • Microchemistry / methods*
  • Nanotechnology / methods*
  • Proteome / analysis
  • Proteome / chemistry*
  • Proteomics / methods*
  • Sensitivity and Specificity
  • Spectrometry, Mass, Electrospray Ionization / methods*
  • Spectroscopy, Fourier Transform Infrared / methods*

Substances

  • Proteome