NDLI: Optimized orbitrap HCD for quantitative analysis of phosphopeptides

Content Provider	Springer Nature Link
Author	Zhang, Yi Ficarro, Scott B. Li, Shaojuan Marto, Jarrod A.
Copyright Year	2009
Abstract	Despite the tremendous commercial success of radio frequency quadrupole ion traps for bottom-up proteomics studies, there is growing evidence that peptides decorated with labile post-translational modifications are less amenable to low-energy, resonate excitation MS/MS analysis. Moreover, multiplexed stable isotope reagents designed for MS/MS-based quantification of peptides rely on accurate and robust detection of low-mass fragments for all precursors. Collectively these observations suggest that beam-type or tandem in-space MS/MS measurements, such as that available on traditional triple quadrupole mass spectrometers, may provide beneficial figures of merit for quantitative proteomics analyses. The recent introduction of a multipole collision cell adjacent to an Orbitrap mass analyzer provides for higher energy collisionally activated dissociation (HCD) with efficient capture of fragment ions over a wide mass range. Here we describe optimization of various instrument and post-acquisition parameters that collectively provide for quantification of iTRAQ-labeled phosphorylated peptides isolated from complex cell lysates. Peptides spanning a concentration dynamic range of 100:1 are readily quantified. Our results indicate that appropriate parameterization of collision energy as a function of precursor m/z and z provides for optimal performance in terms of peptide identification and relative quantification by iTRAQ. Using this approach, we readily identify activated signaling pathways downstream of oncogenic mutants of Flt-3 kinase in a model system of human myeloid leukemia.
Starting Page	1425
Ending Page	1434
Page Count	10
File Format	PDF
ISSN	10440305
Journal	Journal of The American Society for Mass Spectrometry
Volume Number	20
Issue Number	8
e-ISSN	18791123
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-03-28
Publisher Institution	The American Society for Mass Spectrometry
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Biotechnology Organic Chemistry Proteomics Bioinformatics
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Structural Biology

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Optimized orbitrap HCD for quantitative analysis of phosphopeptides

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