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Mapping protein surface accessibility via an electron transfer dissociation selectively cleavable hydrazone probe.

Lisa Vasicek1, John P O'Brien, Karen S Browning

  • 1Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, TX 78712, USA.

Molecular & Cellular Proteomics : MCP
|March 7, 2012
PubMed
Summary

A new reagent and mass spectrometry method simplify identifying modified surface residues on proteins. This technique enhances understanding of protein interactions and conformations for biological research.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Structural Biology

Background:

  • Protein surface residues are critical for molecular interactions.
  • Mass spectrometry with derivatization offers low-resolution structural insights.
  • Identifying modified peptides post-digestion is analytically challenging due to complexity and low abundance.

Purpose of the Study:

  • To develop a novel method for facile identification of all modified surface residues.
  • To improve the analysis of protein surface accessibility and conformation.

Main Methods:

  • Utilized a novel hydrazone reagent (NN) for derivatization of surface-accessible amino acid residues.
  • Employed electron transfer dissociation (ETD) with collision-induced dissociation (CID) for preferential cleavage and identification.
  • Analyzed modified peptides from enzymatically digested proteins using mass spectrometry.

Main Results:

  • The NN reagent enabled facile identification of all modified surface residues.
  • Demonstrated a correlation between protein reactivity and surface accessibility.
  • Successfully applied the method to wheat eIF4E and PARP-1 Domain C.

Conclusions:

  • The presented method significantly simplifies the identification of surface-modified peptides.
  • This approach provides valuable insights into protein surface characteristics and their functional implications.
  • The technique is effective for studying biologically active proteins.