Assessment of resolution parameters for CID-based shotgun proteomic experiments on the LTQ-orbitrap mass spectrometer

Min Sik Kim, Kumaran Kandasamy, Raghothama Chaerkady, Akhilesh Pandey

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Shotgun proteomics has been used extensively for characterization of a number of proteomes. High-resolution Fourier transform mass spectrometry (FTMS) has emerged as a powerful tool owing to its high mass accuracy and resolving power. One of its major limitations, however, is that the confidence level of peptide identification and sensitivity cannot be maximized simultaneously. Although it is generally assumed that higher resolution is better for peptide identifications, the precise effect of varying resolution as a parameter on peptide identification has not yet been systematically evaluated. We used the Escherichia coli proteome and a standard 48 protein mix to study the effect of different resolution parameters on peptide identifications in the setting of a shotgun proteomics experiment on an LTQ-Orbitrap mass spectrometer. We observed a higher number of peptide-spectrum matches (PSMs) whenever the MS scan was carried out by FT and the MS/MS in the ion-trap (IT) with the maximum PSMs obtained at an MS resolution of 30,000. In contrast, when samples were analyzed by FT for both MS and MS/MS, the number of PSMs was significantly lower (~40% compared with FT-IT experiments) with the maximum PSMs obtained when both the MS and MS/MS resolution were set to 15,000. Thus, a 15K-15K resolution setting may provide the best compromise for studies where both speed and accuracy such as high-throughput post-translational analysis and de novo sequencing are important. We hope that our study will allow researchers to choose between different resolution parameters to achieve their desired results from proteomic analyses.

Original languageEnglish (US)
Pages (from-to)1606-1611
Number of pages6
JournalJournal of the American Society for Mass Spectrometry
Volume21
Issue number9
DOIs
StatePublished - Sep 1 2010
Externally publishedYes

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Firearms
Mass spectrometers
Proteomics
Peptides
Experiments
Proteome
Ions
Optical resolving power
Fourier Analysis
Escherichia coli
Mass spectrometry
Mass Spectrometry
Fourier transforms
Research Personnel
Throughput

ASJC Scopus subject areas

  • Structural Biology
  • Spectroscopy

Cite this

Assessment of resolution parameters for CID-based shotgun proteomic experiments on the LTQ-orbitrap mass spectrometer. / Kim, Min Sik; Kandasamy, Kumaran; Chaerkady, Raghothama; Pandey, Akhilesh.

In: Journal of the American Society for Mass Spectrometry, Vol. 21, No. 9, 01.09.2010, p. 1606-1611.

Research output: Contribution to journalArticle

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