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ExMS: data analysis for HX-MS experiments.

Zhong-Yuan Kan1, Leland Mayne, Palaniappan Sevugan Chetty

  • 1Johnson Research Foundation, Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. kanz@mail.med.upenn.edu

Journal of the American Society for Mass Spectrometry
|September 29, 2011
PubMed
Summary
This summary is machine-generated.

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A new program, ExMS, efficiently processes complex mass spectrometry data to identify and characterize numerous overlapping peptide fragments. This advance overcomes limitations in hydrogen exchange-mass spectrometry (HX-MS) for studying protein structure and function.

Area of Science:

  • Biophysics
  • Analytical Chemistry
  • Computational Biology

Background:

  • Hydrogen exchange-mass spectrometry (HX-MS) is crucial for studying protein biophysical and functional properties.
  • Current HX-MS methods face limitations in analyzing complex datasets and identifying overlapping peptide fragments.
  • Previous work suggested analyzing numerous overlapping peptides can overcome these limitations.

Purpose of the Study:

  • To introduce ExMS, a novel computer program designed to overcome current limitations in HX-MS analysis.
  • To enable efficient processing and definitive identification/characterization of a large number of peptide fragments.
  • To facilitate the study of protein structural dynamics using HX-MS.

Main Methods:

  • ExMS program automatically processes high-resolution MS data to identify isotopic peaks and envelopes of peptides identified by MS/MS.

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  • The program incorporates tests to ensure correct peptide identification despite spectral overlap and potential multi-modal envelopes.
  • ExMS can process sequential HX time points automatically and rapidly (~2 sec/peptide/time point) on desktop computers, with options for manual review.

    • Main Results:

    • ExMS enables efficient processing of crowded mass spectra, crucial for analyzing large datasets of overlapping peptides.
    • The program accurately identifies and characterizes peptide fragments, addressing challenges posed by spectral overlap and heterogeneity.
    • Automated processing of multiple HX time points significantly accelerates data analysis.

    Conclusions:

    • ExMS significantly advances HX-MS capabilities by enabling efficient and accurate analysis of complex peptide data.
    • The program facilitates a more comprehensive understanding of protein biophysical and functional properties through detailed structural analysis.
    • ExMS is available as open-source software, promoting wider adoption and further research in protein dynamics.